Renesas 7143LA25J

Overview

7143LA25J from Integrated Device Technology (IDT) is a high-speed 2K × 16 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting independent asynchronous read/write access on left and right ports with 25 ns maximum read cycle time, 2V data retention capability, and industrial temperature operation (–40°C to +85°C) - used in real-time DSP co-processing, military avionics bus arbitration, and redundant controller memory buffering.

For engineers reviewing the 7143LA25J datasheet, 7143LA25J pinout, 7143LA25J application, or 7143LA25J equivalent, this page delivers verified electrical specs, BUSY-input timing constraints, byte-select write control, low-power standby behavior (1 µA typ.), and precise package mapping for 68-pin PLCC implementation.

Technical Context

The 7143LA25J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - no internal clock required. Its BUSY pin functions exclusively as an input (unlike the MASTER 7133), enabling hardware write inhibition during contention without arbitration logic onboard.

It supports TTL-compatible 5V ±10% operation, battery backup via 2V data retention mode, and byte-level write enable (R/WLUB/R/WLLB and R/WRUB/R/WRLB) for independent upper/lower 8-bit writes on each port - critical for mixed-endian or partial-word update scenarios in embedded control systems.

Key Specifications

Pinout & Package

7143LA25J is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), requiring both VCC pins (pins 17 & 51) and both GND pins (pins 34 & 68) to be connected for reliable operation. Pin layout is identical to IDT7133 series devices.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with CY7C1375D-25AC and IS61LV25616AL-25TQLI, the 7143LA25J uniquely delivers hardware BUSY-input arbitration, 2V data retention, and pin-identical compatibility with IDT7133 MASTER - making it irreplaceable in legacy military and industrial dual-processor memory systems requiring guaranteed contention resolution.

Availability

7143LA25J is available at Aetrix Electronics and suitable for real-time DSP co-processing, military avionics bus arbitration, and redundant controller memory buffering requiring stable component supply across extended product lifecycles.

Supply support for 7143LA25J 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, and RF solutions for communications and computing infrastructure.

The IDT7143 family was designed specifically for high-reliability dual-processor memory expansion with hardware arbitration - targeting aerospace, defense, and industrial control applications demanding deterministic latency and data integrity.

FAQ

What is the role of BUSY pins on the 7143LA25J?

The BUSY pins (BUSYL and BUSYR) on the 7143LA25J function exclusively as inputs - unlike the MASTER 7133, which drives them as open-drain outputs. When asserted LOW by an external MASTER device (e.g., IDT7133), they inhibit write operations on the corresponding port. This enables hardware-enforced contention resolution in width-expanded memory systems without additional logic. The 7143LA25J itself contains no arbitration circuitry.

Does the 7143LA25J support battery backup operation?

Yes, the 7143LA25J supports battery backup operation with guaranteed data retention down to 2.0 V (VDR). In retention mode, it draws only 100 µA typical (ICCDR) at 25°C, enabling direct connection to a lithium coin cell or backup rail. This feature is intrinsic to the LA (low-power) variant and is validated across the full industrial temperature range (–40°C to +85°C).

Can the 7143LA25J be used as a standalone dual-port RAM without a MASTER device?

Yes, the 7143LA25J operates fully as a standalone dual-port SRAM with independent left/right port access. However, its BUSY pins must be tied HIGH (via pull-up resistors) to disable write inhibition - since no internal arbitration logic exists. In this configuration, simultaneous writes to the same address result in undefined data; external software or system-level arbitration is required.

What package types are available for the 7143LA25J?

The 7143LA25J is specified and qualified in the 68-pin Plastic Leaded Chip Carrier (PLCC) package (package code PLG68), with body dimensions approximately 0.95 in × 0.95 in × 0.17 in. While the IDT7143 family also supports PGA, flatpack, and 100-pin TQFP variants, the "J" suffix in 7143LA25J explicitly denotes the PLCC packaging per IDT's ordering nomenclature.

How does the 7143LA25J differ from the 7133LA25J?

The 7143LA25J is the SLAVE counterpart to the MASTER 7133LA25J. Key differences: (1) BUSY pins are inputs (not outputs); (2) no on-chip arbitration logic; (3) no BUSY output flag generation; (4) identical pinout and timing but relies on external MASTER for contention resolution. They are designed to operate together - not interchangeably - in 32-bit+ memory expansions.