SN74LS122DRE4

Overview

The SN74LS122DRE4 is a retriggerable monostable multivibrator manufactured by Texas Instruments. It operates within the LS logic series and contains one element per chip. The device features a propagation delay of 28 ns and supports a supply voltage range of 4.75 V to 5.25 V. It provides a low-level output current of 8 mA and a high-level output current of -400 µA. The component is housed in a 14-SOIC package with a maximum power supply current of 6 mA. It functions reliably across an operating temperature range from 0°C to +70°C.

Feature Summary

• Retriggerable monostable operation allows pulse width extension upon receiving subsequent trigger signals during the timing interval.
• Provides precise timing control with a specified propagation delay for digital signal processing applications.
• Designed for surface-mount installation using a standard 14-pin SOIC package format.

Applications

• Pulse generation circuits requiring adjustable duration
• Timing delay elements in digital systems
• Debouncing switches or contacts

Procurement Notes

Verify the specific suffix DRE4 against the target design requirements, as it indicates tape-and-reel packaging. Confirm that the 14-SOIC footprint matches the PCB layout constraints. Ensure the operating environment remains within the specified 0°C to +70°C temperature range. Check RoHS3 compliance status if environmental regulations apply to the final assembly. Validate that the 5V supply voltage aligns with the system's power distribution network.

Selection Notes

Select this component when a single retriggerable monostable circuit is required in a surface-mount configuration. The LS series offers standard compatibility with existing TTL logic families. Consider the 28 ns propagation delay for timing-sensitive designs. The 14-SOIC package facilitates automated assembly processes. Verify that the 8 mA sink current capability meets the load requirements of the connected circuitry.

Part Context

This part belongs to the SN74LS122 family of monostable multivibrators. It shares functional characteristics with other devices in the SN54/74(LS)122/23/30 series. The DRE4 designation specifically denotes the reel packaging variant produced by Texas Instruments. It serves as a specialized timing solution within the broader LSTTL logic product line.

Replacement Considerations

SN74LS122DR is listed as a manufacturer recommended alternative.

FAQ

Is the SN74LS122DRE4 retriggerable?

Yes, the datasheet identifies it as a retriggerable monostable multivibrator.

What is the package type for this component?

It is available in a 14-SOIC surface-mount package.