Renesas 7130SA100J/2839

Overview

7130SA100J/2839 from IDT is a high-speed 1K × 8 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 100ns maximum read/write cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C), used in real-time interprocessor communication systems requiring concurrent access from two independent buses.

For engineers reviewing the 7130SA100J/2839 datasheet, 7130SA100J/2839 pinout, 7130SA100J/2839 application, or 7130SA100J/2839 equivalent, key selection criteria include BUSY arbitration timing (tBDD ≤ 65ns), dual-port I/O isolation, INT flag support for port-to-port signaling, and compatibility with IDT7140 SLAVE devices in 16-bit memory expansion.

Technical Context

The 7130SA100J/2839 implements fully asynchronous dual-port operation with independent left/right address, control, and data buses. Its on-chip arbitration logic resolves contention via BUSY output assertion when both ports access the same address, with tAPS = 5ns priority setup time and tBDD ≤ 65ns disable-to-valid-data delay.

It supports R/W-controlled and CE-controlled write cycles, features open-drain BUSY outputs requiring external pull-up resistors, and includes dedicated INTL/INTR flags for interrupt-driven inter-port coordination - all operating without external logic in MASTER configuration.

Key Specifications

Pinout & Package

7130SA100J/2839 is packaged in a 48-pin ceramic flatpack (FP48) with 0.75" × 0.75" body size and side-brazed construction, rated for high-reliability industrial use.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C131-100AXC and IDT7140SA100J, the 7130SA100J/2839 uniquely delivers self-contained arbitration, interrupt signaling, and stand-alone MASTER operation - essential for real-time interprocessor communication where deterministic latency and hardware-enforced coherency are required.

Availability

7130SA100J/2839 is available at Aetrix Electronics and suitable for real-time interprocessor communication, digital signal processing buffering, industrial PLC I/O mapping, and military avionics data exchange requiring stable component supply across extended product lifecycles.

Supply support for 7130SA100J/2839 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 silicon solutions for communications, computing, and industrial markets.

The 7130SA/LA product line was engineered specifically for deterministic, low-latency interprocessor communication in harsh-environment embedded systems - emphasizing hardware arbitration, interrupt signaling, and industrial/military temperature reliability.

FAQ

What is the function of BUSYL and BUSYR on the 7130SA100J/2839?

BUSYL and BUSYR are open-drain output flags indicating write contention on the respective port. When asserted LOW, they inhibit writes to that port during simultaneous access to the same memory location. The 7130SA100J/2839 uses these signals to implement hardware arbitration without external logic, with tBDD ≤ 65ns guaranteeing valid data after BUSY deassertion.

Can the 7130SA100J/2839 operate as a standalone dual-port memory without a companion SLAVE device?

Yes, the 7130SA100J/2839 functions as a complete stand-alone dual-port SRAM in MASTER configuration. It does not require an IDT7140 SLAVE device unless expanding the data bus beyond 8 bits. Its on-chip arbitration logic, BUSY outputs, and INT flags are fully operational in isolation, making it ideal for two-processor systems sharing a common 8-bit memory space.

What are the voltage and timing requirements for the pull-up resistors on BUSYL and BUSYR pins of the 7130SA100J/2839?

BUSYL and BUSYR require external pull-up resistors to VCC (4.5–5.5V). A 1.25kΩ resistor is recommended per the datasheet's AC test load (5V, 1250Ω), ensuring VOL ≤ 0.5V at IOL = 16mA. Timing is unaffected by pull-up value within 1–10kΩ range, but lower values improve noise immunity in electrically noisy industrial environments where the 7130SA100J/2839 is commonly deployed.

How does the 7130SA100J/2839 handle simultaneous read and write operations to the same memory address?

When both ports access the same address, the 7130SA100J/2839 asserts the BUSY flag on the later-arriving port based on tAPS = 5ns arbitration priority setup time. The earlier port completes its operation; the later port's write is inhibited, and its BUSY output goes LOW. Valid data from the winning port appears after tBDD ≤ 65ns, ensuring deterministic resolution without data corruption.

Is the 7130SA100J/2839 pin-compatible with other speed grades in the IDT7130SA family?

Yes, all IDT7130SA variants (e.g., 7130SA20, 7130SA25, 7130SA35, 7130SA55, 7130SA100) share identical FP48 pinout, electrical interface, and functional architecture. Only access timing parameters differ - allowing drop-in replacement for performance tuning or cost optimization without PCB redesign. The 7130SA100J/2839 maintains full backward compatibility with faster variants in timing-critical paths.