MM74HC589M

Shift Registers Overview

The MM74HC589M is an 8-bit shift register with input latches and a 3-state serial output, manufactured by onsemi. It utilizes advanced silicon-gate CMOS technology to provide high noise immunity and low power consumption while driving 15 LS-TTL loads. The device features a parallel storage latch feeding a parallel-in, serial-out shift register, with positive-edge triggered clocks for both registers. It operates within a supply voltage range of 2V to 6V and supports a guaranteed shift frequency up to 30 MHz at 5V.

Shift Registers Feature Summary

• Features an 8-bit parallel storage register that feeds data into an 8-bit shift register.
• Includes a 3-state serial output (QH) enabling wire-ORing of multiple devices on a bus.
• Supports direct overriding load via the SLOAD pin for flexible parallel or serial operations.
• Provides static protection through internal diode clamps connected to VCC and ground.

Shift Registers Applications

• Bus-oriented systems requiring serial data transmission
• Interfaces with SPI serial data ports on CMOS microprocessors
• Parallel-to-serial data conversion circuits

Shift Registers Procurement Notes

Verify the specific package variant, as the MM74HC589M denotes the SOIC package. Confirm RoHS compliance status and check for active manufacturing status, as legacy logic families may have limited availability or obsolescence notices from the manufacturer.

Shift Registers Selection Notes

Select this component when a combined storage latch and shift register is required in a single IC. Ensure the system voltage falls within the 2V to 6V range. Consider the 3-state output capability if bus sharing is necessary. Verify that the 30 MHz maximum operating frequency meets the system clock requirements.

Shift Registers Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices. It is functionally compatible with the standard 74LS logic family in terms of speed, function, and pin-out. The device is designed for general-purpose digital applications requiring reliable data shifting and storage capabilities.

Shift Registers Replacement Considerations

Direct replacements include other manufacturers' 74HC589 variants in SOIC packages. Verify pin compatibility and electrical characteristics such as propagation delay and output drive strength before substitution.