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SP3244E-SP3245E
3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
* Contains 3-Drivers and 5-Receivers; Single-chip DTE (PC or terminal) serial port transceiver * Auto On-line(R) Plus * SP3244E slew-controlled to 250Kbps under load * SP3245E 1Mbps data rate for high-speed RS-232 * Meets true EIA/TIA-232-F and ITU V.28 standards from a +3.0V to +5.5V power supply * Adheres to EIA/TIA-562 for interoperability with EIA/TIA-232 down to a +2.7V supply voltage * Regulated charge pump yields stable RS-232 outputs regardless of VCC variations * ESD Specifications: 15KV Human Body Model 15KV IEC1000-4-2 Air Discharge 8KV IEC1000-4-2 Contact Discharge
FEATURES
C2+ 1 C2- 2 V- 3 R1IN 4
28 C1+ 27 V+ 26 VCC 25 GND
24 C1R2IN 5 R3IN 6 SP3244E 23 ONLINE SP3245E 22 SHUTDOWN R4IN 7 21 STATUS R5IN 8 T1OUT 9 T2OUT 10 T3OUT 11 T3IN 12 T2IN 13 T1IN 14 20 R2OUT 19 R1OUT 18 R2OUT 17 R3OUT 16 R4OUT 15 R5OUT
APPLICATIONS
* Portable RS-232 * Laptops and handheld PCs and PDA * Cellular telephones, datacables, chargingcradles * Diagnostic/upload ports on embedded applications * Use in conjunction with low-voltage UART or microcontroller * SP3244E is cross-compatible with MAX3244E, ICL3244E * SP3245E is cross-compatible with MAX3245E, ICL3245E
The SP3244E/3245E is a 3-driver/5-receiver device ideal for mobile phone, consumer and PDA applications. These devices use an internal high-efficiency, charge-pump power supply that requires only 0.1F capacitors for 3.3V single-supply operation. This charge pump and Sipex's driver architecture allow the SP3244E/3245E to deliver compliant RS-232 performance from a power supply ranging from +3.0V to +5.5V. At voltages between +2.7V and +3.0V the driver outputs are compliant with RS-562 and can interface to RS-232 in portable applications. The Auto On-line(R) Plus feature allows the device to automatically enter a low power shutdown mode if all receiver and driver inputs have been idle for 30 seconds. The device will "wake-up" from this automatic shutdown state upon detecting activity. This power saving feature functions without system intervention or modifications to software or drivers. SP3244E supports serial data rates of 250kbps minimum under full load and while maintaining slew rates of less than 30V/s. SP3245E is capable of high speed communication of up to 1Mbps.
Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus (c) Copyright 2006 Sipex Corporation
DESCRIPTION
1
PIN ASSIGNMENTS
NAME C2+ C2VR1IN R2IN R3IN R4IN R5IN T1OUT T2OUT T3OUT T3IN T2IN T1IN R5OUT R4OUT R3OUT R2OUT R1OUT
FUNCTION Positive terminal of the inverting charge pump capacitor. Negative terminal of the inverting charge pump capacitor. Regulated -5.5V output generated by the charge pump. RS-232 receiver input. RS-232 receiver input. RS-232 receiver input. RS-232 receiver input. RS-232 receiver input. RS-232 driver output. RS-232 driver output. RS-232 driver output. TTL/CMOS driver input. TTL/CMOS driver input. TTL/CMOS driver input. TTL/CMOS receiver output. TTL/CMOS receiver output. TTL/CMOS receiver output. TTL/CMOS receiver output. TTL/CMOS receiver output. Non-inverting receiver 2 output; active in shutdown. Status output. Forced SHUTDOWN input. Drive low to shut down drivers, receivers and charge pump. Will override Auto On-line(R) Plus. Do not leave this pin open. Auto On-line(R) input. Active low enabled automatic power saving feature. Equivalent to competitor's FORCEON pin. Do not leave this pin open. Negative terminal of the voltage doubler charge pump capacitor. Ground connection. Device power supply pin (3.0V to 5.5V). Regulated +5.5V output generated by the charge pump. Positive terminal of the voltage doubler charge pump capacitor.
