Texas Instruments SN74ACT7202LA25RJ

Overview

SN74ACT7202LA25RJ from Texas Instruments is a 1024 × 9-bit asynchronous dual-port FIFO memory IC with independent read/write operations, 15 ns access time, and 40 MHz read/write frequency capability. It features empty/full/half-full status flags, retransmit capability, and TTL-compatible inputs - deployed in data-acquisition systems as a rate-matching buffer between ADCs and host processors.

For engineers reviewing the SN74ACT7202LA25RJ datasheet, SN74ACT7202LA25RJ pinout, SN74ACT7202LA25RJ application, or SN74ACT7202LA25RJ equivalent, key selection considerations include its 32-pin plastic J-leaded chip-carrier (RJ) package, depth/width expansion support, asynchronous FIFO behavior, and compatibility with IDT7202-based designs.

Technical Context

The SN74ACT7202LA25RJ implements a dual-port SRAM-based FIFO with independent internal write and read address counters, enabling first-in-first-out data flow without external sequencing logic. Its architecture supports coincident or fully asynchronous read/write cycles, with status flag generation (EF, FF, XO/HF) directly tied to pointer arithmetic between write and read addresses.

It integrates dedicated expansion logic for daisy-chained depth expansion (up to 3072 words × 9 bits) and parallel width expansion (e.g., 1024 × 18 bits), while retaining retransmit functionality only in single-device mode. The RJ package variant supports 15 ns access timing and operates across 0°C to 70°C with VCC = 4.5–5.5 V.

Key Specifications

Pinout & Package

SN74ACT7202LA25RJ uses a 32-pin plastic J-leaded chip-carrier (RJ) package with gull-wing leads, designed for surface-mount assembly and thermal reliability in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7202LA25J and SN74ACT7202LA25DW, the SN74ACT7202LA25RJ delivers stronger TTL-compatible output drive, proven reliability in industrial vibration environments via RJ packaging, and seamless drop-in replacement in legacy TI-based FIFO designs - making it optimal for ruggedized data-acquisition and bus-bridging systems.

Availability

SN74ACT7202LA25RJ is available at Aetrix Electronics and suitable for data-acquisition systems, communication protocol queues, and bus-bridging subsystems requiring stable component supply and long-term obsolescence management.

Supply support for SN74ACT7202LA25RJ 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 industrial and communications ICs.

The SN74ACT7202LA25RJ belongs to TI's ACT-family advanced CMOS logic FIFO product line, engineered specifically for deterministic, low-latency data buffering in asynchronous multi-bus systems - emphasizing timing precision, flag-driven handshaking, and field-proven expandability.

FAQ

What is the memory depth and width of the SN74ACT7202LA25RJ?

The SN74ACT7202LA25RJ provides a fixed 1024-word depth with 9-bit width (1024 × 9), delivering 9,216 bits of first-in-first-out buffering. This configuration supports byte-wide data plus parity or framing bits, and is explicitly defined in the device's functional description and timing tables. The SN74ACT7202LA25RJ does not support programmable depth/width - expansion is achieved externally via daisy-chaining or parallel connection of multiple units.

Does the SN74ACT7202LA25RJ support simultaneous read and write operations?

Yes, the SN74ACT7202LA25RJ supports fully asynchronous and coincident read/write operations - meaning R and W can be asserted independently or concurrently, provided EF and FF flags permit the respective action. Its dual-port SRAM core and separate read/write address counters ensure no internal conflict, and timing diagrams confirm valid data capture and output within specified setup/hold windows for overlapping cycles.

How does the retransmit function work on the SN74ACT7202LA25RJ?

The SN74ACT7202LA25RJ's retransmit function is activated by pulsing FL/RT low while R and W are held high, which resets the internal read pointer to location zero without affecting the write pointer. This enables repeat delivery of the FIFO's oldest unread data. Retransmit is only valid in single-device mode (XI = GND); it is disabled during depth expansion, and misuse - such as retransmitting after >1024 writes since reset - risks data loss.

What are the key timing parameters for the SN74ACT7202LA25RJ at 40 MHz operation?

At 40 MHz operation, the SN74ACT7202LA25RJ requires minimum read/write cycle times of 25 ns, pulse widths of ≥15 ns for R and W low, and setup/hold times of ≥11 ns (data before W↑) and ≥0 ns (data hold after W↑). These values are validated in the ′ACT7202LA-25 timing column and confirmed by Figure 1 waveforms - all achievable with proper PCB layout, termination, and 5 V ±5% supply regulation.

Is the SN74ACT7202LA25RJ pin-compatible with IDT7202 series FIFOs?

Yes, the SN74ACT7202LA25RJ is functionally and pin-compatible with the IDT7202LA family in the same package variant (e.g., IDT7202LA25J), sharing identical pinout, flag behavior, expansion logic, and timing specifications. However, SN74ACT7202LA25RJ offers enhanced TTL-compatible output drive strength and ACT-series noise immunity - differences that require validation in high-noise or marginal-slew-rate environments.