Renesas 70V27S25PF

Overview

70V27S25PF from Integrated Device Technology (IDT) is a high-speed 32K × 16 dual-port static RAM with true simultaneous access to the same memory location from independent left and right ports, 25 ns maximum read cycle time (tRC), LVTTL-compatible 3.3 V ±0.3 V single supply, and integrated on-chip port arbitration logic - used in real-time inter-processor communication systems requiring deterministic latency and contention-free data exchange.

For engineers reviewing the 70V27S25PF datasheet, 70V27S25PF pinout, 70V27S25PF application, or 70V27S25PF equivalent, key selection considerations include its master/slave cascading capability for 32-bit+ bus expansion, BUSY/INT flag signaling, full semaphore support across eight flags, and industrial temperature range (-40°C to +85°C) operation.

Technical Context

The 70V27S25PF implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent read/write operations without external arbitration logic. Its on-chip arbitration uses address-match and chip-enable timing to assert BUSY flags, with priority determined by tAPS (5 ns setup) and tBDD (≤35 ns disable-to-valid-data delay).

It supports two distinct memory access modes: standard RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH, SEM = VIL), with dedicated A0–A2 addressing for eight semaphore flags. The device features separate upper-byte (UB) and lower-byte (LB) enables for flexible bus matching and supports both R/W-controlled and CE/UB/LB-controlled write cycles.

Key Specifications

Pinout & Package

70V27S25PF 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 CY7C1370D-250BAXI and R1EX24016AS0C-25, the 70V27S25PF uniquely delivers hardware-enforced contention resolution, eight semaphore flags, and master/slave expansion - making it optimal for deterministic real-time inter-processor communication where software overhead or external logic is unacceptable.

Availability

70V27S25PF is available at Aetrix Electronics and suitable for industrial automation controllers, telecommunications line cards, and real-time embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V27S25PF 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 power management ICs for communications, computing, and industrial markets.

The IDT70V27 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, semaphore support, and seamless bus expansion without external logic.

FAQ

What is the maximum operating speed of the 70V27S25PF?

The 70V27S25PF guarantees a 25 ns maximum read cycle time (tRC) and 25 ns maximum address access time (tAA) under commercial and industrial temperature conditions with 3.3 V ±0.3 V supply. This corresponds to a maximum effective throughput of approximately 40 million operations per second per port, assuming optimal bus control timing.

Does the 70V27S25PF support true simultaneous access to the same memory address?

Yes, the 70V27S25PF implements true dual-ported memory cells that allow concurrent read and write operations to the exact same memory location. When contention occurs, on-chip arbitration asserts BUSY flags to stall the later-accessing port, ensuring data integrity without external logic - a core feature confirmed in the functional block diagram and Truth Table V.

How does the Master/Slave configuration work on the 70V27S25PF?

The M/S pin configures the 70V27S25PF as either Master (M/S = VIH) or Slave (M/S = VIL). In Master mode, BUSYL/BUSYR are outputs used to signal busy state to downstream Slaves; in Slave mode, they become inputs that inhibit writes when asserted. This enables depth expansion of 32-bit+ memory systems using multiple 70V27S25PF devices without external logic.

What is the purpose of the semaphore function in the 70V27S25PF?

Each 70V27S25PF integrates eight hardware semaphore flags accessible via A0–A2 addressing and controlled by SEM pins. These flags enable atomic resource locking between processors - for example, one CPU can claim a shared peripheral by writing to a semaphore, and the other waits until the flag is cleared. This eliminates race conditions and replaces software-based mutexes with deterministic hardware signaling.

Is the 70V27S25PF compatible with 5 V logic systems?

No, the 70V27S25PF is strictly a 3.3 V LVTTL-compatible device with absolute maximum input voltage of VDD + 0.3 V (≤3.6 V). It is not 5 V tolerant. Direct connection to 5 V logic will damage the device. Level translation (e.g., TXB0108 or discrete resistor dividers) is required for interfacing with 5 V microcontrollers or FPGAs.