Renesas 70V27S25PFI

Overview

70V27S25PFI from Integrated Device Technology is a high-speed 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address, 25 ns maximum access time (industrial grade), 3.3 V ±0.3 V single-supply operation, and on-chip port arbitration logic - used in real-time interprocessor communication and shared-memory embedded systems.

For engineers reviewing the 70V27S25PFI datasheet, 70V27S25PFI pinout, 70V27S25PFI application, or 70V27S25PFI equivalent, key selection criteria include BUSY/INT flag timing, semaphore support for resource locking, master/slave cascading capability, and industrial temperature range (-40°C to +85°C) compliance.

Technical Context

The 70V27S25PFI implements fully asynchronous dual-port architecture with independent left/right control, address, and I/O buses. It supports both RAM array access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH, SEM = VIL), with dedicated BUSY and INT flags for port coordination.

Its arbitration logic resolves contention via address-match or chip-enable timing, with tAPS = 5 ns priority setup and tBDD ≤ 35 ns disable-to-valid-data delay. The device uses LVTTL-compatible inputs and push-pull outputs, and supports byte-selectable writes via UBL/LBL and UB/R/UBR/LBR controls.

Key Specifications

Pinout & Package

70V27S25PFI is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VDD pins require local decoupling; all VSS pins must be connected to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-25AXC, 70V27S25PFI offers native 3.3 V operation and hardware semaphores; compared with IDT70V35S25PF, it provides cost-optimized 512 Kbit density with identical industrial qualification and pin compatibility.

Availability

70V27S25PFI is available at Aetrix Electronics and suitable for industrial PLC communication modules, aerospace avionics data routers, and medical imaging signal processors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V27S25PFI 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, and RF power solutions for high-performance computing and communications.

The IDT70V27 product line was designed specifically for deterministic interprocessor communication in real-time embedded systems, emphasizing hardware arbitration, low-latency access, and industrial reliability.

FAQ

What is the operating temperature range of the 70V27S25PFI?

The 70V27S25PFI is rated for industrial temperature operation from -40°C to +85°C, verified across all speed grades and functional modes including RAM access, semaphore operations, and BUSY/INT flag assertion. This range is explicitly confirmed in the DC Electrical Characteristics table (Table 6) and applies to the PFI suffix variant.

Does the 70V27S25PFI support true simultaneous read/write to the same memory location?

Yes, the 70V27S25PFI features true dual-ported memory cells that allow independent, asynchronous read and write operations to the same address from left and right ports - a core architectural feature confirmed in the "Features" section and functional block diagram. No internal collision detection or arbitration delay is incurred for same-address access.

How does the M/S pin affect BUSY pin functionality on the 70V27S25PFI?

When M/S = VIH, the 70V27S25PFI operates as a Master: BUSYL and BUSYR are push-pull outputs asserting active-HIGH busy status during arbitration. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that inhibit writes when driven LOW - behavior defined in Note 1 of the Pin Configuration diagram and Truth Table V.

Can the 70V27S25PFI be used in a 32-bit data path configuration?

Yes, the 70V27S25PFI supports 32-bit expansion via Master/Slave cascading: two devices are connected with M/S = VIH (Master) and M/S = VIL (Slave), using BUSY handshake and shared address/control lines. This capability is explicitly documented in the "Features" list and functional description under "MASTER/SLAVE Dual-Port RAM approach".

What is the standby current consumption of the 70V27S25PFI in full CMOS standby mode?

In full CMOS standby (ISB3 mode), where both ports have all inputs at valid CMOS levels (VIN < 0.2 V or > VDD – 0.2 V) and CE pins held inactive, the 70V27S25PFI consumes 0.2 mA typical - specified in Table 10a for the S version at 25 ns speed grade. This ultra-low quiescent current enables energy-efficient idle states in always-on embedded systems.