Renesas 7025S25G

Overview

7025S25G from IDT is a high-speed 8K × 16 (128 Kbit) true dual-port static RAM with independent asynchronous left/right ports, 25 ns max read cycle time (tRC), TTL-compatible 5 V ±10% supply, and on-chip semaphore/arbitration logic - used in real-time multiprocessing systems requiring concurrent memory access without external logic.

For engineers reviewing the 7025S25G datasheet, 7025S25G pinout, 7025S25G application, or 7025S25G equivalent, key selection criteria include simultaneous port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S = VIH, dual-byte control (UBL/LBL), and industrial temperature support (–40°C to +85°C) for embedded control and avionics data buffering.

Technical Context

The 7025S25G implements fully asynchronous dual-port architecture with separate address, data, and control buses per port. It supports master/slave cascading via M/S pin for 32-bit+ bus expansion, and includes dedicated hardware semaphore logic (8 flags, addressed by A0–A2) with tSWRD = 5 ns write-to-read latency.

Arbitration is handled entirely on-die: BUSY assertion occurs on address or chip-enable contention (tBAA ≤ 20 ns), and port-to-port delay (tWDD ≤ 50 ns, tDDD ≤ 35 ns) ensures deterministic resolution of simultaneous accesses to the same location - critical for lock-free inter-processor communication.

Key Specifications

Pinout & Package

7025S25G is packaged in an 84-pin ceramic PGA (PLG84) with 1.15″ × 1.15″ footprint and 0.100″ pin pitch. Pin assignments are symmetric for left (L) and right (R) ports, supporting identical layout routing for both sides.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-25JC and AS7C3256B-25JC, the 7025S25G uniquely delivers integrated hardware arbitration and semaphore logic in a 5 V, 25 ns dual-port package - making it irreplaceable for deterministic, low-latency inter-processor communication without added components or timing uncertainty.

Availability

7025S25G is available at Aetrix Electronics and suitable for real-time multiprocessor systems, avionics data buffering, industrial PLC memory expansion, and digital signal processing co-processor interfaces requiring stable component supply across extended product lifecycles.

Supply support for 7025S25G 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 sensor solutions, acquired by Renesas Electronics in 2019.

The 7025S25G belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency memory sharing in military, industrial, and telecommunications infrastructure where hardware-enforced arbitration is mandatory.

FAQ

What is the maximum operating temperature range for the 7025S25G?

The 7025S25G is rated for industrial temperature operation from –40°C to +85°C. This range is fully specified for all AC and DC parameters including 25 ns read cycle time (tRC), BUSY arbitration timing (tBAA ≤ 20 ns), and standby current (ISB3 ≤ 1.0 mA). It is not qualified for extended military ranges (–55°C to +125°C) - those require the 7025S35G or 7025S55G variants.

Does the 7025S25G support battery backup data retention?

No, the 7025S25G does not support battery backup data retention. That feature is exclusive to the "L" variant (e.g., 7025L25G), which specifies 2 V data retention and typical standby current of 500 µW. The "S" suffix in 7025S25G denotes standard power operation with 5 V supply and typical active power of 775 mW.

How does the M/S pin affect BUSY signal behavior on the 7025S25G?

When M/S = HIGH, the 7025S25G operates as a Master: BUSYL and BUSYR become push-pull outputs that assert during port contention. When M/S = LOW, it operates as a Slave: BUSYL and BUSYR become inputs, allowing daisy-chained arbitration where upstream Master drives BUSY to downstream Slaves. This configuration is required for cascading multiple 7025S25G devices into wider memory systems.

Can the 7025S25G perform simultaneous reads from both ports to the same memory location?

Yes, the 7025S25G supports true simultaneous reads from both ports to the same address location without conflict or performance penalty. Its dual-port memory cell architecture guarantees concurrent access with full 25 ns timing compliance on both ports - a core feature distinguishing it from pipelined or pseudo-dual-port SRAMs that serialize such operations.

What package type is used for the 7025S25G, and are there pin-compatible alternatives?

The 7025S25G uses an 84-pin ceramic PGA (PLG84) package with 0.100″ pin pitch and 1.15″ × 1.15″ body. While IDT offered the same speed grade in PLCC and TQFP variants (e.g., 7025S25J, 7025S25P), these are not pin-compatible due to differing pinouts and signal assignments - direct substitution requires PCB redesign and layout verification per package drawing DSC 2683/13.