Texas Instruments SN74ACT7204L15NP

Overview

SN74ACT7204L15NP from Texas Instruments is a 4096 × 9-bit asynchronous dual-port FIFO memory IC with TTL-compatible inputs, 15 ns data access time, and 40 MHz read/write operation - used as a rate-matching buffer between asynchronous buses in data-acquisition systems and communication queues.

For engineers reviewing the SN74ACT7204L15NP datasheet, SN74ACT7204L15NP pinout, SN74ACT7204L15NP application, or SN74ACT7204L15NP equivalent, key selection criteria include its 28-pin plastic DIP (NP) package, retransmit capability, empty/full/half-full status flags, and compatibility with IDT7204-based designs.

Technical Context

This FIFO implements independent read and write address counters on dual-port SRAM, enabling first-in-first-out data flow without external sequencing logic. It supports both asynchronous and coincident read/write operations, with automatic read/write modes triggered by EF/FF flag states.

Depth expansion across multiple devices uses daisy-chained XI/XO/HF signals, while width expansion connects parallel devices sharing R/W/RS/FL/RT controls. The FL/RT pin serves dual roles: first-load control in depth expansion or retransmit enable when XI = GND.

Key Specifications

Pinout & Package

SN74ACT7204L15NP is housed in a 28-pin plastic dual in-line package (DIP), designated NP, with 0.6-inch body width and standard through-hole footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FIFO memory applications.

Compared with IDT7204L15 and SN74ACT7204L25NP, SN74ACT7204L15NP delivers the fastest access (15 ns) in the family while maintaining full functional equivalence - making it optimal for high-speed rate-buffering where timing margin is critical.

Availability

SN74ACT7204L15NP is available at Aetrix Electronics and suitable for data-acquisition systems, serial communication interfaces, and magnetic storage controllers requiring stable component supply and long-term obsolescence management.

Supply support for SN74ACT7204L15NP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability interface and memory products.

The SN74ACT7204L15NP belongs to TI's ACT-family advanced CMOS FIFO series, engineered for robust 5-V bus interfacing in industrial data-path and protocol-bridge applications.

FAQ

What is the memory depth and width of the SN74ACT7204L15NP?

The SN74ACT7204L15NP provides a 4096-word deep by 9-bit wide FIFO structure. This configuration supports 4096 sequential data entries, each containing 8 data bits plus 1 parity or framing bit - essential for error detection and packet alignment in communication systems. Its organization is fixed and not programmable.

Does the SN74ACT7204L15NP support simultaneous read and write operations?

Yes, the SN74ACT7204L15NP supports fully asynchronous read and write operations - meaning R and W can be asserted independently and even coincidentally. Internal address counters track positions separately, preventing corruption. The device uses EF and FF flags to prevent underflow or overflow during concurrent access.

How does the retransmit function work on the SN74ACT7204L15NP?

The retransmit function is activated by pulsing FL/RT low while R and W are held high. This resets the internal read pointer to location zero without altering the write pointer, allowing previously read data to be replayed. It is only safe when fewer than 4096 writes have occurred since the last reset - otherwise unread data may be overwritten.

Can multiple SN74ACT7204L15NP devices be cascaded for greater depth?

Yes, SN74ACT7204L15NP devices support depth expansion via XI/XO/HF daisy-chaining. The first device has FL/RT grounded; subsequent devices tie FL/RT high and connect XO/HF to XI. External OR gates combine EF and FF outputs; RT and HF functions are disabled in expanded configurations.

What package type is used for the SN74ACT7204L15NP?

The SN74ACT7204L15NP uses a 28-pin plastic dual in-line package (DIP), designated NP. It features through-hole mounting with 0.6-inch body width and standard 0.1-inch pin pitch - compatible with manual soldering, socketing, and legacy PCB layouts designed for DIP components.