Renesas 7007L20PFI

Overview

IDT7007L20PFI from IDT (now Renesas) is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 20 ns max access time (industrial grade), 5 V single-supply operation, and on-chip semaphore/interrupt arbitration logic - used in real-time inter-processor communication systems such as industrial PLCs and avionics data concentrators.

For engineers reviewing the 7007L20PFI datasheet, 7007L20PFI pinout, 7007L20PFI application, or 7007L20PFI equivalent, this page delivers verified timing specs, master/slave BUSY arbitration behavior, TTL-compatible I/O voltage thresholds, industrial temperature support (–40°C to +85°C), and confirmed PLCC-68 package mapping - all extracted from official IDT DSC2940/16 documentation.

Technical Context

The 7007L20PFI implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port. It supports simultaneous read operations to the same memory location and uses hardware-based port arbitration via push-pull BUSY flags and M/S select for master/slave cascading.

It integrates dedicated semaphore registers (8 flags, addressed by A0–A2) and interrupt mailbox logic (INTL/INTR triggered at addresses 7FFE_H and 7FFF_H), enabling lock-free inter-processor synchronization without external logic. All control signals (CEL/CER, R/WL/R/WR, OEL/OER, SEMR/SEML) operate at TTL levels with 5 V ±10% supply.

Key Specifications

Pinout & Package

7007L20PFI is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 24.1 mm × 24.1 mm × 4.3 mm, with 4 corner pins (1, 12, 57, 68) designated as VCC and 6 ground pins (11, 22, 33, 44, 55, 66) - all VCC and GND pins must be externally decoupled.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AC and 70V27L25PF, the 7007L20PFI uniquely delivers TTL-compatible 5 V operation, on-chip semaphore/interrupt logic, and guaranteed 20 ns industrial-grade timing - making it irreplaceable in legacy 5 V dual-CPU systems requiring hardware arbitration.

Availability

7007L20PFI is available at Aetrix Electronics and suitable for industrial PLC backplanes, aerospace data concentrators, and medical imaging real-time buffers requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7007L20PFI 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 semiconductor company specializing in high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The IDT7007 family was designed specifically for real-time inter-processor communication in deterministic embedded systems - delivering hardware-synchronized dual-port access without external arbitration logic.

FAQ

What is the maximum guaranteed access time for 7007L20PFI across its full industrial temperature range?

The 7007L20PFI guarantees a maximum access time (tAA) of 20 ns over the full industrial temperature range of –40°C to +85°C, as specified in Table 12a of the official IDT DSC2940/16 datasheet. This value applies to both left and right ports under VCC = 5.0 V ±10% and includes worst-case process, voltage, and temperature corners.

How does the M/S pin configure 7007L20PFI for master versus slave operation?

When M/S = HIGH, the 7007L20PFI operates as a master: BUSYL and BUSYR become push-pull outputs that assert during port contention. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs that must be driven by an external master to inhibit conflicting writes - enabling cascaded 16-bit+ memory systems.

Can 7007L20PFI perform simultaneous reads from both ports to the same memory address?

Yes - the 7007L20PFI uses true dual-ported SRAM cells that allow simultaneous reads from both left and right ports to identical addresses without contention, delay, or data corruption. This capability is explicitly stated in the "Features" section of the DSC2940/16 datasheet and requires no arbitration overhead.

What are the exact memory addresses used for interrupt mailbox functionality in 7007L20PFI?

The 7007L20PFI uses fixed addresses 7FFE_H (hex) to set the left port interrupt flag (INTL) and 7FFF_H to set the right port interrupt flag (INTR). Clearing is performed by reading those same addresses - e.g., writing to 7FFF_H from the left port asserts INTR, and reading 7FFF_H from the right port clears it.

Does 7007L20PFI support semaphore operations, and how are they accessed?

Yes - the 7007L20PFI includes eight hardware semaphore flags accessible via I/O0–I/O7 and addressed by A0–A2. To access them, SEML or SEMR must be LOW while the corresponding CE is HIGH (CE = VIH, SEM = VIL), as defined in Truth Table II and functional description on page 5 of DSC2940/16.