MC74AC157N

Overview

The MC74AC157N is a high-speed quad 2-input multiplexer manufactured by onsemi in a PDIP-16 package. It selects four bits of data from two sources using common Select and Enable inputs, presenting the selected data in true form. The device operates on a single power supply ranging from 2.0 V to 6.0 V. It features outputs capable of sourcing and sinking 24 mA. Propagation delays vary based on voltage and load; for instance, at 5.0 V with a 50 pF load, delays range from approximately 5.0 ns to 9.5 ns depending on the specific signal path.

Feature Summary

• Quad 2-input multiplexing functionality with common select and enable controls
• Outputs present selected data in non-inverted form
• Capable of functioning as a function generator for gating applications

Applications

• Moving data between two groups of registers to common output buses
• Implementing gating functions via function generation
• Selecting data sources in digital logic circuits

Procurement Notes

Verify the exact ordering suffix 'N' corresponds to the PDIP-16 package when sourcing. Confirm RoHS compliance status if required, noting that specific suffixes like 'G' denote lead-free packages while others may differ. Check current availability as distribution statuses change. Ensure the application environment stays within the specified -40°C to +85°C operating temperature range.

Selection Notes

Choose this component for applications requiring a quad 2-input multiplexer in a through-hole package. Consider the MC74ACT157 variant if TTL-compatible input thresholds are necessary instead of standard CMOS levels. Evaluate propagation delay requirements against the AC characteristics tables for your specific supply voltage and capacitive load conditions.

Part Context

This part belongs to the 74AC series of logic integrated circuits, specifically the MC74AC157 family. It is distinct from the MC74ACT157 which offers TTL-compatible inputs. The N suffix identifies the physical PDIP-16 housing, differentiating it from surface-mount options like SOIC or TSSOP variants available within the same logical product line.

Replacement Considerations

MC74ACT157N

FAQ

How does the Enable input affect the outputs?

When the Enable (E) input is HIGH, all outputs are forced LOW regardless of other inputs. When E is LOW, the device operates normally based on the Select input.

What is the difference between MC74AC157 and MC74ACT157?

The MC74ACT157 has TTL-compatible input voltage thresholds, whereas the MC74AC157 uses standard CMOS thresholds. Both share similar functional multiplexing capabilities.