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IDT821621
LONG HAUL SLIC
LONG HAUL SLIC IDT821621
Version December 18, 2002
2975 Stender Way, Santa Clara, California 95054 Telephone: (800) 345-7015 * * FAX: (408) 492-8674 Printed in U.S.A. (c) 2002 Integrated Device Technology, Inc.
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*Notice: The information in this document is subject to change without notice
December 18, 2002
IDT821621
LONG HAUL SLIC
DISCLAMER Integrated Device Technology, Inc. reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. IDT does not assume any responsibility for use of any circuitry described other than the circuitry embodied in an IDT product. The Company makes no representations that circuitry described herein is free from patent infringement or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent, patent rights or other rights, of Integrated Device Technology, Inc.
LIFE SUPPORT POLICY Integrated Device Technology's products are not authorized for use as critical components in life support devices or systems unless a specific written agreement pertaining to such intended use is executed between the manufacturer and an officer of IDT. 1. Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any components of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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*Notice: The information in this document is subject to change without notice
December 18, 2002
LONG HAUL SLIC
ADVANCE INFORMATION IDT821621
FEATURES
! ! ! ! ! ! ! ! ! ! ! !
DESCRIPTION
The IDT821621 is a long haul Subscriber Line Interface Circuit. It implements the basic telephone line interface functions such as battery feeding, impedance matching, off-hook detection and ring-trip detection. The IDT821621 allows battery feeding between -19 V and -58 V and has the capability for driving long loops. The architecture of operating the SLIC in different states according to different loop states minimizes the system power dissipation. This long haul SLIC is pin-to-pin compatible with AMD7920. It provides a cost-effective solution for PBX and Central Office applications.
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SLIC operating states: Active, Ringing, Standby and Disconnect Low Standby power consumption (35 mW) -19 V to -58 V battery operation On-hook transmission Two-wire impedance set by single external impedance Programmable constant-current feed Programmable loop-detect threshold Programmable ring-trip detect threshold +3.3 V / +5 V compatible power supply No -5 V supply required On-chip Thermal Management (TMG) Four on-chip relay drivers and relay snubbers, 1 ringing and 3 general purpose Package available: 32 pin PLCC
FUNCTIONAL BLOCK DIAGRAM
TMG
Relay Driver Relay Driver Relay Driver A (TIP) Ring Relay Driver HPA Digital Interface Two-Wire Interface Signal Transm ission HPB Off-hook Detector B (RING) Power Feed Controller DA DB VBAT BGND VCC
The IDT an the IDT logo are registered trademarks of Integrated Device Technology, Inc.
RYOUT3 RYOUT2 RYOUT1 RINGOUT D1 D2 D3 C1 C2 DET VTX RSN
RD RDC CAS Ring-trip Detector
VBREF
AGND
1
2002 Integrated Device Technology, Inc. *Notice: The information in this document is subject to change without notice
December 18, 2002
DSC-6225/-
Table of Contents
Features........................................................................................................................................................................................................................ 1 Description ................................................................................................................................................................................................................... 1 Functional Block Diagram .......................................................................................................................................................................................... 1 Pin Configuration......................................................................................................................................................................................................... 5 Pin Description ............................................................................................................................................................................................................ 6 Functional Description................................................................................................................................................................................................ 7 SLIC States Control .......................................................................................................................................................................................... 7 Off-hook Detector.............................................................................................................................................................................................. 7 Ring-trip Detector .............................................................................................................................................................................................. 7 Relay Drivers Control ........................................................................................................................................................................................ 8 DC Feeding ....................................................................................................................................................................................................... 8 Impedance Matching......................................................................................................................................................................................... 9 Receive Gain Setting ........................................................................................................................................................................................ 9 Thermal Management ....................................................................................................................................................................................... 9 DC Electrical Characteristics.................................................................................................................................................................................... 10 AC Electrical Characteristics.................................................................................................................................................................................... 11 Test Circuits ............................................................................................................................................................................................................... 15 Basic Application Circuit .......................................................................................................................................................................................... 18 Ordering Information................................................................................................................................................................................................. 19
