Renesas 70261L25PF

Overview

70261L25PF from IDT (Integrated Device Technology) is a high-speed 16K × 16 true dual-port static RAM with interrupt and semaphore support, operating at 25 ns max access time across industrial temperature range (–40°C to +85°C), powered by single 5V ±10% supply, and packaged in 100-pin TQFP. It enables simultaneous asynchronous read/write access from independent left/right ports - used in real-time interprocessor communication, video frame buffers, and military avionics data exchange.

For engineers reviewing the 70261L25PF datasheet, 70261L25PF pinout, 70261L25PF application, or 70261L25PF equivalent, key selection criteria include dual-port arbitration latency (tBDD ≤ 30 ns), low standby current (ISB3 = 0.2 mA), interrupt mailbox addressing (3FFE/3FFF), and master/slave BUSY flag coordination for 32-bit memory expansion.

Technical Context

The 70261L25PF implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent access without external arbitration logic. Its on-chip hardware supports semaphore signaling via A0–A2-addressed flags and automatic port-to-port conflict resolution using push-pull BUSY outputs.

Interrupt generation is triggered by writes to dedicated mailbox addresses (3FFE for INTL, 3FFF for INTR), with set/reset timing specified as tINS/tINR ≤ 20 ns. The device uses CMOS process technology and features independent CE-controlled power-down per port, achieving ISB3 = 0.2 mA full standby current under CMOS-level inputs.

Key Specifications

Pinout & Package

70261L25PF 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 per layout guidelines; pin 1 marked by corner notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-25BGXI and IDT70V261S25PF, the 70261L25PF uniquely delivers integrated interrupt/mailbox, hardware semaphore, and industrial-temperature BUSY arbitration - eliminating external components and reducing BOM count in safety-critical dual-CPU designs.

Availability

70261L25PF is available at Aetrix Electronics and suitable for real-time interprocessor communication, video frame buffering, and military avionics data exchange requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 70261L25PF 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics since 2019.

The IDT70261 product line was designed specifically for deterministic, low-latency interprocessor communication in dual-CPU architectures - emphasizing hardware arbitration, mailbox interrupts, and seamless 32-bit memory expansion without glue logic.

FAQ

What is the maximum operating temperature range supported by the 70261L25PF?

The 70261L25PF is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "Maximum Operating Temperature and Supply Voltage" table (page 3) and DC Electrical Characteristics tables (pages 5–6) of the official datasheet. The 70261L25PF maintains full functionality-including 25 ns access time, ISB3 = 0.2 mA standby current, and BUSY arbitration timing-across this entire range.

Does the 70261L25PF support true simultaneous access to the same memory location from both ports?

Yes, the 70261L25PF implements true dual-ported memory cells that permit simultaneous read/write access to identical addresses. When contention occurs, on-chip arbitration asserts BUSY on the later-arriving port (per tAPS = 5 ns setup), allowing the first port to complete its cycle. This behavior is documented in Functional Block Diagram (page 1), Truth Table IV (page 15), and Timing Waveform of Write with Port-to-Port Read (page 12).

How does the interrupt function work in the 70261L25PF?

The 70261L25PF interrupt function uses dedicated SRAM addresses: writing to 3FFF (HEX) on the left port asserts INTR; writing to 3FFE (HEX) on the right port asserts INTL. Clearing is performed by reading those same addresses. Timing parameters tINS/tINR ≤ 20 ns are guaranteed. This mechanism is fully described in Functional Description (page 15), Truth Table III (page 14), and Interrupt Timing Waveform (page 14).

What is the standby current consumption of the 70261L25PF in full power-down mode?

In full standby mode (ISB3), where both ports have CE = VIH and all inputs held at CMOS levels (VIN > VCC – 0.2 V or VIN < 0.2 V), the 70261L25PF consumes 0.2 mA typical. This value is explicitly listed in Table 10 (page 5) under "ISB3 Full Standby Current (Both Ports)" for the "L" version at industrial temperature. It reflects deep power-down with all internal circuitry gated.

Can the 70261L25PF be used in a MASTER/SLAVE configuration for 32-bit data bus expansion?

Yes, the 70261L25PF supports MASTER/SLAVE cascading via the M/S pin: MASTER (M/S = H) outputs BUSY; SLAVE (M/S = L) inputs BUSY to inhibit conflicting writes. This enables error-free 32-bit+ word systems without discrete logic, as stated in the Features section (page 1) and Functional Description (page 15). Pin compatibility and timing coordination are guaranteed per datasheet specifications.