Data Sheet

©1983 Fairchild Semiconductor Corporation www.fairchildsemi.com
MM74HC164 Rev. 1.5.0 2
MM74HC164 — 8-Bit Serial-in/Parallel-out Shift Register
Connection Diagram
Top View
Truth Table
H = HIGH Level (steady state)
L = LOW Level (steady state)
X = Irrelevant (any input, including transitions)
↑ = Transition from LOW-to-HIGH level.
Q
AO
, Q
BO
, Q
HO
= the level of Q
A
, Q
B
, or Q
H
,
respectively, before the indicated steady state input
conditions were established.
Q
An
, Q
Gn
= The level of Q
A
or Q
G
before the most
recent ↑ transition of the clock; indicated a one-bit shift.
Logic Diagram
Inputs Outputs
Clear Clock A B Q
A
Q
B
... Q
H
LXXXL L ... L
HLXXQ
AO
Q
BO
... Q
HO
H ↑ HH H Q
An
... Q
Gn
H ↑ LX L Q
A
... Q
Gn
H ↑ XL L Q
An
... Q
Gn