SN74ALS259DRE4

Overview

The SN74ALS259DRE4 is an 8-bit addressable latch from the Texas Instruments ALS logic family, housed in a 16-pin Small-Outline (SOIC) package. It operates on a supply voltage ranging from 4.5 V to 5.5 V and supports a commercial temperature range of 0°C to 70°C. The device features asynchronous parallel clear, active-high outputs, and four distinct functional modes: addressable latch, memory, demultiplexer, and clear. Key electrical characteristics include a low-level output current of up to 8 mA and propagation delays between 2 ns and 26 ns depending on the input-to-output path.

Feature Summary

• Provides eight individually addressable latches for serial-to-parallel data conversion and storage
• Supports four operational modes including memory hold and one-of-eight decoding
• Features active-high outputs and an asynchronous parallel clear function
• Includes enable/disable inputs to facilitate system expansion

Applications

• General-purpose digital storage registers
• Serial-holding registers
• Active-high decoders or demultiplexers

Procurement Notes

Verify that the ordering suffix 'E4' corresponds to lead-free packaging and RoHS compliance as indicated in TI documentation. Confirm the SOIC package type matches the required PCB footprint. Ensure the component status aligns with long-term availability requirements, as legacy logic families may have specific lifecycle statuses.

Selection Notes

Select this component when designing systems requiring addressable storage or decoding within standard TTL voltage ranges. The ALS series offers a balance of speed and power consumption suitable for general-purpose applications. Verify that the 0°C to 70°C operating temperature range meets the environmental conditions of the target deployment.

Part Context

This part belongs to the Texas Instruments SN74ALS259 series of 8-bit addressable latches. It is the commercial-grade version of the SN54ALS259, which supports military temperature specifications. The device is designed for multifunctional use in digital systems, serving as both a storage register and a decoder/demultiplexer.

Replacement Considerations

Direct substitutes include the SN74ALS259DR and SN74ALS259N. Cross-family replacements such as the SN74HC259NE4 are available but differ in voltage range and switching characteristics.