Renesas 70V35L20PFI

Overview

IDT70V35L20PFI from Integrated Device Technology is a high-speed 3.3V 8K × 18 true dual-port static RAM with independent left/right ports, 20 ns maximum access time (industrial grade), 660 μW standby power, and on-chip semaphore arbitration logic. It enables simultaneous asynchronous read/write operations to the same memory location in real-time embedded systems requiring deterministic inter-processor communication - such as telecom line cards and industrial motion controllers.

For engineers reviewing the IDT70V35L20PFI datasheet, IDT70V35L20PFI pinout, IDT70V35L20PFI application, or IDT70V35L20PFI equivalent, key selection criteria include its 100-pin TQFP package, LVTTL-compatible 3.3V single supply, BUSY/INT flag signaling, master/slave cascading capability for 36-bit bus expansion, and industrial temperature range (−40°C to +85°C).

Technical Context

This device implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent access without external arbitration logic. Its on-chip hardware semaphore logic supports eight shared flags addressed via A0–A2, with dedicated SEM pins and contention window timing (tSPS = 5 ns) to resolve simultaneous semaphore writes.

The IDT70V35L20PFI uses CMOS high-performance fabrication for low-power operation: typical active current is 140 mA (both ports active), while full standby current drops to 0.2 mA under CMOS-level input conditions. It supports R/W-controlled and CE/UB/LB-controlled write cycles with defined tDW (15 ns), tWP (20 ns), and tEW (20 ns) parameters per industrial-grade timing spec.

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and AS7C33160B-20TIN, the IDT70V35L20PFI uniquely delivers 18-bit data width, integrated master/slave BUSY signaling, and hardware semaphore arbitration - making it optimal for deterministic real-time inter-processor communication where timing predictability and bus expansion are critical.

Availability

IDT70V35L20PFI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, avionics sensor fusion, and medical imaging systems requiring stable component supply across extended product lifecycles.

Supply support for IDT70V35L20PFI 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs for communications and computing markets.

The IDT70V35L20PFI belongs to IDT's high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems where concurrent access, low latency, and hardware arbitration are mandatory.

FAQ

What is the maximum operating temperature range for the IDT70V35L20PFI?

The IDT70V35L20PFI is rated for industrial temperature operation from −40°C to +85°C. This specification is guaranteed across all electrical parameters including 20 ns access time, 660 μW standby power, and full semaphore functionality - making it suitable for deployment in harsh environments like factory floors, outdoor telecom cabinets, and vehicle-mounted systems.

Does the IDT70V35L20PFI support true simultaneous read/write operations to the same memory address?

Yes, the IDT70V35L20PFI implements true dual-port SRAM cells that allow independent, asynchronous read and write operations to the exact same memory location from left and right ports. This capability is fundamental to its use in real-time inter-processor communication, eliminating bus contention and ensuring deterministic data exchange without software arbitration overhead.

How does the master/slave configuration work on the IDT70V35L20PFI?

The IDT70V35L20PFI uses the M/S pin to configure its role: when M/S = VIH, BUSYL becomes an output flag indicating local port contention; when M/S = VIL, BUSYR becomes an input accepting BUSY signals from upstream masters. This enables daisy-chained cascading of multiple IDT70V35L20PFI devices to build 36-bit or wider memory systems without external logic.

What is the function of the SEM pins on the IDT70V35L20PFI?

The SEML and SEMR pins on the IDT70V35L20PFI enable hardware semaphore access mode. When SEM = VIL, the device enters semaphore register space (addressed by A0–A2), allowing eight shared flags to be read/written atomically. This provides lock-free inter-processor synchronization with a guaranteed 5 ns contention window (tSPS), critical for real-time deterministic systems.

Is the IDT70V35L20PFI pin-compatible with other members of the IDT70V35/34 family?

Yes, the IDT70V35L20PFI shares identical 100-pin TQFP pinout with all IDT70V35/34 variants (e.g., IDT70V35S15PF, IDT70V34L20PFI), including matching address, data, control, and power pin assignments. Differences are limited to internal speed grade (20 ns vs. 15 ns) and power optimization (L vs. S), allowing drop-in replacement within the same temperature grade and package.