Renesas 7133LA35FB

Overview

7133LA35FB from IDT is a high-speed 2K × 16 dual-port static RAM with master arbitration logic, 35 ns max access time, 1050 mW typical active power, 1 µA typical standby current, and battery backup data retention at 2 V. It serves as the master port in width-expanded 32-bit+ memory systems for real-time DSP and military avionics.

For engineers reviewing the 7133LA35FB datasheet, 7133LA35FB pinout, 7133LA35FB application, or 7133LA35FB equivalent, this page delivers verified timing specs, BUSY arbitration behavior, byte-select write control, dual-port asynchronous operation, and 68-pin PLCC package details - all critical for deterministic multi-CPU memory coherency design.

Technical Context

The 7133LA35FB implements on-chip port arbitration logic to resolve simultaneous accesses to identical addresses across left and right ports, asserting open-drain BUSYL/BUSYR flags requiring external pull-up resistors. Its master-only arbitration enables deterministic priority resolution without external logic.

It supports independent asynchronous read/write per port with separate CE, R/WLUB/R/WLLB, OEL, address (A0L–A10L / A0R–A10R), and bidirectional I/O (I/O0L–I/O15L / I/O0R–I/O15R) - enabling full-duplex memory access in real-time embedded systems.

Key Specifications

Pinout & Package

7133LA35FB is packaged in a 68-pin PLCC (PLG68) with 0.95″ × 0.95″ footprint. Both VCC and GND pins must be connected to ensure stable operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 7133SA35FB and 71V33SA35PFI, the 7133LA35FB uniquely combines military temperature range, on-chip arbitration, and 2 V data retention - making it irreplaceable in safety-critical, battery-backed, multi-processor avionics designs.

Availability

7133LA35FB is available at Aetrix Electronics and suitable for real-time digital signal processing, military avionics flight control, and satellite onboard data handling requiring stable component supply across extended product lifecycles.

Supply support for 7133LA35FB 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 for communications, computing, and aerospace markets.

The 7133LA series belongs to IDT's military-grade dual-port SRAM product line, engineered specifically for deterministic, contention-free memory sharing in multi-processor real-time systems operating under extreme environmental stress.

FAQ

What is the role of BUSYL and BUSYR on the 7133LA35FB?

The 7133LA35FB uses BUSYL and BUSYR as open-drain output flags indicating port arbitration conflict when both ports access the same memory address simultaneously. These signals require external pull-up resistors and are used to stall the contending port's write operation - ensuring deterministic resolution without external logic. This functionality is exclusive to the master 7133LA device.

Does the 7133LA35FB support true simultaneous read/write operations?

Yes, the 7133LA35FB supports fully asynchronous, independent read and write operations on its left and right ports - provided they target different memory addresses. When addresses match, on-chip arbitration asserts BUSYL/BUSYR to inhibit the later-accessing port, preserving data integrity. This enables true dual-port concurrency in non-contention scenarios.

How does the 7133LA35FB achieve 2 V data retention?

The 7133LA35FB achieves 2 V data retention through optimized CMOS cell design and low-leakage standby circuitry. When both CE pins are high and VCC drops to ≥2 V, the RAM maintains stored data without refresh - verified per MIL-PRF-38535 QML testing. This feature is specific to LA variants and absent in SA versions like 7133SA35FB.

Can the 7133LA35FB be used without external pull-up resistors on BUSY pins?

No - the BUSYL and BUSYR pins on the 7133LA35FB are open-drain outputs and require external pull-up resistors to generate valid HIGH-level signals. Omitting pull-ups results in undefined BUSY state, causing unpredictable arbitration behavior and potential system lock-up during contention events.

What package options are available for the 7133LA35FB?

The 7133LA35FB is specified in the 68-pin PLCC (PLG68) package per the official IDT documentation. While the broader 7133/7143 family also offers 68-pin ceramic PGA, flatpack, and 100-pin TQFP variants, the FB suffix in 7133LA35FB explicitly denotes the PLCC configuration - confirmed by IDT's ordering information and pin diagrams.