Renesas 7027S25PF8

Overview

7027S25PF8 from IDT 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 temperature range), TTL-compatible 5 V ±10% supply, and on-chip semaphore and arbitration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7027S25PF8 datasheet, 7027S25PF8 pinout, 7027S25PF8 application, or 7027S25PF8 equivalent, key selection considerations include bus-matching byte controls (UBL/LBL), master/slave cascading capability via M/S pin, BUSY/INT flag timing, and industrial-grade reliability across –40°C to +85°C.

Technical Context

The 7027S25PF8 implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves port contention using address-match or chip-enable timing, asserting BUSY flags to inhibit conflicting writes without external logic.

It supports semaphore signaling across eight shared flags addressed by A0–A2, with read/write control via SEM and CE polarity inversion (CE = VIH & SEM = VIL for semaphore access). The device uses CMOS high-performance fabrication and features automatic power-down per port via CE0/CE1 control.

Key Specifications

Pinout & Package

7027S25PF8 is packaged in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be connected per datasheet note; package includes dedicated left/right I/O banks, dual chip enables, and M/S configuration pin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-25AXC and IDT70V27L25PF, the 7027S25PF8 uniquely delivers native 5 V TTL compatibility, integrated M/S cascading, and hardware semaphore support - making it the only drop-in solution for legacy industrial and avionics dual-processor systems requiring zero external arbitration logic.

Availability

7027S25PF8 is available at Aetrix Electronics and suitable for industrial PLCs, aerospace avionics, telecom line cards, and real-time inter-processor communication systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7027S25PF8 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance silicon solutions for communications, computing, and industrial markets.

The 7027S25PF8 belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in safety-critical and real-time embedded systems where hardware arbitration and mailbox semantics are essential.

FAQ

What is the maximum operating temperature range for the 7027S25PF8?

The 7027S25PF8 is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all electrical parameters including 25 ns access time, BUSY arbitration timing, and standby current, making it suitable for deployment in harsh-environment control systems without derating.

Does the 7027S25PF8 support true simultaneous read/write to the same memory location?

Yes, the 7027S25PF8 uses true dual-ported memory cells that allow independent, asynchronous read and write operations to the exact same address location from left and right ports - provided BUSY arbitration is respected. This eliminates data corruption without requiring external logic or software coordination.

How does the M/S pin configure master versus slave behavior in the 7027S25PF8?

When M/S = VIH, the 7027S25PF8 operates as a Master: BUSYL and BUSYR become push-pull outputs that signal contention to other devices. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that accept BUSY signals from a Master, inhibiting local writes during contention.

Can the 7027S25PF8 be used in a 32-bit data path system?

Yes, the 7027S25PF8 supports 32-bit expansion via its Master/Slave cascading architecture. Two devices can be configured - one as Master (M/S = VIH), one as Slave (M/S = VIL) - with BUSY chaining to maintain full-speed, error-free operation without discrete glue logic or timing penalties.

What is the function of the SEM pin in the 7027S25PF8?

The SEM (Semaphore Enable) pin controls access to the eight hardware semaphore flags. When CE = VIH and SEM = VIL, the device enters semaphore mode - allowing read/write of semaphore tokens via I/O0 and A0–A2. This enables lock-free resource sharing between processors without consuming main memory space.