Renesas 7143LA35GB

Overview

7143LA35GB from IDT (Integrated Device Technology) 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 35 ns max read cycle time, 2V data retention, and industrial temperature range (–40°C to +85°C). It enables error-free 32-bit-or-wider memory systems without external logic in telecom switching, real-time DSP buffering, and military avionics.

For engineers reviewing the 7143LA35GB datasheet, 7143LA35GB pinout, 7143LA35GB application, or 7143LA35GB equivalent, this page delivers verified timing parameters, BUSY input behavior, low-power standby current (1 mA typ.), byte-select write control, and package-specific pin mapping for 68-pin PLCC, PGA, and flatpack - all critical for deterministic arbitration and battery-backed system design.

Technical Context

The 7143LA35GB implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its BUSY pin functions exclusively as an input (unlike the MASTER 7133), enabling write-inhibit arbitration when driven by a 7133's open-drain BUSY output with pull-up.

It supports TTL-compatible signaling on a single 5.0 V ±10% supply, includes independent upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB), and features automatic power-down via chip enable (CE) - entering 1 µA typical standby when both CE pins are high under CMOS-level inputs.

Key Specifications

Pinout & Package

7143LA35GB is available in 68-pin PLCC (PLG68), 68-pin ceramic PGA (GU68), and 68-pin flatpack (FP68) packages. All variants share identical pinout and function mapping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-35BVXI and IDT7133LA35GB, the 7143LA35GB uniquely delivers SLAVE-specific BUSY input behavior, enabling scalable 32-bit+ memory systems with zero external logic - a capability absent in synchronous alternatives and unnecessary in standalone MASTER configurations.

Availability

7143LA35GB is available at Aetrix Electronics and suitable for telecom switching buffers, real-time DSP data exchange, and military avionics shared memory requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for 7143LA35GB 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 sensor solutions, acquired by Renesas Electronics in 2019.

The IDT7133/7143 family was designed for deterministic, low-latency dual-processor memory sharing in mission-critical systems - emphasizing hardware arbitration, battery backup, and industrial/military reliability over density or cost.

FAQ

What is the role of BUSY pins on the 7143LA35GB?

The BUSYL and BUSYR pins on the 7143LA35GB are dedicated inputs - not outputs - and serve solely to receive BUSY signals from a MASTER 7133 device. When asserted low, they internally gate write operations on the corresponding port to prevent contention. Unlike the MASTER, the 7143LA35GB contains no arbitration logic or open-drain driver; its BUSY functionality is strictly slave-side inhibition. This design eliminates race conditions in width-expanded systems.

Can the 7143LA35GB operate standalone without a 7133 MASTER?

Yes, the 7143LA35GB can operate as a standalone dual-port SRAM if BUSYL and BUSYR are tied HIGH (via pull-up resistors), disabling write-inhibit arbitration. In this mode, it behaves identically to the 7133LA35GB except for missing on-chip arbitration logic and BUSY output capability. All timing, voltage, and functional specifications remain valid - making it suitable for non-contention applications like simple dual-CPU shared memory with software-managed access.

What is the significance of the 'LA' suffix in 7143LA35GB?

The 'LA' in 7143LA35GB denotes the Low-Power Active/Standby variant: it draws 1050 mW typical active power and only 1 mW typical standby current (vs 1150 mW / 5 mW for SA versions). This 80% standby reduction enables viable battery backup operation down to 2 V, with data retention confirmed at that voltage. The LA variant is specifically optimized for systems requiring extended hold-up time during AC failure or portable operation.

Which packages are available for the 7143LA35GB?

The 7143LA35GB is offered in three hermetically sealed or molded packages: 68-pin PLCC (PLG68), 68-pin ceramic PGA (GU68), and 68-pin flatpack (FP68). All share identical pinout, timing, and electrical characteristics. The PLCC version is most common for prototyping and industrial PCBs; PGA suits high-reliability military/aerospace; flatpack provides superior thermal dissipation in conduction-cooled modules.

How does the 7143LA35GB handle simultaneous access to the same memory location?

The 7143LA35GB itself does not resolve simultaneous access - it relies entirely on an external MASTER 7133 to drive its BUSYL/BUSYR inputs. When contention occurs, the MASTER asserts BUSY, and the 7143LA35GB responds by inhibiting the write on the contending port. No data corruption occurs because the inhibited write is blocked before reaching the memory array. This hardware-enforced arbitration guarantees deterministic resolution without software intervention or timing uncertainty.