PIN NUMBER (T)SSOP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 QFN 29 30 31 1 2 3 4 5 6 7 8 10 11 12 13 14 15 17 18 19 20 21
R2OUT STATUS SHUTDOWN
ONLINE
C1GND VCC V+ C1+
23 24 25 26 27 28
22 23 24 26 27 28
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
2
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (Vcc).......................-0.3V to + 6.0V V+ (Note 1)......................................-0.3V to + 7.0V V- (Note 1).......................................+0.3V to - 7.0V |V+| + |V-| .......................................................+13V Input voltage at TTL input pin.. -0.3V toVCC +0.3V RxIN..............................................................+/-18V Driver output (from Ground)...................... +/-13.2V RxOUT, STATUS.....................-0.3V to VCC + 0.3V Short Circuit Duration, TxOUT to GND, Continuous (One output at a time maximum) Storage Temperature.....................-65C to +150C Operating Temperature SP324XECX................0C to +70C Operating Temperature SP324XEEX...........-40C to +85C Lead Temperature (soldering, 10s)..............+300C SSOP-28, oJA = 67.1C/W TSSOP-28, oJA = 83.6C/W QFN- 32, oJA= 22.4C/W These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. NOTE 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
Unless otherwise noted VCC = +3.0V to +5.5V, TAMB = TMIN to TMAX, C1-C4 = 0.1F. Typical values are at TAMB = +25C, VCC = 3.3V.
PARAMETERS DC CHARACTERISTICS Supply Current, Auto On-Line(R) Plus Supply Current, Shutdown Supply Current, Active Driver Input and Logic Input Pins: High Low Logic Threshold Logic Input Leakage Current Logic Input Hysteresis VIH VIL VT IIL VHYS Vcc = 3.3V Vcc = 5.0V ICC3 ICC2 ICC1 Receivers idle, TxIN = Vcc or GND, ONLINE = GND, SHUTDOWN = Vcc Note 1 SHUTDOWN = GND ONLINE = SHUTDOWN = Vcc, No Load SYMB TEST CONDITIONS
ELECTRICAL CHARACTERISTICS
MIN. TYP. MAX. UNIT
1 1 1
10 10 5
A A mA
2 2.4 0.8 1.5 0.01 100 1.0 A mV V
Logic Input Voltage
Receiver Outputs and STATUS Output Receiver Output Voltage Low Receiver Output Voltage High Receiver Output Leakage Current Note 1: Characterized, not 100% tested. VOL VOH IOZ IOUT = -1.6mA IOUT = 1mA Receivers disabled. 0.4V < VO < 5.5V VCC -0.6 0.02 1 0.4 V V A
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
3
Unless otherwise noted VCC = +3.0V to +5.5V, TAMB = TMIN to TMAX, C1-C4 = 0.1F. Typical values are at TAMB = +25C, VCC = 3.3V.
