Renesas 7132SA55L48B

Overview

7132SA55L48B from IDT is a high-speed 2K × 8 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 55 ns maximum read/write cycle time, TTL-compatible 5V ±10% operation, and 48-pin flatpack (FP48) packaging. It enables full-speed 16-bit-or-wider memory expansion when paired with IDT7142 SLAVE devices in real-time avionics data buffers and military-grade digital signal processors.

For engineers reviewing the 7132SA55L48B datasheet, 7132SA55L48B pinout, 7132SA55L48B application, or 7132SA55L48B equivalent, key selection criteria include BUSY arbitration timing (tBAA ≤ 30 ns), dual-port independent access capability, industrial/military temperature support (–40°C to +85°C), low-power standby current (ISB3 = 0.2 mA typ.), and open-drain BUSY output requiring 270 Ω pull-up.

Technical Context

The 7132SA55L48B implements hardware-based port arbitration using address- and chip-enable-triggered BUSY flag generation-no external logic required. Its dual independent ports (left/right) support simultaneous asynchronous reads/writes to any memory location, with automatic power-down via CE control.

As a MASTER-only device, it features open-drain BUSYL and BUSYR outputs (requiring 270 Ω pull-ups), on-chip arbitration priority set-up (tAPS = 5 ns), and write-inhibit behavior when BUSY is asserted-critical for deterministic contention resolution in real-time embedded systems.

Key Specifications

Pinout & Package

48-pin flatpack (FP48) package, body dimensions ≈ 0.75 in × 0.75 in × 0.11 in, side-braze construction compliant with MIL-PRF-38535 QML for high-reliability military use.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-55JC, the 7132SA55L48B reduces BOM count and layout complexity by integrating arbitration; compared with IDT7142SA55L48B, it provides autonomous master functionality essential for standalone dual-port operation.

Availability

7132SA55L48B is available at Aetrix Electronics and suitable for avionics data buffering, digital signal processor memory, military radar signal processing, and industrial motion controller applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7132SA55L48B 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 deterministic, low-latency dual-port memory applications in real-time embedded systems where hardware arbitration eliminates software overhead and timing uncertainty.

FAQ

What is the function of BUSYL and BUSYR on the 7132SA55L48B?

BUSYL and BUSYR are open-drain arbitration flag outputs unique to the MASTER 7132SA55L48B. They assert low when port contention occurs-i.e., when both left and right ports attempt simultaneous access to the same memory address. Each requires a 270 Ω pull-up resistor to VCC. The 7132SA55L48B uses these signals to internally inhibit writes on the contending port, ensuring deterministic resolution without external logic.

Can the 7132SA55L48B operate in battery backup mode?

No. Battery backup data retention (down to 2V) is exclusive to LA-suffix variants like 7132LA55L48B. The 7132SA55L48B is the standard-power version and does not support VCC < 4.5 V operation or data retention below nominal supply. Its ISB3 standby current is 0.2 mA at 5V, but it lacks the low-voltage retention circuitry found in LA parts.

What is the significance of tAPS = 5 ns in the 7132SA55L48B specification?

tAPS (Arbitration Priority Set-up Time) is the minimum time the winning port's address and chip enable must stabilize before the losing port's access begins, ensuring deterministic BUSY assertion. At 5 ns, the 7132SA55L48B guarantees that arbitration resolves before invalid data can be latched-critical for real-time systems where timing predictability affects functional safety certification.

How does the 7132SA55L48B differ from the IDT7142 series?

The 7132SA55L48B is a MASTER device with on-chip arbitration logic and BUSY outputs; the IDT7142 is a SLAVE device with BUSY inputs and no arbitration circuitry. The 7132SA55L48B operates standalone or as the controller in master/slave pairs, while IDT7142 devices depend entirely on a 7132 for BUSY signaling and cannot resolve contention autonomously.

Is the 7132SA55L48B compatible with PLCC or DIP packages?

No. The suffix "L48B" explicitly denotes the 48-pin flatpack (FP48) package. While the IDT7132 family is offered in 48-pin DIP, LCC, and 52-pin PLCC variants, the 7132SA55L48B is qualified and screened only in the FP48 configuration-required for MIL-PRF-38535 QML compliance and thermal performance in conduction-cooled military modules.