74HC7403D,518

FIFOs Memory Overview

The NXP USA Inc. 74HC7403D,518 is a high-speed Si-gate CMOS expandable First-In First-Out (FIFO) memory organized as 64 words by 4 bits. It operates within a supply voltage range of 2.0 V to 6.0 V and supports ambient temperatures from -40 °C to +125 °C. The device features synchronous or asynchronous operation with separate shift-in and shift-out controls, enabling independent reading and writing. It includes data-in-ready (DIR) and data-out-ready (DOR) status flags, an asynchronous master-reset input, and 3-state outputs compliant with JEDEC standard JESD7A.

FIFOs Memory Feature Summary

• Expandable architecture allowing parallel and serial cascading for increased word and bit dimensions
• Independent shift-in and shift-out controls supporting both synchronous and asynchronous data transfers
• Integrated DIR and DOR status flags indicating input and output stage readiness
• Input clamp diodes permitting interface to voltages exceeding VCC using current limiting resistors

FIFOs Memory Applications

• High-speed disc or tape controllers
• Communications buffers
• Data rate matching between asynchronous systems

FIFOs Memory Procurement Notes

Verify the ordering suffix '518' against official NXP documentation to confirm specific packaging details, such as reel size or tape width, as these variations do not alter the functional logic. Ensure the component meets RoHS compliance requirements for your assembly process. Cross-reference the SO16 package code SOT109-1 to match physical footprint constraints on the target printed circuit board layout.

FIFOs Memory Selection Notes

Select this component when a 4-bit wide, 64-word deep FIFO buffer is required for high-speed data handling. The HC series offers CMOS input levels suitable for general-purpose digital interfaces. Consider the HCT variant if TTL-level inputs are necessary for direct compatibility with legacy logic families. Verify that the operating temperature range of -40 °C to +125 °C aligns with the environmental conditions of the final application.

FIFOs Memory Part Context

This device belongs to the 74HC/HCT7403 family of expandable FIFO registers manufactured by NXP Semiconductors. It is part of the broader 74-series logic product line designed for high-speed applications. The specific model utilizes a plastic small outline package (SO16) with a body width of 3.9 mm, designated by package code SOT109-1 in the manufacturer's catalog.

FIFOs Memory Replacement Considerations

The datasheet lists the 74HCT7403D as a compatible alternative within the same family, differing primarily in input voltage levels.