MC74ACT157DR2G

Overview

The MC74ACT157DR2G is a high-speed quad 2-input multiplexer manufactured by onsemi. 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 within a supply voltage range of 4.5 V to 5.5 V. It features TTL-compatible inputs and outputs capable of sourcing or sinking 24 mA. Propagation delays are specified at 9.0 ns maximum for S-to-Zn transitions and 8.5 ns for En-to-Zn transitions at 5.0 V.

Feature Summary

• Features TTL-compatible inputs for direct interfacing with standard logic families
• Provides high drive capability with outputs sourcing and sinking 24 mA
• Functions as a quad 2-input multiplexer or a function generator

Applications

• Moving data between two groups of registers to common output buses
• Implementing gating functions via variable selection
• General-purpose digital signal routing

Procurement Notes

Verify that the ordering suffix DR2G corresponds to the SOIC-16 package and tape-and-reel shipping configuration. Confirm the ACT series designation ensures TTL input compatibility rather than AC logic levels. Ensure the procurement documentation explicitly states lead-free compliance for environmental standards.

Selection Notes

Select this component when TTL input thresholds are required alongside CMOS drive strength. The ACT series provides faster switching speeds compared to standard HC logic while maintaining compatibility with 5 V systems. Verify that the 24 mA output current meets the load requirements of the destination circuitry without exceeding thermal limits.

Part Context

This part belongs to the MC74AC(T)157 family of quad multiplexers. It shares functional similarities with the MC74AC157 but differs in input threshold specifications. The ACT variant is optimized for 5 V operation with specific voltage level requirements for logic high and low states defined by the manufacturer.

Replacement Considerations

MC74AC157DR2G serves as a logical alternative if TTL input compatibility is not strictly required. Other members of the 74AC(T)157 family may offer different packaging options such as TSSOP-16.