Renesas 7130LA35J

Overview

7130LA35J 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, 35 ns maximum read cycle time, 1 mA typical standby current, and battery backup data retention down to 2 V. It enables concurrent asynchronous access from left and right ports in real-time interprocessor communication systems.

For engineers reviewing the 7130LA35J datasheet, 7130LA35J pinout, 7130LA35J application, or 7130LA35J equivalent, this page delivers verified timing parameters, port arbitration behavior, BUSY/INT flag operation, dual-supply retention capability, and direct replacement guidance for industrial embedded memory subsystems.

Technical Context

The 7130LA35J implements fully independent left/right ports with separate address, control, and I/O buses-each supporting TTL-compatible 5 V ±10% operation. Its on-chip arbitration logic resolves contention via BUSY flag assertion when both ports access the same address, with tAPS = 5 ns priority setup time and tBDD ≤ 35 ns disable-to-valid-data delay.

As a MASTER device, it features open-drain BUSYL/BUSYR outputs requiring external pull-up resistors, INTL/INTR interrupt flags for port-to-port signaling, and automatic power-down controlled by CEL/CER. The LA variant guarantees 2 V data retention with ICCDR ≤ 4000 µA at military temperature range.

Key Specifications

Pinout & Package

7130LA35J is supplied in a 48-pin ceramic flatpack (FP48) package measuring approximately 0.75 in × 0.75 in × 0.11 in, with through-hole mounting and side-braze construction compliant with MIL-PRF-38535 QML.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C131-35JC and AS7C31025B-35JC, the 7130LA35J uniquely integrates arbitration, dual interrupt signaling, and 2 V data retention within a single MIL-qualified package-enabling simpler, more reliable, and lower-power dual-processor memory interfaces.

Availability

7130LA35J is available at Aetrix Electronics and suitable for real-time interprocessor communication, avionics data logging, and industrial PLC redundancy modules requiring stable component supply, long-term obsolescence management, and military-grade reliability.

Supply support for 7130LA35J 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 for communications, computing, and industrial markets.

The 7130LA35J belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency, fault-tolerant memory sharing between heterogeneous processors in mission-critical systems.

FAQ

What is the guaranteed data retention voltage for the 7130LA35J?

The 7130LA35J guarantees data retention at VCC = 2.0 V minimum across its full military temperature range (−55°C to +125°C). This specification is validated per MIL-PRF-38535 QML requirements and enables operation during brown-out events or battery-backup scenarios without data loss. The 7130LA35J achieves this with ISB3 ≤ 0.2 mA typical standby current at 2 V.

Does the 7130LA35J require external pull-up resistors on BUSY and INT pins?

Yes, the 7130LA35J features open-drain BUSYL, BUSYR, INTL, and INTR outputs that require external pull-up resistors to VCC. A 4.7 kΩ resistor is recommended per pin to ensure VIH ≥ 2.2 V under load. This configuration allows wired-OR interrupt and arbitration signaling across multiple 7130LA35J devices on a shared bus without contention.

How does arbitration work between ports on the 7130LA35J?

Arbitration on the 7130LA35J is hardware-managed: when both ports attempt access to the same memory location, the port with earlier stable address and enable signals wins. The losing port asserts its BUSY output (low) after tBAA ≤ 35 ns, blocking writes until BUSY deasserts. tAPS = 5 ns ensures deterministic priority resolution, and tBDD ≤ 35 ns defines the delay from BUSY deassertion to valid read data.

Can the 7130LA35J operate with only one port enabled?

Yes, the 7130LA35J supports asymmetric operation: asserting CEL = VIH disables the left port (reducing ISB2 to 50 µA typical), while CER = VIH disables the right port. Both ports may be disabled simultaneously for full standby (ISB3 ≤ 0.2 mA). This flexibility allows dynamic power scaling in systems where only one processor is active at a time.

Is the 7130LA35J pin-compatible with the 7140LA35J SLAVE device?

No, the 7130LA35J (MASTER) and 7140LA35J (SLAVE) are not pin-compatible. While both use 48-pin FP48 packages, their pin functions differ significantly: BUSYL/BUSYR are outputs on the 7130LA35J but inputs on the 7140LA35J, and INTL/INTR behave as flags on the MASTER but as inputs on the SLAVE. Interfacing requires careful signal routing per functional role-not mechanical substitution.