SN74S373DWQ

Overview

The SN74S373DWQ is an octal D-type transparent latch from the Texas Instruments 74S series, housed in a 20-pin SOIC (DW) package. It features three-state bus-driving outputs designed for driving highly capacitive or low-impedance loads. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports a commercial operating temperature range of 0°C to 70°C. Key electrical characteristics include a typical propagation delay of 12 ns, a maximum clock frequency of 100 MHz, and output drive capabilities of up to 160 mA.

Feature Summary

• Features buffered control inputs with Schmitt-trigger hysteresis on the clock-enable line to improve AC and DC noise rejection.
• Utilizes P-N-P input structures to significantly reduce DC loading on data lines compared to standard TTL families.
• Provides high-impedance three-state outputs that allow direct connection to bus lines without requiring external interface or pullup components.

Applications

• Implementing buffer registers in digital systems
• Creating I/O ports for microprocessor interfaces
• Designing bidirectional bus drivers
• Constructing working registers for data storage

Procurement Notes

Verify the specific 'Q' suffix against official documentation to confirm if it denotes automotive qualification or a specific manufacturing lot code, as standard datasheets may not explicitly detail this variant's unique compliance status. Confirm availability through authorized distributors, as legacy logic families often have restricted production runs or obsolescence notices.

Selection Notes

Select this component when high-speed performance and robust noise immunity are required for bus-oriented systems. The 74S series offers faster switching speeds than LS counterparts but consumes more power. Ensure the design accommodates the higher current draw and thermal requirements associated with the S-series technology.

Part Context

This part belongs to the broader family of octal D-type latches and flip-flops, including LS and S variants. While the SN74LS373 shares similar functionality, the SN74S373 provides superior speed and noise rejection due to its Schottky transistor-clamped structure and buffered inputs, making it suitable for demanding high-frequency applications.

Replacement Considerations

SN74S373N