Renesas 7025L35JI8

Overview

7025L35JI8 from IDT is a high-speed 8K × 16 (128 Kbit) true dual-port static RAM with independent asynchronous left/right ports, 35 ns maximum read cycle time, 2V data retention for battery backup operation, and industrial temperature range (–40°C to +85°C). It supports full on-chip semaphore signaling and port arbitration, enabling concurrent access in real-time interprocessor communication systems.

For engineers reviewing the 7025L35JI8 datasheet, 7025L35JI8 pinout, 7025L35JI8 application, or 7025L35JI8 equivalent, key selection criteria include dual-port arbitration latency, BUSY flag timing under M/S = VIH configuration, byte-selectable I/O control, low standby current (1 µA typ.), and compatibility with 5 V ±10% TTL-level logic interfaces.

Technical Context

The 7025L35JI8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port-enabling simultaneous read/write operations to the same memory location only when arbitration permits. Its on-chip hardware semaphore logic uses A0–A2 addressing to manage eight shared flags without external logic.

Port arbitration is resolved via dedicated BUSY outputs (Master) or inputs (Slave), with tBDD ≤ 35 ns (M/S = VIH) ensuring valid data delivery after contention. The device operates in three power states: active (ICC ≤ 150 mA typ.), standby (ISB1 ≤ 13 mA), and full standby (ISB3 ≤ 0.2 mA), all compliant with 5 V ±10% supply and TTL-compatible thresholds.

Key Specifications

Pinout & Package

7025L35JI8 is packaged in an 84-pin ceramic PGA (PLG84) with 1.15 in × 1.15 in footprint and 0.17 in height. Pin assignments are symmetric for left (L) and right (R) ports, supporting master/slave cascading via M/S pin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AXC and IDT70V25L35PF, the 7025L35JI8 delivers integrated hardware semaphores and ceramic PGA ruggedness-making it optimal for deterministic real-time systems where arbitration latency and thermal reliability outweigh density or package-size trade-offs.

Availability

7025L35JI8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, digital signal processing buffering, and avionics flight control interface applications requiring stable component supply across extended product lifecycles.

Supply support for 7025L35JI8 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 interconnect solutions, now part of Renesas Electronics.

The IDT7025 family was designed specifically for deterministic dual-ported memory applications in real-time embedded systems-emphasizing hardware arbitration, low-latency contention resolution, and battery-backed data integrity.

FAQ

What is the operating temperature range for the 7025L35JI8?

The 7025L35JI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and DC Electrical Characteristics section of the official IDT datasheet DSC 2683/13. The ceramic PGA package contributes to thermal stability across this full range, making the 7025L35JI8 suitable for harsh-environment applications such as factory automation controllers and transportation electronics where ambient conditions exceed commercial-grade limits.

Does the 7025L35JI8 support battery backup operation?

Yes, the 7025L35JI8 supports battery backup operation with guaranteed data retention at VCC = 2.0 V, as specified in Table 10 (Data Retention Characteristics). This feature is exclusive to the "L" (low-power) variant and enables nonvolatile holdover during main power interruption. The device draws ≤100 µA typical in retention mode, allowing multi-day backup from small coin-cell batteries-critical for applications like utility metering and emergency control systems where data persistence is mandatory.

How does the BUSY flag function on the 7025L35JI8?

On the 7025L35JI8, the BUSY flag behavior depends on the M/S pin state: when M/S = H (Master), BUSYR is an output that asserts when the right port attempts access to an address currently being written by the left port; when M/S = L (Slave), BUSYR becomes an input used to stall writes until the master releases the contested address. Timing parameters tBAA, tBDA, and tBDD (all ≤35 ns max) define response and resolution windows-ensuring predictable arbitration without software intervention.

What package type is used for the 7025L35JI8?

The 7025L35JI8 uses an 84-pin ceramic pin-grid array (PGA) package, designated PLG84 in IDT documentation. Its mechanical dimensions are approximately 1.15 in × 1.15 in × 0.17 in, with gold-plated pins for high-reliability solder joints. This hermetically sealed ceramic construction provides superior moisture resistance and thermal cycling performance versus plastic packages-making it preferred for military, aerospace, and long-lifecycle industrial deployments where field reliability is paramount.

Can the 7025L35JI8 be used in a 32-bit data bus configuration?

Yes, the 7025L35JI8 supports 32-bit bus expansion via Master/Slave cascading. When two devices are connected with M/S = H on one (Master) and M/S = L on the other (Slave), the BUSY signal from the Master coordinates access across both chips. The IDT7025 family's dedicated M/S pin and matching BUSY logic eliminate the need for external arbitration gates-enabling full-speed, error-free 32-bit word access without added propagation delay or layout complexity, as confirmed in the Functional Description and Pin Configurations sections of DSC 2683/13.