Renesas 7025S35GB

Overview

7025S35GB from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with simultaneous independent read access on both ports, 35 ns maximum read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables full-speed error-free memory expansion in 32-bit+ systems via master/slave cascading and supports semaphore-based inter-processor communication in real-time embedded control.

For engineers reviewing the 7025S35GB datasheet, 7025S35GB pinout, 7025S35GB application, or 7025S35GB equivalent, key selection criteria include dual-port arbitration latency, BUSY flag timing under address contention, byte-selectable I/O control, 2V data retention capability, and compatibility with 84-pin PGA packaging for legacy military/industrial board layouts.

Technical Context

The 7025S35GB implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port - enabling concurrent read/write operations without internal synchronization overhead. Its on-chip arbitration logic resolves port conflicts using hardware BUSY flag assertion and priority set-up timing (tAPS = 5 ns), eliminating need for external logic in multi-processor shared-memory designs.

It integrates dedicated semaphore registers (8 flags, addressed via A0–A2) with atomic read/write support and interrupt flag generation (INTL/INTR), all operating under independent CE/R/W/OE control per port. The device supports battery backup mode (2V VCC, ICCDR ≤ 4 mA) with guaranteed data retention across –55°C to +125°C for MIL-grade variants.

Key Specifications

Pinout & Package

7025S35GB is packaged in an 84-pin ceramic Pin Grid Array (PLG84), measuring approximately 1.15 in × 1.15 in × 0.17 in, with hermetic sealing suitable for high-reliability industrial and military applications. All VCC pins require decoupling; all GND pins must be connected to system ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-35JC and AS7C38097A-35PC, the 7025S35GB delivers integrated hardware arbitration and MIL-qualified reliability in a hermetic PGA package - making it uniquely suited for safety-critical upgrades of fielded military and aerospace platforms where pinout and timing compatibility are non-negotiable.

Availability

7025S35GB is available at Aetrix Electronics and suitable for radar signal processing, industrial PLC memory buffering, and aerospace flight control computer applications requiring stable component supply, long-term obsolescence management, and traceable sourcing from authorized channels.

Supply support for 7025S35GB 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 high-performance memory, timing, and interface solutions before its acquisition by Renesas Electronics in 2019. Known for reliability in demanding environments, IDT served defense, telecom, and industrial markets.

The 7025S35GB belongs to IDT's legacy 7000-series dual-port SRAM family, engineered specifically for real-time embedded systems requiring deterministic latency, hardware-coordinated multiprocessing, and operation across extended temperature and voltage ranges.

FAQ

What is the maximum operating temperature range for the 7025S35GB?

The 7025S35GB is rated for industrial temperature operation from –40°C to +85°C. This range is explicitly confirmed in the datasheet's "Recommended DC Operating Conditions" table (2683 tbl 05) and applies to the "S" speed grade variant. It does not support the wider military range (–55°C to +125°C) unless specified as a MIL-qualified part number suffix (e.g., 7025S35J).

Does the 7025S35GB support battery backup operation, and what voltage is required?

Yes, the 7025S35GB supports battery backup operation with guaranteed data retention at VCC = 2.0 V, as specified in Table 10 ("Data Retention Characteristics"). This mode draws ≤ 4 mA (ICCDR max) and maintains stored data across power loss events - a key requirement for avionics and industrial control systems where volatile memory persistence is critical.

How does the BUSY arbitration mechanism work on the 7025S35GB?

The 7025S35GB uses hardware-driven BUSY arbitration: when M/S = H (master), BUSYR asserts to block conflicting writes on the slave port; when M/S = L (slave), BUSYL serves as input. Timing parameters like tBAA (≤20 ns) and tBDD (≤35 ns) define response latency. This eliminates need for software polling and ensures deterministic resolution of simultaneous access to the same address.

Can the 7025S35GB be used in a 32-bit data path configuration?

Yes, the 7025S35GB supports 32-bit expansion via master/slave cascading. Two devices can be configured - one as master (M/S = H), one as slave (M/S = L) - using the BUSY handshake to coordinate access. The datasheet confirms this topology enables "full-speed, error-free operation without additional discrete logic," making it ideal for upgrading legacy 16-bit systems to 32-bit word widths.

What package type is used for the 7025S35GB, and are there alternatives?

The 7025S35GB uses an 84-pin ceramic Pin Grid Array (PLG84) package, measuring ~1.15″ × 1.15″ × 0.17″, as shown in Figure 3 ("84-Pin PGA Top View"). While the IDT 7025 family also offered PLCC, Flatpack, and TQFP variants, the "GB" suffix in 7025S35GB specifically denotes the ceramic PGA option - selected for hermeticity and thermal stability in high-reliability deployments.