Renesas 7025L35PFI

Overview

7025L35PFI from IDT (Integrated Device Technology) is a high-speed 8K × 16 true dual-port static RAM with independent asynchronous left/right ports, 35 ns maximum read cycle time, 2V data retention for battery backup operation, and industrial temperature range (–40°C to +85°C). It enables simultaneous read access to the same memory location and supports MASTER/SLAVE cascading for 32-bit+ bus expansion in real-time inter-processor communication systems.

For engineers reviewing the 7025L35PFI datasheet, 7025L35PFI pinout, 7025L35PFI application, or 7025L35PFI equivalent, key selection considerations include its dual-port arbitration logic, on-chip semaphore signaling, BUSY flag timing (tBAA ≤ 20 ns), low standby current (ISB3 = 0.2 mA typ.), and compatibility with TTL-level 5V ±10% supply.

Technical Context

The 7025L35PFI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent read/write operations without external arbitration. Its on-chip hardware supports eight semaphore flags accessed via A0–A2 and controlled by SEM, UB/LB, and CE signals.

Port arbitration uses BUSY flag generation (M/S = H for MASTER output; M/S = L for SLAVE input) with priority resolution based on address match or chip enable assertion timing. The device supports both R/W-controlled and CE/UB/LB-controlled write cycles, with tBDD ≤ 35 ns ensuring valid data after BUSY deassertion in contention scenarios.

Key Specifications

Pinout & Package

7025L35PFI is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package, pin-compatible with IDT7025S/L family variants in PLCC, PGA, Flatpack, and TQFP options. The PFI suffix explicitly denotes PLCC packaging per IDT ordering conventions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AXC and IDT70V25L35PF, the 7025L35PFI uniquely delivers 2V data retention in a 5V-tolerant, industrial-grade PLCC package-making it irreplaceable in battery-backed avionics and industrial redundancy applications where voltage domain and package form factor are fixed constraints.

Availability

7025L35PFI is available at Aetrix Electronics and suitable for real-time inter-processor communication, avionics flight control systems, and industrial PLC redundancy modules requiring stable component supply across extended product lifecycles.

Supply support for 7025L35PFI 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 high-performance memory, timing, and interface solutions, now part of Renesas Electronics since 2019.

The IDT7025 family was designed specifically for deterministic, low-latency inter-processor communication in mission-critical embedded systems where hardware-enforced memory coherency and battery-backed state preservation are mandatory.

FAQ

What is the guaranteed data retention voltage for 7025L35PFI?

The 7025L35PFI guarantees data retention down to 2.0 V DC applied to VCC, as specified in Table 10 of the datasheet. This enables reliable operation during brownout conditions or when backed by a 2V lithium battery, with typical retention current of 100 µA and maximum of 4000 µA across the industrial temperature range.

Does 7025L35PFI support true simultaneous read access to the same memory address?

Yes, the 7025L35PFI implements true dual-port memory cells that allow concurrent reads from both left and right ports to the identical address location without contention or arbitration delay. This behavior is inherent to the silicon architecture and does not require BUSY flag polling or external logic.

How is the MASTER/SLAVE configuration implemented on 7025L35PFI?

The M/S pin on 7025L35PFI sets the device role: logic HIGH configures it as MASTER (BUSY signal driven as output), while logic LOW configures it as SLAVE (BUSY signal accepted as input). This enables daisy-chained configurations where one MASTER arbitrates multiple SLAVE devices for wider data bus expansion.

What is the meaning of the 'PFI' suffix in 7025L35PFI?

The 'PFI' suffix in 7025L35PFI indicates an 84-pin Plastic Leaded Chip Carrier (PLCC) package with industrial temperature range (–40°C to +85°C) and lead-free (RoHS-compliant) finish. It distinguishes this variant from PGA (PG), Flatpack (FP), or TQFP (PNG) versions of the same speed grade.

Can 7025L35PFI be used in systems requiring functional safety certification?

Yes, the 7025L35PFI has been deployed in SIL-2 and SIL-3 certified industrial PLCs due to its deterministic arbitration logic, on-chip semaphore hardware, and guaranteed timing parameters (e.g., tBDD ≤ 35 ns, tAPS = 5 ns). Its industrial temperature rating and 2V retention further support fault-tolerant design requirements.