Renesas 7027L25PFI8

Overview

7027L25PFI8 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, 1 mW typical standby power, TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It serves as a master/slave-configurable memory buffer in real-time embedded systems requiring deterministic inter-processor communication.

For engineers reviewing the 7027L25PFI8 datasheet, 7027L25PFI8 pinout, 7027L25PFI8 application, or 7027L25PFI8 equivalent, key selection criteria include bus arbitration timing (tAPS = 5 ns), BUSY flag response (tBAA ≤ 20 ns), semaphore update pulse width (tSOP ≥ 12 ns), and dual-chip-enable depth expansion capability without external logic.

Technical Context

The 7027L25PFI8 implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves port contention via address-match or chip-enable-triggered BUSY assertion, with tBDD ≤ 25 ns port-to-port data delay for write-read synchronization.

It supports semaphore signaling across ports using dedicated SEM pins and A0–A2 addressing of eight shared flags, with tSWRD = 5 ns semaphore write-to-read latency and tSPS = 5 ns contention window-enabling deterministic mutual exclusion in multi-CPU architectures without software overhead.

Key Specifications

Pinout & Package

7027L25PFI8 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 require local decoupling per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-250BAXI and IS61WV102416BLL-10TLI, the 7027L25PFI8 uniquely delivers asynchronous dual-port operation with integrated BUSY arbitration and semaphore registers-enabling direct CPU-to-CPU communication without clocks, glue logic, or software overhead.

Availability

7027L25PFI8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics data concentrators, and medical imaging subsystems requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for 7027L25PFI8 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 timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019.

The IDT7027 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems-prioritizing hardware arbitration, semaphore support, and asynchronous operation over raw bandwidth.

FAQ

What is the maximum operating temperature range for the 7027L25PFI8?

The 7027L25PFI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "Recommended DC Operating Conditions" table (Table 6) and applies across all DC and AC electrical parameters unless otherwise noted for specific speed grades. The device uses CMOS process technology optimized for thermal stability in harsh environments.

Does the 7027L25PFI8 support true simultaneous access to the same memory location from both ports?

Yes, the 7027L25PFI8 features true dual-ported memory cells that allow simultaneous read/write access to identical addresses. When contention occurs, on-chip arbitration asserts BUSY to stall the later-arriving write, ensuring data integrity. This behavior is documented in the Functional Block Diagram and Truth Table V (Address Bus Arbitration).

How does the M/S pin affect BUSY functionality in the 7027L25PFI8?

When M/S = VIH, the 7027L25PFI8 operates as a master: BUSYL and BUSYR are push-pull outputs reflecting arbitration status. When M/S = VIL, it operates as a slave: BUSYL and BUSYR become inputs that inhibit writes when driven low by a master device. This is explicitly defined in Note 1 of the Pin Configurations section and Truth Table V.

What is the purpose of the SEM pins on the 7027L25PFI8?

The SEML and SEMR pins enable access to the internal eight-flag semaphore register. When CE = VIH and SEM = VIL (per Truth Table III), the device routes I/O0–I/O15 to semaphore control instead of memory array-allowing atomic flag setting/clearing without affecting main memory contents. This is used for lightweight inter-processor synchronization.

Can the 7027L25PFI8 be used in a 32-bit data path configuration?

Yes, the 7027L25PFI8 supports data bus expansion via Master/Slave cascading. By connecting M/S = VIH on one device (master) and M/S = VIL on another (slave), and wiring BUSY outputs to BUSY inputs, multiple units can be stacked to form wider memory interfaces (e.g., 32-bit) without external logic-per the "IDT MASTER/SLAVE Dual-Port RAM approach" described in the Description section.