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HD74HC674 Datasheet

  • HD74HC674

  • 16-bit Shift Register

  • 8頁

  • HITACHI

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HD74HC674
16-bit Shift Register
Description
The HD74HC674 is a 16-bit parallel-in, serial-out shift register. A three-state input/output (data I/O) port
provides access for entering serial data or reading the shift-register word in a recirculating loop.
The device has four basic modes of operation:
1. Hold (do nothing)
2. Write (serially via input/output)
3. Read (serially)
4. Load (parallel via data inputs)
Low-to-high-level changes at the chip select input should be made only when the clock input is low to
prevent false clocking.
Features
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High Speed Operation: t
pd
(CLK to SER/Q
15
) = 17 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 15 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 碌A(chǔ) max
Low Quiescent Supply Current: I
CC
(static) = 4 碌A(chǔ) max (Ta = 25擄C)
Function Table
Inputs
CS
H
L
L
L
R/W
X
L
H
H
Mode
X
X
L
H
CLK
X
SER/Q
15
Z
Z
Q
14n
P
15
Operation
Do nothing
Shift and write (serial load)
Shift and read
Parallel load

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