Renesas 70V24L25PFI

Overview

70V24L25PFI from IDT (Integrated Device Technology) is a high-speed, low-power 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 25 ns access time (industrial grade), 3.3 V single-supply operation, and integrated semaphore arbitration logic - used in real-time inter-processor communication, FPGA co-processing buffers, and legacy bus bridging applications.

For engineers reviewing the 70V24L25PFI datasheet, 70V24L25PFI pinout, 70V24L25PFI application, or 70V24L25PFI equivalent, key selection criteria include industrial temperature support (−40°C to +85°C), 84-pin PLCC package compatibility, BUSY/INT flag signaling, byte-selectable I/O control, and full on-chip hardware semaphore support for deterministic multiport resource sharing.

Technical Context

The 70V24L25PFI implements fully asynchronous dual-port architecture with separate address, control, and data buses per port, enabling simultaneous read/write operations to the same memory location without contention. It uses CMOS high-performance fabrication and supports MASTER/SLAVE cascading via M/S pin to expand data width beyond 16 bits.

Its on-chip arbitration logic handles port conflict resolution automatically, while dedicated SEM, BUSY, and INT signals provide hardware-level synchronization. The device operates exclusively at 3.3 V ±0.3 V and features TTL-compatible inputs with programmable standby modes controlled by CE pins per port.

Key Specifications

Pinout & Package

70V24L25PFI is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC, package code PLG84), body size ≈ 1.15 in × 1.15 in × 0.17 in, with gull-wing leads suitable for wave soldering and rework. All VDD pins require local decoupling; all VSS pins must be grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 70V24L15PFI, the 70V24L25PFI trades 10 ns of access speed for lower dynamic power and broader industrial temperature margin stability; versus 70V25L25PFI, it retains pin compatibility and footprint but sacrifices 2-bit data width and parity support.

Availability

70V24L25PFI is available at Aetrix Electronics and suitable for industrial PLCs, FPGA co-processing interfaces, legacy bus bridges, and DSP co-processor buffers requiring stable component supply across extended product lifecycles.

Supply support for 70V24L25PFI 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 interconnect solutions for communications, computing, and industrial markets.

The IDT70V24 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, industrial temperature resilience, and seamless integration with legacy and FPGA-based architectures.

FAQ

What is the maximum operating temperature range for the 70V24L25PFI?

The 70V24L25PFI is rated for industrial temperature operation from −40°C to +85°C. This specification is validated across all electrical parameters including access time, standby current, and I/O voltage thresholds, making it suitable for deployment in motor control cabinets, outdoor telecom equipment, and factory automation systems where ambient thermal stress is significant.

Does the 70V24L25PFI support true simultaneous read/write operations to the same memory address?

Yes, the 70V24L25PFI implements true dual-port SRAM cells that permit concurrent read and write operations to the identical memory location without data corruption or arbitration delay. This capability is fundamental to its use in real-time inter-processor communication, where one port writes status while the other reads it - all within the guaranteed 25 ns access window.

How does the semaphore functionality work on the 70V24L25PFI?

The 70V24L25PFI integrates eight hardware semaphore flags accessed via A0–A2 address lines and controlled by SEML/SEMR. When SEM is asserted, I/O0 writes to or reads from the selected flag; BUSY and INT signals coordinate contention resolution. This eliminates software-based locking and ensures atomic resource allocation between ports - critical for deterministic firmware in safety-critical applications.

Is the 70V24L25PFI pin-compatible with other members of the IDT70V24 family?

Yes, all IDT70V24 variants - including 70V24L15PFI, 70V24L25PFI, and 70V24L35PFI - share identical 84-pin PLCC pinouts and signal assignments. Speed grade differences (15/25/35 ns) and power suffixes (L = low-power) do not affect mechanical or electrical compatibility, enabling drop-in timing upgrades or power optimizations without PCB changes.

What is the role of the M/S pin on the 70V24L25PFI?

The M/S (Master/Slave) pin configures the 70V24L25PFI for cascaded operation: when driven high (VIH), it operates as a Master with BUSYR/BUSYL functioning as open-drain outputs; when driven low (VIL), it becomes a Slave with BUSY signals acting as inputs. This enables deterministic priority resolution in multi-device 32-bit+ memory expansions without external logic.