Renesas 7132SA25L48B

Overview

7132SA25L48B 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), and 25 ns maximum read cycle time (t_RC). It operates at 5V ±10%, supports independent asynchronous access on left/right ports, and targets real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7132SA25L48B datasheet, 7132SA25L48B pinout, 7132SA25L48B application, or 7132SA25L48B equivalent, key selection considerations include BUSY arbitration timing (t_BAA ≤ 25 ns), 48-pin flatpack package compatibility, industrial temperature range (–40°C to +85°C), and master/slave expansion capability for 16-bit+ data width systems.

Technical Context

The 7132SA25L48B implements hardware-based port arbitration using address and chip-enable inputs to assert BUSYL/BUSYR outputs-no external logic required. Its open-drain BUSY pins require 270 Ω pull-up resistors and drive write-inhibit signals on slave devices (e.g., IDT7142) during address contention.

It features independent CE, OE, and R/W controls per port, TTL-compatible I/O, and automatic power-down when CE = VIH. The device uses CMOS technology with typical active power of 325 mW and full-standby current as low as 0.2 mA (LA variant), though 7132SA25L48B is SA-grade.

Key Specifications

Pinout & Package

7132SA25L48B is packaged in a 48-lead flatpack (FP48) with 0.75″ × 0.75″ footprint and 0.11″ height. All V_CC and GND pins must be externally connected per datasheet note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7142SA25L48B and CY7C024AV-25AXC, the 7132SA25L48B uniquely delivers integrated arbitration and MASTER functionality in a 48-pin flatpack, enabling simpler, more reliable shared-memory architectures without added components or timing-critical software.

Availability

7132SA25L48B is available at Aetrix Electronics and suitable for industrial motion control, avionics data acquisition, real-time inter-processor communication, and digital signal processing buffering requiring stable component supply and long-term obsolescence management.

Supply support for 7132SA25L48B 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 semiconductor company specializing in timing, memory interface, and RF solutions, now part of Renesas Electronics since 2019.

The IDT7132/7142 family was designed specifically for deterministic, low-latency shared-memory applications in embedded control and communications systems where hardware arbitration eliminates software overhead and timing uncertainty.

FAQ

What is the function of BUSYL and BUSYR on the 7132SA25L48B?

BUSYL and BUSYR are open-drain arbitration status outputs on the 7132SA25L48B. When asserted low, they indicate that the corresponding port (left or right) has detected address contention with the opposite port. These signals must be pulled up with 270 Ω resistors and are used to stall writes on slave devices like IDT7142. The 7132SA25L48B is the only device in the family with BUSY outputs; IDT7142 uses them as inputs.

Can the 7132SA25L48B operate as a standalone dual-port RAM without a slave device?

Yes, the 7132SA25L48B can operate as a standalone 2K × 8 dual-port SRAM with full read/write capability on both ports. Its on-chip arbitration logic and BUSY outputs remain functional even without a slave-contending accesses result in one port proceeding and the other being stalled. The SLAVE functionality (IDT7142) is optional and only required when expanding data width beyond 8 bits.

What is the significance of the 'SA' suffix in 7132SA25L48B?

The 'SA' in 7132SA25L48B denotes the standard-power version of the IDT7132 family. It contrasts with 'LA', which indicates low-power operation with 2V data retention capability. The SA variant has typical active current of 325 mW and standby current of 5 mW, optimized for performance over ultra-low-power battery backup-making 7132SA25L48B suitable for mains-powered industrial systems.

Which packages are available for the 7132SA25L48B, and what does 'L48B' signify?

The 'L48B' suffix in 7132SA25L48B specifies the 48-lead flatpack (FP48) package with military-grade hermetic sealing and compliance to MIL-PRF-38535 QML. This package measures approximately 0.75″ × 0.75″ × 0.11″ and is distinct from DIP, LCC, or PLCC variants. The flatpack construction ensures reliability in high-vibration and extended-temperature environments typical of aerospace and defense applications.

How does the 7132SA25L48B handle simultaneous read and write operations to the same memory location?

When both ports attempt access to the same address, the 7132SA25L48B's hardware arbitration asserts BUSYL or BUSYR within 25 ns (t_BAA) to stall the later-arriving write. The earlier access proceeds unimpeded; the stalled write is gated internally and does not modify memory. Valid data from the winning port appears after t_BDD (BUSY disable to valid data), ensuring deterministic behavior without software intervention or data corruption.