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IN74AC651

Octal 3-State Bus Transceivers and D Flip-Flops High-Speed Silicon-Gate CMOS

Integral Corp. 

TECHNICAL DATA

IN74AC651

Octal 3-State Bus Transceivers

and D Flip-Flops

High-Speed Silicon-Gate CMOS

The IN74AC651 is identical in pinout to the LS/ALS651,

HC/HCT651. The device inputs are compatible with standard CMOS

outputs; with pullup resistors, they are compatible with LS/ALS

outputs.

These devices consists of bus transceiver circuits, D-type flip-flop,

and control circuitry arranged for multiplex transmission of data

directly from the data bus or from the internal storage registers.

Direction and Output Enable are provided to select the read-time or

stored data function. Data on the A or B Data bus, or both, can be

stored in the internal D flip-flops by low-to-high transitions at the

appropriate clock pins (A-to-B Clock or B-to-A Clock) regardless of

the select or enable or enable control pins. When A-to-B Source and

B-to-A Source are in the real-time transfer mode, it is also possible to

store data without using the internal D-type flip-flops by

simultaneously enabling Direction and Output Enable. In this

configuration each output reinforces its input. Thus, when all other

data sources to the two sets of bus lines are at high impedance, each set

of bus lines will remain at its last state.

The IN74AC651 has inverted outputs.

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 2.0 to 6.0 V

• Low Input Current: 1.0 µA, 0.1 µA @ 25°C

• High Noise Immunity Characteristic of CMOS Devices

• Outputs Source/Sink 24 mA

LOGIC DIAGRAM

ORDERING INFORMATION

IN74AC651N Plastic

IN74AC651DW SOIC

TA = -40° to 85° C for all

packages

PIN ASSIGNMENT

PIN 24=VCC

PIN 12 = GND

516

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