HD74LS166A Datasheet, PDF (5/8 Pages) Hitachi Semiconductor – 8-bit Shift Registers

HD74LS166A
Testing Method
Test Circuit
4.5V
V_CC
P.G.
Zout = 50Ω
Input
Clear
Serial Input
Shift/Load
A
B
QH
C
D
E
F
G
H
Clock
Clock
Inhibit
RL
Output
CL
Notes: 1. C_L includes probe and jig capacitance.
2. All diodes are 1S2074(H).
Testing table
Data inputs
Data H
Serial-in
Shift / Load
0V
4.5 V
Output
Q_H
Q_H
Bit time
t_{n + 1}
t_{n + 8}
Rev.4.00, May 10, 2006, page 5 of 7