Renesas 70V07S35G

Overview

70V07S35G from IDT (now Renesas) is a high-speed 32K × 8 true dual-port static RAM with independent left/right ports, 35 ns max access time (industrial grade), 3.3 V ±0.3 V single supply, and on-chip semaphore arbitration logic. It enables simultaneous asynchronous read/write to the same memory location in real-time inter-processor communication systems such as telecom line cards and industrial PLCs.

For engineers reviewing the 70V07S35G datasheet, 70V07S35G pinout, 70V07S35G application, or 70V07S35G equivalent, key selection considerations include BUSY flag timing (tBDD ≤ 40 ns), full standby current (ISB3 = 0.2 mA typ.), Master/Slave configuration via M/S pin, and compatibility with 80-pin TQFP layout for space-constrained embedded designs.

Technical Context

The 70V07S35G implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - no internal clock required. Its on-chip arbitration logic resolves contention using address and chip-enable timing (tAPS = 5 ns setup), not R/W state, enabling deterministic BUSY assertion during simultaneous access to identical addresses.

It integrates two independent power-down domains: CE-controlled active/standby mode per port and SEM-controlled semaphore subsystem enable. The device supports both RAM array access (CE = VIL, SEM = VIH) and 8-bit semaphore flag operations (CE = VIH, SEM = VIL), with dedicated INTL/INTR interrupt flags tied to fixed mailbox addresses 7FFE_H and 7FFF_H.

Key Specifications

Pinout & Package

70V07S35G is available in an 80-pin thin quad flatpack (TQFP) package, body size 14 mm × 14 mm × 1.4 mm, with 0.5 mm pitch. All VCC and GND pins must be connected per datasheet note; unused N/C pins are electrically isolated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AC, 70V07S35G reduces system-level arbitration complexity via on-die semaphores; compared with 70V25L25PFGI, it trades 10 ns speed for guaranteed −40°C to +85°C operation - critical for outdoor infrastructure and factory-floor deployments.

Availability

70V07S35G is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and avionics applications requiring stable component supply, long-term lifecycle assurance, and industrial-grade temperature performance.

Supply support for 70V07S35G 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

Renesas Electronics (formerly Integrated Device Technology) is a global semiconductor leader specializing in microcontrollers, analog, power management, and high-performance memory solutions for industrial, automotive, and communications markets.

The IDT70V07 family was designed specifically for deterministic real-time inter-processor communication, delivering hardware-accelerated arbitration, mailbox interrupts, and low-power dual-port operation in mission-critical embedded systems.

FAQ

What is the operating temperature range for the 70V07S35G?

The 70V07S35G is specified for industrial temperature operation from −40°C to +85°C. This rating is confirmed in the Absolute Maximum Ratings table (TBIAS = −55°C to +125°C) and Recommended DC Operating Conditions, making it suitable for harsh environments like factory floors and outdoor telecom cabinets where the 70V07S35G must maintain 35 ns access timing across the full range.

Does the 70V07S35G support true simultaneous read/write to the same memory address?

Yes, the 70V07S35G implements true dual-ported memory cells that allow simultaneous access - including concurrent read and write - to the same address. This capability is explicitly stated in the Features section and enabled by independent left/right port circuitry, with BUSY arbitration resolving write-write conflicts without data corruption.

How does the Master/Slave configuration work on the 70V07S35G?

The M/S pin configures the 70V07S35G as Master (M/S = VIH) or Slave (M/S = VIL). In Master mode, BUSYL/BUSYR are push-pull outputs indicating contention; in Slave mode, they become inputs that inhibit writes when driven low. This enables scalable width expansion - e.g., two 70V07S35G devices forming a 32K × 16 system with centralized BUSY arbitration.

What are the key differences between the 'S' and 'L' suffixes in the 70V07S35G part number?

The 'S' in 70V07S35G denotes the low-power standby variant: ISB3 (full standby current) is 0.2 mA typical, versus 3 mA for the 'L' version. Both share identical speed (35 ns), voltage (3.3 V), and temperature ratings. The 'S' variant is optimized for battery-backed or energy-sensitive applications where minimizing quiescent power during idle periods is critical for the 70V07S35G.

Can the 70V07S35G be used without enabling the BUSY or semaphore features?

Yes - the 70V07S35G operates as a standard dual-port SRAM without using BUSY or semaphore logic. BUSY pins default to high-impedance when M/S is unconnected or pulled to invalid levels, and semaphores remain inactive unless SEM is asserted. The 70V07S35G retains full 32K × 8 memory functionality, 35 ns access, and low-power modes regardless of optional feature usage.