Renesas 7025L55PF

Overview

7025L55PF from IDT (Integrated Device Technology) is a high-speed, low-power 8K × 16-bit dual-port static RAM with true asynchronous dual-port architecture, 55 ns maximum read/write cycle time, 2V data retention capability, and integrated semaphore/arbiter logic for inter-port synchronization. It serves as a stand-alone 128 Kbit memory or master/slave pair in 32-bit+ bus systems in real-time embedded controllers.

For engineers reviewing the 7025L55PF datasheet, 7025L55PF pinout, 7025L55PF application, or 7025L55PF equivalent, key selection criteria include its 55 ns access timing at industrial temperature (–40°C to +85°C), 1 µA typical standby current, TTL-compatible 5 V ±10% supply, and 100-pin TQFP package with full on-chip hardware semaphore support.

Technical Context

The 7025L55PF implements fully independent left/right ports with separate address, control, and 16-bit I/O buses, enabling simultaneous read/write operations-even to the same memory location-via automatic port arbitration. Its BUSY flag and M/S (Master/Slave) select enable deterministic contention resolution without external logic.

It supports battery backup operation down to 2 V with data retention, uses CMOS process for low active power (750 mW typ.), and integrates dedicated SEM, INT, and BUSY signaling with push-pull outputs. Semaphore flags are addressed via A0–A2 and written/read through I/O0–I/O15.

Key Specifications

Pinout & Package

7025L55PF is housed in a 100-pin TQFP (PNG100) package with exposed thermal pad. Pin functions are symmetrically organized for left (L) and right (R) ports, supporting master/slave cascading via M/S pin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-55AXI and IDT70V25L25PF, the 7025L55PF uniquely combines industrial temperature rating, 2V data retention, and integrated hardware semaphore in a 5 V, 55 ns package - making it optimal for ruggedized real-time control where reliability and deterministic inter-port coordination are non-negotiable.

Availability

7025L55PF is available at Aetrix Electronics and suitable for industrial motion control, avionics data buffering, and redundant communication gateway applications requiring stable component supply across extended product lifecycles.

Supply support for 7025L55PF 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 timing, memory interface, RF, and high-performance silicon solutions before its acquisition by Renesas Electronics in 2019.

The 7025L55PF belongs to IDT's legacy high-speed dual-port SRAM family, engineered for deterministic real-time systems where concurrent memory access, low-power standby, and hardware-enforced inter-processor synchronization are critical.

FAQ

What is the guaranteed maximum access time for 7025L55PF over its full industrial temperature range?

The 7025L55PF guarantees a maximum read access time (tAA) of 55 ns across –40°C to +85°C and 5.0 V ±10% supply, as specified in Table 12b of the official datasheet. This value applies to both left and right ports under worst-case conditions and includes all setup, hold, and propagation delays required for valid data output.

Does 7025L55PF support true simultaneous read operations from both ports to the same memory address?

Yes, the 7025L55PF supports true simultaneous reads to the same address via its true dual-ported memory cell architecture. No BUSY assertion occurs during concurrent reads, and both ports deliver valid data independently - a key differentiator from pseudo-dual-port or pipelined SRAMs.

How does the M/S pin configure 7025L55PF for master/slave operation in a 32-bit memory system?

When M/S = HIGH, 7025L55PF operates as a master: BUSYR becomes an output flag indicating contention. When M/S = LOW, it operates as a slave: BUSYR becomes an input that blocks writes until deasserted. This enables cascaded arbitration without external logic when expanding data width beyond 16 bits.

What is the minimum supply voltage required to retain data in 7025L55PF during power loss?

The 7025L55PF retains stored data down to 2.0 V (VDR), as confirmed in Table 10 of the datasheet. This 2V data retention specification is exclusive to the "L" (low-power) variant and enables reliable battery-backup operation in systems subject to brownouts or controlled shutdown sequences.

Can the semaphore flags in 7025L55PF be accessed independently by each port without contention?

Yes - the eight on-chip semaphore flags are shared resources but accessed exclusively via SEM = LOW and proper address decoding (A0–A2). The arbitration logic ensures atomic read-modify-write cycles; simultaneous semaphore access from both ports is resolved deterministically via BUSY and priority timing (tAPS), preventing corruption.