Renesas 70V05L35J

Overview

IDT70V05L35J from IDT (now part of Renesas) is a high-speed 3.3V 8K × 8 dual-port static RAM with true independent left/right ports, 35 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 70V05L35J datasheet, 70V05L35J pinout, 70V05L35J application, or 70V05L35J equivalent, key selection criteria include dual-port arbitration timing (tAPS, tBDD), BUSY flag behavior under M/S configuration, semaphore address decoding (A0–A2), and compatibility with 3.3V TTL-level control buses in deterministic multi-CPU architectures.

Technical Context

The 70V05L35J implements fully asynchronous dual-port operation with separate address, data, and control buses for left (L) and right (R) ports, enabling simultaneous read/write access to any memory location without external arbitration logic. Its on-chip port arbitration resolves contention via BUSY flag assertion based on address match timing (tAPS) or CE timing, with master/slave mode selected by the M/S pin.

It integrates full hardware semaphore support across eight flags (addressed by A0–A2), interrupt generation (INTL/INTR) triggered by write-to-specific addresses, and automatic power-down per port via CE-driven standby mode - all operating from a single 3.3V ±0.3V supply with no voltage translation required.

Key Specifications

Pinout & Package

70V05L35J is packaged in a 68-pin PLCC (PLG68) with 0.05-inch lead pitch and ceramic body. All VDD pins require decoupling; all GND pins must be solidly grounded. Pin 1 is index corner; orientation follows standard PLCC top-view marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-25AXC and AS7C38098B-25JCIN, the 70V05L35J uniquely combines industrial temperature rating, PLCC packaging, integrated M/S-configurable arbitration, and sub-milliwatt standby - making it optimal for space-constrained, thermally demanding, or legacy-replacement dual-CPU designs.

Availability

70V05L35J is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA co-processing interfaces, legacy bus bridges, avionics data concentrators, and redundant controller architectures requiring stable component supply across extended product lifecycles.

Supply support for 70V05L35J 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 memory, timing, and interface solutions for communications, computing, and industrial markets.

The IDT70V05 family was designed specifically for deterministic interprocessor communication in real-time embedded systems - emphasizing low-latency arbitration, hardware semaphore support, and robust industrial-grade reliability over raw density or speed.

FAQ

What is the maximum access time specification for the 70V05L35J?

The 70V05L35J has a maximum access time of 35 ns across the full industrial temperature range (–40°C to +85°C) and supply voltage (3.3 V ±0.3 V). This value is guaranteed under worst-case conditions including slowest process corner, highest temperature, and lowest supply voltage - ensuring deterministic timing in safety-critical applications where the 70V05L35J is deployed.

How does the M/S pin affect BUSY signal behavior on the 70V05L35J?

When M/S = VIH, the 70V05L35J operates in master mode: BUSYL and BUSYR are push-pull outputs that assert low during port contention. When M/S = VIL, it operates as a slave: BUSYL and BUSYR become inputs used to receive BUSY signals from a master device - enabling hierarchical arbitration in multi-device configurations. This dual-role capability is intrinsic to the 70V05L35J's architecture.

Can the 70V05L35J perform simultaneous reads from both ports to the same memory location?

Yes, the 70V05L35J supports true simultaneous reads from both ports to the same memory address without conflict or performance penalty. Its dual-port memory cell design ensures independent, asynchronous access - a core feature confirmed in the datasheet's "True Dual-Ported memory cells" statement and verified in functional block diagrams and truth tables for the 70V05L35J.

What are the valid address ranges for semaphore register access on the 70V05L35J?

Semaphore register access on the 70V05L35J is controlled by A0–A2 and requires SEM = VIH while CE = VIL. The eight semaphore flags occupy addresses 0x0000–0x0007 within the main memory map - each bit corresponds to one flag, and read/write operations use the same I/O lines (I/O0–I/O7) as main memory. This addressing scheme is explicitly defined in the 70V05L35J's Truth Table II and timing diagrams.

Does the 70V05L35J support power-down mode for individual ports?

Yes, the 70V05L35J supports independent per-port power-down: asserting CEL = VIH places the left port in standby (660 µW typ), while CER = VIH does the same for the right port. This feature is documented in the DC Electrical Characteristics table under "Standby Current" and enables fine-grained power management - a key differentiator of the 70V05L35J versus single-port or non-selective standby SRAMs.