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SN74LS165A
  • SN74LS165A
  • SN74LS165A
  • SN74LS165A

SN74LS165A

ACTIVE

Serial-out shift registers

Texas Instruments SN74LS165A Product Info

1 April 2026 3

Parameters

Configuration

Parallel-in, Serial-out

Bits (#)

8

Technology family

LS

Supply voltage (min) (V)

4.75

Supply voltage (max) (V)

5.25

Input type

Bipolar

Output type

Push-Pull

Clock frequency (MHz)

25

IOL (max) (mA)

8

IOH (max) (mA)

-0.4

Supply current (max) (µA)

30000

Features

High speed (tpd 10-50ns)

Operating temperature range (°C)

0 to 70

Rating

Catalog

Package

PDIP (N)-16-181.42 mm² 19.3 x 9.4

Features

  • Complementary Outputs
  • Direct Overriding Load (Data) Inputs
  • Gated Clock Inputs
  • Parallel-to-Serial Data Conversion

The SN54165 and SN74165 devices are obsolete and are no longer supplied.

  • Complementary Outputs
  • Direct Overriding Load (Data) Inputs
  • Gated Clock Inputs
  • Parallel-to-Serial Data Conversion

The SN54165 and SN74165 devices are obsolete and are no longer supplied.

Description

The ’165 and ’LS165A are 8-bit serial shift registers that shift the data in the direction of QA toward QH when clocked. Parallel-in access to each stage is made available by eight individual, direct data inputs that are enabled by a low level at the shift/load (SH/LD) input. These registers also feature gated clock (CLK) inputs and complementary outputs from the eighth bit. All inputs are diode-clamped to minimize transmission-line effects, thereby simplifying system design.

Clocking is accomplished through a two-input positive-NOR gate, permitting one input to be used as a clock-inhibit function. Holding either of the clock inputs high inhibits clocking, and holding either clock input low with SH/LD high enables the other clock input. Clock inhibit (CLK INH) should be changed to the high level only while CLK is high. Parallel loading is inhibited as long as SH/LD is high. Data at the parallel inputs are loaded directly into the register while SH/LD is low, independently of the levels of CLK, CLK INH, or serial (SER) inputs.

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