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IDT74LVCH2245A 3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS OCTAL BUS IDT74LVCH2245A TRANSCEIVER WITH 3-STATE OUTPUTS, 5 VOLT TOLERANT I/O, AND BUS-HOLD
FEATURES:
* 0.5 MICRON CMOS Technology * ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) * VCC = 3.3V 0.3V, Normal Range * VCC = 2.7V to 3.6V, Extended Range * CMOS power levels (0.4 W typ. static) * Rail-to-rail output swing for increased noise margin * All inputs, outputs, and I/O are 5V tolerant * Supports hot insertion * Available in SOIC, SSOP, QSOP, and TSSOP packages
DESCRIPTION:
DRIVE FEATURES: APPLICATIONS:
* Balanced Output Drivers: 12mA (B Port) * High Output Drivers: 24mA (A Port)
This bus transceiver is built using advanced dual metal CMOS technology. The LVCH2245A device is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated. Inputs can be driven from either 3.3V or 5V devices. This feature allows the use of this device as a translator in a mixed 3.3V/5V environment. The LVCH2245A has series resistors in the output structure of the "B" port, which will significantly reduce line noise when used with light loads. The driver has been designed to drive 12mA at the designated threshold levels. The "A" port has a 24mA driver. The LVCH2245A has "bus-hold" which retains the inputs' last state whenever the input goes to a high-impedance. This prevents floating inputs and eliminates the need for pull-up/down resistors.
* 5V and 3.3V mixed voltage systems * Data communication and telecommunication systems
FUNCTIONAL BLOCK DIAGRAM
DIR
1 19 2 18
OE
A1
B1
TO SEVEN OTHER CHANNELS
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
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(c) 1999 Integrated Device Technology, Inc.
OCTOBER 1999
DSC-4937/1
IDT74LVCH2245A 3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Description Max VTERM Terminal Voltage with Respect to GND Storage Temperature DC Output Current Continuous Clamp Current, VI < 0 or VO < 0 Continuous Current through each VCC or GND -0.5 to +6.5 -65 to +150 -50 to +50 -50 100
Unit V C mA mA mA
DIR A1 A2 A3 A4 A5 A6 A7 A8 GND
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VCC OE B1 B2 B3 B4 B5 B6 B7 B8
TSTG IOUT IIK IOK ICC ISS
NOTE: 1. 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.
CAPACITANCE (TA = +25C, F = 1.0MHz)
Symbol CIN COUT CI/O Parameter(1) Input Capacitance Output Capacitance I/O Port Capacitance Conditions VIN = 0V VOUT = 0V VIN = 0V Typ. 4.5 5.5 6.5 Max. 6 8 8 Unit pF pF pF
SOIC/ SSOP/ QSOP/ TSSOP TOP VIEW
NOTE: 1. As applicable to the device type.
PIN DESCRIPTION
Pin Names OE DIR Ax Bx Description Output Enable Input (Active LOW) Direction Control Output Side A Inputs or 3-State Outputs(1) Side B Inputs or 3-State Outputs(1)
NOTE: 1. These pins have "Bus-Hold". All other pins are standard inputs, outputs, or I/Os.
FUNCTION TABLE(1)
Inputs OE L L H DIR L H X Outputs B Data to A Bus A Data to B Bus Isolation
NOTE: 1. H = HIGH Voltage Level X = Don't Care L = LOW Voltage Level
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IDT74LVCH2245A 3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Operating Condition: TA = -40C to +85C
Symbol VIH VIL IIH IIL IOZH IOZL IOFF VIK VH ICCL ICCH ICCZ ICC High Impedance Output Current (3-State Output pins) Input/Output Power Off Leakage Clamp Diode Voltage Input Hysteresis Quiescent Power Supply Current VCC = 0V, VIN or VO 5.5V VCC = 2.3V, IIN = -18mA VCC = 3.3V VCC = 3.6V VIN = GND or VCC -- -- -- -- -- -- -- -0.7 100 -- -- -- 50 -1.2 -- 10 10 500 A V mV A VCC = 3.6V VO = 0 to 5.5V -- -- 10 A Parameter Input HIGH Voltage Level Input LOW Voltage Level Input Leakage Current VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V VCC = 3.6V VI = 0 to 5.5V Test Conditions Min. 1.7 2 -- -- -- Typ.(1) -- -- -- -- -- Max. -- -- 0.7 0.8 5 A V Unit V
Quiescent Power Supply Current Variation
3.6 VIN 5.5V(2) One input at VCC - 0.6V, other inputs at VCC or GND
A
NOTES: 1. Typical values are at VCC = 3.3V, +25C ambient. 2. This applies in the disabled state only.
