Renesas 70P249L65BYGI

Overview

IDT70P249L65BYGI from Integrated Device Technology is a very low power 4K × 16 (64K-bit) true dual-port static RAM with independent left/right asynchronous ports, 65 ns ADM-mode access, 40 ns standard SRAM-mode access, and industrial temperature support (–40°C to +85°C), used in wireless handset baseband processors for inter-processor mailbox communication.

For engineers reviewing the IDT70P249L65BYGI datasheet, IDT70P249L65BYGI pinout, IDT70P249L65BYGI application, or IDT70P249L65BYGI equivalent, key selection considerations include dual-port arbitration timing (tPS = 5 ns), per-port I/O voltage independence (1.8V/2.5V/3.0V), BUSY/INT flag behavior, and BGA-100 package compatibility with space-constrained RF modules.

Technical Context

The IDT70P249L65BYGI implements fully asynchronous dual-port operation with on-chip arbitration logic that resolves simultaneous accesses to the same address via BUSYL/BUSYR flags and tPS priority setup (5 ns). Each port supports configurable interface modes: time-multiplexed ADM (using ADV, IRR/ODR) or standard SRAM (dedicated A[11:0], I/O[15:0]).

It features independent power domains-VDD (core), VDDIOL (left I/O), and VDDIOR (right I/O)-enabling selective port shutdown without affecting core or other port functionality. The device includes Input Read Register (IRR) at x0000 and Output Drive Register (ODR) with SFEN-controlled activation, plus interrupt mailbox addresses FFE (left) and FFF (right) for inter-processor signaling.

Key Specifications

Pinout & Package

Package: 100-ball 0.5 mm pitch Ball Grid Array (BGA), 1 mm profile, RoHS-compliant green packaging option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV25 and R1EX24002AS, IDT70P249L65BYGI uniquely delivers per-port I/O voltage control, integrated mailbox interrupts, and configurable ADM/SRAM interfaces-enabling lower system BOM cost and reduced firmware complexity in space-constrained, battery-operated dual-processor systems.

Availability

IDT70P249L65BYGI is available at Aetrix Electronics and suitable for wireless handset design, industrial PLC communication buffers, and medical imaging data pipelines requiring stable component supply across extended product lifecycles.

Supply support for IDT70P249L65BYGI 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, and RF power solutions for communications and computing markets.

IDT70P249L65BYGI belongs to the IDT70P2xxL low-power dual-port SRAM family, designed specifically for battery-powered wireless handsets and space-constrained embedded systems requiring hardware-arbitrated shared memory.

FAQ

What is the maximum supported I/O voltage for IDT70P249L65BYGI?

IDT70P249L65BYGI supports 1.8V, 2.5V, and 3.0V I/O standards on both ports independently via VDDIOL and VDDIOR pins. Core voltage VDD must be ≤ the selected I/O voltage. This enables direct interfacing with mixed-voltage SoCs without external level shifters-critical for integrating legacy 3.0V peripherals with modern 1.8V baseband processors.

How does the BUSY arbitration logic work in IDT70P249L65BYGI?

IDT70P249L65BYGI uses hardware arbitration with BUSYL and BUSYR outputs to indicate address collisions. When both ports access the same location, tPS = 5 ns determines priority; the non-priority port's BUSY flag asserts, and its write is internally gated. This prevents data corruption and provides a stall signal for external controllers-eliminating need for software arbitration loops in real-time systems.

What are the mailbox interrupt addresses for IDT70P249L65BYGI?

IDT70P249L65BYGI uses FFE (hex) to set INTL and FFF (hex) to set INTR-per datasheet Note 2 and Truth Table III. Writing to FFE with CSR=OER=VIL clears INTL; reading FFF clears INTR. These fixed addresses provide zero-latency inter-processor signaling without address decoding logic, reducing firmware overhead in dual-CPU architectures.

Can IDT70P249L65BYGI operate with different interface modes on each port?

Yes-IDT70P249L65BYGI supports independent mode selection per port via MSELL and MSELR. One port can use ADM (time-multiplexed address/data) to save pins on resource-constrained controllers, while the other uses standard SRAM mode for high-speed FPGA interfacing. This hybrid configuration is explicitly validated in the functional description and timing diagrams.

What is the significance of the "L" suffix in IDT70P249L65BYGI?

The "L" in IDT70P249L65BYGI denotes the low-power variant of the IDT70P249 family, characterized by 27 mW typical active power and 3.6 µW standby current at 1.8V. It distinguishes this version from higher-power predecessors and confirms compliance with industrial temperature range (–40°C to +85°C) and green packaging requirements specified in the ordering information.