PARAMETERS Receiver Inputs Input Voltage Range Input Threshold Low VCC = 3.3V VCC = 5.0V Input Threshold High VCC = 3.3V VCC = 5.0V Input Hysteresis Input Resistance Driver Outputs Output Voltage Swing VO All transmitter outputs loaded with 3k to GND Output load = Open Circuit Short Circuit Current Power-Off Impedance Output Leakage Current Mouse Drivability Vout = 0V VCC = V+ = V- = 0, transmitter outputs = 2V VCC = 0 or 3V to 3.3V, VOUT = 12V, Drivers disabled T1IN = T2IN = GND, T3IN = VCC, T3 loaded with 3k to GND, T1OUT and T2OUT loaded with 2.5mA each TA = 25C 3 SYMB TEST CONDITIONS
ELECTRICAL CHARACTERISTICS
MIN. TYP. MAX. UNIT
-15 0.6 0.8 1.0 1.2 1.2 1.7 200 4.5
+15
V V
2.4 2.4
V V mV
7
k
5.0
5.6 15.0 60
V
mA
300
10M 25
A
5.0
V
ESD Protection IEC 1000-4-2 Air Discharge ESD Protection for RxIn, TxOut pins IEC 1000-4-2 Contact Discharge Human Body Model All Other Pins Human Body Model 15 8 15 2 kV kV
Auto On-line(R) Plus (ONLINE = GND, SHUTDOWN = Vcc) Rx Input Threshold to STATUS Output High Rx Input Threshold to STATUS Output Low Threshold to STATUS High Threshold to STATUS Low Rx or Tx Transition to Drivers Enabled Last Rx or Tx Transition to Drivers Disabled tSTH tSTL tONLINE tOFFLINE Note 1 0.3 0.4 30 100 15 30 60 2.7 V V s s s sec
Note 1: Characterized, not 100% tested.
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
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Unless otherwise noted VCC = +3.0V to +5.5V, TAMB = TMIN to TMAX, C1-C4 = 0.1F. Typical values are at TAMB = +25C, VCC = 3.3V.
PARAMETERS SP3244E Maximum Data Rate Driver Propagation Delay Transition-Region Slew Rate tDPHL, tDPLH RL = 3k, CL = 1000pF. One transmitter switching. CL=1000pF RL=3k to 7k, CL=150pF to 1000pF, measurements taken from +3V to -3V or from -3V to +3V. |tDPHL - tDPLH| at zero crossing tRPHL,tRPLH tRZH , tRZL tRZH , tRLZ |tPHL - tPLH| at 1.5V RIN to ROUT, CL = 150pF 250 1600 kbps ns SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
TIMING CHARACTERISTICS
4
30
V/s
Driver Skew Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Receiver Skew SP3245E Maximum Data Rate
50 0.15 0.04 0.1 40 2.0 2.0
ns s s s ns
RL = 3k, CL = 250pF. One transmitter switching. RL = 3k, CL = 1000pF. One transmitter switching.
1000 500 700 24 100 0.15 0.05 0.1 2.0 2.0 150
kbps kbps ns V/s ns s s s ns
Driver Propagation Delay Transition-Region Slew Rate
tDPHL, tDPLH
CL=250pF RL=3k to 7k, CL=150pF to 250pF, measurements taken from +3V to -3V or from -3V to +3V. |tDHPL - tDPLH| at zero crossing
Driver Skew Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Receiver Skew tRPHL,tRPLH tRZH , tRZL tRZH , tRLZ
RIN to ROUT, CL = 150pF
|tPHL - tPLH| at 1.5V
90
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
5
TYPICAL PERFORMANCE CHARACTERISTICS
400
3
Charge Pump Turn-on Time (s)
350
2.5
TIN to ROUT Propagation Delay (s)
300
2
250
1.5
200 Charge Pump Turn-on Time (us) 150
1
Tin to Rout Propagation Delay (us) 0.5
100 -55 -30 -5 20 Temperature (C) 45 70 95
0 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 Load Capacitiance (pF)
Turn on Time vs. Temperature
Transmitter Input to Receiver Output Propagation Delay vs. Load Capacitance
40 35 30
30
Transmitter Output Slew Rate (V/s)
25
1Mbps
Supply Current (mA)
25 20 15 Supply Current (mA) 10 5 0 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 Load Capacitiance (pF)
20
250kbps
15
10
5 Transmitter Output Slew Rate (V/us) 0 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 Load Capacitiance (pF)
ICC vs. Load Capacitance
Transmitter Output Slew Rate vs. Load Capacitance
400
6 5
350
V+
Transmitter Output Voltage (V)
4 3 2 0 -1 -2 -3 -4 Transmitter Output Voltage (V) -5 -6 0 500 1000 1500 1
300 250
3245, 1Mbps
Skew (ns)
200
Skew (ns) 150 100 3244, 250kbps
V-
50
2000
2500
3000
3500
4000
4500
5000
0
0 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500
Load Capacitiance (pF)
Load Capacitance (pF)
Transmitter Output vs. Load Capacitance
Transmitter Skew vs. Load Capacitance
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
