Renesas 70V05L55PF8

Overview

IDT70V05L55PF8 from Renesas Electronics (formerly IDT) is a high-speed 3.3V 8K × 8 dual-port static RAM with true independent left/right ports, 55 ns maximum access time, industrial temperature range (–40°C to +85°C), and integrated semaphore and interrupt logic - used in real-time interprocessor communication, FPGA co-processor buffering, and legacy bus arbitration systems.

For engineers reviewing the IDT70V05L55PF8 datasheet, IDT70V05L55PF8 pinout, IDT70V05L55PF8 application, or IDT70V05L55PF8 equivalent, key selection criteria include simultaneous read capability, BUSY/INT flag timing, master/slave arbitration control, and TQFP-64 package compatibility with legacy 68-pin PLCC footprint adapters.

Technical Context

The IDT70V05L55PF8 implements fully asynchronous dual-port operation with separate address, data, and control buses for left (L) and right (R) ports. It features on-chip port arbitration logic that resolves contention via hardware BUSY signaling and supports both address-match and CE-driven arbitration modes.

It integrates full semaphore functionality across eight flags (addressed by A0–A2), interrupt generation on write-to-specific addresses, and MASTER/SLAVE configuration via the M/S pin - enabling scalable 16-bit+ memory expansion without external logic.

Key Specifications

Pinout & Package

Package: 64-pin Thin Quad Flatpack (TQFP), PN64, body size 14 mm × 14 mm × 1.4 mm. All VDD pins require local 3.3 V decoupling; all VSS pins must be connected to solid ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-55AXC, IDT70V05L55PF8 delivers integrated arbitration and smaller footprint; versus 70V25L55PF8, it offers optimal density and lower power for 64 Kbit requirements - avoiding overspecification and thermal margin loss.

Availability

IDT70V05L55PF8 is available at Aetrix Electronics and suitable for industrial motion controllers, avionics data concentrators, and FPGA-based protocol bridges requiring stable component supply across extended product lifecycles.

Supply support for IDT70V05L55PF8 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 acquired Integrated Device Technology (IDT) in 2019 and maintains full support for legacy IDT memory products including the 70V05 family.

The IDT70V05 series was designed specifically for deterministic interprocessor communication in real-time embedded systems - emphasizing hardware arbitration, low-latency access, and industrial reliability over density or speed scaling.

FAQ

What is the maximum operating frequency supported by the IDT70V05L55PF8?

The IDT70V05L55PF8 does not specify a clock frequency; it is an asynchronous SRAM. Its 55 ns access time (tAA) corresponds to a maximum effective cycle rate of ~12 MHz in worst-case read-modify-write scenarios. For pure read or write cycles, throughput depends on system-level timing margins and bus setup/hold constraints - not an internal clock.

Does the IDT70V05L55PF8 support true simultaneous read and write operations on both ports?

Yes - the IDT70V05L55PF8 supports true simultaneous reads from both ports to the same memory location. However, simultaneous write to the same address triggers hardware arbitration via BUSY, preventing data corruption. Writes to different addresses may occur concurrently without conflict.

How is semaphore functionality implemented in the IDT70V05L55PF8?

The IDT70V05L55PF8 implements eight hardware semaphore flags accessed via A0–A2 address lines. When SEMx = VIL and CEx = VIH, writes to these addresses atomically set/clear flags; reads return flag state. This eliminates software race conditions in multi-processor resource locking.

Can the IDT70V05L55PF8 be used in a MASTER/SLAVE configuration with other IDT70V05L devices?

Yes - the M/S pin configures the IDT70V05L55PF8 as MASTER (BUSY output) or SLAVE (BUSY input). Cascading multiple IDT70V05L55PF8 devices enables 16-bit or wider word systems with full-speed operation and no external arbitration logic required.

What is the meaning of the 'L' and '55' in the IDT70V05L55PF8 part number?

In IDT70V05L55PF8, 'L' denotes the low-power variant (vs. 'S' standard power), and '55' specifies the 55 ns maximum access time. 'PF8' indicates the 64-pin TQFP package with industrial temperature grade (–40°C to +85°C) and lead-free finish.