SN74HC157NSR

Overview

The SN74HC157NSR is a quadruple 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 2V to 6V and supports an operating temperature from -40°C to 85°C. The device features four independent multiplexers controlled by a common address select (A/B) input and an active-low strobe (G) input. Electrical characteristics include a maximum low-level output current of 7.8mA at 6V, a typical propagation delay of 11ns at 6V with 50pF load, and a maximum static supply current of 160µA.

Feature Summary

• Contains four independent 2-to-1 multiplexers sharing a single address select input for synchronized channel selection.
• Features TTL-compatible CMOS inputs that interface directly with standard logic families without level shifting.
• Includes an active-low strobe input that forces all outputs to a low state regardless of address or data inputs.

Applications

• Routing a 4-bit data bus between two source devices in system controllers.
• Multiplexing multiple data sources into a single processing line.
• Data switching applications requiring synchronous control of parallel channels.

Procurement Notes

Verify the package type matches the SOP-16 designation and confirm the suffix 'SR' indicates tape and reel packaging. Ensure the operating temperature range meets the specific environmental requirements of the target application. Cross-reference the manufacturer part number against the latest orderable information to confirm production status and availability.

Selection Notes

Select this component when a quadruple 2-to-1 multiplexer is required with a wide supply voltage range. It is suitable for designs needing TTL-compatible inputs and low power consumption. Consider the SOP-16 package constraints and thermal resistance values if high-density mounting is necessary. Verify that the capacitive load does not exceed specifications to maintain signal integrity.

Part Context

This device belongs to the SNx4HC157 family of high-speed silicon gate CMOS multiplexers. It provides a cost-effective solution for data routing compared to discrete logic implementations. The HC series offers improved speed and lower power consumption relative to older logic families while maintaining compatibility with existing system architectures.

Replacement Considerations

SN74HC157DR

FAQ

How does the strobe input affect the outputs?

When the strobe (G) input is high, it forces all four Y outputs to a low state, overriding the address select and data inputs.

What happens to unused inputs?

Unused inputs must be terminated to either VCC or ground to prevent excessive power consumption and oscillations caused by floating CMOS inputs.