OCTAL BIDIRECTIONAL TRANSCEIVER
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MC74AC640 MC74ACT640 Octal Bidirectional Transceiver with 3ĆState Outputs
The MC74AC640/74ACT640 oc...
Description
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MC74AC640 MC74ACT640 Octal Bidirectional Transceiver with 3ĆState Outputs
The MC74AC640/74ACT640 octal bus transceiver is designed for asynchronous two-way communication between data buses. The device transmits data from bus A to bus B when T/R = HIGH, or from bus B to bus A when T/R = LOW. The enable input can be used to disable the device so the buses are effectively isolated. Bidirectional Data Path A and B Outputs Sink 24 mA/Source –24 mA ′ACT640 Has TTL Compatible Inputs
N SUFFIX CASE 738-03 PLASTIC
OCTAL BIDIRECTIONAL TRANSCEIVER WITH 3-STATE OUTPUTS
VCC 20
OE 19
B0 18
B1 17
B2 16
B3 15
B4 14
B5 13
B6 12
B7 11
1 T/R
2 A0
3 A1
4 A2
5 A3
6 A4
7 A5
8 A6
9 A7
10 GND
DW SUFFIX CASE 751D-04 PLASTIC
PIN NAMES A0–A7 OE T/R B0–B7 Side A Inputs or 3-State Outputs Output Enable Input Transmit/Receive Input Side B Inputs or 3-State Outputs
TRUTH TABLE
OE H L L L L T/R X H H L L Applied Inputs X H L H L Valid Direction I/P→O/P X A to B A to B B to A B to A Output X L H L H
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
FACT DATA
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5-1
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MC74AC640 MC74ACT640
MAXIMUM RATINGS*
Symbol VCC Vin Vout Iin Iout ICC Tstg Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage (Referenced to GND) DC Output Voltage (Referenced to GND) DC Input Current, per Pin DC Output Sink/Source Current, per Pin DC VCC or GND Current per Output Pin Storage Temperature Value –0.5 to +7.0 –0.5 to V...
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