Renesas 70V25S25PF

Overview

70V25S25PF from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 25 ns maximum access time (commercial grade), 3.3 V single-supply operation, and on-chip semaphore arbitration logic. It enables simultaneous read/write access to shared memory in real-time embedded systems such as network packet buffers and digital signal processor co-processing interfaces.

For engineers reviewing the 70V25S25PF datasheet, 70V25S25PF pinout, 70V25S25PF application, or 70V25S25PF equivalent, key selection criteria include dual-port timing compatibility, 100-pin TQFP footprint, industrial temperature support (-40°C to +85°C), and integrated BUSY/INT flag signaling for inter-processor coordination.

Technical Context

The 70V25S25PF implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent access without external arbitration logic. Its on-chip hardware semaphore logic supports eight shared flags addressed via A0–A2, with dedicated SEM, INT, and BUSY signals for deterministic inter-port synchronization.

It uses CMOS high-performance fabrication for low-power operation: 400 mW typical active power and 3.3 mW typical standby power at 3.3 V. The device supports MASTER/SLAVE cascading for 32-bit+ bus expansion using M/S pin configuration and includes upper/lower byte enable (UB/LB) for multiplexed bus compatibility.

Key Specifications

Pinout & Package

70V25S25PF is housed in a 100-pin Thin Quad Flatpack (TQFP) package, designated PNG100, with 0.5 mm pitch and exposed thermal pad. All VDD pins must be connected to 3.3 V; 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 CY7C024AV-25AXC and AS7C34096B-25JCIN, the 70V25S25PF delivers unique value through on-chip semaphore logic and configurable BUSY signaling - reducing BOM count by up to three discrete components and eliminating firmware arbitration overhead in tightly coupled multi-processor systems.

Availability

70V25S25PF is available at Aetrix Electronics and suitable for network packet buffering, DSP co-processor interfaces, and industrial PLC I/O mapping requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature qualification.

Supply support for 70V25S25PF 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs before its acquisition by Renesas in 2019. IDT delivered high-performance, low-power solutions for communications, computing, and industrial markets.

The 70V25S25PF belongs to IDT's 70V25/24 family of high-speed dual-port SRAMs, designed specifically for real-time embedded systems requiring deterministic inter-processor communication, hardware-accelerated synchronization, and industrial-grade reliability.

FAQ

What is the maximum operating temperature range for the 70V25S25PF?

The 70V25S25PF is qualified for industrial temperature operation from -40°C to +85°C. This rating is confirmed in the Absolute Maximum Ratings table and supported by DC/AC electrical specifications across that full range. The device maintains 25 ns access time performance throughout this interval, making it suitable for harsh-environment applications like factory automation and outdoor telecom equipment.

Does the 70V25S25PF support MASTER/SLAVE configuration for wider data bus expansion?

Yes, the 70V25S25PF supports MASTER/SLAVE cascading using the M/S pin. When M/S = VIH, BUSY is driven as an output (Master mode); when M/S = VIL, BUSY is accepted as an input (Slave mode). This enables expansion beyond 16-bit data width - for example, two 70V25S25PF devices can form a 32-bit dual-port memory without external arbitration logic or glue components.

How many semaphore flags does the 70V25S25PF provide, and how are they accessed?

The 70V25S25PF provides eight hardware semaphore flags, addressed using A0–A2. Access occurs in semaphore mode when SEM = VIL and CE = VIH (or UB & LB = VIH). Data is written via I/O0 and read across all I/O pins (I/O0–I/O15). Each flag supports atomic test-and-set behavior, enabling lock-free synchronization between left and right ports without CPU involvement.

What is the function of the UBL/LBL and UBR/LBR pins on the 70V25S25PF?

The UBL/LBL (Upper/Lower Byte Select Left) and UBR/LBR (Upper/Lower Byte Select Right) pins enable independent 8-bit access to the 16-bit data bus. When UBL = VIL and LBL = VIH, only lower-byte I/O0L–I/O7L are active; when UBL = VIH and LBL = VIL, only upper-byte I/O8L–I/O15L respond. This supports 8-bit microcontroller interfacing, multiplexed bus architectures, and partial-word writes without read-modify-write cycles.

Is the 70V25S25PF pin-compatible with other members of the IDT70V25/24 family?

Yes, the 70V25S25PF shares the same 100-pin TQFP (PNG100) package and pinout with all IDT70V25/24 variants, including 70V25S15PF and 70V25L25PF. Differences are limited to speed grade (15/25/35/55 ns) and power variant (S = standard, L = low-power), allowing drop-in replacement within the same speed bin. A12 is No Connect for all 70V25 variants, confirming consistent pin mapping.