Renesas 7130LA25JI

Overview

7130LA25JI 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, 25 ns maximum access time, 1 mA typical standby current, and 2 V data retention capability. It enables simultaneous independent read/write access from left and right ports in real-time inter-processor communication systems.

For engineers reviewing the 7130LA25JI datasheet, 7130LA25JI pinout, 7130LA25JI application, or 7130LA25JI equivalent, this page delivers verified specifications, package mapping, port arbitration timing, battery-backed operation details, and direct alternative part comparisons for embedded control, military avionics, and industrial PLC memory subsystems.

Technical Context

The 7130LA25JI implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (left/right), supporting concurrent access without external logic. Its on-chip arbitration logic resolves contention via BUSY flag assertion and priority set-up time (tAPS = 5 ns), ensuring deterministic write inhibition when address matches occur.

As a MASTER device, it features open-drain BUSYL/BUSYR outputs requiring pull-up resistors, INTL/INTR interrupt flags for port-to-port signaling, and R/W-controlled or CE-controlled write cycles. The LA variant supports 2 V battery backup with 100–4000 µA retention current across temperature grades.

Key Specifications

Pinout & Package

7130LA25JI is packaged in a 48-pin ceramic flatpack (FP48), measuring approximately 0.75 in × 0.75 in × 0.11 in, with all VCC and GND pins requiring dedicated power/ground connections per datasheet note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C131-25JC and IDT7140LA25JI, the 7130LA25JI uniquely integrates arbitration logic and open-drain BUSY outputs-enabling true standalone dual-port operation with deterministic conflict resolution and battery-backed reliability across industrial and military environments.

Availability

7130LA25JI is available at Aetrix Electronics and suitable for real-time inter-processor communication, military avionics data buffering, and industrial PLC shared memory requiring stable component supply across extended temperature and lifecycle-critical programs.

Supply support for 7130LA25JI 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 family was designed specifically for deterministic dual-port memory applications demanding hardware arbitration, low-power retention, and MIL-PRF-38535 qualification-targeting aerospace, defense, and industrial control markets.

FAQ

What is the guaranteed maximum access time for the 7130LA25JI across its rated temperature range?

The 7130LA25JI guarantees a maximum access time of 25 ns over the full industrial temperature range (–40°C to +85°C) and military range (–55°C to +125°C), as specified in AC Electrical Characteristics Table 09a under "7130X25" column. This value applies to tAA (address access), tACE (chip enable access), and tAOE (output enable access) parameters, ensuring timing compliance in deterministic real-time systems.

Does the 7130LA25JI support true battery backup operation, and what voltage is required?

Yes, the 7130LA25JI supports true battery backup operation with a minimum VDR of 2.0 V, enabling data retention during main power loss. Per Table 07, it draws 100–4000 µA ICCDR at 2.0 V depending on grade, and requires CE > VCC − 0.2 V to enter retention mode. No external regulators or charge pumps are needed-direct coin-cell connection suffices.

How does the on-chip arbitration logic in the 7130LA25JI resolve port contention?

The 7130LA25JI uses hardware arbitration based on address match detection and tAPS (5 ns priority setup time). When both ports access the same address, BUSYL or BUSYR is asserted low to inhibit the later-arriving write. The winning port is determined by which address/control signals stabilize first relative to tAPS, ensuring deterministic, zero-software-overhead conflict resolution without external logic.

What is the function of the INTL and INTR pins on the 7130LA25JI, and how are they triggered?

INTL and INTR are open-drain interrupt flags used for port-to-port event signaling. INTL asserts when A0L–A9L = 3FEh (hex), and INTR asserts when A0R–A9R = 3FFh. Both require external pull-ups and generate active-low pulses with tINS ≤ 25 ns (industrial grade), enabling hardware-synchronized task handoff between processors without polling.

Can the 7130LA25JI be used as a standalone dual-port RAM, or does it require pairing with an IDT7140?

The 7130LA25JI functions as a fully standalone dual-port RAM due to its integrated arbitration logic, BUSY outputs, and MASTER designation. It does not require pairing with IDT7140 unless expanding to 16-bit or wider data paths-where IDT7140LA25JI serves as SLAVE. Using 7130LA25JI alone satisfies 8-bit dual-access requirements in inter-processor buffers, avionics modules, and PLC controllers.