MC74HC589A

Updated: 2026-09-15

Overview

The MC74HC589A is a high-performance 8-bit shift register with input latches, designed for serial-to-parallel data conversion in digital circuits. It belongs to the HC (High-Speed CMOS) family, offering a balance of speed and power efficiency. This IC is commonly used in applications requiring data storage, signal processing, or interface expansion. As a surface-mount device (SMD), the MC74HC589A is compatible with automated assembly processes, making it suitable for high-volume production. Its robust design ensures reliable operation in industrial environments, with typical applications including LED displays, keyboard encoders, and communication systems.

Structure and Working Principle

The MC74HC589A integrates an 8-bit latch and an 8-bit shift register into a single package. Data is loaded into the latch in parallel and then shifted out serially via the output pin. A clock signal controls the shifting operation, while a separate latch enable signal manages data loading. The IC operates on a supply voltage range of 2V to 6V, with typical propagation delays of 13 ns at 5V. It features tri-state outputs, allowing multiple devices to share a common bus. The internal architecture ensures minimal power consumption, with a typical standby current of just a few microamps.

Key Features

The MC74HC589A offers several advantages for digital design. Its high-speed operation (up to 25 MHz clock frequency) makes it suitable for time-critical applications. The CMOS technology provides low power consumption, with typical ICC values under 10 μA in static conditions. Additional features include TTL-compatible input levels, allowing direct interface with both CMOS and TTL logic families. The device's wide operating voltage range (2-6V) provides design flexibility, while its robust output drive capability (±6 mA at 5V) ensures signal integrity in noisy environments.

Application Areas

This IC finds extensive use in various digital systems. In industrial automation, it's employed for sensor data acquisition and control signal distribution. Consumer electronics applications include remote controls and display drivers, where its serial interface reduces wiring complexity. The MC74HC589A is also popular in embedded systems for GPIO expansion and data logging. Its ability to convert between serial and parallel formats makes it valuable in communication interfaces, particularly where space constraints favor serial connections over parallel buses.

Maintenance and Precautions

Proper handling is essential for optimal performance. Always use ESD protection when working with the MC74HC589A, as CMOS devices are sensitive to static discharge. Avoid exceeding the absolute maximum ratings, particularly the supply voltage (7V) and input voltage range (VCC + 0.5V). For reliable operation, ensure proper decoupling with a 0.1 μF ceramic capacitor close to the power pins. When designing with multiple shift registers, consider signal integrity measures such as termination resistors for long traces. Thermal management is generally not required due to the device's low power dissipation.

B2B Procurement Guide

When sourcing the MC74HC589A, verify the manufacturer's authenticity to avoid counterfeit parts. Common packaging options include SOIC-16 and TSSOP-16, with reel packaging preferred for automated assembly. Lead times typically range from 4-8 weeks for standard orders. Consider environmental specifications such as operating temperature range (-40°C to +85°C for industrial grade) and RoHS compliance for regulatory requirements. For prototype quantities, distributors like Digi-Key or Mouser offer reliable supply, while volume purchases may warrant direct manufacturer engagement for better pricing.