SN74HCS264DR

Shift Registers Overview

The SN74HCS264DR is an 8-bit parallel-out serial shift register from the Texas Instruments HCS logic family, housed in a 16-pin SOIC package. 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 immunity and provides inverted outputs with balanced push-pull drive capability. Key electrical characteristics include a typical supply current of 100 nA, input leakage of ±100 nA, and output drive currents of ±7.8 mA at 6 V.

Shift Registers Feature Summary

• Incorporates Schmitt-trigger architecture on all inputs to provide high noise tolerance and eliminate transition rate requirements for slow signals.
• Features AND-gated dual serial inputs (A and B) that require both signals to be high to set the data line high before clocking.
• Provides balanced CMOS push-pull outputs capable of sourcing and sinking similar currents for robust signal driving.

Shift Registers Applications

• Output expansion for microcontroller systems
• LED matrix control circuits
• Seven-segment display control interfaces
• General-purpose 8-bit data storage applications

Shift Registers Procurement Notes

Verify the specific ordering suffix 'DR' corresponds to the SOIC-16 package variant when confirming procurement details. Ensure the component meets RoHS compliance standards as indicated in official documentation. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm availability and authenticity prior to purchase.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with inverted outputs and Schmitt-trigger inputs is required. It is suitable for environments with noisy signals or slow input transitions due to its hysteresis characteristics. Consider the SOIC-16 package constraints and the need for an asynchronous clear function when designing the circuit layout.

Shift Registers Part Context

This device belongs to the SN74HCS series, which combines HCMOS speed with low power consumption and wide voltage operation. Unlike standard HC devices, the HCS series includes Schmitt-trigger inputs for enhanced noise immunity. The SN74HCS264 specifically offers inverted outputs and dual serial inputs, distinguishing it from non-inverted or single-input variants in the same family.

Shift Registers Replacement Considerations

Consult the SN74HCS264 datasheet orderable addendum for officially confirmed substitute part numbers. Verify pin compatibility and logical equivalence before substituting any alternative components.

Shift Registers FAQ

How does the SN74HCS264 handle serial data input?

The device uses two serial inputs, A and B, connected through an internal AND gate. Data is stored in the first register only if both inputs are high during the rising edge of the clock signal.

What is the state of the outputs relative to the stored data?

The outputs are inverted from the data stored in the registers. For example, if a logic high is stored in a register, the corresponding output will be low.

Can the SN74HCS264 process slow input signals?

Yes, the Schmitt-trigger inputs provide hysteresis, making the device tolerant to slow or noisy input signals without requiring strict transition rate specifications.