SN74HCS259DR

Overview

The SN74HCS259DR is an 8-bit addressable latch from the Texas Instruments SN74HCS series, housed in a 16-pin SOIC package. It operates on a supply voltage of 2 V to 6 V with an extended temperature range of –40°C to +125°C. The device features Schmitt-trigger inputs for noise tolerance and balanced CMOS push-pull outputs capable of ±7.8 mA drive at 6 V. Propagation delays range from 6 ns to 55 ns depending on voltage and path.

Feature Summary

• Schmitt-trigger inputs provide high noise immunity and support slow input signal transitions
• Balanced CMOS push-pull outputs deliver equal sourcing and sinking current capabilities
• Low power consumption with typical supply current of 100 nA and input leakage of ±100 nA

Applications

• Memory device selection with shared data bus
• Reducing required number of outputs for chip select applications
• Routing data within digital systems

Procurement Notes

Verify the specific ordering suffix 'DR' corresponds to the SOIC-16 package and tape-and-reel shipping configuration. Confirm that the component meets RoHS compliance standards as indicated by the manufacturer's production data. Ensure the procurement channel provides valid traceability documentation for the SN74HCS series logic family.

Selection Notes

Select this component when design requirements include robust noise rejection via Schmitt-trigger inputs or operation across wide voltage ranges from 2 V to 6 V. The SOIC-16 surface-mount package facilitates automated assembly. Consider the extended temperature rating for environments exceeding standard commercial limits.

Part Context

This part belongs to the SN74HCS logic family, which integrates HCMOS performance with low power consumption and Schmitt-trigger functionality. The SN74HC259 serves as the standard counterpart without Schmitt triggers, while the SN74HCS259 variant specifically targets noisy environments requiring enhanced input hysteresis.

Replacement Considerations

The SN74HC259D offers equivalent logical functionality but lacks Schmitt-trigger inputs. Verify if the application environment requires the specific noise immunity provided by the HCS series before substituting.