Table of Contents
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December 18, 2002
List of Figures
Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Loop-Detect Threshold Setting .............................................................................................................................................................. 7 Ring-trip Detection ................................................................................................................................................................................ 8 Relay Drivers Schematic........................................................................................................................................................................ 8 DC Feeding Characteristics ................................................................................................................................................................... 8 DC Feed Programming Circuit............................................................................................................................................................... 8 Two-Wire AC Input Impedance Programming Network ....................................................................................................................... 11 Two-Wire Return Loss ......................................................................................................................................................................... 15 Longitudinal Balance............................................................................................................................................................................ 15 Four-Wire Longitudinal Signal Generation........................................................................................................................................... 16 Two-to-Four Wire Gain ........................................................................................................................................................................ 16 Four-to-Two Wire Gain and Four-to-Four Wire Gain ........................................................................................................................... 17 Loop Detector Switching ...................................................................................................................................................................... 17 Basic Application Circuit ...................................................................................................................................................................... 18
List of Figures
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December 18, 2002
List of Tables
Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 Table 17 Table 18 Pin Description....................................................................................................................................................................................... 6 SLIC Operating States ........................................................................................................................................................................... 7 Absolute Maximum Ratings ................................................................................................................................................................. 10 Recommended Operating Conditions.................................................................................................................................................. 10 Transmission Performance .................................................................................................................................................................. 11 Longitudinal Capability......................................................................................................................................................................... 11 Idle Channel Noise............................................................................................................................................................................... 12 Insertion Loss and Balance Return Loss Signal .................................................................................................................................. 12 Line Characteristics ............................................................................................................................................................................. 12 Power Supply Rejection Ratio (VRipple=100 mVrms), Active State.................................................................................................... 12 Power Dissipation ................................................................................................................................................................................ 13 Supply Currents, Battery = -48V .......................................................................................................................................................... 13 Receive Summing Node (RSN) ........................................................................................................................................................... 13 Logic Inputs (C2-C1 and D3-D1) ......................................................................................................................................................... 13 Logic Output (DET) .............................................................................................................................................................................. 13 Ring-trip Detector Input (DA, DB) ........................................................................................................................................................ 13 Loop Detector ...................................................................................................................................................................................... 14 Relay Driver Output (RINGOUT, RYOUT1, RYOUT2, RYOUT3) ........................................................................................................ 14
List of Tables