6
TYPICAL PERFORMANCE CHARACTERISTICS
SP3244E Charge Pump Levels Out of Shutdown
SP3244E C2+ Charge Pump Waveforms - Vcc=3.3V, All channels switching
SP3244E Charge Pump Levels Into Shutdown
SP3244E C2+ Charge Pump Waveforms Vcc=5.0V, All channels switching
SP3244E Charge Pump Waveforms for 250kbps Clock Rate
Rev M 10/9/06
SP3244E Charge Pump Power On TimeVcc=3.3V, T=27C
(c) Copyright 2006 Sipex Corporation
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
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TYPICAL PERFORMANCE CHARACTERISTICS
SP3244E Charge Pump Power On Time - Vcc=3.3V, T=85C
SP3244E Waveforms for 250kpbs Clock Rate RL=3k CL=4700pF
SP3244E Charge Pump Power On Time - Vcc=3.3V, T=-40C
SP3245E Waveforms for 1Mbps Clock Rate RL=3k CL=1000pF
SP3244E Waveforms for 250kpbs Clock Rate RL=3k CL=1000pF
Rev M 10/9/06
SP3245E Waveforms for 1Mbps Clock Rate RL=3k CL=50pF
(c) Copyright 2006 Sipex Corporation
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
8
TYPICAL PERFORMANCE CHARACTERISTICS
SP2345 Waveforms for 1Mbps Clock Rate - RL=3k, CL=250pF
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
9
The SP3244E and SP3245E are 3-driver/5-receiver devices ideal for serial ports in batterypowered, portable, or handheld applications such as notebook or handheld computers. SP3244E/3245E transceivers meet the EIA/ TIA-232 and ITU-T V.28/V.24 communication protocols for reliable serial communication. The SP3244E/3245E devices feature Sipex's proprietary and patented (U.S. 5,306,954) on-board charge pump circuitry that generates 5.5V RS-232 voltage levels from a single +3.0V to +5.5V power supply. The SP3244E/3245E is an ideal choice for power sensitive designs. With the Auto On-line(R) Plus enabled the SP3244E/3245E reduces power consumption to a 1A supply current whenever the transceivers are idle. In shutdown, the internal charge pump and the drivers will shut down. Receivers remain active unless the device is put into manual shutdown using the SHUTDOWN pin. This feature allows design engineers to address power saving concerns without major design changes. Theory Of Operation The SP3244E/3245E is made up of four basic circuit blocks: 1. Drivers, 2. Receivers, 3. the Sipex proprietary charge pump, and 4. Auto On-line(R) Plus circuitry. Drivers The drivers are inverting level transmitters that convert TTL or CMOS logic levels to 5.0V EIA/ TIA-232 levels with an inverted sense relative to the input logic levels. Typically, the RS-232 output voltage swing is +5.4V with no load and +5V minimum fully loaded. The driver outputs are protected against infinite short circuits to ground without degradation in reliability. These drivers comply with the EIA/TIA-232-F and all previous RS-232 versions. Unused driver inputs should be connected to GND or VCC. The SP3244E/3245E devices operate at this typical data rate when fully loaded. The drivers can guarantee output data rates fully loaded with 3K in parallel with 1000pF (SP3244E), or 250pF (SP3245E) ensuring compatibility with popular PC-to-PC communication software. The slew rate of the driver output on the SP3244E is internally limited to a maximum of 30V/s in order to meet the EIA standards
Rev M 10/9/06
(EIA RS-232D 2.1.7, Paragraph 5). The slew rate of SP3245E is not limited to enable higher speed data transfers. The transition of the loaded output from HIGH to LOW also meets the monotonic signal transition requirements of the standard. Receivers The receivers convert EIA/TIA-232 signal levels to TTL or CMOS logic output levels. Receivers remain active unless the device is put into manual shutdown using the SHUTDOWN pin. The non-inverted output of Receiver 2 (R2OUT) will continue to be active in all modes, including shutdown. Since receiver input is usually from a transmission line where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 500mV. This ensures that the receiver is virtually immune to noisy transmission lines. Should an input be left unconnected, an