Renesas 70V25S35J

Overview

IDT70V25S35J from Integrated Device Technology is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 35 ns read cycle time (commercial grade), 3.3 V single-supply operation, and on-chip semaphore arbitration-designed for real-time inter-processor communication in industrial control systems.

For engineers reviewing the IDT70V25S35J datasheet, IDT70V25S35J pinout, IDT70V25S35J application, or IDT70V25S35J equivalent, this page delivers verified timing specs, validated TQFP-100 package mapping, confirmed dual-port arbitration behavior, and two manufacturer-validated alternative parts for memory bus expansion scenarios.

Technical Context

The IDT70V25S35J implements fully asynchronous dual-port access with separate address, control, and I/O buses per port, enabling simultaneous reads/writes to the same memory location without external logic. Its on-chip arbitration resolves port contention via BUSY flag signaling and supports MASTER/SLAVE cascading for 32-bit+ data width expansion.

It integrates full hardware semaphore logic across eight flags (addressed by A0–A2), with dedicated SEM pins and deterministic contention window (tSPS = 5 ns) and write-to-read latency (tSWRD = 5 ns). All I/Os are LVTTL-compatible with 3.3 V ±0.3 V supply and operate across commercial temperature range (0°C to +70°C).

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant plastic molding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133AXC and IS61LV25616AL-10TLI, the IDT70V25S35J uniquely delivers integrated arbitration and semaphore logic at 35 ns speed - making it optimal for cost-sensitive, real-time inter-processor communication where deterministic latency and minimal BOM count are critical.

Availability

IDT70V25S35J is available at Aetrix Electronics and suitable for industrial automation, medical imaging equipment, and automotive ADAS subsystems requiring stable component supply over extended production lifecycles.

Supply support for IDT70V25S35J 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning ICs.

The IDT70V25S35J belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems.

FAQ

What is the maximum supported clock frequency for IDT70V25S35J in read operations?

IDT70V25S35J does not use a clock; it is an asynchronous SRAM. Its read performance is defined by tRC = 35 ns maximum, corresponding to a theoretical maximum sustained read rate of ~28.6 MHz. Actual system throughput depends on address/control setup/hold timing and bus protocol overhead-not a fixed clock frequency.

Does IDT70V25S35J support simultaneous read and write to the same memory address?

Yes, IDT70V25S35J supports true simultaneous read and write to the same address via its dual-port architecture. The device guarantees data integrity through internal arbitration-no external logic is needed. However, writing to one port while reading the same location on the other yields the pre-write value, as writes are not atomic across ports.

Is IDT70V25S35J pin-compatible with IDT70V24S15J?

No, IDT70V25S35J is not pin-compatible with IDT70V24S15J. While both use 100-pin TQFP packages, their pinouts differ significantly: IDT70V24S15J has I/O0x–I/O15x mapped across pins 1–16 and 85–96, whereas IDT70V25S35J assigns I/O0L–I/O7L to pins 72–79 and I/O8L–I/O15L to pins 63–70. PCB layout changes are required for substitution.

How does the semaphore function work on IDT70V25S35J?

IDT70V25S35J provides eight hardware semaphore flags accessed via A0–A2 address lines. When SEM = VIL and CE = VIH (or UB & LB = VIH), I/O0 writes the flag state and all I/O pins (I/O0–I/O15) reflect the flag value on read. Contention is resolved deterministically within tSPS = 5 ns, ensuring atomic flag acquisition in multi-processor systems.

What is the meaning of the 'S' and '35' in IDT70V25S35J?

In IDT70V25S35J, 'S' denotes the standard power version (vs. 'L' for low-power), and '35' specifies the commercial-grade 35 ns maximum read cycle time. The 'J' suffix indicates commercial temperature range (0°C to +70°C) and lead-free, RoHS-compliant packaging in TQFP-100.