Renesas 7027S25PFI8

Overview

7027S25PFI8 from IDT (Integrated Device Technology) is a high-speed 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous read/write access to the same address, 25 ns maximum access time (industrial grade), TTL-compatible 5V ±10% supply, and on-chip semaphore and arbitration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7027S25PFI8 datasheet, 7027S25PFI8 pinout, 7027S25PFI8 application, or 7027S25PFI8 equivalent, key selection criteria include bus-matching byte controls (UBL/LBL), Master/Slave cascading capability via M/S pin, BUSY flag timing (tBDD ≤ 25 ns), industrial temperature range (–40°C to +85°C), and TQFP-100 packaging for space-constrained PCB layouts.

Technical Context

The 7027S25PFI8 implements fully asynchronous dual-port architecture with independent left/right address buses (A0L–A14L / A0R–A14R), separate chip enables (CE0L/CE1L and CE0R/CE1R), and dedicated I/O banks (I/O0L–I/O15L / I/O0R–I/O15R). Its on-chip arbitration logic resolves port contention using address-match or chip-enable timing, with BUSY asserted only during write-write collisions at identical addresses.

It supports semaphore signaling across ports via SEM pins and A0–A2 addressing of eight shared flags, and provides interrupt generation by writing to fixed mailbox addresses (7FFE_H for INTL, 7FFF_H for INTR), all operating without external logic under full 5V TTL compatibility.

Key Specifications

Pinout & Package

7027S25PFI8 is packaged in a 100-pin TQFP (Thin Quad Flatpack) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be connected per datasheet layout guidelines to ensure signal integrity and thermal stability.

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 7027S25PFI8 delivers native 5V TTL operation without translation, guaranteed 25 ns performance across industrial temperature, and integrated Master/Slave configuration-making it optimal for legacy 5V real-time systems requiring minimal BOM count and deterministic arbitration.

Availability

7027S25PFI8 is available at Aetrix Electronics and suitable for real-time industrial PLCs, avionics data concentrators, dual-core DSP communication links, and ruggedized radar signal processors requiring stable component supply across extended product lifecycles.

Supply support for 7027S25PFI8 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) was a fabless semiconductor company specializing in high-performance timing, memory, and interface solutions before its acquisition by Renesas Electronics in 2019.

The 7027S25PFI8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in hard real-time embedded systems where lock-free shared memory and sub-30 ns latency are mandatory.

FAQ

What is the maximum access time specification for the 7027S25PFI8?

The 7027S25PFI8 has a maximum access time of 25 ns across the full industrial temperature range (–40°C to +85°C), measured as tAA (address access time), tACE (chip enable access time), and tAOE (output enable access time). This value is production-tested and guaranteed-not characterized only-and applies to both left and right ports under VCC = 5.0 V ±10%.

Does the 7027S25PFI8 support true simultaneous read/write to the same memory address?

Yes, the 7027S25PFI8 implements true dual-ported memory cells that permit independent, asynchronous read and write operations to the exact same memory location from left and right ports. When contention occurs, on-chip arbitration asserts BUSY to stall the later-arriving write-ensuring data coherency without external logic or software intervention.

How does the Master/Slave (M/S) pin affect BUSY pin behavior on the 7027S25PFI8?

When M/S = VIH, the 7027S25PFI8 operates as a Master: BUSYL and BUSYR become push-pull outputs reflecting arbitration status. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that inhibit local writes when driven low by a Master-enabling hierarchical multi-device memory expansion without additional control circuitry.

What are the valid mailbox addresses for interrupt generation in the 7027S25PFI8?

The 7027S25PFI8 uses fixed addresses for interrupt flag control: writing to 7FFE_H (hex) with the right port asserts INTL (left port interrupt), and writing to 7FFF_H with the left port asserts INTR (right port interrupt). Clearing is performed by reading those same addresses-both locations remain fully usable as general SRAM when interrupts are disabled.

Can the 7027S25PFI8 be used in a 32-bit data path configuration?

Yes, the 7027S25PFI8 supports 32-bit expansion via its Master/Slave cascading architecture. Two devices can be connected with M/S = VIH (Master) and M/S = VIL (Slave), using BUSY chaining and shared address/control lines-enabling full-speed, error-free 32-bit word access without external logic, as confirmed in the functional description and truth tables of the official datasheet.