Renesas 70V25L55PFI

Overview

70V25L55PFI from IDT (Integrated Device Technology) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 55 ns read/write cycle time, 3.3 V single-supply operation, and industrial temperature range (–40°C to +85°C). It integrates on-chip semaphore logic and BUSY/INT flags for inter-processor communication in real-time embedded systems.

For engineers reviewing the 70V25L55PFI datasheet, 70V25L55PFI pinout, 70V25L55PFI application, or 70V25L55PFI equivalent, this device supports simultaneous read/write access to shared memory in multi-CPU architectures, bus arbitration in FPGA co-processing, low-latency data buffering in telecom line cards, and deterministic inter-core signaling in safety-critical control systems.

Technical Context

The 70V25L55PFI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling concurrent access without internal arbitration delay. Its on-chip hardware semaphore logic uses A0–A2 addressing to manage eight shared resource flags across ports.

It supports Master/Slave cascading via M/S pin to expand data width beyond 16 bits, with BUSY flag output (Master) or input (Slave), and features LVTTL-compatible 3.3 V I/O with separate upper-byte (UBR/UBL) and lower-byte (LBR/LBL) enables for multiplexed bus compatibility.

Key Specifications

Pinout & Package

70V25L55PFI is housed in a 100-pin Thin Quad Flatpack (TQFP) with exposed pad, measuring 14 mm × 14 mm × 1.4 mm. Pin assignments follow the IDT70V25/24 family layout, with dedicated left-port (L) and right-port (R) signal groups, including dual chip enables (CEL/CER), dual read/write controls (R/WL/R/WR), and dual byte enables (UBL/UBR, LBL/LBR).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-55AXC and AS7C34098A-55PCN, the 70V25L55PFI uniquely delivers integrated semaphore logic, BUSY/INT flags, and Master/Slave configuration in a drop-in 100-pin TQFP-reducing BOM count and eliminating timing-critical external arbitration logic.

Availability

70V25L55PFI is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, avionics, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for 70V25L55PFI 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 IDT70V25/24 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems-prioritizing hardware arbitration, industrial temperature reliability, and seamless integration with microcontrollers and FPGAs.

FAQ

What is the maximum operating frequency supported by the 70V25L55PFI?

The 70V25L55PFI does not operate on a clock; it is an asynchronous SRAM. Its performance is defined by access time: tAA = 55 ns max, corresponding to a maximum effective read/write cycle rate of ~18.2 MHz under ideal conditions. Actual throughput depends on system-level timing margins, bus loading, and control signal setup/hold compliance.

Does the 70V25L55PFI support both commercial and industrial temperature ranges?

No-the 70V25L55PFI is specified exclusively for the industrial temperature range (–40°C to +85°C), as indicated by the "I" suffix in its ordering code. The "55" denotes 55 ns speed grade, and "L" indicates low-power variant. Commercial-grade variants (e.g., 70V25S55PFG) exist but are distinct orderable parts.

How is semaphore functionality implemented in the 70V25L55PFI?

The 70V25L55PFI implements eight hardware semaphore flags accessed via A0–A2 address lines. When SEM = VIL and CE = VIH (or UB & LB = VIH), writes to I/O0 update the selected flag; all I/O pins reflect the flag value on read. Contention is resolved via tSPS (5 ns minimum) window-ensuring deterministic ownership assignment between ports.

Can the 70V25L55PFI be used in a Master/Slave configuration with other IDT dual-port SRAMs?

Yes-the 70V25L55PFI supports Master/Slave cascading via the M/S pin. When M/S = VIH, BUSY is driven as an output (Master); when M/S = VIL, BUSY is accepted as an input (Slave). This enables expansion to 32-bit or wider data buses using multiple 70V25L55PFI or compatible IDT70V24/25 devices without external logic.

What are the power supply requirements for reliable operation of the 70V25L55PFI?

The 70V25L55PFI requires a single 3.3 V supply (VDD = 3.0 V to 3.6 V) with bypassing: at least one 0.1 µF ceramic capacitor per VDD pin, placed within 5 mm of the pin. All VSS pins must be solidly connected to ground plane. Input voltage levels must meet VIH ≥ 2.0 V and VIL ≤ 0.8 V to ensure LVTTL compatibility and noise immunity.