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*Notice: The information in this document is subject to change without notice
December 18, 2002
IDT821621
LONG HAUL SLIC
PIN CONFIGURATION
RINGOUT
B (RING)
RYOUT1
A (TIP) 31
BGND
VCC
4 RYOUT2 RYOUT3 TMG VBAT D2 D1 NC NC DET 5 6 7 8 9 10 11 12 13 14
3
2
1
32
DB 30 29 28 27 26 DA RD HPB HPA NC VTX VBREF RSN AGND 25 24 23 22 21 20 RDC
IDT821621
15
16
17
18
19
D3
C2
C1
NC
Pin Configuration
CAS
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*Notice: The information in this document is subject to change without notice
NC
December 18, 2002
IDT821621
LONG HAUL SLIC
PIN DESCRIPTION
Table 1 -- Pin Description
Pin Name AGND BGND VBAT VBREF VCC A (TIP) B (RING) HPA HPB DA DB RSN VTX C1 C2 D1 D2 D3 RYOUT1 RYOUT2 RYOUT3 RINGOUT Type Ground Ground Battery - Power I/O I/O Capacitor Capacitor Input Input Input Output Inputs PLCC Pin No. 21 1 8 23 2 31 32 26 27 29 30 22 24 16 15 10 9 14 4 5 6 3 Analog ground. Battery ground. Battery supply and connection to substrate. Battery reference pin. It should be connected to VBAT. +3.3 V / +5 V compatible power supply. Connection to the Tip wire of the subscriber loop. Connection to the Ring wire of the subscriber loop. A (TIP) side of high-pass filter capacitor. B (RING) side of high-pass filter capacitor. Negative input to ring-trip comparator. Positive input to ring-trip comparator. Receive summing node. Transmit output. SLIC state control. TTL compatible. C2 is MSB and C1 is LSB. Refer to Table 2 for details. Relay driver control. TTL compatible. D1, D2 and D3 control the relay drivers RYOUT1, RYOUT2 and RYOUT3 respectively. Logic low on D1 activates the RYOUT1 relay driver. Logic low on D2 activates the RYOUT2 relay driver. Logic low on D3 activates the RYOUT3 relay driver. Relay/switch driver. Open-collector driver with emitter internally connected to BGND. Relay/switch driver. Open-collector driver with emitter internally connected to BGND. Relay/switch driver. Open-collector driver with emitter internally connected to BGND. Ringing relay driver. Open-collector driver with emitter internally connected to BGND. Detector output. Open-collector with a built-in 15 k pull-up resistor. This output provides on-hook/off-hook status of the loop based on the selected operating state. Refer to Table 2 for details. The detected output will either be hook switch or ring-trip. Logic low indicates that a hook switch event or ring-trip event has been detected. Detect resistor. An external resistor connected to this pin is used to set the loop-detect threshold. DC feed resistor. The DC feed current is programmed by a network connected between this pin and RSN. Anti-saturation capacitor. An external capacitor is connected to this pin to filter battery voltage when operating in anti-saturation region. Thermal management. An external resistor is connected between this pin and VBAT to offload power from SLIC. No Connect. Description
Inputs
Output Output Output Output
DET
Output
13
RD RDC CAS TMG NC
- - Capacitor - -
28 20 17 7 11, 12, 18, 19, 25
Pin Description
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*Notice: The information in this document is subject to change without notice
December 18, 2002
IDT821621
LONG HAUL SLIC
FUNCTIONAL DESCRIPTION
The IDT821621 implements the basic telephone line interface functions. It provides many user programmable features including 2-wire impedance matching, loop-detect threshold and ring-trip threshold setting, constant current feeding, 4-wire to 2-wire gain setting, etc. The following sections describe these functions in detail.
OFF-HOOK DETECTOR
The off-hook detector monitors the hook switch of the loop during Active or Standby state. The output of the DET pin goes low when an off-hook event is detected. The loop-detect threshold is programmed by an external resistor RD, which is connected between the RD and AGND pins. See Figure 1 for details.
SLIC STATES CONTROL
The IDT821621 can be operated in Disconnect, Ringing, Active or Standby state. A combination of the control pins C2 and C1 select one of the possible four operating states. See Table 2 for details. The IDT821621 provides an off-hook detector and a ring-trip detector on chip to support the necessary signaling functions. The selection of the detectors is based on the SLIC operating state. The output of the detectors is reported through the DET pin. Once a hook switch event or ring-trip event occurs, the DET pin goes low. Table 2 -- SLIC Operating States
State 0 1 2 3
!
SLIC
C1 Digital Interface C2 DET AGND
A(TIP)
Control Pins C2 0 0 1 1 C1 0 1 0 1
Two-Wire Status Disconnect Ringing Active Standby
DET Output Ring-trip Detector Ring-trip Detector Off-hook Detector Off-hook Detector
B(RING)
Two-wire Interface
Off-hook Detector RD
RD
CD
Figure 1 Loop-Detect Threshold Setting The loop current threshold ION and IOFF are calculated by the following equations:
510 I ON = --------RD 415 I OFF = --------RD
Disconnect
When the SLIC is in Disconnect state, both the TIP and RING outputs are in high impedance condition. In this state, the off-hook detector is inoperative and the power dissipation reduces to the lowest. The Disconnect state is useful for out-of-service lines.
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The R-C network, formed by the capacitor CD and the resistor RD, determines the on-hook to off-hook time constant. The value of CD for a typical on-hook to off-hook time constant of 0.5 ms is calculated by:
0.5ms C D = ---------------RD
Ringing
When the SLIC is in Ringing state, the ring relay driver (RINGOUT) is activated and the TIP and RING outputs are in high impedance condition. The ringing source is connected by an external ring relay to the line. In Ringing state, the status of the ring-trip detector is reported by the DET pin.
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RING-TRIP DETECTOR
Figure 2 shows a general ringing circuit for the IDT821621. During Ringing state, the on-chip ring relay driver (RINGOUT) is activated and the ringing source is connected by the ring relay to the Tip and Ring lines through the resistors R1 and R2. The ring-trip detector monitors the loop status and reports it via the DET pin. When the loop goes off-hook, the bridging resistors RB1, RB2, R3 and R4, and the filter capacitors CRT1 and CRT2 cause the voltage on DB to go positive with respect to DA and the DET pin goes low. If RLMAX is the maximum line resistance to be detected as an offhook, the bridging resistors should be chosen as that:
R B2 ( R LMAX + R FEED ) R B1 ---------- = ---------- = ------------------------------------------------R LMAX R3 R4
Active
In Active state, the SLIC is fully functional. The standard battery convention applies. All signal transmission and loop supervision functions are active. The status of the off-hook detector is gated to the DET pin.
