Renesas 7025L25PF

Overview

7025L25PF from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with independent asynchronous left/right ports, 25 ns maximum read cycle time, 1 mW typical standby power, and TTL-compatible 5 V ±10% operation - used in real-time inter-processor communication, video frame buffers, and military-grade avionics data exchange.

For engineers reviewing the 7025L25PF datasheet, 7025L25PF pinout, 7025L25PF application, or 7025L25PF equivalent, this page delivers verified timing specs (tRC = 25 ns), dual-port arbitration behavior, BUSY/INT semaphore logic, battery backup retention at 2 V, and exact PLCC-84 pin mapping per official IDT DSC 2683/13 documentation.

Technical Context

The 7025L25PF implements fully asynchronous dual-port access with on-chip arbitration logic that resolves simultaneous reads/writes to identical addresses via hardware BUSY flag assertion. Its M/S pin configures master/slave cascading for 32-bit+ bus expansion without external glue logic.

It supports two distinct memory access modes: standard RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH or UB&LB = VIH, SEM = VIL), with dedicated INTL/INTR flags and eight addressable (A0–A2) semaphore bits shared across both ports.

Key Specifications

Pinout & Package

7025L25PF is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 0.050" lead pitch, JEDEC MS-026AC compliant footprint, and top-marking "7025L25PF".

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-25JC and IDT70V25L25PF, the 7025L25PF uniquely integrates master/slave arbitration and 2 V battery retention in a 5 V industrial PLCC package - making it optimal for legacy avionics and ruggedized control systems requiring guaranteed data persistence and scalable dual-port topology.

Availability

7025L25PF is available at Aetrix Electronics and suitable for avionics flight control systems, digital video frame buffers, and industrial PLC communication modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7025L25PF 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 timing, memory, and interface solutions, now part of Renesas Electronics since 2019.

The 7025L25PF belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic real-time systems demanding zero-latency inter-processor communication, hardware-enforced synchronization, and military-grade reliability.

FAQ

What is the maximum operating temperature range for the 7025L25PF?

The 7025L25PF is rated for industrial temperature operation from –40°C to +85°C, as confirmed in IDT DSC 2683/13 Section 6. This range is validated across all AC/DC specifications including tRC = 25 ns, standby current ISB1 ≤ 16 mA, and data retention at 2 V. It is not rated for commercial (0°C to +70°C) or military (–55°C to +125°C) grades unless explicitly ordered with suffix 'C' or 'M'.

Does the 7025L25PF support battery backup operation, and what voltage is required?

Yes, the 7025L25PF supports battery backup data retention at 2.0 V minimum, as specified in Table 10 of the IDT datasheet. In retention mode, ICCDR is guaranteed ≤ 4000 µA over all temperature ranges, and the device maintains stored data indefinitely as long as VCC ≥ 2.0 V - a key feature distinguishing the 'L' (low-power) variant from the 'S' series.

How does the M/S pin configure master versus slave operation in the 7025L25PF?

When M/S = HIGH, the 7025L25PF operates as a Master: BUSYL and BUSYR become push-pull outputs asserting during port contention. When M/S = LOW, it operates as a Slave: BUSYL and BUSYR become inputs accepting BUSY signals from a Master device. This enables hardware-controlled daisy-chained arbitration without external logic - a defining capability of the 7025L25PF.

Can the 7025L25PF perform simultaneous read and write to the same memory address?

No - simultaneous read and write to the same address triggers hardware arbitration. The 7025L25PF asserts BUSY on the contending port (if configured as Master) or honors BUSY input (if Slave), blocking the write until the other port completes its access. This prevents data corruption and is fundamental to its true dual-port architecture, as detailed in Truth Tables II and III and Waveform Figures 13–14 of DSC 2683/13.

What is the function of the SEM pins on the 7025L25PF, and how are semaphore flags accessed?

The SEML and SEMR pins enable access to eight shared semaphore registers. When SEM = VIL and CE = VIH (or UB&LB = VIH), A0–A2 select one of eight semaphore flags, and I/O0–I/O15 read/write the flag state. This provides atomic lock/unlock capability between ports - critical for resource sharing in multiprocessing systems - and is fully hardware-implemented without software overhead.