Renesas 7025S25GB

Overview

7025S25GB from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with 25 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and full on-chip semaphore and arbitration logic for inter-port synchronization. It supports simultaneous independent reads/writes to the same memory location and enables 32-bit+ bus expansion via Master/Slave cascading in real-time control systems.

For engineers reviewing the 7025S25GB datasheet, 7025S25GB pinout, 7025S25GB application, or 7025S25GB equivalent, key selection considerations include its 25 ns access timing, industrial temperature range (–40°C to +85°C), 84-pin PGA package, battery-backed data retention at 2V, and hardware semaphore support for multi-processor shared-memory designs.

Technical Context

The 7025S25GB implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling concurrent read/write operations without external arbitration logic. Its on-chip arbitration resolves contention via BUSY flag assertion and priority set-up timing (tAPS = 5 ns).

It integrates dedicated semaphore registers (8 flags, addressed by A0–A2), interrupt flag generation, and Master/Slave select (M/S) for hierarchical system configuration. The device uses CMOS process technology and supports both TTL-level and CMOS-level standby control for flexible power management.

Key Specifications

Pinout & Package

7025S25GB is supplied in an 84-pin ceramic Pin Grid Array (PGA) package (PLG84), with 4 corner ground pins, dual VCC rails (pins 13, 26, 46, 72), and symmetrical left/right port I/O banks. All GND pins must be connected; unused N/C pins are not internally bonded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-25JC and AS7C38096B-25PCN, the 7025S25GB uniquely delivers integrated semaphore registers, BUSY-based arbitration, and Master/Slave cascading in a single 5V-compatible 84-pin PGA package - making it irreplaceable in deterministic real-time shared-memory architectures requiring zero-software arbitration overhead.

Availability

7025S25GB is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, avionics, and medical imaging systems requiring stable component supply, long-term lifecycle assurance, and military-grade reliability under extended temperature stress.

Supply support for 7025S25GB 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance silicon solutions before its acquisition by Renesas Electronics in 2019.

The 7025S25GB belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in mission-critical embedded systems demanding hardware-enforced memory coherency.

FAQ

What is the operating temperature range specified for the 7025S25GB?

The 7025S25GB is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "Recommended DC Operating Conditions" table (Table 05) and applies to all speed grades including the 25 ns version. It is not rated for commercial (0°C to +70°C) or military (–55°C to +125°C) ranges unless explicitly ordered with corresponding suffixes.

Does the 7025S25GB support battery backup operation, and what is the minimum retention voltage?

Yes, the 7025S25GB supports battery backup operation with guaranteed data retention at VCC = 2.0 V minimum, as specified in Table 10 ("Data Retention Characteristics"). This feature is inherent to the "L" (low-power) variant designation, and the "S" in 7025S25GB indicates standard power - however, the datasheet confirms that both S and L versions retain data at 2V, with L offering lower standby current (1 µA vs 5 µA).

How does the Master/Slave (M/S) pin function in the 7025S25GB, and what happens when it is tied high versus low?

When M/S = H, the 7025S25GB operates as a Master: BUSY is an output that asserts during port contention, signaling the Slave to defer writes. When M/S = L, it operates as a Slave: BUSY becomes an input used to gate local write operations. This configuration enables hierarchical arbitration in multi-device 32-bit+ memory systems without external logic, as detailed in the Functional Block Diagram and Truth Table II.

Can the 7025S25GB perform simultaneous reads from both ports to the same memory address?

Yes, the 7025S25GB supports true simultaneous reads from both ports to the same memory location - a defining feature of its "true dual-ported memory cells" architecture, explicitly stated in the Features section. This capability requires no arbitration and incurs no timing penalty, unlike simultaneous read/write which triggers BUSY-based arbitration.

What package type is used for the 7025S25GB, and are there any critical PCB layout requirements?

7025S25GB uses an 84-pin ceramic Pin Grid Array (PLG84) package. Critical layout requirements include connecting all four VCC pins (13, 26, 46, 72) and all GND pins (e.g., pins 12, 25, 45, 71, 75, 83) to low-impedance planes, maintaining symmetric trace lengths for address/data buses per port, and avoiding routing high-speed signals near BUSY/INT lines to prevent false arbitration triggering.