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Standby
In Standby state, most of the internal circuitry is powered down, resulting in low power dissipation. The off-hook detection function operates normally, but signal transmission is not enabled. This state allows for monitoring off-hook transitions while maintaining lowest possible power consumption.
Where: RFEED = R1 + R2 If the line resistance is less than RLMAX, it means that an off-hook event occurs, otherwise, the loop is in on-hook state.
Functional Description
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December 18, 2002
IDT821621
LONG HAUL SLIC
Ring Relay KR
SLIC
RINGOUT
60 Note 2 Note 3 VAB (volts)
Ringing Source
+ R2 R1
RB1 RB2 CRT2 R3 R4 KR RF RF CRT1 DB
DA
Note 1
0
A(TIP) B(RING)
IL (mA)
30
Tip Line KR Ring Line
Figure 4 DC Feeding Characteristics Notes:
1250 1. V AB = I L R L = ------------------------------------RL ,where R L = R L + 2R F
Figure 2 Ring-trip Detection
R DC1 + R DC2
RELAY DRIVERS CONTROL
The IDT821621 provides an on-chip ring relay driver (RINGOUT) to control the external ring relay. This ring relay driver is active only in Ringing state. It is an internal transistor with the emitter internally connected to BGND and the collector as the driver output (see Figure 3). During ringing, the ring relay driver is activated and the ringing source is connected by an external ring relay to the Tip and Ring lines through ring feed resistors. The IDT821621 also provides three additional relay drivers (RYOUT1, RYOUT2 and RYOUT3) on the chip. All of them are opencollector drivers with emitters internally connected to BGND. They allow for direct operation of external test relays. The digital pins D1 to D3 are used to control the relay drivers RYOUT1, RYOUT2 and RYOUT3 respectively. Logic low on D1 to D3 activates their respective relay drivers.
RYOUT1 RYOUT2 RYOUT3
DC1 DC2 2. VAB = 0.857 ( V BAT + 3.3 ) - I L ------------------------------------
R
+R 300
DC1 DC2 3. V AB = 0.857 ( V BAT + 1.2 ) - I L ------------------------------------
R
+R 300
The feed current is programmable. Two resistors RDC1 and RDC2, and a capacitor CDC form the network for programming the feed current. See Figure 5,
A(TIP) RSN a RL b B(RING) RDC IL RDC1
SLIC
RDC2 CDC
RINGOUT
BGND
BGND
Feed current is programmed by RDC1 and RDC2.
Figure 3 Relay Drivers Schematic
Figure 5 DC Feed Programming Circuit The feed current IFEED is calculated by the following equation:
1250 I FEED = -----------------------------------R DC1 + R DC2
DC FEEDING
The IDT821621 provides constant-current feeding as shown in Figure 4.
Functional Description
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*Notice: The information in this document is subject to change without notice
December 18, 2002
IDT821621
LONG HAUL SLIC
An external capacitor CCAS connected to the CAS pin is used to filter noise that may originate from the battery source and prevent the output amplifiers from saturating. The value of this anti-saturation capacitor is calculated by the equation below:
1 C CAS = ---------------------------5 1.7 * 10 f C
THERMAL MANAGEMENT
The IDT821621 uses a power management technique of offloading the thermal energy from the SLIC to an external resistor RTMG. RTMG is connected between the TMG and VBAT pins as shown in Figure 13. This resistor shares some of the loop current and limits the on-chip power dissipation in Active state. The selection of RTMG normally needs to satisfy the following condition: with the programmed loop current being fed into a short circuit loop from the nominal battery, all of the loop current is supplied by RTMG. So, RTMG can be calculated by the equation below:
V BAT - 8V R TMG -------------------------- - 70 I
LOOP
Where, fC is the desired filter cut-off frequency.