internal 5K pulldown resistor to ground will commit the output of the receiver to a HIGH state. Highly Efficient Charge Pump The charge pump is used to generate positive and negative signal voltages for the RS-232 drivers. This enables fully compliant RS-232 and V.28 signals from a single 3.0 or 5.5V power supply. The charge pumps use four external capacitors to hold and transfer electrical charge. The Sipex patented design (US Patent #5,306,954) uses a unique approach compared to older less efficient designs. The pumps use a four-phase voltage shifting technique to attain symmetrical V+ and V- power supplies. An intelligent control oscillator regulates the operation of the charge pump to maintain the proper voltages at maximum efficiency. Phase 1 VSS charge store and double. The positive terminals of capacitors C1 and C2 are charged from VCC with their negative terminals initially connected to ground. C1+ is then connected to ground and the stored charge from C1- is superimposed onto C2- . Since C2+ is still connected to VCC the voltage potential across capacitor C2 is now 2 x VCC.
DESCRIPTION
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
10
DESCRIPTION
+ V CC -
Phase 2 - Vss transfer from C2 to C4. Meanwhile C1 is charged to Vcc
+
+ V CC -
C
+
1
C
+
2
V+
e-
C
+
3
Phases 1 and 3: Store/Double. Double charge from C1 onto C2. C2 is now charged to -2xVcc
e-
e-
C
Vss
4
+
C
+
1
C
+
2
V+ V-
C
+
3
Patented 5,306,954 (Sipex, inc.)
+ V CC -
ee-
C
4
Phase 4 VDD transfer from C2 to C3. Meanwhile C1 is charged to Vcc
V
e+
DD
e+
+
C
+
1
C
+
2
V+ V-
C
+
3
e-
C
4
Charge Pump Phases
Minimum Recommended Charge Pump Capacitor Values Input Voltage VCC 3.0V to 3.6V 4.5V to 5.5V 3.0V to 5.5V Charge Pump Capacitor Value for SP32XX C1-C4=0.1F C1=0.047F, C2-C4=0.33F C1-C4=0.22F
Charge Pump Capacitor Values
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
11
Phase 2 VSS transfer and invert: Phase two connects the negative terminal of C2 to the VSS storage capacitor and the positive terminal of C2 to ground. This transfers the doubled and inverted (V-) voltage onto C4. Meanwhile, capacitor C1 charged from VCC to prepare it for its next phase. Phase 3 VDD charge store and double: Phase three is identical to the first phase. The positive terminals of capacitors C1 and C2 are charged from VCC with their negative terminals initially connected to ground. C1+ is then connected to ground and the stored charge from C1- is superimposed onto C2-. Since C2+ is still connected to VCC the voltage potential across capacitor C2 is now 2 x VCC. Phase 4 VDD transfer: The fourth phase connects the negative terminal of C2 to ground and the positive terminal of C2 to the VDD storage capacitor. This transfers the doubled (V+) voltage onto C3. Meanwhile, capacitor C1 charged from VCC to prepare it for its next phase. The Sipex chargepump generates V+ and V- independently from VCC. Hence in a no-load condition V+ and V- will be symmetrical. Older charge pump approaches generate V+ and then use part of that stored charge to generate V-. Because of inherent losses the magnitude of Vwill be smaller than V+ on these older designs. Under lightly loaded conditions the intelligent pump oscillator maximizes efficiency by running only as needed to maintain V+ and V-. Since interface transceivers often spend much of their time at idle this power-efficient innovation can greatly reduce total power consumption. This improvement is made possible by the independent phase sequence of the Sipex charge-pump design. The clock rate for the charge pump typically operates at greater than 70kHz allowing the pump to run efficiently with small 0.1F capacitors. Efficient operation depends on rapidly charging and discharging C1 and C2, therefore capacitors should be mounted close to the IC and have low ESR (equivalent series resistance). Inexpensive
Rev M 10/9/06
