Renesas 7007L55PF

Overview

IDT7007L55PF 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 inter-processor communication systems such as industrial PLCs and embedded motion controllers.

For engineers reviewing the IDT7007L55PF datasheet, IDT7007L55PF pinout, IDT7007L55PF application, or IDT7007L55PF equivalent, key selection considerations include BUSY/INT arbitration timing, M/S master/slave cascading capability, semaphore flag support, and 80-pin TQFP package compatibility with high-density PCB layouts.

Technical Context

The IDT7007L55PF implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-no internal clock required. Its on-chip arbitration logic resolves contention via BUSY flag assertion (push-pull output) when address matches occur across ports, with tBDD ≤ 40 ns for valid data recovery after contention.

It supports two distinct memory access modes: standard RAM access (CE = LOW, SEM = HIGH) and semaphore register access (CE = HIGH, SEM = LOW), using A0–A2 to select among eight hardware semaphore flags. Interrupt signaling uses dedicated INTL/INTR pins tied to fixed addresses 7FFE_H (left) and 7FFF_H (right).

Key Specifications

Pinout & Package

Package: 80-pin thin quad flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and R1EX24032AS0A, the IDT7007L55PF delivers integrated arbitration, semaphore, and interrupt logic in a single package-reducing system-level complexity, PCB footprint, and qualification effort for safety-critical dual-processor architectures.

Availability

IDT7007L55PF is available at Aetrix Electronics and suitable for industrial PLCs, real-time motion controllers, redundant safety systems, and avionics health monitors requiring stable component supply across extended production lifecycles.

Supply support for IDT7007L55PF 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, is a fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for industrial, communications, and computing markets.

The IDT7007L55PF belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic inter-processor communication in hard real-time embedded systems where hardware arbitration and low-latency memory sharing are mandatory.

FAQ

What is the maximum operating frequency supported by the IDT7007L55PF?

The IDT7007L55PF does not operate from a clock signal-it is fully asynchronous. Its maximum effective throughput is determined by its 55 ns read cycle time (tRC), supporting up to approximately 18.2 million random reads per second. This timing is guaranteed across the full industrial temperature range (–40°C to +85°C) and 4.5 V to 5.5 V supply.

Does the IDT7007L55PF require external pull-up resistors on BUSY or INT pins?

No. The IDT7007L55PF features push-pull outputs on BUSYL, BUSYR, INTL, and INTR pins-no external pull-ups are needed. These outputs drive actively HIGH or LOW, simplifying interface design and eliminating uncertainty in rise/fall times that can occur with open-drain configurations.

How does the M/S pin affect the BUSY functionality in the IDT7007L55PF?

When M/S = HIGH, the IDT7007L55PF operates as a master: BUSYL and BUSYR become push-pull outputs that assert LOW during port contention. When M/S = LOW, it acts as a slave: BUSYL and BUSYR become inputs that must be driven LOW by an external master to inhibit local writes-enabling hierarchical arbitration in multi-device systems.

Can the IDT7007L55PF be used for semaphore-only operations without accessing main memory?

Yes. By holding CEL and CER HIGH (disabled) and setting SEM = LOW, the IDT7007L55PF enters semaphore mode. In this mode, A0–A2 select one of eight flags, I/O0 writes the flag value, and all I/O0–I/O7 reflect the current flag state-allowing dedicated hardware signaling independent of main memory access.

What is the power consumption difference between active and full standby modes for the IDT7007L55PF?

In dynamic operation (both ports active), the IDT7007L55PF draws up to 270 mA (ICC). In full standby (ISB3), with all inputs held at valid CMOS levels and CE high, consumption drops to just 5 µA max-reducing system power by >99.9% compared to active mode, ideal for battery-backed or energy-harvesting applications.