BUS-HOLD CHARACTERISTICS
Symbol IBHH IBHL IBHH IBHL IBHHO IBHLO
NOTES: 1. Pins with Bus-Hold are identified in the pin description. 2. Typical values are at VCC = 3.3V, +25C ambient.
Parameter(1) Bus-Hold Input Sustain Current Bus-Hold Input Sustain Current Bus-Hold Input Overdrive Current VCC = 3V VCC = 2.3V VCC = 3.6V
Test Conditions VI = 2V VI = 0.8V VI = 1.7V VI = 0.7V VI = 0 to 3.6V
Min. - 75 75 -- -- --
Typ.(2) -- -- -- -- --
Max. -- -- -- -- 500
Unit A A A
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IDT74LVCH2245A 3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
OUTPUT DRIVE CHARACTERISTICS (A PORT)
Symbol VOH Parameter Output HIGH Voltage VCC = 2.3V VCC = 2.3V VCC = 2.7V VCC = 3V VCC = 3V VOL Output LOW Voltage VCC = 2.3V to 3.6V VCC = 2.3V VCC = 2.7V VCC = 3V IOH = - 24mA IOL = 0.1mA IOL = 6mA IOL = 12mA IOL = 12mA IOL = 24mA Test Conditions(1) VCC = 2.3V to 3.6V IOH = - 0.1mA IOH = - 6mA IOH = - 12mA Min. VCC - 0.2 2 1.7 2.2 2.4 2 -- -- -- -- -- Max. -- -- -- -- -- -- 0.2 0.4 0.7 0.4 0.55 V Unit V
NOTE: 1. VIH and VIL must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate VCC range. TA = - 40C to + 85C.
OUTPUT DRIVE CHARACTERISTICS (B PORT)
Symbol VOH Parameter Output HIGH Voltage VCC = 2.3V VCC = 2.7V VCC = 3V VOL Output LOW Voltage VCC = 2.3V to 3.6V VCC = 2.3V VCC = 2.7V VCC = 3V Test Conditions(1) VCC = 2.3V to 3.6V IOH = - 0.1mA IOH = - 4mA IOH = - 6mA IOH = - 4mA IOH = - 8mA IOH = - 6mA IOH = - 12mA IOL = 0.1mA IOL = 4mA IOL = 6mA IOL = 4mA IOL = 8mA IOL = 6mA IOL = 12mA Min. VCC - 0.2 1.9 1.7 2.2 2 2.4 2 -- -- -- -- -- -- -- Max. -- -- -- -- -- -- -- 0.2 0.4 0.55 0.4 0.6 0.55 0.8 V Unit V
NOTE: 1. VIH and VIL must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate VCC range. TA = - 40C to + 85C.
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IDT74LVCH2245A 3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
OPERATING CHARACTERISTICS, VCC = 3.3V 0.3V, TA = 25C
Symbol CPD CPD Parameter Power Dissipation Capacitance per Transceiver Outputs enabled Power Dissipation Capacitance per Transceiver Outputs disabled Test Conditions CL = 0pF, f = 10Mhz Typical 48 4 Unit pF
SWITCHING CHARACTERISTICS (A PORT)(1)
Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ tSK(o) Parameter Propagation Delay Bx to Ax Output Enable Time OE to Ax Output Disable Time OE to Ax Output Skew(2) Min.
