MC74HC533AF

Latches Overview

The MC74HC533AF is an octal D-type transparent latch manufactured by onsemi, belonging to the 74HC logic series. It features eight independent D-type latches with tri-state outputs, housed in a 20-SOIC package. The device operates within a supply voltage range of 2V to 6V and supports a maximum clock frequency of 35 MHz at 6V. Key electrical parameters include a propagation delay of 17ns @ 6V/50pF, static current of 2µA, and output drive currents of 5.2mA for both high and low states. It functions reliably across a temperature range of -55°C to 125°C.

Latches Feature Summary

• Octal configuration providing eight independent D-type latches for parallel data storage
• Tri-state output capability allowing direct bus interfacing and system flexibility
• Transparent latch operation enabling data passage during active enable periods
• CMOS technology ensuring low static power consumption and high noise immunity

Latches Applications

• Parallel data storage in digital signal processing systems
• Bus interface circuits requiring tri-state isolation
• Memory address latching in microprocessor-based designs
• Data buffering for high-speed digital communication links

Latches Procurement Notes

Verify the specific suffix 'AF' against the official onsemi datasheet to confirm package dimensions and marking details. Ensure compatibility with existing PCB footprints for the 20-SOIC variant. Check for moisture sensitivity level requirements during assembly. Confirm RoHS compliance status for the specific manufacturing batch. Validate that the operating voltage range aligns with the target system's power supply specifications.

Latches Selection Notes

Select this component when an octal latch with tri-state outputs is required for parallel data handling. The HC series offers speed suitable for general-purpose digital applications up to 35 MHz. Consider the wide operating temperature range for industrial environments. Compare pinout compatibility with legacy 74HC533 designs if replacing existing circuitry. Evaluate power consumption benefits over bipolar alternatives for battery-operated devices.

Latches Part Context

This part belongs to onsemi's extensive 74HC logic family, known for CMOS performance compatible with TTL inputs. The MC74HC533AF specifically addresses needs for multi-bit data retention in complex digital systems. It complements other buffer and latch components in the same series, offering standardized functionality for designers building scalable digital architectures.

Latches Replacement Considerations

Direct substitutes include equivalent octal D-latches from other manufacturers such as SN74HC533 variants. Verify pin compatibility and electrical characteristics before substitution. Ensure the replacement maintains tri-state functionality and voltage levels.

Latches FAQ

What is the function of the tri-state outputs?

The tri-state outputs allow the latch to disconnect from the bus when disabled, preventing signal contention in shared data lines.

How does the transparent latch behavior work?

When the enable input is active, the output follows the input state immediately; when disabled, the last input state is held.