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Part: 74LVCH2245A
Category:
Logic
Description: 3.3V CMOS Octal Bus Transceiver With 3-STATE Outputs, 5V Tolerant I/O, Bus-hold
Company: Integrated Device Technology, Inc.
Datasheet: Download 74LVCH2245A datasheet File size : 143 kB
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Datasheet text preview:
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 (0.4µ W typ. static) µ · 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
1
© 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 = +25°C, F = 1.0MHz)
Symbol CI N CO U T 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 = 40°C to +85°C
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 µA V mV µA VCC = 3.6V VO = 0 to 5.5V -- -- ±10 µA 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 µA 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
µA
NOTES: 1 . Typical values are at VCC = 3.3V, +25°C 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, +25°C 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 µA µA µA
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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 = 40°C to + 85°C.
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 = 40°C to + 85°C.
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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 = 25°C
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 = 40°C to + 85°C. 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 = 40°C to + 85°C. 2 . Skew between any two outputs of the same package and switching in the same direction.
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