Renesas 7025L55PFI8

Overview

7025L55PFI8 from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with 55 ns maximum read/write cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It supports simultaneous independent access from left and right ports, on-chip semaphore arbitration, and battery-backed data retention at 2V - used in real-time embedded systems requiring deterministic memory coherency between two processors or DMA engines.

For engineers reviewing the 7025L55PFI8 datasheet, 7025L55PFI8 pinout, 7025L55PFI8 application, or 7025L55PFI8 equivalent, key selection criteria include dual-port arbitration latency (tBDD ≤ 30 ns), low standby current (ISB3 = 0.2 mA typ.), 2V data retention capability, and compatibility with master/slave cascading for 32-bit+ bus expansion.

Technical Context

The 7025L55PFI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves contention via BUSY flag assertion (M/S = H for master output; M/S = L for slave input), and supports eight hardware semaphores addressed by A0–A2 for inter-processor synchronization.

It features independent byte-enable (UBL/LBL, UBR/LBR), chip enable (CEL/CER), and output enable (OEL/OER) per port, enabling multiplexed bus interfacing and partial-word writes. The device enters full standby mode (ISB3 = 0.2 mA typ.) when both CE inputs are high and all inputs are held at valid CMOS levels.

Key Specifications

Pinout & Package

7025L55PFI8 is packaged in an 84-pin PLCC (Plastic Leaded Chip Carrier) with 0.050" lead pitch and JEDEC MS-026AC footprint. Pin assignments follow standard IDT7025 dual-port layout with mirrored left/right port signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and AS7C38097A-55PCN, the 7025L55PFI8 uniquely delivers integrated hardware arbitration, 2V data retention, and true 5V TTL compatibility - making it the only drop-in solution for legacy industrial systems requiring zero-modification memory coherency.

Availability

7025L55PFI8 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC backplanes, and redundant communication controllers requiring stable component supply across extended product lifecycles.

Supply support for 7025L55PFI8 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 ICs before its acquisition by Renesas Electronics in 2019.

The IDT7025 product line was designed specifically for deterministic dual-processor architectures in industrial automation, avionics, and telecommunications equipment where memory coherency and sub-microsecond arbitration latency are mandatory.

FAQ

What is the maximum operating temperature range for the 7025L55PFI8?

The 7025L55PFI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all AC and DC electrical parameters in the official IDT datasheet DSC 2683/13, and applies to the 55 ns speed grade in the PLCC package. It does not support military-grade (–55°C to +125°C) operation.

Does the 7025L55PFI8 support battery backup operation, and what voltage is required?

Yes, the 7025L55PFI8 supports battery backup data retention at VCC = 2.0 V minimum, as specified in Table 10 of the datasheet. This feature is exclusive to the "L" (low-power) variant and is guaranteed across the full industrial temperature range. The device draws only 100 µA typical (max 4000 µA) in retention mode.

How does the BUSY arbitration mechanism work on the 7025L55PFI8?

The 7025L55PFI8 uses hardware-based BUSY arbitration: when both ports attempt simultaneous access to the same memory location, the BUSY flag asserts within tBAA ≤ 20 ns (M/S = H) to block the later-arriving write. The BUSY signal is driven by the master port and received by the slave port - enabling daisy-chained multi-device systems without external logic.

Can the 7025L55PFI8 be used in a 32-bit data bus configuration?

Yes, the 7025L55PFI8 supports 32-bit expansion via master/slave cascading. Two devices are configured with M/S = H (master) and M/S = L (slave); the master's BUSY output connects to the slave's BUSY input. This configuration maintains full 55 ns performance without additional discrete logic, as confirmed in the Functional Description section of DSC 2683/13.

What is the standby current consumption of the 7025L55PFI8 under full CMOS-level disable conditions?

Under full standby (ISB3 condition), where both CEL and CER are held > VCC − 0.2 V and all inputs are at valid CMOS levels, the 7025L55PFI8 consumes 0.2 mA typical (5 µA max) current. This value is documented in Table 9a of the datasheet and is a defining characteristic of the "L" (low-power) variant versus the "S" version.