Renesas 70261S25PF

Overview

70261S25PF from IDT is a high-speed 16K × 16 true dual-port static RAM with interrupt and semaphore logic, operating at 25 ns max access time (industrial/commercial), supporting independent asynchronous reads/writes on left and right ports, and enabling mailbox-style inter-processor communication in real-time embedded systems.

For engineers reviewing the 70261S25PF datasheet, 70261S25PF pinout, 70261S25PF application, or 70261S25PF equivalent, key selection considerations include its 100-pin TQFP package, 5 V ±10% single-supply operation, BUSY/INT flag timing (tINS/tINR ≤ 20 ns), on-chip arbitration, and support for MASTER/SLAVE cascading to expand data width beyond 32 bits.

Technical Context

The 70261S25PF implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous access to any memory location without external logic. Its on-chip arbitration resolves contention via BUSY flag assertion (tBAA ≤ 20 ns) and supports priority-based resolution using tAPS = 5 ns setup time.

It integrates dedicated interrupt generation (INTL/INTR) triggered by writes to fixed addresses (3FFE_H/3FFF_H) and eight hardware semaphores accessed via A0–A2 with CE = VIH/SEM = VIL, all implemented in CMOS for 750 mW typical active power and 1 mW/5 mW standby depending on S/L variant.

Key Specifications

Pinout & Package

70261S25PF is housed in a 100-pin TQFP (PNG100) package with 0.5 mm pitch, 14 mm × 14 mm body size, and exposed thermal pad (per IDT documentation). All VCC and GND pins must be individually 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 CY7C1362BV25 and IS61WV102416BLL-25MLI, the 70261S25PF uniquely integrates BUSY arbitration, mailbox-style interrupts, and eight hardware semaphores - reducing BOM count and firmware complexity in real-time multi-processor systems.

Availability

70261S25PF is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, avionics health monitors, and DSP-FPGA co-processing platforms requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70261S25PF 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 high-performance computing solutions, now part of Renesas Electronics.

The IDT70261 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, interrupt signaling, and seamless bus-width scalability.

FAQ

What is the maximum operating temperature range for the 70261S25PF?

The 70261S25PF is rated for industrial operation from –40°C to +85°C, making it suitable for deployment in harsh environments such as factory automation controllers, outdoor telecom equipment, and transportation electronics where ambient thermal stability cannot be guaranteed.

Does the 70261S25PF support true simultaneous read/write operations on both ports?

Yes, the 70261S25PF implements true dual-port architecture allowing independent, fully asynchronous read or write access to any memory location from left and right ports simultaneously - provided no address contention occurs; BUSY logic handles collisions deterministically.

How does the interrupt function work in the 70261S25PF?

The 70261S25PF asserts INTL when the right port writes to address 3FFE_H, and INTR when the left port writes to 3FFF_H. These flags remain active until cleared by a read (INTR) or write (INTL) to the same address - enabling mailbox-style inter-processor signaling without polling.

Can the 70261S25PF be used in a 32-bit data path configuration?

Yes, the 70261S25PF supports MASTER/SLAVE cascading via the M/S pin: one device configured as MASTER (M/S = H) drives BUSY output, while others as SLAVE (M/S = L) accept BUSY input - enabling error-free 32-bit+ word systems without external logic.

What is the standby current consumption of the 70261S25PF?

The 70261S25PF (L variant) consumes 0.2 mA typical full-standby current (ISB3) when both ports are disabled with CMOS-level inputs, significantly reducing power in idle states compared to the S variant's 1.0 mA - critical for energy-constrained industrial gateways.