Renesas 70V25L35PF

Overview

70V25L35PF from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 35 ns read cycle time, 3.3 V single-supply operation, and integrated semaphore arbitration logic. It enables simultaneous access to shared memory in real-time inter-processor communication systems such as telecom line cards and industrial PLCs.

For engineers reviewing the 70V25L35PF datasheet, 70V25L35PF pinout, 70V25L35PF application, or 70V25L35PF equivalent, key selection criteria include its 35 ns access time at commercial temperature, low 660 µW standby power, TQFP-100 package compatibility, and full hardware semaphore support for deterministic multi-processor synchronization.

Technical Context

The 70V25L35PF implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, allowing concurrent read/write operations to any memory location without external arbitration. Its on-chip arbitration logic resolves port contention via BUSY flag signaling and supports MASTER/SLAVE cascading for 32-bit+ data bus expansion.

It integrates eight dedicated semaphore flags accessible via A0–A2 addressing and controlled by SEM pins, enabling atomic test-and-set operations across ports. All I/Os are LVTTL-compatible, and power management uses CE-driven automatic power-down into ultra-low standby mode.

Key Specifications

Pinout & Package

70V25L35PF 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 VDD (pins 26, 40, 59, 76) and VSS (pins 25, 39, 58, 75, 85, 95) must be properly decoupled. A12 is No Connect on this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133AXC and IDT70V24L15PF, the 70V25L35PF delivers optimal balance of 35 ns access latency, ultra-low 660 µW standby, and proven interoperability in commercial-grade inter-processor systems - making it ideal for cost-sensitive, power-aware designs where extreme speed is unnecessary.

Availability

70V25L35PF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, medical imaging, and avionics applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for 70V25L35PF 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, RF, and sensor signal conditioning ICs for communications, computing, and industrial markets.

The IDT70V25 family was designed specifically for high-reliability, low-latency inter-processor communication in commercial-grade embedded systems - emphasizing deterministic arbitration, LVTTL compatibility, and ultra-low standby power.

FAQ

What is the maximum operating frequency supported by the 70V25L35PF?

The 70V25L35PF supports a maximum read cycle rate of 28.6 MHz, derived from its 35 ns read cycle time (tRC). This is not a clocked device - it operates asynchronously, so timing depends on control signal setup/hold and propagation delays rather than a fixed clock. For reliable operation, all address and control transitions must meet the specified AC timing parameters including tAA (35 ns), tACE (35 ns), and tAOE (20 ns).

Does the 70V25L35PF support true simultaneous read operations from both ports to the same memory address?

Yes, the 70V25L35PF implements true dual-port SRAM cells that allow concurrent reads from both left and right ports to the exact same memory location without contention or data corruption. This capability is fundamental to its architecture and is explicitly confirmed in the datasheet's "Features" section under "True Dual-Ported memory cells which allow simultaneous reads of the same memory location."

How does the semaphore functionality work on the 70V25L35PF?

The 70V25L35PF includes eight dedicated hardware semaphore flags accessed via A0–A2 addressing and controlled by the SEML/SEMR pins. When SEM is asserted low, the device enters semaphore mode: writing to I/O0 sets the flag, and reading returns its state across all I/O lines (I/O0–I/O15). This enables atomic test-and-set operations critical for deadlock-free multi-processor synchronization without software overhead.

Is the 70V25L35PF pin-compatible with other members of the IDT70V25/24 family?

Yes, the 70V25L35PF shares identical pinout and package (100-pin TQFP) with all IDT70V25/24 variants including IDT70V24L15PF and IDT70V25L15PF. Pin functions, power/ground locations, and control signal assignments are fully consistent across the family - enabling direct substitution where timing and power requirements align, as confirmed in the "Pin Configurations" section of the datasheet.

What is the purpose of the M/S pin on the 70V25L35PF?

The M/S (Master/Slave Select) pin configures the 70V25L35PF's role in cascaded dual-port systems: when driven high (VIH), BUSY becomes an output flag indicating local port contention; when driven low (VIL), BUSY becomes an input that accepts the BUSY signal from a master device. This enables hierarchical arbitration across multiple devices for expanding data bus width beyond 16 bits without external logic.