Renesas 7132LA55J8

Overview

7132LA55J8 from IDT is a high-speed 2K × 8 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, BUSY output flag (open-drain), 55 ns max read cycle time, 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables full-speed 16-bit-or-wider memory expansion when paired with IDT7142 SLAVE devices in real-time embedded control systems.

For engineers reviewing the 7132LA55J8 datasheet, 7132LA55J8 pinout, 7132LA55J8 application, or 7132LA55J8 equivalent, this part supports deterministic port arbitration, battery-backed data retention at 2 V, low-power standby (1 mW typ.), and TTL-compatible operation without external logic in width-expanded memory architectures.

Technical Context

The 7132LA55J8 implements independent left/right ports with separate address (A0–A10), control (CEL/CER, OEL/OER, R/WL/R/WR), and I/O (I/O0–I/O7) buses, enabling true asynchronous concurrent access. Its arbitration logic evaluates chip enable and address stability across ports to assert BUSYL/BUSYR outputs before write initiation.

As a MASTER-only device, it features open-drain BUSY outputs requiring 270 Ω pull-ups, supports CE-controlled power-down (ISB3 = 0.2 mA typ. at CMOS inputs), and guarantees data retention down to 2 V - a capability exclusive to LA variants and absent in SA versions.

Key Specifications

Pinout & Package

7132LA55J8 is supplied in a 48-pin flatpack (FP48) package with 0.75″ × 0.75″ footprint and 0.11″ height, designed for high-temperature stability and low-inductance grounding in ruggedized PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-55JC and IDT7142LA55J8, the 7132LA55J8 uniquely delivers integrated arbitration, 2 V data retention, and master functionality in a single 48-pin FP48 package - essential for deterministic real-time memory sharing without added components.

Availability

7132LA55J8 is available at Aetrix Electronics and suitable for industrial motion control, avionics data logging, and redundant PLC memory modules requiring stable component supply across extended product lifecycles.

Supply support for 7132LA55J8 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, now part of Renesas Electronics since 2019.

The IDT7132/7142 family was engineered for deterministic dual-processor memory sharing in real-time industrial and aerospace systems, emphasizing hardware arbitration, low-power operation, and ruggedized packaging.

FAQ

What is the function of BUSYL and BUSYR on the 7132LA55J8?

BUSYL and BUSYR are open-drain arbitration outputs on the 7132LA55J8. When asserted LOW, they indicate that the opposite port has initiated an access to the same memory location - blocking writes on the asserting side. Each requires a 270 Ω pull-up resistor per datasheet Figure 3. The 7132LA55J8 uses these signals to resolve contention without external logic, distinguishing it from SLAVE-only variants like IDT7142LA55J8.

Does the 7132LA55J8 support battery backup operation?

Yes, the 7132LA55J8 supports battery backup operation with guaranteed data retention at VCC = 2.0 V (per Table 6), consuming ≤4000 µA in retention mode. This feature is exclusive to LA variants and not available in SA versions. It enables nonvolatile storage during main power loss in safety-critical applications such as flight data recorders or emergency shutdown controllers.

Can the 7132LA55J8 operate as a standalone dual-port RAM without a SLAVE device?

Yes, the 7132LA55J8 functions fully as a standalone 2K × 8 dual-port SRAM with independent left/right ports, control, and I/O. Its MASTER designation refers to its ability to coordinate with IDT7142 SLAVE devices in width-expanded configurations - not a requirement for basic operation. Standalone use is common in dual-processor interconnects where both sides share the same 7132LA55J8 without expansion.

What is the significance of the 'J8' suffix in 7132LA55J8?

The 'J8' suffix in 7132LA55J8 denotes the 48-pin flatpack (FP48) package with military-grade hermetic sealing and compliance to MIL-PRF-38535 QML Class V standards. It specifies mechanical form factor, thermal performance (–40°C to +85°C), and reliability qualification - distinct from 'JG' (PLCC) or 'JD' (DIP) variants. This package ensures long-term stability in high-vibration, high-temperature environments.

How does the 7132LA55J8 handle simultaneous access to the same memory address?

The 7132LA55J8 uses on-chip arbitration logic to detect simultaneous address matches across ports. If tAPS (arbitration priority setup time = 5 ns) is violated, BUSYL or BUSYR asserts LOW to stall the later-arriving write. The earlier port wins automatically - no software intervention required. This hardware-enforced priority prevents data corruption and eliminates need for external semaphores in real-time systems using the 7132LA55J8.