Renesas 70V25S35PFG

Overview

70V25S35PFG from Integrated Device Technology is a high-speed 3.3V 4K x 16 true dual-port static RAM with independent left/right ports, 35 ns max read cycle time (commercial grade), 400 mW typical active power, and on-chip semaphore arbitration logic - used in real-time inter-processor communication systems requiring simultaneous non-blocking memory access.

For engineers reviewing the 70V25S35PFG datasheet, 70V25S35PFG pinout, 70V25S35PFG application, or 70V25S35PFG equivalent, key selection criteria include dual-port timing compatibility, 100-pin TQFP footprint, 3.3V-only supply, industrial-grade standby current (660 µA typ.), and semaphore flag coherency across ports.

Technical Context

This device implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling concurrent reads/writes to the same memory location without contention. It integrates hardware semaphore logic for eight shared flags addressed via A0–A2, with dedicated SEM, INT, and BUSY signaling for master/slave coordination.

The architecture supports cascaded master/slave configurations to expand data width beyond 16 bits, using M/S pin to configure BUSY as output (master) or input (slave). All control signals - CE, R/W, OE, UB/LB - are TTL-compatible with 3.3V ±0.3V supply, and internal power-down is triggered by CE high.

Key Specifications

Pinout & Package

70V25S35PFG is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, 14 mm × 14 mm body, and exposed thermal pad (not electrically connected). Pin assignments follow standard IDT dual-port layout with mirrored left/right port groups and dedicated arbitration signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-35AXC, 70V25S35PFG provides native master/slave expansion and consistent BUSY flag behavior; versus IDT70V24L15PF, it trades 20 ns slower access for broader commercial temperature support and higher noise immunity at 35 ns timing.

Availability

70V25S35PFG is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, and industrial PLC I/O data exchange requiring stable component supply across extended product lifecycles.

Supply support for 70V25S35PFG 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, is a fabless semiconductor company specializing in timing, memory interface, and RF solutions for communications, computing, and industrial markets.

The IDT70V25 family delivers high-speed dual-port SRAMs optimized for deterministic, low-latency inter-processor communication in mission-critical embedded systems where software-managed memory coherency is insufficient.

FAQ

What is the maximum operating frequency supported by the 70V25S35PFG?

The 70V25S35PFG supports a maximum read cycle time of 35 ns, corresponding to a theoretical maximum sustained read frequency of 28.6 MHz. This value is specified for commercial temperature range (0°C to +70°C) with VDD = 3.3 V ±0.3 V and all AC test conditions met. The device is asynchronous and does not use an internal clock, so actual system throughput depends on external controller timing margins and bus loading.

Does the 70V25S35PFG support true simultaneous read/write operations on both ports?

Yes, the 70V25S35PFG implements true dual-port SRAM architecture allowing independent, fully asynchronous read or write operations on the left and right ports - including simultaneous access to the same memory address. Hardware arbitration resolves contention via BUSY flag assertion, and on-chip semaphore logic ensures atomic flag updates without external logic.

What is the function of the M/S pin on the 70V25S35PFG?

The M/S (Master/Slave) pin configures BUSY behavior: when driven high (VIH), BUSYL/BUSYR become outputs indicating local port contention; when driven low (VIL), they become inputs accepting BUSY signals from another device in a cascaded master/slave configuration. This enables seamless expansion to 32-bit or wider data buses without external arbitration circuitry.

Can the 70V25S35PFG operate with a 2.5V supply?

No, the 70V25S35PFG is specified exclusively for 3.3 V ±0.3 V operation. Its DC and AC characteristics - including VIH/VIL thresholds, output drive strength, and timing parameters - are characterized only across VDD = 3.0 V to 3.6 V. Operation outside this range may cause functional failure, data corruption, or accelerated wear and is not guaranteed by IDT.

How many semaphore flags does the 70V25S35PFG provide, and how are they accessed?

The 70V25S35PFG provides eight hardware semaphore flags, addressed via A0–A2 during semaphore mode. Access is enabled by setting SEM = VIL while holding CE = VIH or UB = LB = VIH. Each flag is readable on all I/O pins (I/O0–I/O15) and writable via I/O0, supporting atomic set/clear operations essential for inter-processor synchronization in the 70V25S35PFG.