MM74HC589SJ

Shift Registers Overview

The MM74HC589SJ is an 8-bit serial or parallel-input/serial-output shift register featuring three-state outputs, manufactured by Fairchild Semiconductor. It operates within a supply voltage range of 2V to 6V and supports a wide operating temperature range from -40°C to +85°C. The device integrates an 8-bit storage latch that feeds parallel data into the shift register, allowing for flexible data loading via serial or parallel inputs. Designed with high-performance silicon-gate CMOS technology, it provides low input current and high noise immunity, making it suitable for bus-oriented systems.

Shift Registers Feature Summary

• Integrates an 8-bit storage latch feeding an 8-bit shift register for versatile data handling
• Features three-state serial output (QH) compatible with bus-oriented system architectures
• Supports both serial and parallel data loading modes for flexible interface configurations
• Provides direct interfacing capability with standard CMOS, NMOS, and TTL logic families

Shift Registers Applications

• Bus-oriented digital systems requiring serial-to-parallel conversion
• Direct interfacing with Motorola SPI serial data ports on CMOS microprocessors
• Data storage and shifting applications in industrial control environments
• Parallel data acquisition systems utilizing serial output transmission

Shift Registers Procurement Notes

Verify component authenticity through authorized distribution channels due to potential availability constraints. Confirm package specifications match design requirements, as surface-mount variants may differ from through-hole equivalents. Check for RoHS compliance status if environmental regulations apply to the target assembly. Ensure supply chain stability given the component's age and potential obsolescence risks associated with legacy logic families.

Shift Registers Selection Notes

Select this component when designing systems requiring an 8-bit shift register with tri-state output capabilities. Ensure the application voltage remains within the 2V to 6V operational range for optimal performance. Consider the -40°C to +85°C temperature rating for industrial or commercial environments. Verify compatibility with existing logic levels, particularly if interfacing with LSTTL outputs requiring pull-up resistors.

Shift Registers Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices, originally developed by Motorola and later produced under Fairchild Semiconductor branding. The HC589 shares functional similarities with other shift registers like the HC597 but distinguishes itself through its three-state output capability. It represents a standard solution for serial data transmission in legacy and embedded systems designed during the era of widespread CMOS adoption.

Shift Registers Replacement Considerations

The MC54/74HC589 serves as the primary equivalent part number. Designers should verify pinout compatibility and electrical characteristics before substitution. Alternative logic families may require level shifting or voltage adjustment due to differing input/output thresholds.