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SN74HC166DTE4 датащи(PDF) 2 Page - Texas Instruments

номер детали SN74HC166DTE4
подробное описание детали  8-BIT PARALLEL-LOAD SHIFT REGISTERS
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производитель  TI [Texas Instruments]
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SN74HC166DTE4 датащи(HTML) 2 Page - Texas Instruments

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SN54HC166, SN74HC166
8BIT PARALLELLOAD SHIFT REGISTERS
SCLS117D − DECEMBER 1982 − REVISED SEPTEMBER 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
These parallel-in or serial-in, serial-out registers feature gated clock (CLK, CLK INH) inputs and an overriding
clear (CLR) input. The parallel-in or serial-in modes are established by the shift/ load (SH/LD) input. When high,
SH/LD enables the serial (SER) data input and couples the eight flip-flops for serial shifting with each clock
(CLK) pulse. When low, the parallel (broadside) data inputs are enabled, and synchronous loading occurs on
the next clock pulse. During parallel loading, serial data flow is inhibited. Clocking is accomplished on the
low-to-high-level edge of CLK through a 2-input positive-NOR gate, permitting one input to be used as a
clock-enable or clock-inhibit function. Holding either CLK or CLK INH high inhibits clocking; holding either low
enables the other clock input. This allows the system clock to be free running, and the register can be stopped
on command with the other clock input. CLK INH should be changed to the high level only when CLK is high.
CLR overrides all other inputs, including CLK, and resets all flip-flops to zero.
FUNCTION TABLE
INPUTS
OUTPUTS
INPUTS
INTERNAL
CLR
SH/LD
CLK INH
CLK
SER
PARALLEL
A...H
QA
QB
QH
L
X
X
X
X
X
L
L
L
H
XL
L
X
X
QA0
QB0
QH0
H
LL
X
a ...h
a
bh
H
HL
HX
H
QAn
QGn
H
HL
LX
L
QAn
QGn
H
X
H
X
X
QA0
QB0
QH0
logic diagram (positive logic)
1D
C1
15
9
7
6
13
SH/LD
CLR
CLK
CLK INH
QH
234
5
10
11
12
14
SER
AB
CD
E
F
G
H
R
1D
C1
R
1D
C1
R
1D
C1
R
1D
C1
R
1D
C1
R
1D
C1
R
1D
C1
R
1
Pin numbers shown are for the D, DB, J, N, NS, PW, and W packages.


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