Renesas 70V25L55J8

Overview

IDT70V25L55J8 from Integrated Device Technology is a high-speed 4K x 16 true dual-port static RAM with independent left/right ports, 55 ns read cycle time, 3.3 V single-supply operation, and integrated semaphore logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the IDT70V25L55J8 datasheet, IDT70V25L55J8 pinout, IDT70V25L55J8 application, or IDT70V25L55J8 equivalent, this device supports simultaneous asynchronous access to shared memory, hardware port arbitration, and byte-selectable I/O control - critical for FPGA-to-processor bridging, industrial motion controllers, and telecom packet buffering.

Technical Context

The IDT70V25L55J8 implements fully asynchronous dual-port architecture with separate address, control, and data buses per port, enabling concurrent read/write operations without external arbitration logic. It integrates on-chip semaphore flags (A0–A2 addressed) and BUSY/INT signaling for deterministic resource sharing between master/slave processors.

Its 3.3 V LVTTL-compatible interface operates across commercial temperature range (0°C to +70°C), with low-power standby current of 11 µA (typ.) and active power dissipation of 120 mW (typ.), optimized for systems requiring deterministic latency and minimal power overhead during idle periods.

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 green variant available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-55AXC and AS7C34098B-55JCIN, the IDT70V25L55J8 uniquely delivers integrated hardware semaphore and configurable BUSY arbitration in a drop-in 100-pin TQFP package - reducing BOM count and eliminating timing-critical software synchronization code.

Availability

IDT70V25L55J8 is available at Aetrix Electronics and suitable for industrial motion controllers, FPGA-to-MCU bridges, telecom packet buffers, and DSP co-processor interfaces requiring stable component supply and long-term production continuity.

Supply support for IDT70V25L55J8 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 solutions for communications, computing, and industrial markets.

The IDT70V25 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, semaphore support, and seamless 3.3 V integration.

FAQ

What is the maximum operating frequency supported by the IDT70V25L55J8?

The IDT70V25L55J8 has a 55 ns read cycle time (tRC), supporting maximum sustained operation at approximately 18.2 MHz when interfaced with synchronous logic. Its fully asynchronous design means actual throughput depends on system-level timing margins, not a fixed clock - making it suitable for variable-rate data exchange between mismatched processors or FPGAs without clock domain synchronization circuitry.

Does the IDT70V25L55J8 support true simultaneous read/write operations on both ports?

Yes, the IDT70V25L55J8 implements true dual-port SRAM cells that allow independent, fully asynchronous read or write access to any memory location from either port at the same time. No arbitration delay or external logic is required - the on-chip arbitration logic resolves contention automatically, and the BUSY flag signals conflict only when both ports attempt write access to the same address simultaneously.

How is semaphore functionality implemented in the IDT70V25L55J8?

The IDT70V25L55J8 includes eight dedicated hardware semaphore flags accessed via address lines A0–A2. When SEM is asserted low and CE/UB/LB are high, writes to I/O0 update the selected flag; all I/O pins reflect the flag value on read. This enables atomic set/clear operations without software intervention - critical for lock-free synchronization between independent processors sharing memory resources.

What is the role of the M/S pin on the IDT70V25L55J8?

The M/S (Master/Slave) pin configures BUSY behavior: when pulled high, BUSY acts as an output indicating local port contention; when pulled low, BUSY becomes an input accepting BUSY signals from a cascaded master device. This enables hierarchical multi-device configurations - for example, two IDT70V25L55J8 units can be stacked to form a 32-bit wide memory with coordinated arbitration, using one as master and the other as slave.

Is the IDT70V25L55J8 pin-compatible with other members of the IDT70V25/24 family?

Yes, the IDT70V25L55J8 shares identical 100-pin TQFP (PNG100) pinout with all IDT70V25/24 variants including IDT70V25S15J8 and IDT70V24L25JG. Pin functions, voltage levels, and timing interfaces are consistent across speed grades and power variants - allowing drop-in replacement for performance tuning or power optimization without PCB redesign.