Renesas 7008L55PFI8

Overview

IDT7008L55PFI8 from IDT (Integrated Device Technology) is a high-speed 64K × 8 true dual-port static RAM with independent left/right ports, 55 ns maximum access time, TTL-compatible 5 V ±10% operation, and integrated semaphore/arbitration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the IDT7008L55PFI8 datasheet, IDT7008L55PFI8 pinout, IDT7008L55PFI8 application, or IDT7008L55PFI8 equivalent, key selection considerations include its 55 ns industrial-grade timing, low 1 mW standby power, Master/Slave BUSY arbitration support, and 100-pin TQFP package with full port isolation and semaphore flag management.

Technical Context

The IDT7008L55PFI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling simultaneous read/write to the same memory location without contention. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion and supports hardware semaphore signaling across eight flags addressed by A0–A2.

It operates in Master mode (M/S = VIH) with BUSY as output or Slave mode (M/S = VIL) with BUSY as input, enabling cascaded 16-bit+ memory expansion without external logic. The device uses CMOS process technology and features automatic power-down via CE0/CE1 enables, delivering 1 mW typical standby current at industrial temperature range (–40°C to +85°C).

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant and green (halogen-free) construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and AS7C364B-55PCN, the IDT7008L55PFI8 uniquely delivers industrial temperature support, integrated semaphore/BUSY arbitration, and native 5 V TTL compatibility-making it optimal for ruggedized, real-time inter-processor communication where deterministic latency and hardware-enforced coherency are mandatory.

Availability

IDT7008L55PFI8 is available at Aetrix Electronics and suitable for industrial automation, avionics data buffering, and medical imaging systems requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial temperature performance.

Supply support for IDT7008L55PFI8 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 timing, memory interface, RF, and real-time interconnect solutions for communications, computing, and industrial markets.

The IDT7008L55PFI8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where hardware arbitration and seamless 5 V integration are critical.

FAQ

What is the operating temperature range specified for the IDT7008L55PFI8?

The IDT7008L55PFI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including 55 ns access time, standby current (1 mW typ), and BUSY arbitration timing-ensuring reliable performance in harsh environments such as factory floors, rail vehicles, and outdoor base stations. The "I" in the suffix "PFI8" explicitly denotes industrial grade.

Does the IDT7008L55PFI8 support true simultaneous read operations on both ports to the same memory address?

Yes, the IDT7008L55PFI8 implements true dual-port SRAM cells that permit concurrent reads from both left and right ports to the identical memory location without conflict or timing penalty. This capability is fundamental to its architecture and is explicitly confirmed in the Functional Description section of the datasheet, enabling lock-free data sharing in multi-CPU systems.

How does the BUSY arbitration logic function in Master versus Slave configuration for the IDT7008L55PFI8?

In Master mode (M/S = VIH), BUSYL and BUSYR are push-pull outputs that assert low to block writes when address contention occurs. In Slave mode (M/S = VIL), BUSYL and BUSYR become inputs-driven low by a Master device to inhibit writes on the Slave port. This hardware handshake enables deterministic, cycle-accurate resolution of port conflicts without software intervention.

What are the valid address ranges used for interrupt flag generation in the IDT7008L55PFI8?

The IDT7008L55PFI8 uses fixed addresses FFFE_H (65534) and FFFF_H (65535) for interrupt signaling: writing to FFFE_H from the right port asserts INTL, and writing to FFFF_H from the left port asserts INTR. These locations function as user-defined mailboxes when interrupts are enabled; otherwise, they behave as standard SRAM addresses within the 64K space.

Can the IDT7008L55PFI8 be used in a 16-bit data path configuration, and if so, how is it implemented?

Yes, the IDT7008L55PFI8 supports 16-bit expansion using its Master/Slave cascade capability. Two devices are configured-one as Master (M/S = VIH), one as Slave (M/S = VIL)-with BUSY lines interconnected. The Master's BUSY output drives the Slave's BUSY input, enabling coordinated arbitration across both devices' 8-bit ports to form a unified 16-bit-wide memory interface without external glue logic.