Renesas 7143LA25J8

Overview

7143LA25J8 from IDT is a low-power 2K × 16 dual-port static RAM designed as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting independent asynchronous access on left and right ports with 25 ns max read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C) - used in real-time DSP co-processing and military-grade avionics data buffers.

For engineers reviewing the 7143LA25J8 datasheet, 7143LA25J8 pinout, 7143LA25J8 application, or 7143LA25J8 equivalent, this page delivers verified timing specs, BUSY input behavior, byte-select write control, battery backup capability (2V data retention), and exact package mapping for 68-pin PLCC (J8 suffix).

Technical Context

The 7143LA25J8 operates as a SLAVE in MASTER/SLAVE dual-port configurations: its BUSY pin functions exclusively as an input to receive arbitration signals from a MASTER IDT7133, enabling synchronized 32-bit+ width expansion without external logic. It lacks on-chip arbitration logic and BUSY output functionality.

It supports fully asynchronous dual-port operation with separate upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB), independent chip enables (CEL/CER), and output enables (OEL/OER); all I/Os are bidirectional with high-impedance control, and power-down is managed per-port via CE assertion.

Key Specifications

Pinout & Package

7143LA25J8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), J8 suffix, with body dimensions approx. 0.95 in × 0.95 in × 0.17 in. Both VCC and GND pins require connection to ensure reliable operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-25JC, 7143LA25J8 offers integrated SLAVE BUSY input enabling simpler, faster width expansion; compared with IDT7134LA25J8, it provides lower cost and power for 2K applications where density is constrained.

Availability

7143LA25J8 is available at Aetrix Electronics and suitable for real-time DSP co-processing, military avionics data buffering, and industrial PLC I/O mapping requiring stable component supply across extended product lifecycles.

Supply support for 7143LA25J8 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

IDT (Integrated Device Technology) is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance silicon solutions for communications, computing, and industrial markets.

The IDT7143 product line delivers SLAVE-configured dual-port SRAMs optimized for width-expansion architectures - designed specifically to pair with IDT7133 MASTER devices and eliminate external arbitration logic in high-reliability systems.

FAQ

What is the role of BUSY pins on the 7143LA25J8?

The BUSY pins (BUSYL and BUSYR) on the 7143LA25J8 function exclusively as inputs - unlike the MASTER IDT7133, which drives BUSY as an open-drain output. When asserted low by a connected MASTER device, they inhibit write operations on the corresponding port, enforcing hardware-level arbitration in width-expanded memory systems. This behavior is fixed and cannot be reconfigured.

Does the 7143LA25J8 support battery backup operation?

Yes, the 7143LA25J8 supports battery backup operation with guaranteed data retention at VCC = 2.0 V. In this mode, typical data retention current is 100 µA (commercial) or up to 4000 µA (military/industrial), enabling persistent storage during main power loss - a key feature distinguishing the LA (low-power) variant from the SA series.

Is the 7143LA25J8 pin-compatible with the IDT7133LA25J8?

Yes, the 7143LA25J8 shares identical pinout and package (68-pin PLCC, J8) with the IDT7133LA25J8, allowing mechanical compatibility on the same PCB footprint. However, functional differences exist: 7143LA25J8 has BUSY inputs only and no on-chip arbitration logic, while IDT7133LA25J8 provides BUSY outputs and internal arbitration - requiring correct signal routing per device role.

What is the maximum operating frequency supported by the 7143LA25J8?

The 7143LA25J8 does not operate at a fixed clock frequency; it is an asynchronous SRAM. Its 25 ns maximum read cycle time (tRC) supports effective data transfer rates up to ~40 MHz in systems where address/control setup/hold times are met. Actual throughput depends on system-level timing margins, not an internal clock.

Can the 7143LA25J8 be used as a standalone dual-port RAM without a MASTER device?

Yes, the 7143LA25J8 can operate as a standalone dual-port RAM without a MASTER. In this mode, BUSYL and BUSYR must be tied HIGH (e.g., via pull-up resistors) to disable write inhibition, enabling full independent read/write access on both ports. No arbitration occurs, so simultaneous writes to the same address result in undefined data - software coordination is required.