Renesas 7132LA100J

Overview

7132LA100J 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), 100 ns max read cycle time, 2 V data retention capability, and industrial temperature range (–40°C to +85°C). It enables full-speed 16-bit-or-more memory expansion when paired with IDT7142 SLAVE devices in real-time control systems requiring concurrent access.

For engineers reviewing the 7132LA100J datasheet, 7132LA100J pinout, 7132LA100J application, or 7132LA100J equivalent, key selection criteria include BUSY arbitration timing (tBAA ≤ 50 ns), low-power standby current (ISB3 = 0.2 mA typ.), battery backup support, and compatibility with 48-pin flatpack or LCC packages for space-constrained embedded designs.

Technical Context

The 7132LA100J implements independent left/right port control with separate address (A0L–A10L, A0R–A10R), data (I/O0L–I/O7L, I/O0R–I/O7R), and control lines (CEL/CER, OEL/OER, R/WL/R/WR, BUSYL/BUSYR). Its arbitration logic resolves contention by asserting BUSY outputs based on chip enable and address match timing - not read/write direction - enabling deterministic priority resolution without external logic.

As a MASTER-only device, it features open-drain BUSY outputs requiring 270 Ω pull-up resistors, supports TTL-compatible 5 V ±10% operation, and delivers 2 V data retention during battery backup mode. The LA variant reduces full-standby current to 0.2 mA (typ.) versus 1.0 mA in SA versions, critical for low-power hold applications.

Key Specifications

Pinout & Package

7132LA100J is available in 48-pin Flatpack (FP48) and 48-pin LCC (LC48) packages. Both are hermetically sealed, leadless ceramic packages suitable for high-reliability industrial applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-100JC and IDT7142LA100J, the 7132LA100J uniquely integrates arbitration logic and open-drain BUSY outputs, enabling self-contained contention resolution and true 16-bit+ width expansion - eliminating board-level logic and reducing BOM count in real-time control systems.

Availability

7132LA100J is available at Aetrix Electronics and suitable for industrial automation, avionics data logging, and redundant power management systems requiring stable component supply, long-term lifecycle support, and MIL-PRF-38535-compliant reliability.

Supply support for 7132LA100J 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 industrial markets.

The IDT7132/7142 product line was designed specifically for real-time embedded systems requiring deterministic dual-port memory access, hardware arbitration, and battery-backed data retention - targeting motion control, test equipment, and mission-critical infrastructure.

FAQ

What is the function of BUSYL and BUSYR on the 7132LA100J?

BUSYL and BUSYR are open-drain outputs on the 7132LA100J that signal address contention between ports. When both ports attempt access to the same memory location, the arbitration logic asserts one BUSY line low (with 270 Ω pull-up required) to stall the later-accessing port. This prevents data corruption and eliminates need for software locks. The 7132LA100J uses these signals exclusively as outputs - unlike SLAVE devices which accept BUSY as inputs.

Does the 7132LA100J support true 16-bit data bus expansion?

Yes. The 7132LA100J is designated as a MASTER device and is explicitly designed to pair with IDT7142 SLAVE devices for seamless 16-bit-or-more word width expansion. Its on-chip arbitration logic and open-drain BUSY outputs coordinate write inhibition across multiple devices without external logic, ensuring full-speed, error-free operation as confirmed in the functional description and width expansion application note.

What is the significance of the 'LA' suffix in 7132LA100J?

'LA' denotes the low-power version of the IDT7132, characterized by reduced standby current: ISB3 = 0.2 mA (typ.) versus 1.0 mA for SA variants, and integrated 2 V data retention capability. This enables reliable memory hold during main power loss using backup batteries - a feature absent in SA versions and critical for fail-safe industrial and avionics applications.

Can the 7132LA100J operate across the full industrial temperature range at 100 ns speed?

Yes. The 7132LA100J is rated for –40°C to +85°C operation at 100 ns maximum read cycle time, as confirmed in the "Recommended Operating Temperature and Supply Voltage" table and AC Electrical Characteristics tables for 7132X100 variants. This qualification applies to both FP48 and LC48 packages and is supported by MIL-PRF-38535 QML compliance for high-reliability deployments.

Is the 7132LA100J pin-compatible with other members of the IDT7132/7142 family?

Yes - all IDT7132/7142 devices in 48-pin FP48 and LC48 packages share identical pinouts, including 7132LA100J, 7132SA25J, and 7142LA100J. Pin functions (e.g., BUSYL, CEL, A0L–A10L) are consistent across speed grades and SA/LA variants. However, electrical behavior differs: only 7132-series parts provide BUSY outputs; 7142 parts accept BUSY as inputs, and LA variants enable 2 V data retention.