Renesas 7025L55PFI

Overview

7025L55PFI from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with independent asynchronous left/right ports, 55 ns maximum read cycle time, 2V data retention capability, and industrial temperature range (–40°C to +85°C). It enables simultaneous 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 7025L55PFI datasheet, 7025L55PFI pinout, 7025L55PFI application, or 7025L55PFI equivalent, key selection considerations include dual-port arbitration timing (tBDD ≤ 30 ns), low standby current (1 µA typical at 2V), TTL-compatible 5V ±10% operation, and semaphore flag support for inter-processor synchronization in deterministic systems.

Technical Context

The 7025L55PFI implements full on-chip hardware semaphore logic with eight addressable flags (A0–A2), enabling atomic resource locking between ports without external logic. Its port arbitration resolves contention via BUSY flag assertion-either by address match (M/S = H) or chip enable timing-with priority set-up time tAPS = 5 ns.

It operates fully asynchronously from either port, supports separate upper-byte (UB/UBR) and lower-byte (LB/LBR) control for multiplexed bus compatibility, and features automatic power-down via Chip Enable (CE) with two-tier standby modes: TTL-level (ISB1 = 13 mA max) and CMOS-level (ISB3 = 0.2 µA typical).

Key Specifications

Pinout & Package

7025L55PFI is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead geometry, 1.15″ × 1.15″ body size, and standard PLCC land pattern. Pin 1 is marked by a notch on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-55JC and AS7C3256B-55PC, the 7025L55PFI delivers unique value through on-die semaphore logic and 2V data retention-reducing system-level design effort and enabling battery-backed operation without external components.

Availability

7025L55PFI is available at Aetrix Electronics and suitable for real-time motion control, avionics display buffering, and redundant flight controller memory requiring stable component supply across extended product lifecycles.

Supply support for 7025L55PFI 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.

The IDT7025 family was designed specifically for deterministic, low-latency inter-processor communication in military, aerospace, and industrial real-time systems-emphasizing hardware arbitration, data integrity under power stress, and wide-temperature reliability.

FAQ

What is the guaranteed maximum access time for the 7025L55PFI under industrial temperature conditions?

The 7025L55PFI guarantees a maximum read cycle time (tRC) of 55 ns across its full industrial operating range (–40°C to +85°C) with VCC = 5.0 V ±10%. This specification is production-tested and applies to both ports under worst-case voltage and temperature conditions, ensuring deterministic timing for hard real-time applications.

Does the 7025L55PFI support true simultaneous read operations from both ports to the same memory address?

Yes, the 7025L55PFI implements true dual-port memory cells that permit simultaneous reads from both left and right ports to the identical memory location without contention or delay. This capability is intrinsic to its silicon architecture and does not require external arbitration-enabling lock-free data sharing in multi-processor systems.

How does the M/S pin affect BUSY signal behavior in the 7025L55PFI?

When M/S = H (high), the 7025L55PFI operates as Master: BUSYL/BUSYR become push-pull outputs asserting during port contention. When M/S = L (low), it operates as Slave: BUSYL/BUSYR become inputs, allowing external BUSY signals from a Master device to gate writes-enabling hierarchical arbitration in multi-device configurations.

What is the minimum supply voltage required to retain data in the 7025L55PFI during power loss?

The 7025L55PFI retains stored data down to VCC = 2.0 V, as specified in its data retention characteristics. At this voltage, typical ICCDR is 100 µA (max 4000 µA over full temperature range), enabling reliable state preservation during brown-out or battery-backup scenarios without data corruption.

Can the 7025L55PFI be used in a 32-bit data bus configuration without external logic?

Yes-the 7025L55PFI supports 32-bit expansion via its MASTER/SLAVE cascading architecture. Two devices can be configured with one as Master (M/S = H) and one as Slave (M/S = L), using BUSY handshake and dedicated M/S pin to coordinate access-eliminating need for external multiplexers or arbitration ICs.