IMPEDANCE MATCHING
The two-wire AC input impedance R2WIN is programmed by means of an external impedance (RT) connected between the RSN and VTX pins (see Figure 13). RT is calculated by the following equation:
R T = 250 ( R 2WIN - 2R F )
The power dissipated in the resistor RTMG during Active state is:
P RTMG ( V BAT - 8V - ( I L * R L ) ) = ----------------------------------------------------------- * R TMG 2 ( R TMG + 70 )
2
Where, RF is the value of the fuse resistor. Note that when computing RT, the internal current amplifier pole and any external stray capacitance between the RSN and VTX pins must be taken into account.
The power dissipated in the SLIC during Active state is:
P SLIC = V BAT * I L - P RTMG - R L ( I L ) + 0.12W
2
RECEIVE GAIN SETTING
The 4-wire to 2-wire gain (G42L) is defined as the receive gain. It is calculated by the following equation:
500R T RL G 42L = ----------- * -------------------------------------------------------R RX R T + 250 ( R L + 2R F )
Where, RL is the terminating impedance; RRX is connected between VRX and RSN; RT is defined above; RF is the fuse resistor. See Figure 11 for details.
Functional Description
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*Notice: The information in this document is subject to change without notice
December 18, 2002
IDT821621
LONG HAUL SLIC
DC ELECTRICAL CHARACTERISTICS
Table 3 -- Absolute Maximum Ratings
Rating Power Supply Voltage VCC Battery Voltage VBAT Voltage on Any Pin with Respect to Ground (Low Voltage Portion) Voltage on Any Pin with Respect to Ground (High Voltage Portion) Package Power Dissipation Storage Temperature Com'l & Ind'l -0.4 to +7 0.4 to -70 -0.4 to VCC+0.4 +1 to VBAT 1.7 -65 to +150 Unit V V V V W C
Note: Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Table 4 -- Recommended Operating Conditions
Parameters Ambient Temperature Power Supply Voltage VCC +3.3 V nominal +5 V nominal Battery Voltage VBAT Min. -40 3.15 4.75 -58 Max. +85 3.45 5.25 -19 Unit C V V V
DC Electrical Characteristics
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December 18, 2002
IDT821621
LONG HAUL SLIC
AC ELECTRICAL CHARACTERISTICS
Unless otherwise stated, test conditions are VBAT = -52 V, VCC = +5 V, RL= 600 , RDC1 = RDC2 = 27.17 k, RTMG = 2350 , RD = 35.4 k, no fuse resistors, CHP = 0.22 F, CDC = 0.1 F, CCAS = 0.33 F, D1 = 1N400x, 2-wire AC input impedance is a 600 resistance synthesized by the programming network as shown below.
VTX RT1 = 75 k
RT2 = 75 k
CT1 = 120 pF
RSN RRX = 150 k VRX
Figure 6 Two-Wire AC Input Impedance Programming Network
Table 5 -- Transmission Performance
Description 2-wire Return Loss Analog Output VTX Impedance Analog Output VTX Offset Voltage Overload Level, 2-wire and 4-wire Overload Level THD, Total Harmonic Distortion THD, On-hook Active state On-hook, RLAC = 600 0 dBm +7 dBm 0 dBm, RLAC = 600 -50 2.5 0.77 -64 -55 -50 -40 -36 dB Test Conditions (See Figure 7) 200 Hz to 3.4 kHz Min. 26 3 20 +50 Typ. Max. Unit dB mV Vpk Vrms Note
Table 6 -- Longitudinal Capability
Description Test Conditions (See Figure 8, Figure 9) 200 Hz to 1 kHz 0 to 70 C -40 to +85 C 1 kHz to 3.4 kHz 0 to 70 C -40 to +85 C 200 Hz to 3.4 kHz Active state 0 to 100 HZ Min. 63 58 dB 58 53 40 20 27 25 35 mArms /pin Typ. Max. Unit Note
Longitudinal to metallic L-T, L-4 balance
