Renesas 7007L25PFI

Overview

IDT7007L25PFI from IDT (now Renesas) is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 25 ns maximum access time, industrial temperature range (–40°C to +85°C), and full on-chip semaphore and interrupt logic - used in real-time interprocessor communication systems requiring concurrent memory access without arbitration overhead.

For engineers reviewing the IDT7007L25PFI datasheet, IDT7007L25PFI pinout, IDT7007L25PFI application, or IDT7007L25PFI equivalent, key selection considerations include its 80-pin TQFP package, master/slave cascading capability via M/S pin, BUSY-flag arbitration for conflict resolution, and support for simultaneous read/write to same location with deterministic port priority.

Technical Context

The IDT7007L25PFI implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (left: A0L–A14L, I/O0L–I/O7L; right: A0R–A14R, I/O0R–I/O7R), enabling independent read/write operations without external logic. Its on-chip arbitration logic resolves contention using BUSY flag assertion based on address match or chip enable timing.

It supports two distinct memory access modes: standard RAM access (CE = LOW, SEM = HIGH) and semaphore register access (CE = HIGH, SEM = LOW), with dedicated INTL/INTR flags and eight hardware semaphores addressed by A0–A2. The M/S pin configures the device as master (BUSY output) or slave (BUSY input) for multi-device 16-bit+ bus expansion.

Key Specifications

Pinout & Package

Package: 80-pin Thin Quad Flat Pack (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-25AC and R1EX24032AS0C-25, the IDT7007L25PFI uniquely integrates M/S-selectable cascading, unified BUSY arbitration, and eight hardware semaphores - reducing BOM count and eliminating timing-critical FPGA logic in multi-processor interconnects.

Availability

IDT7007L25PFI is available at Aetrix Electronics and suitable for industrial PLC communication, real-time multi-core DSP systems, and avionics data concentrators requiring stable component supply, long-lifecycle support, and guaranteed industrial-grade qualification.

Supply support for IDT7007L25PFI 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

Renesas Electronics Corporation (formerly Integrated Device Technology) is a global semiconductor leader specializing in microcontrollers, analog, power management, and high-performance memory solutions for industrial, automotive, and communications markets.

The IDT7007L25PFI belongs to Renesas' legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in hard real-time systems where software arbitration introduces unacceptable jitter or latency.

FAQ

What is the maximum operating temperature range for the IDT7007L25PFI?

The IDT7007L25PFI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the manufacturer's datasheet (DSC 2940/16, September 2019) and applies to all AC and DC electrical characteristics within the 25 ns speed grade. It ensures reliable performance in factory automation, motor control, and outdoor communications equipment without derating.

Does the IDT7007L25PFI support true simultaneous read operations from both ports to the same memory address?

Yes, the IDT7007L25PFI implements true dual-port SRAM cells that allow concurrent reads from identical addresses on the left and right ports without contention or timing penalty. This behavior is explicitly confirmed in the "Features" section of the datasheet and enables lock-free data sharing in symmetric multiprocessing environments where both processors require consistent snapshot access.

How does the M/S pin affect BUSY signal behavior on the IDT7007L25PFI?

When M/S = HIGH, the IDT7007L25PFI operates as a master: BUSYL and BUSYR are push-pull outputs asserting active-low during arbitration. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs that must be driven externally to inhibit writes - a configuration required when cascading multiple devices for wider data buses per the master/slave expansion architecture.

What are the valid address ranges for interrupt mailbox functionality in the IDT7007L25PFI?

The IDT7007L25PFI uses fixed addresses for interrupt signaling: writing to 7FFFh (hex) on the left port asserts INTR on the right port, and writing to 7FFEh (hex) on the right port asserts INTL on the left port. These locations are user-defined SRAM cells - not reserved registers - and retain full read/write functionality whether interrupts are enabled or unused in the application.

Can the IDT7007L25PFI be used in a single-port configuration?

Yes, the IDT7007L25PFI can operate with only one port active: tie CEL or CER HIGH to disable the corresponding port, placing it in ultra-low ISB3 standby mode (0.2 mA typ.). The enabled port functions identically to a standard 32K × 8 SRAM with full 25 ns access, making it suitable for cost-sensitive upgrades where dual-port capability is retained for future expansion.