Renesas 7130SA35JI8

Overview

7130SA35JI8 from IDT is a high-speed 1K × 8 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 35 ns maximum access time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables full-speed 16-bit-or-wider memory expansion when paired with IDT7140 SLAVE devices in real-time digital signal processing systems.

For engineers reviewing the 7130SA35JI8 datasheet, 7130SA35JI8 pinout, 7130SA35JI8 application, or 7130SA35JI8 equivalent, key selection criteria include BUSY flag timing (tBAA ≤ 35 ns), port-to-port arbitration priority setup (tAPS = 5 ns), dual independent asynchronous access, open-drain BUSY output requiring pull-up, and compatibility with IDT7140 for scalable bus width.

Technical Context

The 7130SA35JI8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses for left and right ports. Its on-chip arbitration logic resolves contention via BUSY output assertion when address matches occur, with tBDD ≤ 35 ns ensuring valid read data after BUSY deassertion.

It supports R/W-controlled and CE-controlled write cycles, features open-drain BUSYL/BUSYR outputs (requiring external pull-ups), and provides INTL/INTR flags for inter-port communication. The device operates in active, standby (ISB1 ≤ 25 mA), and full-standby (ISB3 ≤ 1.0 mA) modes controlled by CE and input voltage thresholds.

Key Specifications

Pinout & Package

7130SA35JI8 is packaged in a 48-pin ceramic flatpack (FP48) with 0.75″ × 0.75″ footprint and 0.11″ height. Pin assignments are validated per IDT document 2689 drw 03F.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C131-35JC and IDT7140SA35JI8, the 7130SA35JI8 uniquely integrates arbitration and BUSY generation, enabling simpler, more reliable dual-processor memory sharing without external logic or strict sequencing requirements.

Availability

7130SA35JI8 is available at Aetrix Electronics and suitable for real-time DSP subsystems, redundant industrial controllers, communications protocol offload engines, and test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7130SA35JI8 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 IDT7130 product line delivers high-speed dual-port SRAMs optimized for deterministic, low-latency shared memory in multi-processor systems-designed specifically for applications demanding hardware-enforced arbitration and seamless MASTER/SLAVE scalability.

FAQ

What is the maximum operating temperature range for the 7130SA35JI8?

The 7130SA35JI8 is rated for industrial temperature operation from –40°C to +85°C, verified per IDT specification 2689 tbl 03. This range supports deployment in harsh environments such as factory automation controllers and outdoor telecom equipment where ambient thermal stress exceeds commercial-grade limits. The 7130SA35JI8 maintains full 35 ns access timing across this entire range under 5V ±10% supply conditions.

Does the 7130SA35JI8 require external pull-up resistors on BUSY and INT pins?

Yes, the 7130SA35JI8 features open-drain BUSYL, BUSYR, INTL, and INTR outputs, as confirmed in Notes 1 and 2 of the functional block diagram and pin configuration diagrams. Each requires an external pull-up resistor to VCC (typically 4.7 kΩ) to establish a valid HIGH logic level. Failure to install pull-ups will result in undefined or floating states, disrupting arbitration and interrupt functionality in systems relying on these signals.

Can the 7130SA35JI8 operate as a standalone 8-bit memory without pairing with an IDT7140?

Yes, the 7130SA35JI8 functions as a complete stand-alone 1K × 8 dual-port SRAM with full arbitration capability. Its on-chip logic, BUSY outputs, and independent port controls allow autonomous operation in 8-bit systems. The MASTER/SLAVE expansion mode with IDT7140 is optional-used only when widening the data bus to 16 bits or more-and does not affect the 7130SA35JI8's ability to serve as a self-contained dual-access memory resource.

What is the significance of tAPS = 5 ns in the 7130SA35JI8 timing specifications?

tAPS (Arbitration Priority Set-up Time) is the minimum time the 7130SA35JI8 requires between matching addresses appearing on both ports to guarantee deterministic BUSY assignment. At 5 ns, it ensures that when left and right ports access the same location simultaneously, the device reliably asserts BUSY on one port to inhibit writes-preventing data corruption. This parameter is critical for real-time systems where predictable arbitration behavior is mandatory, and is explicitly defined in IDT 2689 tbl 11a for the 35 ns speed grade.

How does the 7130SA35JI8 handle power consumption during standby modes?

The 7130SA35JI8 offers three distinct standby modes: ISB1 (both ports disabled, TTL CE inputs) draws ≤25 mA; ISB2 (one port active) draws ≤50 mA; and ISB3 (full CMOS-level standby) draws ≤1.0 mA. These values are specified in IDT 2689 tbl 06a for the SA variant at industrial temperature. The low ISB3 current enables battery-backed retention readiness, though data retention itself (2V min) applies only to LA variants-not the 7130SA35JI8.