Renesas 70V25L35PFI8

Overview

IDT70V25L35PFI8 from Integrated Device Technology is a high-speed 3.3V 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 35ns read cycle time, 35ns write cycle time, and industrial temperature range (–40°C to +85°C). It supports full on-chip semaphore signaling and BUSY/INT flag arbitration for real-time inter-processor communication in embedded control systems.

For engineers reviewing the IDT70V25L35PFI8 datasheet, IDT70V25L35PFI8 pinout, IDT70V25L35PFI8 application, or IDT70V25L35PFI8 equivalent, key selection criteria include dual-port timing compatibility, 100-pin TQFP package footprint, LVTTL-compatible 3.3V operation, low-power standby current (660μW typ.), and integrated hardware semaphore support for lock-free resource sharing.

Technical Context

The IDT70V25L35PFI8 implements fully asynchronous dual-port architecture with separate address, data, and control buses per port-enabling simultaneous read/write access to the same memory location without contention. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion and supports master/slave cascading for 32-bit+ bus expansion.

It features dedicated semaphore registers (8 flags, addressed by A0–A2), accessed via SEM pin control, with guaranteed 5ns semaphore write-to-read delay (tSWRD) and 5ns contention window (tSPS). All I/Os are LVTTL-compatible, and power management includes CE-controlled automatic power-down into sub-milliwatt standby mode.

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V25L35PFI8, CY7C024AV-35JC delivers superior power efficiency in always-on subsystems, while R1EX24016DGS-35 provides broader temperature coverage and automotive-grade reliability-making each suitable for distinct mission-critical domains where IDT70V25L35PFI8 meets industrial but not automotive or ultra-low-power requirements.

Availability

IDT70V25L35PFI8 is available at Aetrix Electronics and suitable for industrial PLCs, dual-core DSP systems, motor drive controllers, and avionics sensor fusion modules requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.

Supply support for IDT70V25L35PFI8 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 solutions for communications, computing, and industrial markets.

IDT70V25L35PFI8 belongs to the IDT70V25/24 family of high-speed 3.3V dual-port SRAMs, designed specifically for real-time embedded systems requiring deterministic inter-processor communication, hardware-based resource locking, and industrial-grade reliability.

FAQ

What is the maximum operating frequency supported by the IDT70V25L35PFI8?

The IDT70V25L35PFI8 does not operate at a fixed clock frequency but supports asynchronous operation with a 35 ns read cycle time (tRC) and 35 ns write cycle time (tWC). This corresponds to a maximum effective throughput of approximately 28.6 MHz for sequential accesses. System-level timing depends on external controller setup/hold margins and bus loading, not an internal clock.

Does the IDT70V25L35PFI8 support true simultaneous read/write to the same memory address?

Yes, the IDT70V25L35PFI8 uses true dual-port SRAM cells that allow independent, concurrent read and write operations to the same address location-one port reading while the other writes-without data corruption or arbitration delay. This is confirmed in the Functional Block Diagram and "True Dual-Ported memory cells" feature statement.

How is semaphore functionality implemented in the IDT70V25L35PFI8?

The IDT70V25L35PFI8 integrates eight hardware semaphore flags accessible via A0–A2 address lines and controlled by the SEM pin. When SEM = VIL and CE = VIH (or UB & LB = VIH), the device enters semaphore mode; I/O0 writes the flag value, and all I/O pins (I/O0–I/O15) reflect the flag state on read. Timing parameters tSWRD (5 ns) and tSPS (5 ns) govern atomicity.

What is the significance of the 'L' and '35' in the IDT70V25L35PFI8 part number?

In IDT70V25L35PFI8, 'L' denotes the low-power version (vs. 'S' standard power), with standby current reduced to 660 μW typ. The '35' specifies the speed grade: 35 ns maximum read/write cycle time. 'PFI8' indicates 100-pin TQFP package, industrial temperature range (–40°C to +85°C), and lead-free/RoHS compliance.

Can the IDT70V25L35PFI8 be used in master/slave configurations for wider data buses?

Yes, the IDT70V25L35PFI8 supports master/slave cascading via the M/S pin: when M/S = VIH, BUSY is an output flag indicating port contention; when M/S = VIL, BUSY becomes an input for slave devices. This enables seamless expansion to 32-bit or wider data paths without external logic, as documented in the Features section and Pin Names table.