Renesas 70V261L25PF

Overview

70V261L25PF from IDT is a high-speed 3.3V 16K × 16 true dual-port static RAM with independent left/right ports, 25 ns max access time, on-chip semaphore logic, interrupt flag support, and master/slave arbitration-designed for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 70V261L25PF datasheet, 70V261L25PF pinout, 70V261L25PF application, or 70V261L25PF equivalent, key selection criteria include dual-port contention handling (BUSY/SEM/INT), low-power standby (660 µW), TQFP-100 packaging, industrial temperature range (–40°C to +85°C), and byte-selectable I/O for multiplexed bus compatibility.

Technical Context

The 70V261L25PF implements fully asynchronous dual-port operation with separate address, control, and data buses per port-enabling simultaneous read/write to the same memory location only when semaphore or BUSY arbitration resolves contention. Its hardware arbitration logic uses chip enable (CEL/CER) and address match detection-not R/W state-to assert BUSY flags.

It integrates three coexisting coordination mechanisms: (1) push-pull BUSY outputs (or inputs in slave mode) for real-time write inhibition; (2) eight dedicated semaphore registers (A0–A2 addressed) accessible via SEM = VIL; and (3) dedicated interrupt mailbox addresses (3FFE_H/3FFF_H) with INTL/INTR flags asserted on cross-port writes.

Key Specifications

Pinout & Package

70V261L25PF 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; N/C pins are internally unconnected and must remain floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C026V-25AXC and AS7C316000B-25JIN, the 70V261L25PF uniquely integrates all three coordination primitives (BUSY, SEM, INT) in one package-reducing PCB area, eliminating external components, and guaranteeing deterministic timing for safety-critical inter-processor communication.

Availability

70V261L25PF is available at Aetrix Electronics and suitable for industrial PLCs, avionics data links, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V261L25PF 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 high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.

The 70V261L25PF belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where hardware arbitration eliminates software overhead and timing uncertainty.

FAQ

What is the maximum operating temperature range for the 70V261L25PF?

The 70V261L25PF is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including access time (25 ns max), standby current (660 µW typ.), and BUSY/INT timing margins-ensuring reliable performance in harsh environments without thermal derating.

How does the 70V261L25PF handle simultaneous access to the same memory location?

The 70V261L25PF uses hardware arbitration: when both ports attempt access to the same address, the BUSY logic asserts BUSYL/BUSYR based on chip enable and address match timing-not R/W state. In master mode, this blocks the later-accessing port's write; in slave mode, BUSY acts as an external write-inhibit input. Semaphores provide software-managed coordination for non-conflicting regions.

What is the function of the M/S pin on the 70V261L25PF?

The M/S pin configures the 70V261L25PF as either master (M/S = VIH) or slave (M/S = VIL). In master mode, BUSYL/BUSYR are push-pull outputs indicating contention; in slave mode, they become write-inhibit inputs. This enables scalable width expansion: one master arbitrates, multiple slaves obey its BUSY signal-preventing split decisions in multi-chip arrays.

Can the 70V261L25PF operate with only one port active?

Yes. The 70V261L25PF supports independent port power management: setting CEL = VIH disables the left port (reducing ICC to ISB2 or ISB4 levels), while CER = VIH disables the right port. Full standby (ISB3 = 0.2 mA typ.) occurs when both CE pins are high and all inputs are at rail extremes-ideal for dynamic power scaling in asymmetric workloads.

What are the valid interrupt mailbox addresses for the 70V261L25PF?

The 70V261L25PF uses fixed interrupt mailbox addresses: writing to address 3FFE_H asserts INTL (left-port interrupt), and writing to 3FFF_H asserts INTR (right-port interrupt). Clearing is performed by reading those same addresses-e.g., reading 3FFF_H clears INTR. These locations reside within the main memory array and retain user-defined 16-bit data.