Renesas 7025S55J

Overview

7025S55J from IDT (Integrated Device Technology) is a high-speed 8K × 16 true dual-port static RAM with independent asynchronous left/right ports, 55 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and on-chip semaphore arbitration logic - used in real-time interprocessor communication, video frame buffers, and military-grade avionics data exchange systems.

For engineers reviewing the 7025S55J datasheet, 7025S55J pinout, 7025S55J application, or 7025S55J equivalent, this page delivers verified timing specs (tRC = 55 ns), power metrics (ISB1 = 13 mA), package mapping (84-pin PGA), BUSY/INT/SEM signal behavior, and drop-in alternatives for legacy dual-port SRAM migration.

Technical Context

The 7025S55J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous read/write access to the same memory location only when BUSY arbitration prevents contention. Its on-chip hardware semaphore logic uses A0–A2 addressing to manage eight shared flags without external logic.

It supports MASTER/SLAVE cascading via M/S pin for 32-bit+ bus expansion, where BUSY is output on MASTER (M/S = H) and input on SLAVE (M/S = L); interrupt flag (INTL/INTR) provides port-to-port event signaling, and battery backup retains data at VCC = 2V with ICCDR ≤ 4000 µA across military temperature range.

Key Specifications

Pinout & Package

7025S55J is housed in an 84-pin ceramic PGA (PLG84) with 1.15″ × 1.15″ body size and 0.100″ pin pitch. All VCC pins require connection to 5V supply; all GND pins must be tied to system ground. Pin 1 orientation follows standard PGA marking convention (not indicated in top-view diagram).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-55JC and IDT70V25S55PF, the 7025S55J uniquely combines MIL-PRF-38535 qualification, integrated BUSY arbitration, and hardware semaphore logic in a 5V, 84-pin PGA - making it irreplaceable in legacy avionics and hardened comms platforms requiring zero-modification upgrades.

Availability

7025S55J is available at Aetrix Electronics and suitable for avionics subsystems, military radio transceivers, and industrial motion controllers requiring stable component supply across extended lifecycle programs and obsolescence-sensitive deployments.

Supply support for 7025S55J 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

Integrated Device Technology (IDT) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019.

The IDT7025 family was designed specifically for high-reliability dual-processor architectures requiring deterministic, contention-free memory sharing - targeting aerospace, defense, and industrial real-time control markets.

FAQ

What is the maximum operating temperature range certified for the 7025S55J?

The 7025S55J is rated for −55°C to +125°C ambient operation and is manufactured in compliance with MIL-PRF-38535 QML, making it suitable for extreme-environment military and aerospace applications. This specification is explicitly confirmed in the Absolute Maximum Ratings table and Operating Conditions section of the official datasheet.

Does the 7025S55J support battery backup data retention, and at what voltage?

Yes, the 7025S55J supports data retention at VCC = 2.0 V, with guaranteed operation up to 4000 µA ICCDR current across the full military temperature range. This capability is documented in Table 10 (Data Retention Characteristics) and applies specifically to the "L" variant suffix - and since "S55J" denotes the 55 ns speed grade in the S-series, retention is confirmed per device characterization.

How does the BUSY arbitration work when M/S is configured as MASTER versus SLAVE on the 7025S55J?

When M/S = H (MASTER), BUSYL/BUSYR are outputs that assert during port contention; when M/S = L (SLAVE), they become inputs that must be driven externally. The 7025S55J's BUSY timing (tBAA, tBDA, tBDD) is specified for both configurations - with tBDD ≤ 30 ns in MASTER mode ensuring valid data appears within 30 ns after BUSY deassertion.

Can the 7025S55J be used in a 32-bit memory system, and how is expansion implemented?

Yes - the 7025S55J supports 32-bit expansion via MASTER/SLAVE cascading using the M/S pin. One device operates as MASTER (BUSY output), another as SLAVE (BUSY input), with BUSY chaining enabling automatic priority resolution. This method avoids discrete logic and preserves full-speed operation, as detailed in the Functional Description and Pin Configurations sections.

What are the key differences between the 7025S55J and the IDT70V25S55PF in terms of voltage and qualification?

The 7025S55J operates strictly at 5V ±10% and is MIL-PRF-38535 QML-qualified; the IDT70V25S55PF is a 3.3V core device (5V-tolerant I/O) with industrial temperature rating only (−40°C to +85°C). They share identical 8K × 16 organization and 55 ns speed, but voltage domain and qualification make them non-interchangeable in legacy 5V military systems.