Longitudinal Signal Generation 4-L Longitudinal Current per pin Longitudinal Impedance at A or B
AC Electrical Characteristics
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December 18, 2002
IDT821621
LONG HAUL SLIC
Table 7 -- Idle Channel Noise
Description C-message Weighted Noise Psophometric Weighted Noise RL = 600 RL = 600 RL = 600 RL = 600 Test Conditions 0 to 70C -40 to +85C 0 to 70C -40 to +85C Min. Typ. 7 -83 Max. +10 +12 -80 -78 Unit dBrnc dBmp Note
Table 8 -- Insertion Loss and Balance Return Loss Signal
Description Gain Accuracy, 4- to 2-wire Gain Accuracy, 2- to 4-wire, 4- to 4-wire Gain Accuracy, 4- to 2-wire Gain Accuracy, 2- to 4-wire, 4- to 4-wire Gain Accuracy Over Frequency Gain Tracking Gain Tracking, On-hook Group Delay Test Conditions (See Figure 10, Figure 11) 0 dBm, 1 kHz 0 dBm, 1 kHz On-hook On-hook 300 to 3.4 kHz, relative to 1 kHz +3 dBm to -55 dBm, relative to 0 dBm 0 dBm to -37 dBm +3 dBm to 0 dBm 0 dBm, 1 kHz Min. -0.20 -6.22 -0.35 -6.37 -0.15 -0.15 -0.15 -0.35 4 -6.02 -6.02 Typ. Max. +0.20 -5.82 +0.35 5.67 +0.15 +0.15 +0.15 +0.35 s dB Unit Note
Table 9 -- Line Characteristics
Description IL, Short Loops, Active State IL, Long Loops, Active State RLDC = 600 RLDC = 1930 , VBAT = -42.75 V, TA = 25 C VBAT - 3V I L = ----------------------------------R L + 200 TA = 25 C Test Conditions Min. 20 18 0.7IL 18 Typ. 23 19 IL 30 100 65 -42.75 -44 A mA V 1.3IL mA Max. 26 Unit Note
IL, Accuracy, Standby State
Constant-current region IL, Loop Current, Disconnect State IL LIM VAB, Open Circuit Voltage RL = 0 Active, A and B to ground VBAT = -52 V
Table 10 -- Power Supply Rejection Ratio (VRipple=100 mVrms), Active State
Description VCC VBAT Effective Internal Resistance Test Conditions 50 Hz to 3.4 kHz 50 Hz to 3.4 kHz CAS pin to VBAT Min. 30 28 Typ. 40 50 335 Max. Unit dB k Note
AC Electrical Characteristics
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December 18, 2002
IDT821621
LONG HAUL SLIC
Table 11 -- Power Dissipation
Description On-hook, Disconnect State On-hook, Standby State On-hook, Active State Off-hook, Standby State Off-hook, Active State RL = 600 RL = 300 , RTMG = 2350 Test Conditions Min. Typ. 18 32 210 930 760 Max. 70 100 270 1200 900 mW Unit Note
Table 12 -- Supply Currents, Battery = -48V
Description ICC, On-hook VCC Supply Current Test Conditions Disconnect state Standby state Active state Disconnect state Standby state Active state Min. Typ. 2.6 1.9 4.3 0.25 0.55 3.8 Max. 4.0 4.0 8.5 1.0 1.5 4.8 Unit Note
mA
IBAT, On-hook VBAT Supply Current
Table 13 -- Receive Summing Node (RSN)
Description RSN DC Voltage RSN Impedance IRSN = 0 mA 200 Hz to 3.4 kHz Test Conditions Min. Typ. 0 10 20 Max. Unit V Note
Table 14 -- Logic Inputs (C2-C1 and D3-D1)
Description VIH, Input High Voltage VIL, Input Low Voltage IIH, Input High Current IIL, Input Low Current -75 -400 Test Conditions Min. 2.0 0.8 40 Typ. Max. Unit V Note
A
Table 15 -- Logic Output (DET)
Description VOL, Output Low Voltage VOH, Output High Voltage Test Conditions IOUT = 0.3 mA, 15 k to VCC IOUT = -0.1 mA, 15 k to VCC 2.4 Min. Typ. Max. 0.4 V Unit Note
Table 16 -- Ring-trip Detector Input (DA, DB)
Description Bias Current Offset Voltage AC Electrical Characteristics Source Resistance = 2 M 13
*Notice: The information in this document is subject to change without notice
Test Conditions
Min. -500 -50
Typ. -50 0
Max.
