Renesas 70V261S35PFG

Overview

70V261S35PFG from IDT is a high-speed 3.3V 16K × 16 true dual-port static RAM with independent left/right ports, 35 ns max access time, on-chip semaphore and interrupt logic, and master/slave arbitration-designed for real-time inter-processor communication in telecom switching fabric and industrial motion controllers.

For engineers reviewing the 70V261S35PFG datasheet, 70V261S35PFG pinout, 70V261S35PFG application, or 70V261S35PFG equivalent, this device supports simultaneous asynchronous read/write to shared memory locations, hardware BUSY flag arbitration, byte-selectable I/O, and TTL-compatible 3.3V operation with industrial temperature range support.

Technical Context

The 70V261S35PFG implements fully asynchronous dual-port architecture with separate address, control, and data buses per port-enabling concurrent access without internal synchronization overhead. It integrates dedicated semaphore registers (8 flags, addressed via A0–A2), interrupt mailbox logic (INTL/INTR at 3FFEh/3FFFh), and push-pull BUSY outputs that assert on address collision.

Arbitration is hardware-based and triggered solely by CE and address match timing (tAPS = 5 ns min); M/S pin configures BUSY as output (master) or input (slave). Semaphore access requires CE = VIH and SEM = VIL, while RAM access requires CE = VIL and SEM = VIH-ensuring strict mode separation.

Key Specifications

Pinout & Package

70V261S35PFG is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be connected per layout guidelines; N/C pins are internally unconnected and must remain floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-250BZXI and AS7C3316PFS-25TIN, the 70V261S35PFG delivers integrated hardware arbitration and signaling at 35 ns speed-reducing BOM count and eliminating timing-critical glue logic in deterministic embedded systems.

Availability

70V261S35PFG is available at Aetrix Electronics and suitable for telecom switching fabric, industrial motion controllers, avionics data concentrators, and medical imaging subsystems requiring stable component supply with long-term industrial-grade availability.

Supply support for 70V261S35PFG 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) is a fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V261S35PFG belongs to IDT's high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems requiring hardware-enforced memory coherency.

FAQ

What is the maximum operating temperature range supported by the 70V261S35PFG?

The 70V261S35PFG is rated for industrial temperature operation from −40°C to +85°C, with all AC and DC specifications guaranteed across this full range. This makes it suitable for deployment in harsh environments such as factory automation controllers and outdoor telecom equipment where ambient thermal stress is significant.

How does the BUSY arbitration logic function in master versus slave configuration for the 70V261S35PFG?

In master mode (M/S = VIH), the 70V261S35PFG asserts BUSYL/BUSYR as push-pull outputs when address collisions occur-stalling conflicting writes. In slave mode (M/S = VIL), BUSYL/BUSYR become inputs that directly inhibit writes when driven LOW, enabling hierarchical arbitration in cascaded arrays without external logic.

Can the 70V261S35PFG support 32-bit data bus expansion, and how is it implemented?

Yes-the 70V261S35PFG supports 32-bit expansion via its Master/Slave select (M/S) pin. One device operates as master to generate BUSY arbitration signals, while additional devices operate as slaves using BUSY as write-inhibit inputs. This eliminates need for external AND gates and maintains full-speed operation across the expanded bus.

What are the valid address ranges for interrupt mailbox functionality in the 70V261S35PFG?

The 70V261S35PFG uses fixed addresses 3FFEh (hex) for left-port interrupt flag (INTL) and 3FFFh (hex) for right-port interrupt flag (INTR). Writing to these locations with appropriate CE/R/W conditions asserts the corresponding flag; reading clears it-enabling hardware-triggered, zero-latency inter-processor signaling.

Does the 70V261S35PFG require external pull-up resistors on BUSY or interrupt pins?

No-the 70V261S35PFG features push-pull BUSY and interrupt outputs (INTL/INTR) that do not require external pull-up resistors. This simplifies board design and ensures robust signal drive across temperature and voltage variations, unlike open-drain alternatives that mandate external biasing.