Renesas 7005L55PFI8

Overview

7005L55PFI8 from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right port access, 55 ns maximum read cycle time (tRC), 2V data retention capability, and integrated hardware semaphore/arbitration logic - used in real-time inter-processor communication systems requiring concurrent memory access without external logic.

For engineers reviewing the 7005L55PFI8 datasheet, 7005L55PFI8 pinout, 7005L55PFI8 application, or 7005L55PFI8 equivalent, this page delivers verified timing specs (tRC = 55 ns), industrial temperature support (–40°C to +85°C), dual-port arbitration behavior, BUSY/INT signal timing, and exact TQFP-64 pin mapping per official IDT documentation.

Technical Context

The 7005L55PFI8 implements fully asynchronous dual-port operation: each port (left/right) has independent address (A0L–A12L / A0R–A12R), data (I/O0L–I/O7L / I/O0R–I/O7R), and control lines (CEL/CER, R/WL/R/WR, OEL/OER). It supports simultaneous reads of the same location and uses on-chip arbitration to resolve contention via BUSY flag assertion.

Hardware semaphore signaling is implemented using dedicated SEM pins (SEML/SEMR) and address bits A0–A2 to access eight shared flags; interrupt generation (INTL/INTR) is triggered by writes to specific addresses (e.g., 1FFFh for set, 1FFEh for reset), with tINS/tINR ≤ 40 ns at 55 ns speed grade.

Key Specifications

Pinout & Package

64-pin thin quad flatpack (TQFP) package with 0.5 mm pitch; body dimensions 14 mm × 14 mm × 1.4 mm; lead finish matte tin; RoHS-compliant and green-part qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and AS7C38098B-55JCIN, the 7005L55PFI8 uniquely integrates full hardware arbitration, semaphore, and interrupt signaling in a pin-compatible 64-pin TQFP - reducing BOM count, PCB area, and firmware complexity for real-time dual-processor systems.

Availability

7005L55PFI8 is available at Aetrix Electronics and suitable for industrial motion control, avionics data exchange, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for 7005L55PFI8 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) is a fabless semiconductor company specializing in timing, memory interface, and RF solutions, now part of Renesas Electronics since 2019.

The IDT7005 family was designed specifically for high-reliability dual-processor communication in industrial, aerospace, and medical systems where deterministic latency and hardware-enforced coherency are mandatory.

FAQ

What is the maximum operating temperature range for the 7005L55PFI8?

The 7005L55PFI8 is rated for industrial temperature operation from –40°C to +85°C. This range is validated across all AC and DC electrical parameters in the official IDT datasheet (Rev. Feb.14.20), including 55 ns access time and 2V data retention performance. No derating is required within this span.

Does the 7005L55PFI8 support true simultaneous reads from both ports to the same memory location?

Yes, the 7005L55PFI8 implements true dual-port SRAM cells that allow concurrent read operations from both left and right ports to identical addresses without contention or BUSY assertion. This behavior is explicitly confirmed in the "Features" section and functional block diagram of the IDT7005 datasheet.

How does the M/S pin affect BUSY signal behavior on the 7005L55PFI8?

When M/S = H, the 7005L55PFI8 operates as master: BUSYL and BUSYR are push-pull outputs asserting low during port contention. When M/S = L, it operates as slave: BUSYL and BUSYR become inputs that inhibit local writes when driven low by a master device - enabling cascaded master/slave configurations.

What is the purpose of the SEM pins on the 7005L55PFI8, and how are semaphores accessed?

The SEML and SEMR pins enable hardware semaphore register access. With SEM = L, writes to addresses 000h–007h (A2–A0 decoded) set/clear eight shared flags; reads return flag status. This eliminates software spinlocks and provides atomic, low-latency inter-processor signaling - a core feature confirmed in Truth Table II and Pin Names table.

Can the 7005L55PFI8 retain data during main power loss, and what voltage is required?

Yes, the 7005L55PFI8 supports data retention at VCC = 2.0 V minimum, as specified in Table 9 (Data Retention Characteristics). This allows connection to a backup battery or supercapacitor to preserve memory contents during primary power interruption - a key capability of the "L" (low-power) variant.