SN74AS298AN

Overview

The SN74AS298AN is a quadruple 2-input multiplexer with storage, combining the functionality of two MSI functions in a single 16-pin package. It selects between two 4-bit data sources and synchronously stores data on the negative-going edge of the clock pulse. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum clock frequency of 62 MHz. Propagation delays from CLK to Q range from 1 ns to 11 ns. It features TTL inputs and outputs, with low-level output current capability of 20 mA.

Feature Summary

• Integrates dual 4-bit multiplexing and synchronous storage capabilities into a single component
• Selects between two independent 4-bit data words based on the word-select input level
• Stores selected data at the output terminals triggered by the negative-going clock edge
• Supports versatile shift register configurations including compound left-right shifting

Applications

• Dual source for operands and constants in arithmetic processors
• Implementing separate registers capable of parallel exchange of contents
• Universal-type register implementation for various shift patterns

Procurement Notes

Verify the specific ordering suffix to confirm the package type, as the SN74AS298A series includes both SOIC (D) and PDIP (N) options. Ensure the required operating temperature range aligns with the commercial specification of 0°C to 70°C. Confirm RoHS compliance status and lead finish details against the latest manufacturer packaging addendum before finalizing procurement specifications.

Selection Notes

Select this component when design requirements necessitate combining multiplexing and latching functions to reduce component count. It serves as an equivalent functional replacement for using separate SN74AS157 and SN74AS175A devices. Consider the 16-pin package constraint and ensure the system clock frequency does not exceed the specified maximum limit for reliable operation.

Part Context

This part belongs to the Texas Instruments SN74AS logic family, known for high-speed performance compared to standard TTL. The 'AN' suffix specifically denotes the plastic DIP package variant. It is designed for applications requiring fast data selection and storage within digital systems, offering a compact solution for complex logic routing tasks.

Replacement Considerations

SN74AS298AD