Renesas 70V261L25PFI

Overview

70V261L25PFI from IDT (Integrated Device Technology) is a high-speed, 3.3V, 16K × 16 true dual-port static RAM with independent left/right ports, 25 ns max access time, industrial temperature range (−40°C to +85°C), and integrated semaphore/INT/BUSY arbitration logic - used in real-time inter-processor communication systems such as telecom line cards and industrial motion controllers.

For engineers reviewing the 70V261L25PFI datasheet, 70V261L25PFI pinout, 70V261L25PFI application, or 70V261L25PFI equivalent, key selection criteria include dual-port contention handling (BUSY/SEM/INT), low standby power (660 µW), TQFP-100 package compatibility, and master/slave cascading for 32-bit+ bus expansion.

Technical Context

The 70V261L25PFI implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves simultaneous accesses via push-pull BUSY outputs (when M/S = VIH) or BUSY inputs (when M/S = VIL), and supports hardware semaphore flags (8 locations, addressed by A0–A2) accessible via dedicated SEM control.

It features independent CE-driven power-down per port, TTL-compatible 3.3V ±0.3V supply, and full support for byte-selectable writes (UBL/LBL) and interrupt flag generation (INTL/INTR at fixed addresses 3FFE_H/3FFF_H) - enabling mailbox-style inter-processor signaling without external logic.

Key Specifications

Pinout & Package

70V261L25PFI 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 not internally bonded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-25BGXI and AS7C316000B-25JCIN, the 70V261L25PFI uniquely integrates all three arbitration primitives (BUSY, SEM, INT) in one TQFP-100 package, reducing total component count by ≥4 and eliminating timing-critical external logic paths.

Availability

70V261L25PFI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, avionics, and medical imaging systems requiring stable component supply, long-lifecycle support, and guaranteed industrial-grade performance.

Supply support for 70V261L25PFI 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 high-performance timing, memory, and interface solutions before its acquisition by Renesas in 2019. It pioneered dual-port SRAM architectures for real-time multiprocessing.

The 70V261L25PFI belongs to IDT's 70V series of high-speed dual-port SRAMs, designed specifically for deterministic inter-processor communication in telecom, industrial control, and defense systems where hardware arbitration eliminates software bottlenecks.

FAQ

What is the maximum operating temperature range for the 70V261L25PFI?

The 70V261L25PFI is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the DC Electrical Characteristics table (Table 05) and applies to all speed grades of the 'L' variant, including the 25 ns version. The device maintains full functionality and timing compliance across this full range without derating.

Does the 70V261L25PFI support true simultaneous read/write to the same memory location?

Yes, the 70V261L25PFI implements true dual-port SRAM cells that allow simultaneous access - including concurrent read and write - to the same memory address. This capability is explicitly stated in the Features section and verified by the Functional Block Diagram and Truth Table I, which define non-contention modes for overlapping operations.

How does the BUSY arbitration work when the 70V261L25PFI is configured as a slave?

When M/S = VIL, the 70V261L25PFI operates as a slave: BUSYL and BUSYR become inputs that internally inhibit writes when driven LOW. This behavior is documented in Note 1 of the Functional Block Diagram and Truth Table IV, where BUSYX inputs gate the write path - ensuring coordinated access in master/slave arrays without external logic.

What is the standby current consumption of the 70V261L25PFI in full standby mode?

In full standby mode (ISB3), with both ports disabled using CMOS-level inputs (CE > VCC − 0.2 V), the 70V261L25PFI consumes 0.2 mA typical (200 µA), or 6 mA maximum - as specified in Table 09. This ultra-low value enables energy-sensitive applications like battery-backed industrial gateways where continuous memory retention is required.

Can the 70V261L25PFI be used without connecting the M/S pin?

No - the M/S pin must be actively driven to either VIH (master) or VIL (slave) to define BUSY pin behavior. Leaving it floating risks undefined arbitration state and potential write corruption. The datasheet specifies M/S as a control input (Table 01), and Figure 3 shows explicit tie-high/tie-low configurations for master/slave operation.