Renesas 70V25L55PF8

Overview

IDT70V25L55PF8 from Integrated Device Technology is a high-speed 4K x 16 true dual-port static RAM with independent left/right ports, 55 ns read/write cycle time, 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 IDT70V25L55PF8 datasheet, IDT70V25L55PF8 pinout, IDT70V25L55PF8 application, or IDT70V25L55PF8 equivalent, this device supports simultaneous asynchronous access to shared memory, full hardware semaphore signaling, and master/slave cascading for 32-bit+ bus expansion without external logic.

Technical Context

The IDT70V25L55PF8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent reads/writes to any memory location - including simultaneous reads of the same address. It uses CMOS high-performance technology and features automatic power-down via chip enable (CE) per port.

Its arbitration logic resolves port contention using BUSY flag signaling and supports semaphore operations via dedicated SEM pins and A0–A2 addressing, with guaranteed 5 ns semaphore write-to-read delay (tSWRD) and 5 ns contention window (tSPS), ensuring deterministic interlock behavior in multi-CPU systems.

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.

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-55PCN, the IDT70V25L55PF8 delivers lower standby power, integrated master/slave expansion capability, and faster semaphore response - making it optimal for tightly coupled multi-processor systems where deterministic arbitration and minimal external components are critical.

Availability

IDT70V25L55PF8 is available at Aetrix Electronics and suitable for industrial automation, real-time signal processing, network protocol offload, and redundant control system applications requiring stable component supply and long-term obsolescence management.

Supply support for IDT70V25L55PF8 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 high-performance computing solutions.

The IDT70V25 family was engineered for deterministic, low-latency inter-processor communication in embedded control systems - emphasizing hardware arbitration, byte-select flexibility, and ultra-low standby power.

FAQ

What is the maximum operating frequency supported by the IDT70V25L55PF8?

The IDT70V25L55PF8 has a 55 ns read cycle time (tRC), supporting a maximum sustained read frequency of 18.2 MHz. Its access time (tAA) is also rated at 55 ns, meaning it guarantees valid data within 55 ns after address stabilization. This specification applies across the commercial temperature range (0°C to +70°C) with VDD = 3.3 V ± 0.3 V. The IDT70V25L55PF8 does not specify a clock input; it operates asynchronously.

Does the IDT70V25L55PF8 support true simultaneous read operations from both ports?

Yes, the IDT70V25L55PF8 implements true dual-port SRAM architecture with independent address, data, and control lines per port. It allows simultaneous reads from both left and right ports - including concurrent reads of the exact same memory location - without contention or arbitration delay. This capability is enabled by physically separate memory cell arrays per port and is confirmed in the functional block diagram and truth table I of the official datasheet for IDT70V25L55PF8.

How does the semaphore functionality work on the IDT70V25L55PF8?

The IDT70V25L55PF8 integrates eight hardware semaphore flags accessible via A0–A2 address lines and controlled by SEML/SEMR pins. When SEM = VIL and CE = VIH (or UB & LB = VIH), the device enters semaphore mode: writing to I/O0 updates the selected flag, and reading returns its value across all I/O lines. Timing parameters tSWRD (≤5 ns) and tSPS (≤5 ns) ensure deterministic, low-latency inter-processor synchronization without software polling - a core feature of the IDT70V25L55PF8 design.

Can the IDT70V25L55PF8 be used in a master/slave configuration for wider data bus expansion?

Yes, the IDT70V25L55PF8 supports master/slave cascading via the M/S pin. When M/S = VIH, BUSY is an output indicating port contention; when M/S = VIL, BUSY is an input accepting arbitration signals from a master device. This allows multiple IDT70V25L55PF8 units to be combined into a 32-bit or wider memory system without external logic - a documented capability explicitly stated in the Features section of the IDT70V25L55PF8 datasheet.

What is the standby power consumption of the IDT70V25L55PF8?

The IDT70V25L55PF8 offers two standby modes: ISB1 (both ports disabled with TTL-level inputs) is 13 mA max, while ISB3 (full standby with CMOS-level inputs) is just 0.2 µA typical - reflecting its "L" (low-power) suffix designation. This ultra-low ISB3 current enables use in battery-backed or energy-sensitive applications where memory retention must persist with negligible drain. These values are specified at VDD = 3.3 V and TA = +25°C per the IDT70V25L55PF8 DC Electrical Characteristics table.