Texas Instruments SN74ACT7204L15RJ

Overview

SN74ACT7204L15RJ from Texas Instruments is a 4096 × 9-bit asynchronous dual-port FIFO memory IC with independent read/write operations, 15 ns data access time, 40 MHz read/write frequency capability, and TTL-compatible inputs. It serves as a rate-matching buffer between asynchronous buses in data-acquisition systems, communication queues, and bus-to-memory interfaces.

For engineers reviewing the SN74ACT7204L15RJ datasheet, SN74ACT7204L15RJ pinout, SN74ACT7204L15RJ application, or SN74ACT7204L15RJ equivalent, key selection considerations include its 32-pin plastic J-leaded chip-carrier (RJ) package, retransmit capability, empty/full/half-full status flags, and compatibility with IDT7204-based designs.

Technical Context

The SN74ACT7204L15RJ implements a first-in, first-out (FIFO) architecture using dual-port SRAM with independent internal write and read address counters. Its asynchronous operation supports coincident or non-coincident read/write cycles without clock synchronization.

It features depth-expansion logic for cascading multiple devices into larger FIFOs, retransmit functionality via FL/RT input to reset the read pointer, and status flag generation (EF, FF, XO/HF) directly tied to pointer arithmetic-FF asserts when write pointer is one location behind read pointer (4096-word capacity), EF asserts when pointers align, and XO/HF functions as half-full flag when XI = GND.

Key Specifications

Pinout & Package

SN74ACT7204L15RJ is housed in a 32-pin plastic J-leaded chip-carrier (RJ) package with gull-wing leads, designed for surface-mount assembly and thermal reliability in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7204LA15J, SN74ACT7204L15RJ offers identical FIFO functionality and timing but differs in package (RJ vs. PLCC) and manufacturer qualification; compared with SN74ACT7204L15DV, it shares TI origin and logic behavior but trades SOIC compactness for RJ's superior thermal dissipation and mounting robustness.

Availability

SN74ACT7204L15RJ is available at Aetrix Electronics and suitable for data-acquisition systems, communication protocol queues, and bus-to-memory interfaces requiring stable component supply across extended production lifecycles.

Supply support for SN74ACT7204L15RJ 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 technologies with decades of industrial and automotive qualification expertise.

The SN74ACT7204L15RJ belongs to TI's ACT-family advanced CMOS logic FIFO product line, engineered for high-speed, low-power, asynchronous data buffering in commercial-grade embedded systems.

FAQ

What is the memory depth and width of the SN74ACT7204L15RJ?

The SN74ACT7204L15RJ provides a 4096-word deep by 9-bit wide FIFO memory structure. This configuration supports storage of 4096 data words, each containing 9 bits-ideal for byte-plus-parity or packet-framing applications. The 9-bit width is explicitly defined in the device's functional description and confirmed across all timing diagrams and application notes in the SCAS226A datasheet.

Does the SN74ACT7204L15RJ support simultaneous read and write operations?

Yes, the SN74ACT7204L15RJ supports fully asynchronous read and write operations that may occur coincidentally or independently. Its dual-port SRAM core and separate read/write address counters allow concurrent access without bus contention or arbitration logic-verified by the "Reads and Writes Can Be Asynchronous or Coincident" statement in the datasheet's front-page summary.

What is the purpose of the FL/RT pin on the SN74ACT7204L15RJ?

The FL/RT (First-Load/Retransmit) pin on the SN74ACT7204L15RJ serves dual roles: in depth-expanded configurations, it selects the first device in a daisy chain; in single-device mode (with XI grounded), a low pulse resets the read pointer to enable retransmission of previously read data. This function is documented in the RESET AND RETRANSMIT FUNCTION TABLE and timing diagram Figure 4 of the SCAS226A datasheet.

Can the SN74ACT7204L15RJ be used in depth-expansion configurations?

Yes, the SN74ACT7204L15RJ supports depth expansion via its XI and XO/HF pins to cascade multiple units into a larger FIFO. When XI is connected to the XO/HF output of the preceding device, the internal expansion logic propagates pointer states across the chain. The datasheet confirms this capability in the functional block diagram (page 6), Application Information section (page 18), and Figure 15.

What package type does the SN74ACT7204L15RJ use, and how many pins does it have?

The SN74ACT7204L15RJ uses a 32-pin plastic J-leaded chip-carrier (RJ) package, as explicitly stated in the "Available in … 32-Pin Plastic J-Leaded Chip-Carrier (RJ) Packages" line of the datasheet's Features section. Pin numbering and top-view layout are provided in the "RJ PACKAGE (TOP VIEW)" diagram on page 1 of SCAS226A.