Renesas 7130SA55J8/C

Overview

7130SA55J8/C from IDT is a high-speed 1K × 8 dual-port static RAM with master arbitration logic, 55 ns maximum access time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables simultaneous independent read/write access from left and right ports and serves as the MASTER unit in MASTER/SLAVE memory expansion for 16-bit-or-wider systems.

For engineers reviewing the 7130SA55J8/C datasheet, 7130SA55J8/C pinout, 7130SA55J8/C application, or 7130SA55J8/C equivalent, key selection considerations include BUSY arbitration timing (tBAA ≤ 55 ns), INT flag port-to-port communication support, dual-port asynchronous operation, and compatibility with IDT7140SLAVE devices in width-expanded configurations.

Technical Context

The 7130SA55J8/C implements on-chip port arbitration logic to resolve simultaneous access contention between its left and right ports, asserting BUSYL/BUSYR outputs when address matches occur. Its open-drain BUSY outputs require external pull-up resistors and are used to stall writes on the contending port.

It supports two independent asynchronous interfaces: left port (A0L–A9L, I/O0L–I/O7L, CEL/OEL/R/WL) and right port (A0R–A9R, I/O0R–I/O7R, CER/OER/R/WR), each with dedicated control, address, and data lines. The device operates fully asynchronously-no clock required-and includes INTL/INTR flags for inter-port signaling.

Key Specifications

Pinout & Package

7130SA55J8/C is packaged in a 48-pin ceramic flatpack (FP48), measuring approximately 0.75 in × 0.75 in × 0.11 in, with through-hole mounting and hermetic sealing 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 CY7C131-55JC and IDT7140SA55J8/C, the 7130SA55J8/C uniquely integrates arbitration logic and MASTER functionality-enabling standalone dual-processor coordination without external logic or dependency on a companion SLAVE device.

Availability

7130SA55J8/C is available at Aetrix Electronics and suitable for industrial PLCs, dual-processor embedded systems, military avionics, and automated test equipment requiring stable component supply across extended product lifecycles.

Supply support for 7130SA55J8/C 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, RF, and high-performance interconnect solutions, now part of Renesas Electronics.

The IDT7130 family was designed specifically for deterministic, contention-free dual-processor and real-time control applications requiring hardware-managed memory arbitration and low-latency shared access.

FAQ

What is the function of BUSYL and BUSYR on the 7130SA55J8/C?

BUSYL and BUSYR are open-drain arbitration flag outputs on the 7130SA55J8/C. When asserted low, they indicate that the opposite port has initiated a conflicting access to the same memory location. These signals must be pulled up externally and are used to stall writes on the contending port-ensuring data integrity without software intervention. They are outputs only; the 7130SA55J8/C does not accept BUSY as an input.

Can the 7130SA55J8/C operate as a standalone dual-port SRAM without a companion device?

Yes, the 7130SA55J8/C can operate as a fully functional standalone dual-port SRAM. Its integrated arbitration logic, BUSY outputs, and INTL/INTR flags enable complete port coordination internally. Unlike the SLAVE-only IDT7140, the 7130SA55J8/C requires no companion device for basic dual-port operation-though it may be paired with IDT7140SA55J8/C to expand data bus width beyond 8 bits.

What is the significance of the 'SA' suffix in 7130SA55J8/C?

The 'SA' in 7130SA55J8/C denotes the Standard Active power grade: typical active power consumption of 550 mW and standby current of 5 mW (typical) at 5V. This distinguishes it from the 'LA' (Low Active) variant, which offers lower standby current (1 mW typ.) and battery backup data retention down to 2V-features not present in the 7130SA55J8/C.

How does the 7130SA55J8/C handle simultaneous read/write to the same address from both ports?

The 7130SA55J8/C uses on-chip arbitration logic to detect address matches and assert BUSYL or BUSYR within ≤55 ns (tBAA). The port that asserts its chip enable (CE) first gains priority; the contending port's write is inhibited while BUSY is low. Reads remain valid, but writes are blocked-preventing data corruption. This hardware resolution eliminates race conditions without software overhead.

Is the 7130SA55J8/C compatible with modern 3.3V systems?

No, the 7130SA55J8/C is strictly a 5V TTL-compatible device with VIH minimum of 2.2V and VIL maximum of 0.8V. It is not 3.3V tolerant: applying 3.3V logic levels risks unreliable operation or damage. Interfacing with 3.3V controllers requires level-shifting circuitry on all control, address, and data lines-adding complexity and propagation delay.