Renesas 70261L20PF

Overview

70261L20PF from IDT (Integrated Device Technology) is a high-speed 16K × 16 true dual-port static RAM with interrupt and semaphore logic, operating at 20 ns max access time over 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 systems.

For engineers reviewing the 70261L20PF datasheet, 70261L20PF pinout, 70261L20PF application, or 70261L20PF equivalent, key selection criteria include its 20 ns industrial-grade access timing, 1 mW standby power, on-chip port arbitration, BUSY/INT flag signaling, and master/slave cascading capability for 32-bit+ memory expansion.

Technical Context

The 70261L20PF implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves contention via BUSY flag assertion when both ports access the same memory location, with priority determined by input stability timing (tAPS = 5 ns).

It integrates dedicated semaphore registers (8 flags, addressed by A0–A2) accessible via CE = VIH / SEM = VIL mode, and supports interrupt generation via mailbox addresses 3FFE_H (left port INTL) and 3FFF_H (right port INTR), with tINS/tINR ≤ 20 ns. All I/Os are TTL-compatible with push-pull BUSY/INT outputs.

Key Specifications

Pinout & Package

70261L20PF is housed in a 100-pin TQFP (Thin Quad Flatpack) package with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be externally decoupled per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-200BZXI and IDT70V261S20PF, the 70261L20PF uniquely delivers industrial-temperature operation, integrated interrupt/mailbox logic, and 1 mW standby power - making it optimal for deterministic, low-power, mission-critical embedded systems where hardware synchronization reduces firmware complexity and failure modes.

Availability

70261L20PF is available at Aetrix Electronics and suitable for radar signal processing, industrial PLC communication, aerospace avionics data bus, and digital video frame buffer applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70261L20PF 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019. It pioneered high-performance dual-port memory architectures for real-time systems.

The IDT70261 product line was engineered for deterministic interprocessor communication in safety-critical embedded systems - emphasizing hardware arbitration, low-latency interrupts, and industrial reliability over raw bandwidth.

FAQ

What is the maximum access time specification for the 70261L20PF?

The 70261L20PF has a maximum address access time (tAA) of 20 ns over the full industrial temperature range (−40°C to +85°C) and 5.0 V ±10% supply. This value is production-tested and guaranteed, enabling predictable timing in hard real-time applications such as radar pulse processing and avionics control loops.

Does the 70261L20PF support true simultaneous read/write to the same memory location?

Yes - the 70261L20PF implements true dual-ported memory cells that allow concurrent access to identical addresses. When contention occurs, on-chip arbitration asserts BUSY on the lower-priority port, permitting the higher-priority access to complete while stalling the other - preserving data integrity without external logic.

How does the interrupt functionality work on the 70261L20PF?

The 70261L20PF uses dedicated mailbox addresses: writing to 3FFF_H on the left port sets the right port's INTR flag, and writing to 3FFE_H on the right port sets the left port's INTL flag. Interrupt reset occurs via read (for INTR) or read with OEL/OER active (for INTL), with tINS/tINR ≤ 20 ns - enabling sub-25 ns event signaling.

What is the standby power consumption of the 70261L20PF?

In full CMOS standby mode (ISB3), the 70261L20PF draws just 0.2 mA typical (≤5 µA max) with all inputs held at rails and both chip enables deasserted. This ultra-low quiescent current supports battery-backed operation in industrial controllers and portable test equipment where energy efficiency is critical.

Can multiple 70261L20PF devices be cascaded for wider data paths?

Yes - the 70261L20PF supports master/slave configuration via the M/S pin. When configured as master (M/S = H), BUSY is an output; as slave (M/S = L), BUSY is an input. This enables seamless 32-bit or wider memory expansion using IDT's proprietary cascading scheme without additional discrete logic or timing penalties.