-- -- -- --
VCC = 2.7V Max. 7.3 9.5 8.5
VCC = 3.3V 0.3V Min. Max. 1.5 6.3 1.5 1.7 8.5 7.5 500
Unit ns ns ns ps
--
--
NOTES: 1. See TEST CIRCUITS AND WAVEFORMS. TA = - 40C to + 85C. 2. Skew between any two outputs of the same package and switching in the same direction.
SWITCHING CHARACTERISTICS (B PORT)(1)
Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ tSK(o) Parameter Propagation Delay Ax to Bx Output Enable Time OE to Bx Output Disable Time OE to Bx Output Skew(2) Min. -- -- -- VCC = 2.7V Max. 8.1 10 9.2 VCC = 3.3V 0.3V Min. Max. 1.5 7.1 1.5 1.7 9 8.2 500 Unit ns ns ns ps
--
--
--
NOTES: 1. See TEST CIRCUITS AND WAVEFORMS. TA = - 40C to + 85C. 2. Skew between any two outputs of the same package and switching in the same direction.
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IDT74LVCH2245A 3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS TEST CONDITIONS
Symbol VLOAD VIH VT VLZ VHZ CL VCC(1)= 3.3V0.3V VCC(1)= 2.7V 6 2.7 1.5 300 300 50 6 2.7 1.5 300 300 50 VCC(2)= 2.5V0.2V 2 x Vcc Vcc Vcc / 2 150 150 30 Unit V V V mV mV pF
SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL
VIH VT 0V VOH VT VOL VIH VT 0V
LVC Link
VCC 500 Pulse (1, 2) Generator VIN D.U.T. RT 500 CL VOUT
VLOAD Open GND CONTROL INPUT
Propagation Delay
ENABLE DISABLE VIH VT 0V VLOAD/2 VOL+VLZ VOL VOH VOH-VHZ 0V
LVC Link
tPZL OUTPUT SWITCH NORMALLY VLOAD LOW tPZH OUTPUT SWITCH NORMALLY GND HIGH VLOAD/2 VT tPHZ VT 0V
tPLZ
LVC Link
Test Circuit for All Outputs
DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. NOTES: 1. Pulse Generator for All Pulses: Rate 10MHz; tF 2.5ns; tR 2.5ns. 2. Pulse Generator for All Pulses: Rate 10MHz; tF 2ns; tR 2ns.
NOTE: 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
Enable and Disable Times
SWITCH POSITION
Test Open Drain Disable Low Enable Low Disable High Enable High All Other Tests Switch VLOAD GND Open
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL SYNCHRONOUS CONTROL VIH VT 0V VOH VT VOL VOH VT VOL
tSU
tH
tREM
tSU
tH
VIH VT 0V VIH VT 0V VIH VT 0V VIH VT 0V
LVC Link
INPUT
Set-up, Hold, and Release Times
tPLH1
tPHL1
OUTPUT 1
tSK (x)
tSK (x)
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
VT
OUTPUT 2 tPLH2 tPHL2
VT
Pulse Width
LVC Link
LVC Link
tSK(x) = tPLH2 - tPLH1 or tPHL2 - tPHL1
Output Skew - tSK(X)
NOTES: 1. For tSK(o) OUTPUT1 and OUTPUT2 are any two outputs. 2. For tSK(b) OUTPUT1 and OUTPUT2 are in the same bank.
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IDT74LVCH2245A 3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
X LVC IDT XX XX XXXX Temp. Range Bus-Hold Device Type Package
SO PY Q PG 2245A H 74
Small Outline IC (gull wing) Shrink Small Outline Package Quarter Size Small Outline Package Thin Shrink Small Outline Package Octal Bus Transceiver with 3-State Outputs, 12mA (B port) 24mA (A port) Bus-hold -40C to +85C
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