HD74AC166/HD74ACT166
8-bit Shift Register
Description
The HD74AC166/HD74ACT166 is an 8-bit, serial or parallel-in, serial-out shift register using edge
triggered D-type flip-flops. Serial and parallel entry are synchronous, with state changes initiated by the
rising edge of the clock. An asynchronous Master Reset overrides other inputs and clears all flip-flops.
The circuit can be clocked from two sources or one CP input can be used to trigger the other.
Features
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Outputs Source/Sink 24 mA
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HD74ACT166 has TTL-Compatible Inputs
Pin Arrangement
D
S
1
P
0
2
P
1
3
P
2
4
P
3
5
CP
2
6
CP
1
7
GND 8
(Top view)
16 V
CC
15
PE
14 P
7
13 Q
7
12 P
6
11 P
5
10 P
4
9
MR
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