SN74LS256D

Latches Overview

The SN74LS256D is a dual 4-bit D-type latch manufactured by onsemi, belonging to the Low Power Schottky (LS) TTL logic family. It features two independent latches within a single package, providing temporary storage for binary information in digital systems. The device operates with a nominal supply voltage of 5 V and utilizes a 16-pin Small Outline (SOIC) surface-mount package. Key electrical characteristics include a maximum propagation delay of 30 ns at nominal supply and a maximum power supply current of 25 mA. The component supports an operating temperature range up to 70 °C and offers true outputs for each latch function.

Latches Feature Summary

• Dual independent 4-bit D-latch configuration for parallel data storage
• Low Power Schottky technology ensures high-speed operation with reduced power consumption
• Level-triggered enable mechanism allows data transfer when the control signal is active
• Surface-mount SOIC-16 packaging facilitates automated assembly and compact circuit board design

Latches Applications

• Temporary data storage between processing units and input/output interfaces
• Parallel-to-serial data conversion circuits
• Status register implementation in microprocessor-based systems
• Buffering signals for indicator units or display drivers

Latches Procurement Notes

Verify that the specific part number matches the required Low Power Schottky logic family specifications. Confirm the package type corresponds to the 16-pin Small Outline Integrated Circuit variant. Ensure the manufacturer designation aligns with onsemi requirements. Check compliance documentation against project standards, as this component may not meet all current environmental certifications. Validate pinout compatibility during integration planning.

Latches Selection Notes

Select this component when dual 4-bit latching functionality is required within a TTL-compatible system architecture. The LS series offers a balance of speed and power efficiency suitable for general-purpose digital logic applications. Consider the surface-mount package for designs prioritizing space optimization over through-hole mounting. Verify that the 5 V supply voltage aligns with the rest of the system's logic levels.

Latches Part Context

This device is part of the broader SN74LSxx series of logic integrated circuits produced by onsemi. These components are widely used in industrial and consumer electronics for basic digital logic operations. The SN74LS256D specifically addresses the need for multi-bit data retention without requiring multiple discrete latch chips, simplifying schematic design and reducing component count in complex digital assemblies.

Latches Replacement Considerations

Compatible substitutes include the SN74LS75, which provides dual 2-bit latches with complementary outputs. Other equivalents within the LS family may offer similar timing characteristics but differ in bit width or output configuration. Verify pin compatibility before substitution.