IN74HC652
OCTAL 3-STATE BUS TRANSCEIVERS
AND D FLIP-FLOPS
High-Performance Silicon-Gate CMOS
The IN74HC652 is identical in pinout to the LS/ALS652. The
device inputs are compatible with standard CMOS outputs; with
pullup resistors, they are compatible with LS/ALSTTL 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.
ORDERING INFORMATION
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 simulta-neously 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.
IN74HC651N Plastic
IN74HC651DW SOIC
TA = -55° to 125° C for all
packages
PIN ASSIGNMENT
The IN74HC652 has noninverted outputs.
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA
• High Noise Immunity Characteristic of CMOS Devices
LOGIC DIAGRAM
PIN 24=VCC
PIN 12 = GND
1
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