SN74LS122NSR

Overview

The SN74LS122NSR is a retriggerable monostable multivibrator manufactured by Texas Instruments, belonging to the SN74LS series. It features a single circuit in a 14-pin SOIC package. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports an operating temperature range of 0°C to +70°C. Key electrical parameters include a maximum propagation delay of 56 ns, a maximum power supply current of 6 mA, a low-level output current of 8 mA, and a high-level output current of -400 µA.

Feature Summary

• Retriggerable monostable multivibrator functionality allowing pulse width extension upon new trigger events
• Schmitt-trigger inputs for noise immunity and clean signal transitions
• Surface-mount SOIC-14 packaging suitable for automated assembly

Applications

• Timing and delay generation circuits
• Pulse width modulation and shaping
• Debouncing mechanical switches or contacts

Procurement Notes

Verify the specific suffix 'NSR' against the manufacturer's official datasheet to confirm package type and tape-and-reel specifications. Ensure the component meets RoHS compliance requirements for your target market. Cross-reference the part number with authorized distributors to confirm current availability and lead times, as manufacturing status may vary.

Selection Notes

Select this component when a single-channel, retriggerable timing solution is required within standard TTL logic families. Consider the 56 ns propagation delay and 8 mA drive capability for interface compatibility. Verify that the external RC timing components can achieve the desired pulse width within the specified voltage and temperature ranges.

Part Context

This part belongs to the SN74LS (Low-power Schottky) family, known for improved speed over standard LS logic while maintaining lower power consumption. The SN74LS122 specifically provides a retriggerable monostable function, distinguishing it from non-retriggerable variants like the SN74LS121.

Replacement Considerations

SN74LS122DR is listed as a manufacturer-recommended alternative.