Renesas 7130SA20J8

Overview

7130SA20J8 from IDT (Integrated Device Technology) is a high-speed 1K × 8 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 20 ns maximum read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables simultaneous independent access from left and right ports in real-time interprocessor communication systems.

For engineers reviewing the 7130SA20J8 datasheet, 7130SA20J8 pinout, 7130SA20J8 application, or 7130SA20J8 equivalent, this page delivers verified timing parameters, port arbitration behavior, BUSY/INT flag operation, and package-specific DC/AC electrical characteristics required for deterministic dual-ported memory integration.

Technical Context

The 7130SA20J8 implements fully asynchronous dual-port architecture with separate address, data, and control lines per port (A0L–A9L/I/O0L–I/O7L/CEL/OEL/R/WL/BUSYL/INTL and A0R–A9R/I/O0R–I/O7R/CER/OER/R/WR/BUSYR/INTR). Its on-chip arbitration logic resolves contention when both ports access the same memory location, asserting BUSY outputs to stall the later-arriving write.

As a MASTER device, it features open-drain BUSY outputs requiring external pull-up resistors, supports port-to-port interrupt signaling via INTL/INTR flags, and provides battery-backed data retention only in LA variants - not applicable to the SA suffix. The J8 suffix denotes a 48-pin ceramic flatpack (FP48) package.

Key Specifications

Pinout & Package

7130SA20J8 is supplied in a 48-pin ceramic flatpack (FP48) package with 0.75″ × 0.75″ body size and 0.11″ height, rated for industrial temperature operation and compliant with MIL-PRF-38535 QML for reliability-critical applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C131-25JC and IDT7140SA20J8, the 7130SA20J8 uniquely integrates arbitration logic and open-drain BUSY/INT outputs in a single FP48 package - reducing BOM count and eliminating timing-critical external logic for deterministic dual-ported operation.

Availability

7130SA20J8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, digital signal processing buffering, military avionics data exchange, and industrial PLC dual-core coordination requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7130SA20J8 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, now part of Renesas Electronics.

The IDT7130/7140 family was designed specifically for deterministic, low-latency interprocessor communication in embedded systems requiring hardware-managed dual-port memory access without software overhead.

FAQ

What is the maximum operating frequency supported by the 7130SA20J8?

The 7130SA20J8 does not operate at a fixed clock frequency. Instead, its 20 ns maximum read cycle time (tRC) implies a theoretical upper limit of 50 MHz for consecutive read operations on a single port. However, actual throughput depends on address stability, control signal timing margins, and whether operations are interleaved across ports. Real-world sustained bandwidth is governed by tRC, tAA, and tACE specifications - all guaranteed ≤20 ns for commercial-grade speed bins.

Does the 7130SA20J8 support battery backup for data retention?

No, the 7130SA20J8 does not support battery backup data retention. That feature is exclusive to LA-suffix variants (e.g., 7130LA20J8), which specify 2.0 V minimum VCC for data retention and consume ≤4000 µA in that mode. The SA suffix indicates standard active power profile with no data retention capability below 4.5 V.

How are BUSY signals used in arbitration between ports of the 7130SA20J8?

In the 7130SA20J8, BUSYL and BUSYR are open-drain outputs that go LOW when the corresponding port's access conflicts with an ongoing operation on the opposite port to the same memory address. The device uses tAPS (arbitration priority setup time, min. 5 ns) to determine which port wins; if timing is violated, BUSY assertion is non-deterministic. External pull-up resistors are mandatory, and BUSY must be sampled synchronously with the local port's control signals to avoid metastability.

Can the 7130SA20J8 be used without external pull-up resistors on BUSY and INT pins?

No, the 7130SA20J8 cannot function correctly without external pull-up resistors on BUSYL, BUSYR, INTL, and INTR pins. These outputs are explicitly defined as open-drain in the datasheet (Note 1, Functional Block Diagram), meaning they can only actively drive LOW or float. Without pull-ups, BUSY and INT signals remain undefined, preventing proper arbitration and interrupt signaling - leading to data corruption or missed events in multi-processor systems.

What is the difference between the 7130SA20J8 and the 7140SA20J8 in a MASTER/SLAVE configuration?

The 7130SA20J8 is the MASTER device with on-chip arbitration logic and open-drain BUSY/INT outputs, while the 7140SA20J8 is the SLAVE device with BUSY/INT pins configured as inputs and no internal arbitration. In a 16-bit expansion, the 7130SA20J8 controls arbitration and generates BUSY/INT signals; the 7140SA20J8 responds to those signals but cannot initiate them. They share identical timing (20 ns) and pinout compatibility but are not interchangeable - using two 7130SA20J8s causes BUSY contention.