Renesas 70V27S25PFI8

Overview

70V27S25PFI8 from Integrated Device Technology is a high-speed 3.3V 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address, 25ns max read cycle time (tRC), industrial temperature range (–40°C to +85°C), and LVTTL-compatible I/O. It serves as a stand-alone 512K-bit memory or master/slave pair in 32-bit bus expansion systems.

For engineers reviewing the 70V27S25PFI8 datasheet, 70V27S25PFI8 pinout, 70V27S25PFI8 application, or 70V27S25PFI8 equivalent, key selection criteria include BUSY/INT flag timing, semaphore arbitration latency, byte-selectable write control, and dual-chip-enable depth expansion capability in real-time embedded inter-processor communication designs.

Technical Context

The 70V27S25PFI8 implements fully asynchronous dual-port architecture with independent left/right address, control, and 16-bit bidirectional I/O buses. Its on-chip arbitration logic resolves port contention via address-match or chip-enable-triggered BUSY assertion, with programmable master/slave mode controlled by the M/S pin.

It supports semaphore signaling across ports using dedicated SEM pins and A0–A2-addressed flags, enabling hardware-level mutual exclusion in multi-CPU systems. Power management includes four standby current modes (ISB1–ISB4) activated by TTL- or CMOS-level CE inputs, with typical active power of 500mW and standby as low as 3.3mW.

Key Specifications

Pinout & Package

70V27S25PFI8 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 and VSS pins must be individually decoupled per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-25AXC and R1EX24032ASAS-25, the 70V27S25PFI8 uniquely integrates BUSY-based hardware arbitration, M/S-configurable cascading, and eight hardware semaphores - making it irreplaceable in deterministic, low-latency inter-processor communication where software arbitration introduces unacceptable jitter or overhead.

Availability

70V27S25PFI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial PLC I/O data exchange, and avionics system health monitoring requiring stable component supply, long-lifecycle support, and guaranteed industrial-temperature performance.

Supply support for 70V27S25PFI8 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 communications and computing infrastructure.

The IDT70V27 family was designed specifically for high-reliability, low-latency shared-memory architectures in multi-processor embedded systems - emphasizing hardware arbitration, deterministic timing, and industrial environmental resilience.

FAQ

What is the maximum operating frequency supported by the 70V27S25PFI8?

The 70V27S25PFI8 supports a maximum read cycle rate of 40 MHz, derived from its 25 ns read cycle time (tRC). This is the sustained throughput limit for consecutive reads; write cycles follow the same 25 ns tWC specification. The device does not require clocks - all operations are fully asynchronous and timing-controlled by address and control signal transitions.

How does the BUSY arbitration mechanism work in the 70V27S25PFI8?

In the 70V27S25PFI8, BUSY arbitration activates when both ports attempt access to the same memory location. With M/S = VIH (Master), BUSYL/BUSYR become outputs asserting within tBAA ≤ 25 ns of address match. When M/S = VIL (Slave), BUSY pins serve as inputs that internally inhibit writes if driven low by a master device - enabling daisy-chained priority resolution without external logic.

Can the 70V27S25PFI8 operate with a 5V supply?

No. The 70V27S25PFI8 is strictly a 3.3 V ± 0.3 V device. Its absolute maximum terminal voltage is +4.6 V, and DC operating conditions specify VDD between 3.0 V and 3.6 V. Applying 5 V will exceed absolute maximum ratings and may cause permanent damage. Level-shifting circuitry is required for interfacing with 5V systems.

What is the function of the M/S pin on the 70V27S25PFI8?

The M/S pin on the 70V27S25PFI8 configures the device's BUSY pin behavior: at VIH, BUSYL and BUSYR act as push-pull outputs for master-mode arbitration; at VIL, they become inputs for slave-mode operation, allowing cascaded BUSY chaining. This pin enables flexible topology design - single-device systems use master mode, while multi-device shared-memory systems use master/slave combinations.

Does the 70V27S25PFI8 support byte-wide writes?

Yes. The 70V27S25PFI8 supports independent upper-byte (I/O8–I/O15) and lower-byte (I/O0–I/O7) writes using UBL/UBR and LBL/LBR control signals. This allows 8-bit data transfers on a 16-bit bus, essential for compatibility with 8-bit peripherals or partial register updates without disturbing adjacent data - confirmed in Truth Table II and functional description.