Renesas 70V27S15PFI

Overview

70V27S15PFI from IDT (now part of Renesas) is a high-speed 32K × 16 dual-port static RAM with true independent left/right port access, 15 ns maximum read cycle time (commercial/industrial), 3.3 V ±0.3 V single-supply operation, and integrated hardware semaphore arbitration logic. It serves as a stand-alone 512 Kbit memory or master/slave pair in 32-bit+ bus systems for real-time inter-processor communication.

For engineers reviewing the 70V27S15PFI datasheet, 70V27S15PFI pinout, 70V27S15PFI application, or 70V27S15PFI equivalent, key selection criteria include simultaneous asynchronous port access, BUSY/INT flag timing (tBAA ≤15 ns), on-chip semaphore support (8 flags, A0–A2 addressed), LVTTL-compatible I/O, and industrial temperature range (−40°C to +85°C) compliance.

Technical Context

The 70V27S15PFI implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port-enabling concurrent read/write operations to identical or distinct memory locations without external arbitration logic. Its on-chip arbitration uses address-match or chip-enable timing to assert BUSY flags (push-pull, non-tri-state) and supports priority resolution via tAPS (5 ns setup).

It integrates dedicated semaphore registers accessible via SEM = VIL and CE = VIH, allowing atomic flag acquisition/release across ports using I/O0 for write and all I/Os (I/O0–I/O15) for read. The device supports depth expansion via dual CE enables and data-width expansion to 32 bits+ using M/S-selectable master/slave cascading with BUSY-driven handshaking.

Key Specifications

Pinout & Package

70V27S15PFI 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-133AXC and R1EX24016AS0C#U0, the 70V27S15PFI uniquely delivers deterministic hardware arbitration (BUSY/INT/SEM), industrial temperature rating, and master/slave expandability - making it irreplaceable for real-time embedded IPC where sub-20 ns contention resolution and zero-software-sync overhead are mandatory.

Availability

70V27S15PFI is available at Aetrix Electronics and suitable for industrial PLC communication modules, avionics data concentrators, and medical imaging frame buffers requiring stable component supply, long-term lifecycle support, and guaranteed industrial-grade qualification.

Supply support for 70V27S15PFI 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

IDT (Integrated Device Technology), now part of Renesas Electronics, is a fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V27S15PFI belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems where hardware-enforced memory coherency is critical.

FAQ

What is the maximum operating frequency supported by the 70V27S15PFI?

The 70V27S15PFI has a 15 ns maximum read cycle time (tRC), corresponding to a theoretical maximum operating frequency of 66.7 MHz for continuous random-access patterns. This assumes proper setup/hold timing compliance and valid address/control transitions per AC specifications. Real-world throughput depends on bus protocol efficiency and contention behavior.

Does the 70V27S15PFI support true simultaneous access to the same memory location from both ports?

Yes - the 70V27S15PFI features true dual-ported memory cells that allow concurrent read/write operations to identical addresses. When contention occurs, on-chip arbitration asserts BUSY flags to stall the later-arriving write, preserving data integrity without external logic or software intervention.

How does the semaphore functionality work in the 70V27S15PFI?

The 70V27S15PFI provides eight hardware semaphore flags accessed via A0–A2 address lines. To write a flag, set SEM = VIL and CE = VIH, then drive I/O0; to read, the same address returns the flag value on all 16 I/O lines. This enables atomic acquire/release operations essential for multi-processor resource locking.

Can the 70V27S15PFI operate in an industrial temperature environment?

Yes - the 70V27S15PFI is rated for −40°C to +85°C ambient operation and is explicitly qualified for industrial temperature range per its datasheet. This includes validated DC/AC electrical performance, leakage current limits, and reliability testing across the full range.

What is the purpose of the M/S pin on the 70V27S15PFI?

The M/S (Master/Slave) pin configures BUSY pin behavior: when M/S = VIH, BUSYL/BUSYR are outputs used for arbitration in master mode; when M/S = VIL, they become inputs for slave-mode handshaking. This enables daisy-chained configurations where one device controls arbitration for multiple 70V27S15PFI units.