Renesas 70V07L35G

Overview

70V07L35G 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, 3.3 V single-supply operation, and integrated semaphore/INT/BUSY arbitration logic - used in real-time inter-processor communication systems requiring concurrent memory access without software coordination.

For engineers reviewing the 70V07L35G datasheet, 70V07L35G pinout, 70V07L35G application, or 70V07L35G equivalent, key selection criteria include guaranteed 35 ns industrial-grade timing, sub-1 mA full-standby current (660 µA typ.), master/slave cascading support for 16-bit+ bus expansion, and hardware semaphore flag arbitration across two asynchronous processors.

Technical Context

The 70V07L35G implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - enabling simultaneous read/write to any memory location without internal contention except during true address collision. Its on-chip arbitration logic resolves conflicts via BUSY flag assertion (push-pull, not open-drain) and supports both CE-controlled and address-match-based arbitration modes.

It integrates eight dedicated semaphore registers (addressed by A0–A2), interrupt flags (INTL/INTR tied to fixed addresses 7FFEh/7FFFh), and M/S-selectable master/slave configuration - allowing scalable width expansion without external glue logic. All timing parameters (tRC, tAA, tACE, tBDD) are specified over −40°C to +85°C at VCC = 3.3 V ± 0.3 V.

Key Specifications

Pinout & Package

70V07L35G is available in an 80-pin thin quad flatpack (TQFP), package code PNG80, body size 14 mm × 14 mm × 1.4 mm. All VCC pins require local decoupling; all GND pins must be connected to system ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AC, 70V07L35G delivers integrated arbitration and scalability; compared with 70V25L35PF80G, it offers identical core functionality at lower cost where JTAG and enhanced ESD are not required.

Availability

70V07L35G is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line cards, avionics data concentrators, and DSP-FPGA co-processing systems requiring stable component supply with long-term lifecycle support.

Supply support for 70V07L35G 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The 70V07L35G belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems where hardware arbitration eliminates software-induced latency jitter.

FAQ

What is the maximum operating temperature range for the 70V07L35G?

The 70V07L35G is rated for industrial temperature operation from −40°C to +85°C. This specification is guaranteed across all DC and AC electrical parameters including 35 ns access time, 660 µA standby current, and BUSY arbitration timing - making it suitable for deployment in uncontrolled environmental enclosures such as factory-floor PLCs or outdoor telecom cabinets.

Does the 70V07L35G support true simultaneous read/write to the same memory location?

No - the 70V07L35G does not permit true simultaneous read/write to the same address. When both ports access the same location concurrently, hardware BUSY arbitration asserts the BUSYL or BUSYR flag to stall one port's write operation. Reads remain valid; writes are gated internally until BUSY deasserts. This behavior is documented in Truth Table IV and Timing Waveform drw 11.

How is semaphore functionality implemented in the 70V07L35G?

The 70V07L35G dedicates eight memory-mapped semaphore flags (addressed by A0–A2) within its 32K × 8 array. Access is enabled by asserting SEM = VIL while CE = VIH. Each flag is a binary token that can be atomically written via I/O0 and read across all I/O0–I/O7 lines - enabling lock-free resource sharing between left and right processors without software intervention.

Can the 70V07L35G be used in a master/slave configuration with more than two devices?

Yes - the 70V07L35G supports arbitrary-width expansion using one master (M/S = VIH) and multiple slaves (M/S = VIL). The master's BUSY output drives all slave BUSY inputs in parallel. Address and chip-enable signals must be aligned across all devices; write pulses must respect tAPS setup time (5 ns min) to ensure deterministic arbitration across the entire array.

What is the significance of the 'L' in the 70V07L35G part number?

The 'L' in 70V07L35G denotes the low-power variant of the IDT70V07 family. It specifies 660 µA typical full-standby current (ISB3) versus 3.3 mW for the 'S' variant - achieved via optimized CMOS design without sacrificing 35 ns access speed or industrial temperature rating. The '35' indicates 35 ns maximum access time.