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HD74HC166 Datasheet(PDF) 1 Page - Hitachi Semiconductor

Part No. HD74HC166
Description  Parallel-load 8-bit Shift Register
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Maker  HITACHI [Hitachi Semiconductor]
Homepage  http://www.renesas.com/eng
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HD74HC166 Datasheet(HTML) 1 Page - Hitachi Semiconductor

 
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HD74HC166
Parallel-load 8-bit Shift Register
Description
This device is an 8-bit shift register with an output from the last stage. Data may be loaded into the register
either in parallel or in serial form. When the Shift/Load input is low, the data is loaded asynchronously in
parallel. When the Shift/Load input is high, the data is loaded serially on the rising edge of either clock
inhibit or Clock. Clear is asynchronous and active-low.
The 2-input NOR clock may be used either by combining two independent clock sources or by designating
one of the clock inputs to act as a clock inhibit.
Features
• High Speed Operation: t
pd (Clock to QH) = 14 ns typ (CL = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: V
CC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: I
CC (static) = 4 µA max (Ta = 25°C)
Function Table
Inputs
Parallel
Internal Outputs
Output
Clear
Shift/Load
Clock Inhibit
Clock
Serial
A ··· H
Q
A
Q
B
Q
H
L
X
X
XXXL
L
L
H
X
L
L
XXQ
A0
Q
B0
Q
H0
HL
L
X
a ··· h
a
b
h
HH
L
HX
HQ
An
Q
Gn
HH
L
LX
LQ
An
Q
Gn
HX
H
XXQ
A0
Q
B0
Q
H0


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