Renesas 7143LA20JG

Overview

7143LA20JG from IDT is a low-power 2K × 16-bit dual-port static RAM designed as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting asynchronous read/write on independent left/right ports with 20 ns max read cycle time, 2V data retention, and TTL-compatible 5V ±10% operation - used in real-time avionics bus controllers requiring concurrent CPU and DSP access to shared memory.

For engineers reviewing the 7143LA20JG datasheet, 7143LA20JG pinout, 7143LA20JG application, or 7143LA20JG equivalent, key selection criteria include BUSY input functionality (not output), LA-series standby current (1 µA typ.), 68-pin PLCC package compatibility, and absence of on-chip arbitration logic - distinguishing it from the MASTER IDT7133LA20JG.

Technical Context

The 7143LA20JG operates as a SLAVE dual-port SRAM with dedicated BUSY input (BUSYL/BUSYR) for write inhibition during port contention, enabling synchronized 32-bit+ width expansion when paired with an IDT7133 MASTER. It lacks internal arbitration logic and relies entirely on external BUSY signaling.

Each port supports independent address (A0–A10), control (CEL/CER, R/WLUB/R/WRUB, R/WLLB/R/WRLB, OEL/OER), and bidirectional I/O (I/O0–I/O15) lines. Battery backup mode maintains data integrity at VCC = 2V with typical ICCDR = 100 µA.

Key Specifications

Pinout & Package

7143LA20JG is packaged in a 68-pin PLCC (PLG68) with 0.95″ × 0.95″ footprint and 0.17″ height. 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 IDT7133LA20JG, 7143LA20JG eliminates arbitration overhead and reduces standby current by 80%, making it optimal for SLAVE roles in width-expanded systems; versus CY7C133-20JC, it delivers true asynchronous dual-port capability essential for real-time co-processing.

Availability

7143LA20JG is available at Aetrix Electronics and suitable for avionics data bus controllers, industrial motion control PLCs, military communications transceivers, and DSP-based real-time signal processors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7143LA20JG 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, and RF solutions, acquired by Renesas Electronics in 2019.

The IDT7143 family was engineered specifically for SLAVE-side dual-port memory expansion in high-reliability systems, enabling scalable 32-bit+ word widths without external arbitration logic or timing penalties.

FAQ

What is the primary functional distinction between 7143LA20JG and IDT7133LA20JG?

The 7143LA20JG is a SLAVE-only dual-port SRAM with BUSY input pins (BUSYL/BUSYR) for write inhibition, lacking on-chip arbitration logic. In contrast, IDT7133LA20JG is the MASTER device featuring BUSY output and internal arbitration. The 7143LA20JG must be paired with a MASTER to resolve port contention; it cannot operate autonomously in contention scenarios. This architectural split enables scalable memory width expansion without "busy lock-out."

Does 7143LA20JG support battery backup operation, and what are the conditions?

Yes, 7143LA20JG supports battery backup with guaranteed data retention at VCC = 2.0 V minimum. Under this condition, typical data retention current (ICCDR) is 100 µA, enabling multi-day operation from standard coin cells. The device maintains stored data without refresh, and all control inputs must remain at valid logic levels (VIL < 0.8 V or VIH > 2.2 V) during retention mode.

What is the correct configuration for BUSY pins on 7143LA20JG in normal operation?

In normal operation, both BUSYL and BUSYR pins on 7143LA20JG must be externally pulled HIGH (e.g., via 4.7 kΩ resistors to VCC) to disable write inhibition and allow unrestricted access. These pins function solely as inputs - unlike the MASTER IDT7133LA20JG, which drives BUSY as an open-drain output requiring pull-up resistors. Leaving BUSY pins floating or LOW will block all writes to the respective port.

Can 7143LA20JG be used as a standalone dual-port RAM without a MASTER device?

No, 7143LA20JG cannot be used standalone in systems where port contention may occur. As a SLAVE device, it relies on external BUSY signals from a MASTER (e.g., IDT7133LA20JG) to manage simultaneous access to the same memory location. Without a MASTER, contention events result in undefined data and potential corruption. For standalone use, IDT7133LA20JG or other self-arbitrating dual-port SRAMs are required.

What package type and pin count does 7143LA20JG use, and are there thermal considerations?

7143LA20JG uses a 68-pin PLCC (PLG68) package measuring approximately 0.95″ × 0.95″ × 0.17″. Both VCC pins must be connected to the 5V supply and both GND pins to ground for reliable operation. Thermal design must account for 1050 mW typical active power dissipation; derating is recommended above +70°C ambient, especially in sealed enclosures without forced airflow.