Renesas 7007L55PFI

Overview

IDT7007L55PFI from IDT (now Renesas) is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 55 ns read cycle time, industrial temperature range (–40°C to +85°C), and TTL-compatible 5 V ±10% supply. It enables simultaneous asynchronous access to shared memory in real-time interprocessor communication systems such as industrial PLCs and embedded dual-CPU controllers.

For engineers reviewing the 7007L55PFI datasheet, 7007L55PFI pinout, 7007L55PFI application, or 7007L55PFI equivalent, key selection criteria include guaranteed 55 ns access timing under industrial conditions, on-chip semaphore and interrupt logic for lock-free synchronization, and master/slave cascading support for 16-bit+ data bus expansion without external arbitration logic.

Technical Context

The 7007L55PFI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-no clock required. Its on-chip arbitration logic resolves contention via BUSY flag assertion (push-pull output) when both ports attempt simultaneous write to the same address.

It supports two distinct memory access modes: standard RAM access (CE = LOW, SEM = HIGH) and semaphore register access (CE = HIGH, SEM = LOW), with dedicated A0–A2 addressing for eight semaphore flags. Interrupt flags (INTL/INTR) are triggered by writes to fixed mailbox addresses (7FFE_H/7FFF_H) and cleared by subsequent reads.

Key Specifications

Pinout & Package

7007L55PFI is packaged in an 80-pin TQFP (PNG80), 14 mm × 14 mm × 1.4 mm body, lead-free and RoHS-compliant. All VCC pins require local decoupling; all GND pins must be connected to system ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AC, the 7007L55PFI delivers industrial-grade reliability and built-in synchronization primitives, while R1EX24064ASAS0I lacks the speed, concurrency, and deterministic timing required for dual-CPU buffer applications.

Availability

7007L55PFI is available at Aetrix Electronics and suitable for industrial automation, avionics subsystems, and medical imaging equipment requiring stable component supply with long-term lifecycle assurance.

Supply support for 7007L55PFI 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), now part of Renesas Electronics, designs high-performance timing, memory, and interface ICs for demanding embedded and communications systems.

The IDT7007 family was engineered specifically for deterministic interprocessor communication in real-time control systems, delivering hardware-accelerated memory sharing without software arbitration overhead.

FAQ

What is the maximum guaranteed access time for 7007L55PFI under industrial temperature conditions?

The 7007L55PFI guarantees a maximum read cycle time (tRC) of 55 ns and address access time (tAA) of 55 ns across the full industrial temperature range (–40°C to +85°C) with VCC = 5.0 V ±10%. This specification is production-tested and applies to both left and right ports under worst-case voltage and temperature conditions.

Does 7007L55PFI support true simultaneous read operations on the same memory location?

Yes, the 7007L55PFI implements true dual-ported SRAM cells that allow concurrent reads from both left and right ports to the identical address without contention, BUSY assertion, or timing penalty - a core architectural feature confirmed in the functional block diagram and truth tables.

How does the M/S pin configure 7007L55PFI for master/slave operation in cascaded systems?

When M/S = HIGH, 7007L55PFI operates as Master: BUSYL and BUSYR become push-pull outputs asserting busy state during port contention. When M/S = LOW, it operates as Slave: BUSYL and BUSYR become inputs that inhibit local writes when driven LOW by a Master device - enabling scalable multi-device memory expansion.

Can 7007L55PFI be used without external arbitration logic in a dual-processor system?

Yes, the 7007L55PFI integrates complete hardware arbitration including BUSY flag generation, semaphore registers, and interrupt mailbox logic - eliminating the need for external glue logic or software-based mutual exclusion protocols in standard dual-processor configurations.

What are the valid address ranges for interrupt mailbox functionality in 7007L55PFI?

The 7007L55PFI uses fixed addresses 7FFE_H (32766 decimal) to set the left port interrupt flag (INTL) and 7FFF_H (32767 decimal) to set the right port interrupt flag (INTR). These locations are standard SRAM cells; writing to them with CE/R/W asserted triggers the respective flag, and reading clears it.