Renesas 7007L55PFI8

Overview

IDT7007L55PFI8 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 - used in real-time interprocessor communication systems requiring simultaneous, asynchronous access to shared memory.

For engineers reviewing the IDT7007L55PFI8 datasheet, IDT7007L55PFI8 pinout, IDT7007L55PFI8 application, or IDT7007L55PFI8 equivalent, key selection considerations include BUSY/INT arbitration timing, semaphore flag support, master/slave cascading capability, standby current (≤13 mA at full CMOS standby), and 80-pin TQFP package compatibility with high-density PCB layouts.

Technical Context

The IDT7007L55PFI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent read/write operations - including simultaneous reads of the same memory location. Its on-chip arbitration logic resolves contention via BUSY flag assertion with tBDD ≤40 ns (M/S = VIH) and tWB = 0 ns (M/S = VIL).

It supports two distinct memory access modes: standard RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH, SEM = VIL), with dedicated A0–A2 addressing for eight semaphore flags. Interrupt signaling uses fixed addresses 7FFE_H (INTL) and 7FFF_H (INTR), each cleared by read or write as defined in Truth Table III.

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 AS7C33256B-55TIN, the IDT7007L55PFI8 uniquely integrates master/slave configuration, hardware semaphores, and interrupt mailboxes in an 80-pin TQFP - reducing BOM count and PCB area in new industrial designs requiring robust interprocessor coordination.

Availability

IDT7007L55PFI8 is available at Aetrix Electronics and suitable for industrial PLC communication hubs, real-time motion controllers, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for IDT7007L55PFI8 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 communications, computing, and industrial markets.

The IDT7007 family was designed specifically for deterministic, low-latency interprocessor communication in hard real-time systems - delivering hardware-arbitrated dual-port SRAM functionality without external glue logic.

FAQ

What is the maximum operating temperature range for the IDT7007L55PFI8?

The IDT7007L55PFI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "Recommended DC Operating Conditions" table (Table 5) and applies across all AC timing parameters including tRC = 55 ns, tAA = 55 ns, and BUSY arbitration delays. The device uses standard CMOS process technology qualified to meet industrial thermal cycling and long-term reliability requirements.

Does the IDT7007L55PFI8 support true simultaneous read operations on both ports to the same memory address?

Yes, the IDT7007L55PFI8 supports true simultaneous reads to the same memory location from both ports - a core feature explicitly stated in the "Features" section ("True Dual-Ported memory cells which allow simultaneous reads of the same memory location"). This behavior is enabled by its dual-port SRAM cell architecture and requires no arbitration or BUSY assertion, unlike concurrent write attempts.

How does the M/S pin affect BUSY signal behavior in the IDT7007L55PFI8?

When M/S = H (Master), BUSYL and BUSYR are push-pull outputs that assert LOW to block writes during contention; when M/S = L (Slave), BUSYL and BUSYR become inputs that must be driven LOW by an external master to inhibit writes. This is documented in Note 1 of the Pin Names table and Truth Table IV, and directly impacts system-level arbitration topology.

What are the exact pin counts and package dimensions of the IDT7007L55PFI8?

The IDT7007L55PFI8 uses an 80-pin TQFP package with body dimensions of 14 mm × 14 mm × 1.4 mm and 0.5 mm lead pitch. This is confirmed in the "Pin Configurations" section (page 3, note 3) and the ordering information footnote specifying "PNG80" as the package code. It is not offered in PLCC or PGA variants under this suffix.

Can the IDT7007L55PFI8 be used in a 16-bit data path configuration?

Yes, the IDT7007L55PFI8 supports 16-bit expansion via Master/Slave cascading: one device configured as Master (M/S = H) and another as Slave (M/S = L) enables full-speed, error-free 16-bit word access without external logic. This capability is explicitly described in the "Description" section and validated by the functional block diagram showing dual 7007L units with BUSY/INT interconnection.