Renesas 7025L35GB

Overview

IDT7025L35GB from Integrated Device Technology (IDT) is a high-speed, 8K × 16-bit (128 Kbit), true dual-port static RAM with independent left/right ports, 35 ns maximum read cycle time, 2V data retention capability, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access to the same memory location-critical for real-time inter-processor communication in embedded control systems.

For engineers reviewing the IDT7025L35GB datasheet, IDT7025L35GB pinout, IDT7025L35GB application, or IDT7025L35GB equivalent, key selection considerations include its dual-port arbitration logic, on-chip semaphore support, BUSY flag timing (tBAA ≤ 20 ns), low standby current (1 µA typical), and compatibility with 5 V ±10% TTL-level systems requiring deterministic port contention resolution.

Technical Context

The IDT7025L35GB implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves port contention via hardware-controlled BUSY assertion (M/S = H for master output; M/S = L for slave input) and supports semaphore flag management across eight dedicated flags addressed by A0–A2.

It features separate upper-byte (UB/UBR) and lower-byte (LB/LBR) enables for multiplexed bus interfacing, full TTL compatibility, and automatic power-down via chip enable (CE), achieving 1 µA typical standby current in full CMOS-input mode (ISB3) while retaining data at 2 V.

Key Specifications

Pinout & Package

Package: 84-pin Ceramic PGA (PLG84), body size ≈ 1.15 in × 1.15 in × 0.17 in; pin-compatible with 84-pin Flatpack and PLCC variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-250BZXI and AS7C3256A-20JIN, the IDT7025L35GB uniquely delivers industrial-temp-rated, 5 V-compatible dual-port operation with integrated hardware arbitration and battery-retentive capability - making it irreplaceable in legacy or safety-critical systems requiring deterministic contention resolution without voltage conversion or firmware overhead.

Availability

IDT7025L35GB is available at Aetrix Electronics and suitable for industrial motion control, avionics display systems, and medical imaging subsystems requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial temperature performance.

Supply support for IDT7025L35GB 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 IDT7025L35GB belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems demanding hardware-enforced synchronization and industrial reliability.

FAQ

What is the guaranteed maximum read cycle time for the IDT7025L35GB?

The IDT7025L35GB guarantees a maximum read cycle time (tRC) of 35 ns across its specified industrial temperature range (–40°C to +85°C) and supply voltage (5.0 V ±10%). This parameter is production-tested and defines the minimum interval required between successive read operations on the same port to ensure valid data output.

Does the IDT7025L35GB support battery backup operation, and what voltage is required?

Yes, the IDT7025L35GB supports battery backup operation with guaranteed data retention at VCC = 2.0 V (VDR), as specified in Table 10 of the datasheet. In this mode, typical data retention current is 100 µA, enabling extended hold time during main power loss - a key feature distinguishing the "L" (low-power) variant from the "S" series.

How does the M/S pin affect BUSY signal behavior on the IDT7025L35GB?

When M/S = H, the IDT7025L35GB operates as a Master: BUSYL and BUSYR become output signals that assert during port contention. When M/S = L, it operates as a Slave: BUSYL and BUSYR become inputs used to stall local writes until the Master releases contention - enabling hierarchical arbitration in multi-device configurations.

Can the IDT7025L35GB be used in a 32-bit memory system, and how is that implemented?

Yes, the IDT7025L35GB supports 32-bit expansion via Master/Slave cascading. Two devices are configured with M/S = H (Master) and M/S = L (Slave); the Master's BUSY output connects to the Slave's BUSY input, and address/data buses are aligned. This configuration maintains full-speed operation without external logic, as stated in the device description on page 1.

What is the purpose of the semaphore function in the IDT7025L35GB, and how is it accessed?

The IDT7025L35GB integrates eight hardware semaphore flags for inter-port synchronization. They are accessed by setting SEM = L (low), then using A0–A2 to select one of eight flags, with I/O0 writing the flag and I/O0–I/O15 reading its state - all managed entirely in hardware without CPU intervention or additional components.