Renesas 70V261L25PF8

Overview

70V261L25PF8 from IDT (now Renesas) is a high-speed, 3.3V, 16K × 16 (256 Kbit) true dual-port static RAM with independent left/right ports, on-chip semaphore logic, interrupt flag support, and 25 ns max access time. It enables simultaneous asynchronous read/write to the same memory location and supports master/slave cascading for 32-bit+ bus expansion in real-time inter-processor communication systems.

For engineers reviewing the 70V261L25PF8 datasheet, 70V261L25PF8 pinout, 70V261L25PF8 application, or 70V261L25PF8 equivalent, key selection criteria include dual-port arbitration timing (tBAA ≤ 25 ns), ultra-low standby current (660 µW typ.), industrial temperature range (–40°C to +85°C), and TTL-compatible 3.3V ±0.3V operation - all verified for this specific L-grade, 25 ns, TQFP-packaged variant.

Technical Context

This device implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port. Its hardware arbitration uses chip enable (CEL/CER) and address match detection (A0–A13) to assert BUSY flags without requiring external logic.

On-chip semaphore logic provides eight binary flags accessible via A0–A2, with dedicated SEM pins and write-to-I/O0/read-from-all-I/O protocol. Interrupt signaling operates at fixed addresses (3FFE_H/3FFF_H) with push-pull INTL/INTR outputs and no external pull-ups required.

Key Specifications

Pinout & Package

70V261L25PF8 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 VCC and GND pins must be connected; NC pins are internally unconnected and must not be tied.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV25 and AS7C3256B-25JCIN, the 70V261L25PF8 delivers integrated hardware arbitration, semaphore logic, and interrupt signaling in a single 100-pin TQFP - reducing BOM count, PCB area, and firmware complexity for real-time inter-processor communication.

Availability

70V261L25PF8 is available at Aetrix Electronics and suitable for industrial PLC communication hubs, avionics flight control data exchange, and medical imaging real-time frame buffers requiring stable component supply across extended product lifecycles.

Supply support for 70V261L25PF8 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 70V261L25PF8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems requiring hardware-enforced resource sharing.

FAQ

What is the operating temperature range certified for the 70V261L25PF8?

70V261L25PF8 is qualified for industrial temperature operation from –40°C to +85°C. This rating is explicitly confirmed in the DC Electrical Characteristics table (3040 tbl 05) and applies to the "L" speed grade with 25 ns access time. No derating is required within this range, and thermal performance is validated per IDT specification 6.42.

Does the 70V261L25PF8 require external pull-up resistors on BUSY or interrupt pins?

No. The 70V261L25PF8 features push-pull BUSYL/BUSYR and INTL/INTR outputs, as stated in Note 2 of the Functional Block Diagram and Truth Table IV. These outputs drive actively high or low without external biasing - eliminating need for pull-up resistors and simplifying layout in noise-sensitive applications.

How does the 70V261L25PF8 handle simultaneous access to the same memory address?

When both ports access the same address, the 70V261L25PF8 uses hardware arbitration to assert BUSY on the later-arriving port. In master mode (M/S = VIH), BUSY disables writes on the delayed port; in slave mode (M/S = VIL), BUSY acts as a write-inhibit input. Timing parameters tBAA (≤25 ns) and tAPS (5 ns) guarantee deterministic resolution.

Can the 70V261L25PF8 be used in a 32-bit data path configuration?

Yes. The 70V261L25PF8 supports width expansion via Master/Slave cascading: one device configured as master (M/S = VIH) drives BUSY outputs, while others as slaves (M/S = VIL) accept BUSY as write-inhibit inputs. This enables error-free 32-bit-or-wider word systems without external glue logic, as described in the Functional Description section.

What is the standby current consumption of the 70V261L25PF8 under full-power-down conditions?

The 70V261L25PF8 achieves 660 µW typical standby power (ISB3) when both CEL and CER are high, all inputs held at CMOS levels (> VCC – 0.2 V or < 0.2 V), and SEM pins high - per DC Electrical Characteristics table 3040 tbl 09. This ultra-low value is specific to the "L" (low-power) variant and distinguishes it from the "S" (standard) version (3.3 mW typ).