SN74HC259ANSR

Overview

The SN74HC259ANSR is an 8-bit addressable latch from the Texas Instruments HC logic family, housed in a 16-pin SOIC package. It operates on a supply voltage range of 2 V to 6 V with a recommended operating temperature of -40°C to +85°C. Key electrical parameters include a maximum propagation delay of 33 ns at 4.5 V and 28 ns at 6 V, a low-level output current of 5.2 mA, and a high-level output current of -5.2 mA. The device features a typical power dissipation capacitance of 33 pF per latch and a maximum static supply current of 80 µA.

Feature Summary

• Performs serial-to-parallel conversion by storing single-line data across eight individually addressable latches.
• Functions as a 1-of-8 decoder or demultiplexer with active-high outputs for signal routing.
• Includes asynchronous parallel clear functionality to reset all outputs simultaneously.

Applications

• General-purpose storage registers in digital systems
• Serial-holding registers for data buffering
• Active-high decoders or demultiplexers

Procurement Notes

Verify that the ordering suffix 'ANSR' corresponds to the specific SOIC-16 tape-and-reel configuration required for surface-mount assembly. Confirm the RoHS status and lead finish details against the latest TI Package Option Addendum to ensure compliance with manufacturing standards. Cross-reference the manufacturer part number with distributor catalogs to validate availability and authenticity before finalizing procurement orders.

Selection Notes

Select this component when designing circuits requiring 8-bit data storage or decoding within the HC logic family constraints. Ensure the system voltage remains between 2 V and 6 V to maintain specified switching characteristics. Consider the 33 ns maximum propagation delay at lower voltages when determining timing margins for high-speed serial-to-parallel conversion tasks.

Part Context

This device belongs to the SNx4HC259 series of 8-bit addressable latches manufactured by Texas Instruments. The HC series utilizes high-speed CMOS technology to provide performance comparable to LS-TTL while consuming significantly less power. The SN74 variant is rated for commercial temperature ranges, distinguishing it from the SN54 military-grade counterpart.

Replacement Considerations

SN74HC259N (PDIP), SN74HC259PWR (TSSOP), SN74HC259DR (SOIC)