Renesas 70V35L20PFGI

Overview

70V35L20PFGI 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 communication systems requiring deterministic inter-processor data exchange.

For engineers reviewing the 70V35L20PFGI datasheet, 70V35L20PFGI pinout, 70V35L20PFGI application, or 70V35L20PFGI equivalent, key selection criteria include industrial temperature support (–40°C to +85°C), TQFP-100 packaging, LVTTL-compatible 3.3V operation, and hardware-supported BUSY/INT flag signaling for master/slave memory expansion.

Technical Context

The 70V35L20PFGI 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 arbitration resolves contention via BUSY flag assertion and supports semaphore read/write using A0–A2 addressing of eight dedicated flags.

It features separate upper-byte (I/O9–I/O17) and lower-byte (I/O0–I/O8) controls for multiplexed bus compatibility, and Master/Slave select (M/S) pin configures BUSY as output (Master) or input (Slave) when cascading multiple devices for 36-bit-wide memory systems.

Key Specifications

Pinout & Package

70V35L20PFGI is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, 14 mm × 14 mm footprint, and 1.4 mm height. All VDD (pins 24, 41, 60, 79) and VSS (pins 25, 42, 61, 80, 100) pins require local decoupling. A12 is no-connect on this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-200BZI and AS7C3256A-20JIN, the 70V35L20PFGI delivers autonomous hardware arbitration and true asynchronous dual-port operation in a drop-in industrial-grade package-reducing BOM count and firmware complexity for real-time inter-processor communication.

Availability

70V35L20PFGI is available at Aetrix Electronics and suitable for industrial PLC backplanes, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for 70V35L20PFGI 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, specializes in high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.

The 70V35L20PFGI belongs to IDT's legacy high-speed dual-port SRAM family, engineered specifically for deterministic inter-processor communication in real-time embedded systems demanding hardware arbitration and industrial reliability.

FAQ

What is the maximum operating temperature range for the 70V35L20PFGI?

The 70V35L20PFGI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including access time (20 ns max), standby current (660 µW typ.), and I/O voltage thresholds. The device uses CMOS high-performance fabrication to maintain timing integrity and leakage control across this full range, making it suitable for under-hood automotive modules and factory-floor programmable logic controllers.

Does the 70V35L20PFGI support hardware semaphore functionality?

Yes, the 70V35L20PFGI includes full on-chip hardware semaphore logic supporting eight independent flags. These are accessed via A0–A2 address lines with SEM enable active-low, and support atomic read/write operations. The 70V35L20PFGI implements tSWRD (5 ns) and tSPS (5 ns) timing to guarantee safe flag contention resolution between ports-eliminating the need for software locks or external arbitration circuitry in multiprocessing designs.

What package type and pin count does the 70V35L20PFGI use?

The 70V35L20PFGI is packaged in a 100-pin Thin Quad Flatpack (TQFP) with PNG100 footprint (14 mm × 14 mm × 1.4 mm). It has four VDD pins (24, 41, 60, 79), five VSS pins (25, 42, 61, 80, 100), and A12 is designated no-connect per datasheet note. This package is RoHS-compliant and qualified for standard lead-free reflow profiles, ensuring compatibility with automated SMT assembly lines.

How does the Master/Slave configuration work on the 70V35L20PFGI?

The M/S pin on the 70V35L20PFGI configures BUSY pin behavior: when driven high (VIH), the device operates as Master and asserts BUSY as an output flag during port contention; when driven low (VIL), it operates as Slave and accepts BUSY as an input to stall writes until the Master releases the resource. This enables seamless cascading of multiple 70V35L20PFGI devices to construct wider memory buses (e.g., 36-bit) without external logic.

What is the standby power consumption of the 70V35L20PFGI?

The 70V35L20PFGI achieves 660 µW typical standby power (ISB3 condition) when both ports are disabled with CMOS-level inputs held valid (VIN > VDD − 0.2 V or VIN < 0.2 V). This ultra-low quiescent draw is enabled by internal power-gating circuitry activated via CE deassertion, making the 70V35L20PFGI suitable for battery-backed systems and thermally constrained enclosures where heat dissipation must be minimized during idle states.