SN74ALS165 Datasheet, PDF (1/12 Pages) Texas Instruments – PARALLEL-LOAD 8-BIT REGISTERS

SN54ALS165, SN74ALS165
PARALLEL-LOAD 8-BIT REGISTERS
SDAS157B – JUNE 1982 – REVISED DECEMBER 1994
• Complementary Outputs
• Direct Overriding Load (Data) Inputs
• Gated Clock Inputs
• Parallel-to-Serial Data Conversion
• Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
description
The ′ALS165 are parallel-load 8-bit serial shift
registers that, when clocked, shift the data toward
serial (Q_H and Q_H) outputs. Parallel-in access to
each stage is provided by eight individual direct
data (A– H) inputs that are enabled by a low level
at the shift/load (SH/LD) input. The ′ALS165 have
a clock-inhibit function and complemented serial
outputs.
Clocking is accomplished by a low-to-high
transition of the clock (CLK) input while SH/LD is
held high and the clock inhibit (CLK INH) input is
held low. The functions of CLK and CLK INH are
interchangeable. Since a low CLK and a
low-to-high transition of CLK INH also
accomplishes clocking, CLK INH should be
changed to the high level only while CLK is high.
Parallel loading is inhibited when SH/LD is held
high. The parallel inputs to the register are
enabled while SH/LD is low independently of the
levels of the CLK, CLK INH, or serial (SER) inputs.
SN54ALS165 . . . J PACKAGE
SN74ALS165 . . . D OR N PACKAGE
(TOP VIEW)
SH/LD 1
CLK 2
E3
F4
G5
H6
Q_H 7
GND 8
16 V_CC
15 CLK INH
14 D
13 C
12 B
11 A
10 SER
9 Q_H
SN54ALS165 . . . FK PACKAGE
(TOP VIEW)
3 2 1 20 19
E4
18 D
F5
17 C
NC 6
16 NC
G7
15 B
H8
14 _A
9 10 11 12 13
NC – No internal connection
The SN54ALS165 is characterized for operation over the full military temperature range of – 55°C to 125°C. The
SN74ALS165 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
FUNCTION
SH/LD CLK CLK INH
L
X
X
Parallel load
H
H
X
No change
H
X
H
No change
H
L
↑
Shift†
H
↑
L
Shift†
† _{Shift = content of each internal register shifts}
toward serial outputs. Data at SER is shifted
into first register.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright © 1994, Texas Instruments Incorporated
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