MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Octal 3-State Inverting Bus Transceiver
High–Performance Silicon–Gate CMOS
The MC...
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Octal 3-State Inverting Bus Transceiver
High–Performance Silicon–Gate
CMOS
The MC54/74HC640A is identical in pinout to the LS640. The device inputs are compatible with standard
CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs.
The HC640A is a 3–state transceiver that is used for 2–way asynchronous communication between data buses. The device has an active–low Output Enable pin, which is used to place the I/O ports into high–impedance states. The Direction control determines whether data flows from A to B or from B to A.
Output Drive Capability: 15 LSTTL Loads Outputs Directly Interface to
CMOS, NMOS, and TTL Operating
Voltage Range: 2 to 6 V Low Input Current: 1 µA High Noise Immunity Characteristic of
CMOS Devices In Compliance with the Requirements Defined by JEDEC Standard
No. 7A Chip Complexity: 276 FETs or 69 Equivalent Gates
MC54/74HC640A
20 1
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