Renesas 70V35L20PFGI8

Overview

70V35L20PFGI8 from IDT (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 on both ports-used in real-time inter-processor communication, FPGA co-processor buffering, and telecom line-card memory sharing.

For engineers reviewing the 70V35L20PFGI8 datasheet, 70V35L20PFGI8 pinout, 70V35L20PFGI8 application, or 70V35L20PFGI8 equivalent, key selection criteria include industrial temperature support (–40°C to +85°C), TQFP-100 package compatibility, dual-port bus width expansion capability (up to 36-bit via master/slave cascading), and integrated hardware semaphore signaling for resource contention management.

Technical Context

The 70V35L20PFGI8 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 port conflicts using BUSY flag signaling and supports master/slave configuration via M/S pin for multi-device memory expansion.

It integrates full hardware semaphore logic with eight dedicated flags (addressed by A0–A2), allowing atomic read-modify-write operations across ports. All I/Os are LVTTL-compatible, operating from a single 3.3 V ±0.3 V supply, with automatic power-down controlled by CE pins per port.

Key Specifications

Pinout & Package

70V35L20PFGI8 is housed in a 100-pin Thin Quad Flatpack (TQFP, package code PNG100) with 0.5 mm pitch, 14 mm × 14 mm body size, and 1.4 mm height. Pin assignments follow standard dual-port layout with mirrored left/right port signals and dedicated arbitration pins (BUSY, INT, SEM, M/S).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-200BZXI and AS7C3256A-20JCIN, the 70V35L20PFGI8 uniquely delivers true asynchronous dual-port operation with integrated hardware arbitration-reducing BOM count, PCB area, and firmware complexity in real-time inter-processor systems.

Availability

70V35L20PFGI8 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and automotive ADAS applications requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for 70V35L20PFGI8 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT70V35 family targets real-time embedded systems requiring deterministic, low-latency shared memory-specifically engineered for inter-processor communication, FPGA co-processing, and telecom buffering where hardware arbitration and industrial temperature resilience are critical.

FAQ

What is the maximum operating temperature range for the 70V35L20PFGI8?

The 70V35L20PFGI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and DC Electrical Characteristics section of the official IDT datasheet (DSC-5624/10). The device maintains full functionality-including 20 ns access time and 660 µW standby power-across this entire range, making it suitable for deployment in harsh environments such as factory floors, outdoor telecom cabinets, and vehicle under-hood modules.

Does the 70V35L20PFGI8 support true simultaneous read/write operations on both ports?

Yes, the 70V35L20PFGI8 implements a true dual-port SRAM architecture that allows independent, fully asynchronous read and write operations on the left and right ports-even to the same memory address. This capability is enabled by physically separate memory cell arrays per port and verified in the Functional Block Diagram and Truth Table I of the datasheet. No external arbitration logic is needed, and the device uses BUSY flag signaling to resolve contention when both ports attempt conflicting accesses.

How does the semaphore function work on the 70V35L20PFGI8?

The 70V35L20PFGI8 includes eight dedicated hardware semaphore flags accessed via A0–A2 address lines. When SEM is asserted low and CE/UB/LB are high, the device enters semaphore mode-allowing atomic read-modify-write operations on the flags. This is documented in Truth Table II and supported by timing parameters tSAA (15 ns max) and tSWRD (5 ns). The feature enables deterministic resource locking between processors without software intervention, directly reducing interrupt latency and race condition risk in the 70V35L20PFGI8-based system.

What package type and pin count does the 70V35L20PFGI8 use?

The 70V35L20PFGI8 is packaged in a 100-pin Thin Quad Flatpack (TQFP) with package code PNG100, measuring 14 mm × 14 mm × 1.4 mm. This is explicitly stated in the Pin Configurations section and confirmed by the top-view diagram labeled "70V35/34 PNG100(5)" in the datasheet. All 100 pins are assigned per the detailed pinout table-including dedicated left/right control, address, and I/O signals-and A12 is designated as no-connect (NC) for this variant, consistent with IDT70V35 family specifications.

Is the 70V35L20PFGI8 pin-compatible with other members of the IDT70V35/34 family?

Yes, the 70V35L20PFGI8 shares identical pinout and package (100-pin TQFP) with all IDT70V35/34 variants-including 70V35S15, 70V35S20, 70V34L20, and 70V34S15-as confirmed by the unified "70V35/34 PNG100" pin diagram and Notes 1 and 2 in the Pin Configurations section. Differences are limited to speed grade (15/20/25 ns) and power suffix (S/L), meaning PCB layout reuse is fully supported across these variants without modification.