Unit nA
Note
+50
mV December 18, 2002
IDT821621
LONG HAUL SLIC
Table 17 -- Loop Detector
Description On Threshold Off Threshold Hysteresis Test Conditions (See Figure 12) RD = 35.4 K RD = 35.4 K RD = 35.4 K Min. 11.5 9.4 0 Typ. Max. 17.3 14.1 4.4 mA Unit Note
Table 18 -- Relay Driver Output (RINGOUT, RYOUT1, RYOUT2, RYOUT3)
Description On Voltage Off Leakage Zener Breakover Zener On Voltage IOL = 40 mA VOH = +5 V IZ = 100 A IZ = 30 mA 9.4 10 Test Conditions Min. Typ. +0.3 Max. +0.7 100 Unit V A V Note
AC Electrical Characteristics
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*Notice: The information in this document is subject to change without notice
December 18, 2002
IDT821621
LONG HAUL SLIC
TEST CIRCUITS
ZD A (TIP) VTX RT1 CT1 VS VM
R
SLIC AGND
RT2 B (RING) RSN RRX
R
ZD: The desired impedance (e.g., the characteristic impedance of the line)
Return Loss = -20 log (2 V M / V S)
Figure 7 Two-Wire Return Loss
A (TIP) 1 << RL 2fC C V AB RL 2
VTX
SLIC AGND
RT
VL
RL 2 B (RING) RSN
AB /
Longitudinal to Two-Wire Balance = 20 log (V
V L)
Longitudinal to Four-Wire Balance = 20 log (VTX / V L )
Figure 8 Longitudinal Balance
Test Circuits
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*Notice: The information in this document is subject to change without notice
December 18, 2002
IDT821621
LONG HAUL SLIC
A (TIP) RL 2 VL RL 2 B (RING)
VTX
SLIC AGND
RT
RSN
RRX VRX
4-L Long. Sig. Gen. = 20 log (V L / VRX)
Figure 9 Four-Wire Longitudinal Signal Generation
A (TIP) RL 2 VL RL 2 B (RING) VAB
VTX
SLIC AGND
RT
RSN
RRX
Gain 2-4 = 20 log (VTX / V AB)
Figure 10 Two-to-Four Wire Gain
Test Circuits
16
*Notice: The information in this document is subject to change without notice
December 18, 2002
IDT821621
LONG HAUL SLIC
A (TIP)
VTX
RL
VAB
SLIC AGND
RT
B (RING)
RSN
RRX VRX
Gain 4-2 = 20 log (V AB / V RX) Gain 4-4 = 20 log (VTX / V RX)
Figure 11 Four-to-Two Wire Gain and Four-to-Four Wire Gain
VCC 6.2 k
A (TIP)
DET 15 pF
RL
SLIC
B (RING)
Figure 12 Loop Detector Switching
Test Circuits
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*Notice: The information in this document is subject to change without notice
December 18, 2002
IDT821621
LONG HAUL SLIC
BASIC APPLICATION CIRCUIT
Ring Relay KR RB1 RB2 R2 R1 CRT2 R3 R4 KR RF 2.2 nF CRT1
IDT821621
RINGOUT
Ringing Source
+ -
DA VCC DB
+5 V
RD
CD
Tip Line
KR
A (TIP) HPA HPB B (RING)
RD VTX
RT VTX
CHP RF 2.2 nF
Ring Line
RSN
RDC2
RRX VRX
RYOUT1 RYOUT2 RYOUT3 BGND VBREF
BAT D1 RTMG
RDC1
RDC
CDC
AGND D3 D2 D1 C2 C1 DET
VBAT TMG
CAS
CCAS
Figure 13 Basic Application Circuit
Basic Application Circuit
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*Notice: The information in this document is subject to change without notice
December 18, 2002
IDT821621
LONG HAUL SLIC
ORDERING INFORMATION
IDT XXXXXX Dev ice Ty pe X Package X Process/ Temperature Range
Blank
Industrial (-40 C to +85 C)
J
Plastic Leaded Chip Carrier (PLCC, PL32)
821621
Long Haul SLIC
CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054
for SALES: 800-345-7015 or 408-727-5116 fax: 408-492-8674 www.idt.com
for Tech Support: 408-330-1753 email:TELECOMhelp@idt.com
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
Ordering Information
19
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December 18, 2002

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