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SN74HC165DR

8-bit parallel-load shift register, PISO, 2-6V, 24 MHz, SOIC-16

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Manufacturer Part：

SN74HC165DR

Package：

SOIC-16 (9.9 x 6.0 mm)

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Description

Product Overview

The SN74HC165DR is an 8-bit parallel-load shift register from Texas Instruments. When clocked, it shifts data toward a serial QH output. It features eight direct data inputs enabled by a low level at the shift/load input, a clock-inhibit function, and a complementary serial QH output, housed in a 16-pin SOIC package with wide -40C to +125C temperature range.

Key Specifications

Bits 8
Configuration Parallel-in, Serial-out
Supply Voltage 2V to 6V
Clock Frequency 24 MHz (HC at 5V)
Typical tpd 13 ns
Output Drive +/-5.2 mA at 5V
ICC (Max) 80 uA
Package SOIC-16 (9.9 x 6.0 mm)
Operating Temperature -40C to +125C

Features

  • Wide operating voltage range: 2V to 6V
  • Complementary serial outputs (QH and QH)
  • Direct overriding load (data) inputs
  • Gated clock inputs with clock-inhibit function
  • Low power consumption: 80 uA max ICC
  • Drives up to 10 LSTTL loads

Applications

  • Expanding microcontroller input pins
  • Parallel-to-serial data conversion
  • Keyboard and switch matrix scanning
  • Digital input expansion modules

The SN74HC165DR from Texas Instruments is an 8-bit parallel-load shift register designed for parallel-to-serial data conversion. Eight individual direct data (A-H) inputs are enabled by a low level at the shift/load (SH/LD) input, allowing asynchronous parallel data loading. When SH/LD is held high, data shifts toward the serial QH output on each rising clock edge. The device features a clock-inhibit (CLK INH) function and a complementary QH output, providing flexible interfacing options. With a wide operating voltage range of 2V to 6V and high noise immunity, it is ideal for expanding digital inputs in microcontroller-based systems.

The SN74HC165DR operates in two modes. When SH/LD is low, the eight parallel data inputs (A-H) are asynchronously loaded into the internal register, overriding any shift operation. When SH/LD is high and CLK INH is low, each rising edge of the CLK input shifts the register data one position toward the QH output, with the SER input filling the vacated position. The clock-inhibit (CLK INH) pin can prevent shifting when held high, and its function is interchangeable with CLK. The complementary QH output provides the inverse of the QH serial output. Multiple devices can be cascaded by connecting QH to the SER input of the next stage.

Pin Name Type Function
1 SH/LD Input Shift/Load control (low=load, high=shift)
2 CLK Input Clock input (rising edge triggered)
3-6 E,F,G,H Input Parallel data inputs E-H
7 QH Output Inverted serial output
8 GND Ground Ground reference
9 QH Output Serial output
10 SER Input Serial data input (for cascading)
11-14 A,B,C,D Input Parallel data inputs A-D
15 CLK INH Input Clock inhibit (active high)
16 VCC Power Supply voltage 2-6V
  • Expanding microcontroller digital input capability
  • Parallel-to-serial data conversion for communication
  • Keyboard, switch matrix, and DIP switch scanning
  • Cascaded input expansion for PLC and industrial I/O modules
  • LED display data serialization
Manufacturer Part Number Package Notes
TI SN74HC165N PDIP-16 Through-hole version
TI SN74HC165PWR TSSOP-16 Smaller TSSOP package
TI SN74HCT165DR SOIC-16 TTL-compatible inputs (4.5-5.5V)
NXP 74HC165D SOIC-16 Pin-compatible alternative
TI SN74HC165NSR SOP-16 Shrink SOP package
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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