Renesas 7133LA35J

Overview

7133LA35J from IDT (Integrated Device Technology) is a high-speed 2K × 16 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 35ns maximum read cycle time, 2V data retention capability, and TTL-compatible 5V ±10% operation - used in real-time embedded systems requiring concurrent CPU/DSP memory access without external arbitration.

For engineers reviewing the 7133LA35J datasheet, 7133LA35J pinout, 7133LA35J application, or 7133LA35J equivalent, this page delivers verified timing parameters, byte-selectable write control per port, BUSY arbitration behavior, industrial temperature support (–40°C to +85°C), and direct substitution guidance for dual-port SRAM selection in military-grade or high-reliability designs.

Technical Context

The 7133LA35J implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves contention when both ports access the same memory location simultaneously, asserting open-drain BUSYL/BUSYR outputs that require external pull-up resistors.

As a low-power (LA) variant, it draws only 1mW typical standby current and supports battery backup at VCC = 2V with guaranteed data retention. It features separate upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB) and operates across –40°C to +85°C with 5.0V ±10% supply.

Key Specifications

Pinout & Package

68-pin Plastic Leaded Chip Carrier (PLCC, package code PLG68), top-view layout with corner index mark. Dual-port architecture requires dedicated left-port (L) and right-port (R) signal groups, including two VCC and two GND pins - both must be connected for reliable operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362AV-35AC and IDT7143LA35J, the 7133LA35J uniquely integrates arbitration logic and open-drain BUSY outputs - enabling drop-in deployment in single-chip dual-CPU systems and simplifying timing-critical width expansion without external logic.

Availability

7133LA35J is available at Aetrix Electronics and suitable for radar signal processing, DSP co-processor interfaces, redundant flight control systems, industrial PLCs, and avionics subsystems requiring stable component supply, long-term lifecycle support, and industrial-temperature qualification.

Supply support for 7133LA35J 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 high-performance memory, timing, and interface solutions, now part of Renesas Electronics since 2019.

The IDT7133/7143 family was designed specifically for real-time embedded systems requiring deterministic, contention-free dual-processor memory sharing - targeting aerospace, defense, industrial automation, and telecom infrastructure.

FAQ

What is the function of the BUSY pins on the 7133LA35J?

The BUSYL and BUSYR pins on the 7133LA35J are open-drain outputs that signal memory contention when both ports attempt simultaneous access to the same address. They require external pull-up resistors and are used to stall the contending port until the current operation completes. This hardware arbitration eliminates race conditions without software intervention or external logic.

Does the 7133LA35J support battery backup operation?

Yes, the 7133LA35J supports battery backup operation with guaranteed data retention at VCC ≥ 2.0V. In retention mode, it draws only ≈200µA (1mW at 5V), allowing extended hold time from small backup cells. This feature is intrinsic to the LA (low-power) variant and is validated across the industrial temperature range.

Can the 7133LA35J be used as a standalone dual-port RAM without arbitration?

Yes, the 7133LA35J functions as a fully asynchronous dual-port SRAM even when BUSY logic is disabled - for example, by tying BUSYL/BUSYR high. In such cases, contention results in undefined data, so system-level arbitration (e.g., via software handshake or external logic) must be implemented. The on-chip arbitration is optional but recommended for deterministic operation.

What is the difference between 7133LA35J and 7143LA35J?

The 7133LA35J is the MASTER device with on-chip arbitration logic and open-drain BUSY outputs. The 7143LA35J is the SLAVE device: identical pinout and timing, but BUSY pins are inputs only and it lacks arbitration logic. They are designed to operate together - one 7133LA35J controls arbitration for multiple 7143LA35J chips in width-expanded systems.

Which packages are available for the 7133LA35J?

The 7133LA35J is available in 68-pin PLCC (PLG68), 68-pin ceramic PGA (GU68), 68-pin flatpack (FP68), and 100-pin TQFP (PNG100). The J-suffix in 7133LA35J specifically denotes the PLCC package. All variants share identical electrical specifications and pin functions, though mechanical dimensions and thermal characteristics differ.