Renesas 7025L25PFI8

Overview

7025L25PFI8 from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with independent left/right ports, 25 ns maximum read cycle time, 1 mA typical standby current, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access to the same memory location and supports MASTER/SLAVE cascading for 32-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the 7025L25PFI8 datasheet, 7025L25PFI8 pinout, 7025L25PFI8 application, or 7025L25PFI8 equivalent, key selection criteria include dual-port arbitration timing (tBAA ≤ 20 ns), semaphore flag support (8 flags via A0–A2), battery backup capability (2 V data retention), TTL-compatible 5 V ±10% supply, and 100-pin TQFP packaging with verified I/O byte enable control.

Technical Context

The 7025L25PFI8 implements fully asynchronous dual-port operation with on-chip port arbitration logic and hardware semaphore signaling-eight dedicated flags accessible via I/O0–I/O15 and addressed by A0–A2. Its BUSY flag behavior depends on M/S pin state: when M/S = H, BUSY is an output indicating contention; when M/S = L, BUSY is an input used for slave-side write blocking.

It supports two distinct memory access modes: standard RAM access (CE = VIL, UB/LB = VIL, SEM = VIH) and semaphore register access (CE = VIH or UB&LB = VIH, SEM = VIL). The device uses CMOS high-performance fabrication, delivering 750 mW typical active power and 1 µA full-standby current under CMOS-level inputs at 2 V retention voltage.

Key Specifications

Pinout & Package

7025L25PFI8 is packaged in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, 14 mm × 14 mm body size, and exposed thermal pad (not electrically connected). All VCC pins require decoupling; all GND pins must be solidly tied to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-25BGXI and IDT70V25L25PF, the 7025L25PFI8 uniquely delivers industrial-temperature-rated dual-port operation with integrated hardware semaphore and BUSY arbitration-enabling deterministic, low-latency inter-processor communication without external logic or firmware overhead.

Availability

7025L25PFI8 is available at Aetrix Electronics and suitable for industrial motion control, avionics display subsystems, and telecom line card designs requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial temperature performance.

Supply support for 7025L25PFI8 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. It pioneered dual-port SRAM architectures for real-time embedded systems.

The IDT7025 product line was engineered for deterministic inter-processor communication in industrial automation, aerospace, and telecom infrastructure-delivering hardware-accelerated arbitration, battery backup, and industrial temperature reliability in a single monolithic IC.

FAQ

What is the maximum operating frequency supported by the 7025L25PFI8?

The 7025L25PFI8 does not specify a clock frequency but defines timing via cycle times. With a 25 ns maximum read cycle time (tRC), it supports effective throughput up to 40 MHz in synchronous systems. Actual achievable bandwidth depends on bus protocol overhead, but the device guarantees full-speed asynchronous operation with no internal clock-making it ideal for event-driven architectures where deterministic latency matters more than aggregate bandwidth.

Does the 7025L25PFI8 support true simultaneous read/write to the same memory address?

Yes-the 7025L25PFI8 implements true dual-port memory cells that allow concurrent read and write operations to the identical address location. When contention occurs, on-chip arbitration logic asserts the BUSY flag (if configured as Master) or samples BUSY (if Slave) to prevent data corruption. This eliminates the need for external arbitration logic and enables lock-free communication between processors or IP blocks sharing memory space.

How does the semaphore functionality work on the 7025L25PFI8?

The 7025L25PFI8 provides eight hardware semaphore flags accessed via the I/O0–I/O15 bus and addressed by A0–A2. To use them, set SEM = VIL while holding CE and byte enables high (UB&LB = VIH), then perform a write to I/O0 to set a flag or a read to retrieve its state. Each flag operates independently, enabling fine-grained resource locking across multiple tasks or processors without software intervention or polling overhead.

Can the 7025L25PFI8 operate from a 3.3 V supply?

No-the 7025L25PFI8 requires a 5.0 V ±10% supply (4.5 V to 5.5 V) and is not 3.3 V tolerant. Its inputs are TTL-compatible with VIH ≥ 2.2 V and VIL ≤ 0.8 V, but applying 3.3 V to VCC will result in undefined operation and potential data retention failure. For 3.3 V systems, consider the pin-compatible IDT70V25L25PF-but note its commercial-only temperature rating (0°C to +70°C).

What is the significance of the 'L' in the 7025L25PFI8 part number?

The 'L' denotes the low-power variant of the IDT7025 family. Compared to the 'S' (standard) version, the 7025L25PFI8 reduces standby current from 5 mW typ. to 1 mW typ. and enables reliable 2 V data retention-critical for battery-backed applications. All timing specifications (25 ns tRC, 20 ns tBAA, etc.) and functional features (semaphore, BUSY, MASTER/SLAVE) remain identical between 'S' and 'L' variants.