surface mount ceramic capacitors (such as are widely used for power-supply decoupling) are ideal for use on the charge pump. The charge pumps are designed to be able to function properly with a wide range of capacitor styles and values. If polarized capacitors are used the positive and negative terminals should be connected as shown on the Typical Operating Circuit. Capacitance values may be increased if operating at higher VCC or to provide greater stability as the capacitors age. See Charge Pump Capacitor Value table on page 11. Auto On-line(R) Plus Circuitry The SP3244E/3245E devices have the advanced Auto On-line(R) Plus feature that saves power by turning off the charge pumps and driver outputs when the transceiver inputs are idle for more than 30 seconds. RS-232 signals use both positive and negative voltages of greater than 5V magnitude. Receivers have nominal 5k impedance to ground. Even when idle, drivers will maintain output signal voltage creating a continuous current flow. In low power battery operated devices this constant current drain can decrease battery life significantly.
Receiver
DESCRIPTION
5k
Reciever 5k Current path h GND Fig ure 0 R eceiver 5k Current Pat toto G round Auto On-line(R) Plus devices may be configured to emulate the behavior of devices with our earlier Auto On-line(R) feature. Auto On-line(R) Plus puts the device into a low power mode when driver and receiver inputs are idle and reawakes upon detecting signal transitions. Auto On-line(R) puts the device into a low power mode when receiver inputs are left floating and reawakes when receivers are driven greater than 2.7V magnitude by incoming RS-232 signal.
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
12
Auto On-line(R) Plus provides greater power savings in typical operation because the transceiver will go into low power standby mode unless a communication link is in use. Signals such as CTS, RTS, DTR, DSR, or RI will typically change signal-state to establish handshaking before any actual data-communication takes place. Transitions on these handshake signals will wake up the Auto On-line(R) Plus transceiver to prepare it for sending data (tONLINE 100s typical). Receivers remain active to detect incoming signals in Auto On-line(R) Plus standby mode. Receiver outputs may be disabled by entering manual shutdown by driving SHUTDOWN pin to logic 0. A special non-inverted receiver output R2OUT remains active in all modes, including SHUTDOWN pin at logic 0. In some applications if there is a significant delay (greater than tOFFLINE) between the handshaking transitions and the start of data communication the transceiver may enter Auto On-Line(R) Plus standby mode before data communication begins. The tOFFLINE interval is at least 15 seconds and no longer than 60 seconds. In applications where the transceiver needs to remain active anytime it is connected to live RS-232 signals, even if those signals remain idle for longer than tOFFLINE, then the STATUS output may be used to drive the ONLINE pin. The STATUS output pin functions the same in both Auto On-line(R) and Auto On-line(R) Plus devices. STATUS will output logic 1 if any of the receiver inputs are driven greater than 2.7V magnitude by incoming RS-232 signals and drives logic 0 if receiver inputs are floating or driven to ground. Driving the ONLINE pin with the STATUS output disables Auto On-line(R) Plus (Forced On-Line) whenever RS-232 voltages are seen on any receiver inputs. If no RS-232 voltages are seen on the receiver inputs the Auto On-line(R) Plus transceiver will still activate its charge pump and driver outputs when the driver inputs are active. This allows the transceiver to signal a remote Auto On-Line(R) or Auto On-Line(R) Plus, on the other end of the data cable, to wake up. The STATUS output pin remains active in all
Rev M 10/9/06
modes, including SHUTDOWN pin at logic 0. Connecting STATUS output to drive both ONLINE and SHUTDOWN will wake the transceiver if any receiver inputs are driven greater than 2.7V magnitude and put the transceiver into Forced Shutdown mode if all receiver inputs are floating or driven to ground.
