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HD74HC95 Datasheet

  • HD74HC95

  • 4-bit Parallel Access Shift Register

  • 8頁

  • HITACHI

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HD74HC95
4-bit Parallel Access Shift Register
Description
This 4-bit register features parallel and serial inputs, parallel outputs, mode control, and two clock inputs.
The register has three mode operation:
鈥?/div>
Parallel (broadside) load
鈥?/div>
Shift right (the direction Q
A
toward Q
D
)
鈥?/div>
Shift left (the direction Q
D
toward Q
A
)
Parallel loading is accomplished by applying the four bits of data and taking the mode conrol input high.
The data is loaded into the associated flip-flops and appears at the outputs after the high-to-low transition of
the clock-2 input. During loading, the entry of serial data is inhibited. Shift right is accomplished on the
high-to-low transition of clock-1 when the mode control is low; shift left is accomplished on the high-to-
low transition of clock-2 when the mode control is high by connecting the output of each flip-flop (Q
D
to
input C, etc.) and serial data is entered at input D. The clock input may be applied commonly to clock-1
and clock-2 if both modes can be clocked from the same source. Changes at the mode control input should
normally be made while both clock inputs are low: however, conditions described in the last three lines of
the function table will also ensure that register contents are protected.
Features
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鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
High Speed Operation: t
pd
(Clock to Q) = 17 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 碌A max
Low Quiescent Supply Current: I
CC
(static) = 4 碌A max (Ta = 25擄C)

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