Renesas 7132LA55CB

Overview

IDT7132LA55CB from Integrated Device Technology (IDT) is a high-speed 2K × 8 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, BUSY output flag, and battery-backed data retention at 2V. It supports independent asynchronous read/write access on left and right ports, features 55 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and is rated for industrial temperature range (–40°C to +85°C). It is used in real-time embedded systems requiring concurrent memory access, such as digital signal processors interfacing with host controllers.

For engineers reviewing the IDT7132LA55CB datasheet, IDT7132LA55CB pinout, IDT7132LA55CB application, or IDT7132LA55CB equivalent, key selection considerations include its master arbitration capability, open-drain BUSY outputs requiring 270Ω pull-up, 1 mW standby power consumption, 2V data retention, and compatibility with IDT7142 slave devices for 16-bit+ bus expansion.

Technical Context

The IDT7132LA55CB implements hardware-based port arbitration using address and chip enable signals - not R/W state - to assert BUSYL/BUSYR outputs when both ports access the same memory location. Its arbitration logic guarantees deterministic resolution: the port whose address/CE stabilize first wins, with tAPS = 5 ns minimum priority setup time.

As a MASTER-only device, it provides two open-drain BUSY outputs (BUSYL, BUSYR), each requiring external 270Ω pull-up resistors. The LA variant enables battery backup via V_CC = 2V data retention mode, drawing ≤4 µA typical ICCDR, while maintaining full 5V active operation. It does not support slave-side BUSY input functionality.

Key Specifications

Pinout & Package

Package: 48-pin Flatpack (FP48), hermetically sealed ceramic package with 0.75″ × 0.75″ footprint and 0.11″ height, suitable for high-reliability industrial and military applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7132LA55CB, CY7C1371DV33-166BZI offers faster speed but lacks integrated arbitration and requires voltage translation, while IDT7142LA55CB serves only as a dependent slave - neither provides the self-contained master arbitration and 2V retention of the original part.

Availability

IDT7132LA55CB is available at Aetrix Electronics and suitable for real-time industrial controllers, avionics data recorders, and medical imaging front-ends requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for IDT7132LA55CB 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs for communications, computing, and industrial markets.

IDT7132LA55CB belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency memory sharing between heterogeneous processors in mission-critical embedded systems.

FAQ

What is the function of BUSYL and BUSYR on the IDT7132LA55CB?

BUSYL and BUSYR are open-drain output pins that signal arbitration conflict when both ports attempt simultaneous access to the same memory address. They require external 270Ω pull-up resistors to VCC. When asserted low, they indicate the respective port's access is stalled - writes are internally inhibited, and reads may return invalid data until BUSY deasserts. This behavior is exclusive to the MASTER IDT7132LA55CB and is not present on SLAVE devices.

Does the IDT7132LA55CB support true 55 ns access time across the full industrial temperature range?

Yes. The IDT7132LA55CB is specified for 55 ns maximum tAA (address access time) and tRC (read cycle time) over –40°C to +85°C, as confirmed in Table 8a/b of the datasheet under "AC Electrical Characteristics." This rating applies to both SA and LA versions and is validated for FP48, LCC, and PLCC packages - no derating is required within the industrial temperature envelope.

Can the IDT7132LA55CB operate without external pull-up resistors on BUSY pins?

No. BUSYL and BUSYR are explicitly defined as open-drain outputs in the datasheet (Note 1, page 1). Without 270Ω pull-up resistors to VCC, these pins cannot drive a valid HIGH level, causing persistent BUSY assertion or undefined arbitration behavior. Omitting pull-ups will prevent correct master/slave coordination and may result in data corruption during contention scenarios.

How does the 2V data retention feature work in the IDT7132LA55CB?

The IDT7132LA55CB's LA variant enters data retention mode when VCC drops to 2.0 V, drawing ≤4 µA typical current (ICCDR) while preserving all 2K × 8 memory contents. This mode requires CE pins held high (deselected) and is guaranteed - though not production-tested - per Table 6. It is not functional at voltages below 2.0 V, and leakage is undefined below that threshold.

Is the IDT7132LA55CB pin-compatible with other members of the IDT7132/7142 family?

IDT7132LA55CB shares identical pinout and package dimensions with all 48-pin variants in the IDT7132SA/LA series (e.g., IDT7132LA25CB, IDT7132SA55CB), including FP48, LCC, and DIP footprints. However, it is not pin-compatible with 52-pin PLCC variants or IDT7142 SLAVE parts, which differ in BUSY pin functionality (input vs. output) and internal logic mapping despite mechanical similarity.