DESCRIPTION
15KV ESD PROTECTION ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver output and receiver inputs of the SP3244E/3245E have extra protection against static electricity. Sipex uses state-ofthe-art structures to protect these pins against ESD of 15kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, the SP3244E/3245E keep working without latch-up or damage. ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of the SP3244E/3245E are characterized for protection to the following limits: * 15kV using the Human Body Model * 8kV using the Contact Discharge method specified in IEC 1000-4-2 * 15kV using the Air-Gap Discharge method specified in IEC 1000-4-2
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
13
DESCRIPTION Auto On-Line(R) Plus Truth Table
Operating mode Forced Shutdown Forced Online
Auto On-line(R) Plus (Wake When Active) Auto On-line(R) Plus
ONLINE X 1 0 0 STATUS STATUS STATUS STATUS STATUS
SHUTDOWN 0 1 1 1 1 1 1 STATUS STATUS
|RxIN| > 2.7 V X X X X yes no no yes no
Idle inputs (RxIN & TxIN) X X active idle > 30s X active idle > 30s X X
TxOUT high-Z active active high-Z active active high-Z active high-Z
RxOUT high-Z active active active active active active active active
R2OUT active active active active active active active active active
(Off-Line When Idle)
Auto On-line(R) Plus
(Wake On Cable)
Auto On-line(R) Plus (Wake When Active) Auto On-line(R) Plus (Off-Line When Idle) Auto On-line(R)
(Wake On Cable)
Auto On-line(R)
(Auto Shutoff)
ESD Test Conditions ESD performance depends on a variety of conditions. Contact Sipex for a reliability report that documents test setup, methodology and results. IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment. However, it does not specifically refer to integrated circuits. The SP3244E/3245E helps you design equipment to meet IEC 1000-4-2, without sacrificing boardspace and cost for external ESD-protection components. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is a higher peak current in IEC 1000-4-2.
Series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. The air-gap test involves approaching the device with a charged probe. The contact discharge method connects the probe to the device before the probe is energized. Machine Model The machine model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. The objective is to emulate the stress caused when I/O pins are contacted by handling equipment during test and assembly.
ESD Table
Device Pin Tested TxOUT RxIN TxIN, RxOUT, ONLINE, SHUTDOWN, STATUS Human Body Model 15kV 15kV IEC1000-4-2 Air discharge 15kV 15kV Contact discharge 8kV 8kV Level 4 4
2kV
2kV
2kV
1
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
14
DESCRIPTION
Valid RS232 Level: STATUS = 1
2.7V
SHUTDOWN
Indeterminate
0.3V -0.3V
T_IN
Edge Detect
S
Invalid Level: STATUS = 0
R_IN
30 second timer
R
IDLE
Edge Detect
SHUTDOWN
Indeterminate
-2.7V
T_IN
Edge ONLINE Detect
S
Valid RS232 Level: STATUS = 1
R_IN
R Auto On-line(R) Plus Logic Edge
30 second timer
IDLE
Detect SHUTDOWN
ONLINE
IDLE
Low-Power Shutdown
Receiver Positive and Negative Threshold versus STATUS Output Signal
ONLINE
SHUTDOWN ONLINE
IDLE
Low-Power Shutdown
STATUS Output Logic
SHUTDOWN ONLINE
Low-Power Shutdown
IDLE
Shutdown Logic
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
15
AUTO ON-LINE(R) PLUS
RECEIVER INPUTS INVALID } REGION
TRANSMITTER INPUTS
TRANSMITTER OUTPUTS STATUS Vcc t TSTL OUTPUT 0 Vcc OUTPUT 0 V+ Vcc 0 V-
t STH
t OFFLINE tONLINE
t OFFLINE
tONLINE
Auto On-Line(R) Plus Timing Diagram tSTL (=30s typ.) tSTH (=0.4s typ.) tOFFLINE (=30s typ.) tONLINE (=100s typ.)
