SN74HCS259QPWRQ1

Overview

The SN74HCS259QPWRQ1 is an automotive-grade, 8-bit addressable latch from Texas Instruments' HCS logic family. It operates within a supply voltage range of 2 V to 6 V and supports an ambient 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 current at 6 V. It includes a low-power design with typical supply current of 100 nA and input leakage of ±100 nA. Packaged in a 16-pin TSSOP, it provides eight active-high outputs controlled by three address select lines.

Feature Summary

• Schmitt-trigger inputs provide high noise immunity and support slow or noisy signal transitions.
• Balanced CMOS push-pull outputs deliver strong drive capability for reliable data transmission.
• Low power consumption ensures minimal static current draw during operation.
• AEC-Q100 qualified for robust performance in demanding automotive environments.

Applications

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

Procurement Notes

Verify the specific package variant against the datasheet orderable addendum, as the SN74HCS259-Q1 series includes multiple options such as TSSOP, SOIC, and wettable flank QFN. Confirm that the selected part matches the required thermal and electrical specifications for your target operating conditions. Ensure compliance with AEC-Q100 standards if deploying in automotive contexts.

Selection Notes

Select this component when designing systems requiring general-purpose storage, working registers, or serial-holding registers. It is suitable for active-high decoders or demultiplexers where single-line data must be stored in eight addressable latches. Consider its wide voltage range and Schmitt-trigger inputs for applications involving noisy environments or slow input signals.

Part Context

This device belongs to the SN74HCS259-Q1 family of automotive addressable latches. It shares functional similarities with other members of the HCS logic family but is specifically optimized for automotive reliability. The 'Q1' suffix indicates qualification for automotive applications, while the base model number defines the 8-bit latch functionality.

Replacement Considerations

Consult the manufacturer's documentation for direct pin-compatible alternatives within the SN74HCS259-Q1 family. Verify that any substitute maintains the same voltage range, output drive capabilities, and Schmitt-trigger input characteristics to ensure system compatibility.

FAQ

What are the four distinct modes of operation for this device?

The device supports Addressable-latch mode (CLR=HIGH, G=LOW), Memory mode (CLR=HIGH, G=HIGH), 1-of-8 decoding/demultiplexing mode (CLR=LOW, G=LOW), and Clear mode (CLR=LOW, G=HIGH).

How does the device handle unused inputs?

Unused inputs must not be left floating; they should be terminated to either VCC or ground using pull-up or pull-down resistors to prevent undefined operational states.

What is the recommended capacitive load for optimal performance?

The device can drive a load with a total capacitance less than or equal to 50 pF while meeting all datasheet specifications.