Renesas 70261L15PF

Overview

IDT70261L15PF from IDT (now Renesas) is a high-speed 16K × 16 true dual-port static RAM with interrupt and semaphore logic, designed for real-time inter-processor communication in embedded systems. It supports simultaneous asynchronous access to the same memory location from left and right ports, features 15 ns max read cycle time (commercial grade), 1 mW typical standby power, and operates on a single 5 V ±10% supply. It is used in industrial motion controllers requiring deterministic data exchange between two independent CPUs.

For engineers reviewing the IDT70261L15PF datasheet, IDT70261L15PF pinout, IDT70261L15PF application, or IDT70261L15PF equivalent, key selection criteria include port arbitration timing (tAPS = 5 ns), BUSY flag behavior under address contention, interrupt mailbox addressing (3FFE/3FFF), and low-power standby current (1 µA typ. ISB3).

Technical Context

The IDT70261L15PF implements full hardware port arbitration using push-pull BUSY outputs and master/slave select (M/S) configuration - when M/S = H, BUSY is output; when M/S = L, BUSY is input. It integrates on-chip semaphore logic with eight flags addressed via A0–A2 and written via I/O0, enabling mutual exclusion without external logic.

Interrupt signaling uses dedicated mailbox addresses: INTL asserts when right port writes to 3FFE_H; INTR asserts when left port writes to 3FFF_H. Both ports support independent byte enables (UBL/LBL, UBR/LBR) and fully asynchronous operation, with CE-controlled automatic power-down per port.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm. All VCC and GND pins must be connected per datasheet note 1 and 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1371D-133AXC and R1EX24064ASAS, the IDT70261L15PF uniquely delivers integrated hardware arbitration, mailbox interrupts, and semaphore logic in a single 100-pin package - eliminating external glue logic and reducing BOM count by ≥3 components in safety-critical dual-CPU designs.

Availability

IDT70261L15PF is available at Aetrix Electronics and suitable for industrial motion controllers, redundant safety PLCs, real-time data acquisition systems, and avionics display interfaces requiring stable component supply across extended product lifecycles.

Supply support for IDT70261L15PF 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

Renesas Electronics Corporation (formerly Integrated Device Technology) is a global semiconductor leader specializing in microcontrollers, analog, power management, and memory solutions for industrial, automotive, and infrastructure markets.

The IDT70261L15PF belongs to the IDT70261 family of high-speed dual-port SRAMs, engineered specifically for deterministic inter-processor communication in hard real-time embedded systems where hardware-enforced synchronization is mandatory.

FAQ

What is the maximum operating temperature range for the IDT70261L15PF?

The IDT70261L15PF is rated for commercial temperature operation from 0°C to +70°C. It is not qualified for industrial temperature range (−40°C to +85°C); that grade is available only in the IDT70261L20PF variant. This specification is confirmed in Table 2 of the July 2019 datasheet DSC 3039/13, which explicitly lists "70261X15" as "Com'l Only".

Does the IDT70261L15PF support true simultaneous read/write to the same memory address?

Yes, the IDT70261L15PF implements true dual-ported memory cells that allow simultaneous access - including concurrent read and write - to the same address location. When contention occurs, on-chip arbitration logic asserts the BUSY flag to stall one port, ensuring data integrity. This behavior is documented in the Functional Block Diagram and Truth Table IV (Address BUSY Arbitration) of the IDT70261L15PF datasheet.

How is interrupt generation configured for the IDT70261L15PF?

Interrupt generation in the IDT70261L15PF is hardwired to two specific addresses: writing to 3FFF_H sets the right-port interrupt flag (INTR), and writing to 3FFE_H sets the left-port flag (INTL). Clearing is performed by reading those same addresses. This mailbox mechanism is detailed in Truth Table III (Interrupt Flag) and the Functional Description section of the IDT70261L15PF datasheet.

What is the standby current consumption of the IDT70261L15PF in full CMOS standby mode?

In full CMOS standby mode (ISB3), the IDT70261L15PF consumes 0.2 mA typical and 5 µA maximum current. This condition requires both chip enables (CEL and CER) held above VCC − 0.2 V, all inputs at valid CMOS levels, and SEMR/SEML > VCC − 0.2 V. These values are specified in Table 10 (DC Electrical Characteristics) of the IDT70261L15PF datasheet.

Can the IDT70261L15PF be used in a MASTER/SLAVE configuration for 32-bit data bus expansion?

Yes, the IDT70261L15PF supports MASTER/SLAVE cascading to expand data bus width to 32 bits or more. The M/S pin configures BUSY as output (MASTER) or input (SLAVE), enabling automatic port arbitration across multiple devices. This architecture is described in the Features section and Figure 1 (Functional Block Diagram) of the IDT70261L15PF datasheet, and eliminates need for external logic in wide-memory systems.