SN74ACT7803-40DLR

FIFOs Memory Overview

The SN74ACT7803-40DLR is a 512-word by 18-bit synchronous FIFO memory manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports data rates up to 25 MHz with a maximum access time of 20 ns. The device utilizes Low-Power Advanced CMOS technology and features independent read and write clocks that can be asynchronous or coincident. It includes programmable almost-full/almost-empty flags, half-full flag, and input/output ready indicators. The component is packaged in a 56-pin shrink small-outline package (SSOP) and is characterized for operation from 0°C to 70°C.

FIFOs Memory Feature Summary

• Supports bidirectional configuration and word-width expansion without additional logic
• Features patented output edge control circuitry to dampen simultaneous switching noise
• Allows programming of depth-offset values for almost-full/almost-empty flags
• Includes asynchronous reset capability synchronized to independent system clocks

FIFOs Memory Applications

• Buffering asynchronous datapaths
• Clock domain crossing applications
• Data rate matching between systems

FIFOs Memory Procurement Notes

Verify the specific suffix 'DLR' against official documentation to confirm tape-and-reel packaging versus tube delivery. Confirm the '-40' speed grade corresponds to the 25 MHz maximum clock frequency specification. Ensure the SSOP-56 package dimensions match the target PCB footprint requirements. Check current production status as legacy ACT series components may have availability constraints.

FIFOs Memory Selection Notes

Select this component when an 18-bit wide synchronous FIFO buffer is required for moderate-speed data paths. The -40 speed grade provides a 25 MHz operational limit suitable for standard bus interfaces. Consider the bidirectional expansion capability if multiple devices are needed for wider data buses. Verify power supply stability within the 4.5 V to 5.5 V range to ensure proper logic level compatibility.

FIFOs Memory Part Context

This part belongs to the Widebus family of high-performance FIFO memories from Texas Instruments. It shares pinout compatibility with related models such as the SN74ACT7805 and SN74ACT7813, facilitating design reuse across different memory depths or widths. The device represents the advanced CMOS implementation of the classic 74-series logic architecture.

FIFOs Memory Replacement Considerations

Pin-compatible alternatives include the SN74ACT7805 and SN74ACT7813. Verify functional equivalence regarding clock synchronization and flag outputs before substitution.