Renesas 70261L15PFG

Overview

70261L15PFG from IDT (now Renesas) is a high-speed 16K × 16 true dual-port static RAM with interrupt and semaphore logic, operating at 15 ns max access time (commercial grade), supporting fully asynchronous independent read/write on left and right ports, and used in real-time inter-processor communication systems such as radar signal processors and industrial motion controllers.

For engineers reviewing the 70261L15PFG datasheet, 70261L15PFG pinout, 70261L15PFG application, or 70261L15PFG equivalent, key selection considerations include its 100-pin TQFP package, 5 V ±10% single-supply operation, 1 mW typical standby power, dual-port arbitration timing (tBDD ≤ 18 ns), and interrupt mailbox addressing at 3FFEh/3FFFh.

Technical Context

The 70261L15PFG implements hardware-based port arbitration via push-pull BUSY flags and supports MASTER/SLAVE cascading for 32-bit+ bus expansion using M/S pin control. Its on-chip semaphore logic uses A0–A2 to select among eight shared flags, writable via I/O0 and readable across all 16 I/O lines.

It operates in fully asynchronous mode per port, with separate CE, R/W, OE, UB/LB controls for each side, enabling byte-selective writes and independent power-down per port. The device uses CMOS technology and requires no external logic for contention resolution or interrupt synchronization.

Key Specifications

Pinout & Package

70261L15PFG is housed in a 100-pin TQFP (PNG100) 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 to ensure signal integrity and thermal stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC, 70261L15PFG delivers integrated interrupt/semaphore logic and 5 V compatibility; compared with IDT70V261S15PFGI, it offers 80% lower standby current - critical for always-on edge nodes.

Availability

70261L15PFG is available at Aetrix Electronics and suitable for radar signal processors, industrial motion controllers, and communications protocol bridges requiring stable component supply, long-term obsolescence management, and traceable sourcing from authorized channels.

Supply support for 70261L15PFG 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT70261 product line 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 70261L15PFG?

The 70261L15PFG is rated for commercial temperature operation from 0°C to +70°C. It is not specified for industrial temperature range (−40°C to +85°C); that grade is offered under distinct part numbers such as 70261L20PFGI. Designers requiring extended temperature performance must select the appropriate industrial variant.

Does the 70261L15PFG support true simultaneous access to the same memory address?

Yes, the 70261L15PFG implements true dual-port memory cells that allow concurrent read/write operations to the same address. When contention occurs, on-chip arbitration asserts BUSY on the later-arriving port, ensuring deterministic resolution without data corruption - a core feature confirmed in Functional Block Diagram and Truth Table IV.

How does the interrupt functionality work in the 70261L15PFG?

The 70261L15PFG uses dedicated mailbox addresses: writing to 3FFFh sets INTR (right port flag), writing to 3FFEh sets INTL (left port flag). Reading those addresses clears the respective flag. This hardware-assisted messaging is documented in Truth Table III and Functional Description section, enabling zero-software-overhead inter-processor signaling.

Can the 70261L15PFG be used in a 32-bit data path configuration?

Yes, the 70261L15PFG supports 32-bit expansion via MASTER/SLAVE cascading. When configured as MASTER (M/S = H), BUSY is output; as SLAVE (M/S = L), BUSY is input. Two devices can be synchronized to form a 16K × 32 memory without external logic - explicitly stated in the Features list and Functional Block Diagram notes.

What is the standby power consumption of the 70261L15PFG?

The 70261L15PFG consumes 1 mW typical standby power (ISB3, full standby with CMOS-level inputs), as specified in DC Electrical Characteristics Table 10. This is half the standby draw of the S-variant (5 mW), making it preferred for energy-sensitive applications like portable test gear and always-on industrial gateways.