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
16
TYPICAL OPERATING CIRCUIT
VCC C5 C1 + + 0.1F 28 C1+ 0.1F 24 C11 C2+ SP3244E/45E V- 3 0.1F 2 C214 T1IN 13 T2IN 12 T3IN 20 R2OUT 19 R1OUT 18 R2OUT TTL/CMOS OUTPUTS 17 R3OUT 16 R4OUT 15 R5OUT VCC
Online Control To P Supervisor Circuit
26 VCC
V+ 27 C3
+
0.1F
C2
+
C4 T1OUT 9 T2OUT 10 T3OUT 11 R1IN 4 5K R2IN 5
+
0.1F
TTL/CMOS INPUTS
RS-232 OUTPUTS
5K R3IN 6 5K R4IN 7 5K R5IN 8 5K
RS-232 INPUTS
22 SHUTDOWN 23 ONLINE 21 STATUS
GND 25
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
17
PACKAGE PINOUT
C2+ 1 C2- 2 V- 3 R1IN 4
28 C1+ 27 V+ 26 VCC 25 GND
24 C1R2IN 5 R3IN 6 SP3244E 23 ONLINE SP3245E 22 SHUTDOWN R4IN 7 21 STATUS R5IN 8 T1OUT 9 T2OUT 10 T3OUT 11 T3IN 12 T2IN 13 T1IN 14
C2+ C1+ C2NC V+
20 R2OUT 19 R1OUT 18 R2OUT 17 R3OUT 16 R4OUT 15 R5OUT
CC
31
30
29
28
27
26
V
R1 R2 R3 R4 R5 T1 T2 T3
32
25
NC
V-
IN
1
24
GND C1ONLINE SHUTDOWN STATUS R2 R1 R2
IN
2
3
4
5
6
7
8
23
22
21
20
19
18
17
IN
IN
SP3244/SP3245 QFN-32 TOP VIEW
IN
OUT
OUT
OUT
OUT
OUT
OUT
10
11
12
OUT
13
OUT
14
NC
OUT
IN
IN
IN
15
R5
T3
T2
T1
R4
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
R3
NC
16
9
(c) Copyright 2006 Sipex Corporation
18
28 PIN TSSOP
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
19
28 PIN SSOP
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
20
32 PIN QFN
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
(c) Copyright 2006 Sipex Corporation
21
ORDERING INFORMATION Part number SP3244ECA-L SP3244ECY-L SP3244EEA-L SP3244EEY-L SP3244EER1-L SP3245ECA-L SP3245ECY-L SP3245EEA-L SP3245EEY-L SP3245EER1-L
Available in lead free packaging. Available in Tape and Reel. To order add "/TR" suffix to part number, Example: SP3244ECA-L= Standard: SP3244ECA-L/TR =Tape and Reel
Temperature range From 0 to +70C From 0 to +70C From -40 to +85C From -40 to +85C From -40 to +85C From 0 to +70C From 0 to +70C From -40 to +85C From -40 to +85C From -40 to +85C
Package Type 28 pin SSOP 28 pin TSSOP 28 pin SSOP 28 pin TSSOP 32 pin QFN 28 pin SSOP 28 pin TSSOP 28 pin SSOP 28 pin TSSOP 32 pin QFN
Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Solved by Sipex
TM
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus (c) Copyright 2006 Sipex Corporation
22

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