Renesas 70V25L35PF8

Overview

70V25L35PF8 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 70V25L35PF8 datasheet, 70V25L35PF8 pinout, 70V25L35PF8 application, or 70V25L35PF8 equivalent, key selection criteria include dual-port timing compatibility, low-power standby current (660 µA typ.), TQFP-100 package footprint, and hardware semaphore support for lock-free synchronization between heterogeneous processors.

Technical Context

This device implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - enabling concurrent read/write operations without external arbitration logic. Its on-chip semaphore logic supports eight dedicated flags accessed via A0–A2, with write-to-read latency of 5 ns and contention window of 5 ns.

The 70V25L35PF8 uses CMOS process technology optimized for 3.3 V operation, delivering 400 mW typical active power and 660 µA typical full-standby current. It supports MASTER/SLAVE cascading for 32-bit+ bus expansion using M/S pin-controlled BUSY flag signaling.

Key Specifications

Pinout & Package

70V25L35PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, JEDEC MO-140 compliant, body size 14 mm × 14 mm × 1.4 mm. All VDD pins require local 3.3 V decoupling; all VSS pins must be connected to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133AXC and AS7C34096B-15TIN, the 70V25L35PF8 uniquely balances 35 ns performance, 660 µA standby current, and full hardware semaphore support - making it optimal for industrial and telecom systems requiring robust, low-power inter-processor communication without added logic.

Availability

70V25L35PF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature range operation.

Supply support for 70V25L35PF8 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 solutions for communications and computing markets.

The IDT70V25 family was designed specifically for high-reliability dual-processor systems requiring deterministic memory sharing, hardware-based synchronization, and industrial-grade thermal performance - targeting telecom, industrial control, and defense applications.

FAQ

What is the maximum operating frequency supported by the 70V25L35PF8?

The 70V25L35PF8 has a 35 ns read cycle time (tRC), which corresponds to a maximum sustained random access rate of 28.6 MHz. This is not a clocked interface - timing is fully asynchronous, so actual throughput depends on address/control signal transition rates and bus protocol overhead. The 70V25L35PF8 does not include an internal clock generator or PLL; all timing is governed by external signal edges meeting AC specifications in the datasheet.

Does the 70V25L35PF8 support true simultaneous read/write to the same memory location?

Yes, the 70V25L35PF8 implements true dual-port SRAM cells that allow simultaneous reads from the same address on both left and right ports. However, simultaneous write-to-write or write-to-read conflict to the same location triggers the BUSY flag and requires external arbitration - the device does not internally resolve data contention. This behavior is explicitly defined in the functional block diagram and truth tables of the official IDT datasheet for 70V25L35PF8.

How is semaphore functionality implemented in the 70V25L35PF8?

The 70V25L35PF8 integrates eight dedicated hardware semaphore flags accessible via I/O0 (write) and all I/O lines (read), addressed by A0–A2. Semaphore mode is activated when SEM = VIL and CE = VIH or UB & LB = VIH. Write-to-read latency is guaranteed at 5 ns (tSWRD), and contention window is 5 ns (tSPS). These parameters are production-tested and documented in the AC Electrical Characteristics table for 70V25L35PF8.

What are the power consumption characteristics of the 70V25L35PF8 in standby mode?

The 70V25L35PF8 delivers 660 µA typical full-standby current (ISB3) when both ports are disabled with CMOS-level inputs (CE > VDD – 0.2 V). This is measured at VDD = 3.3 V and TA = +25°C. In industrial temperature range (–40°C to +85°C), ISB3 remains ≤ 5 mA max per datasheet Table 9b. This ultra-low standby power enables use in battery-backed or energy-harvesting systems where memory retention must persist for extended periods.

Is the 70V25L35PF8 pin-compatible with other members of the IDT70V25/24 family?

Yes, the 70V25L35PF8 shares identical 100-pin TQFP pinout with all IDT70V25/24 variants including 70V25S15PF8, 70V25L20PF8, and 70V24L15JI. Pin assignments for CEL/CER, R/WL/R/WR, OEL/OER, UBL/UBR, LBL/LBR, SEML/SEMR, BUSYL/BUSYR, INTL/INTR, address, and I/O are functionally and physically identical across the family. A12 is no-connect for all 70V25/24 devices, confirming mechanical and electrical compatibility.