Renesas 70P249L90BYGI8

Overview

70P249L90BYGI8 from IDT is a very low-power 4K × 16 (64 Kbit) true dual-port static RAM with independent left/right asynchronous ports, 90 ns ADM-mode access, 60 ns standard SRAM-mode read/write, and industrial-grade operation from −40°C to +85°C. It supports 1.8 V/2.5 V/3.0 V I/O voltages, on-chip port arbitration, BUSY/INT flags, and power supply isolation for wireless handset and embedded control applications.

For engineers reviewing the 70P249L90BYGI8 datasheet, 70P249L90BYGI8 pinout, 70P249L90BYGI8 application, or 70P249L90BYGI8 equivalent, key selection criteria include dual-port arbitration timing (tPS = 5 ns), ultra-low standby current (ISB1 = 2 µA typ. at 1.8 V), 100-ball 0.5 mm BGA package compatibility, and mailbox interrupt support at address FFEh.

Technical Context

This device implements two fully independent, asynchronous memory ports-each configurable as either standard SRAM (separate address/data buses) or time-multiplexed ADM interface (address latched via ADV). The core uses IDT's low-voltage CMOS process, enabling 27 mW active power (typ.) and 3.6 µW standby (typ.) at 1.8 V.

Hardware arbitration logic resolves simultaneous accesses to the same memory location using BUSYL/BUSYR flags and priority timing (tPS = 5 ns), while dedicated Input Read Register (IRR) and Output Drive Register (ODR) provide auxiliary I/O expansion without external logic. Power supply isolation allows independent control of VDD, VDDIOL, and VDDIOR for fine-grained system power management.

Key Specifications

Pinout & Package

70P249L90BYGI8 is housed in a 100-ball 0.5 mm pitch Ball Grid Array (BYG-100) package, 1 mm thick, with balls arranged in a 10×10 grid (A1–K10). Pin functions are asymmetrically distributed between left (L) and right (R) ports, with DNU (Do Not Use) pins explicitly defined for IDT70P249.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-55AXC and IDT70V249L15PF, the 70P249L90BYGI8 uniquely combines 1.8 V operation, 2 µA standby, ADM interface flexibility, and integrated arbitration-making it optimal for space- and power-constrained dual-processor systems where pin count and thermal budget are critical.

Availability

70P249L90BYGI8 is available at Aetrix Electronics and suitable for wireless handset design, industrial PLC I/O modules, and medical imaging data buffering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70P249L90BYGI8 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 timing, memory interface, RF, and high-performance silicon solutions for communications, computing, and industrial markets.

The IDT70P2xxL family was designed specifically for ultra-low-power dual-processor systems requiring deterministic inter-core communication, hardware arbitration, and flexible voltage operation in compact form factors like wireless handsets.

FAQ

What is the maximum supported I/O voltage for 70P249L90BYGI8?

The 70P249L90BYGI8 supports 1.8 V, 2.5 V, and 3.0 V I/O standards on both ports independently. VDDIOL and VDDIOR must each be ≥ VDD and ≤ VDD + 0.3 V (for 3.0 V) or VDD + 0.2 V (for 1.8 V/2.5 V). Exceeding these limits risks permanent damage per Absolute Maximum Ratings table.

How does the BUSY arbitration logic work in 70P249L90BYGI8?

The 70P249L90BYGI8 uses hardware arbitration with 5 ns port setup priority (tPS). When both ports access the same address simultaneously, BUSYL or BUSYR asserts low to stall the later port. Writes to the stalled port are internally gated-no data corruption occurs. The BUSY signal remains active until the first access completes.

Can 70P249L90BYGI8 operate with different I/O voltages on left and right ports?

Yes. The 70P249L90BYGI8 allows independent configuration: VDDIOL sets left-port I/O voltage (1.8 V/2.5 V/3.0 V), and VDDIOR sets right-port I/O voltage. This enables direct interfacing between mismatched logic families (e.g., 1.8 V FPGA ↔ 3.0 V microcontroller) without external level shifters.

What memory address is used for the interrupt mailbox on 70P249L90BYGI8?

For the 70P249L90BYGI8, the left-port interrupt is triggered by a write to address FFEh (hex), and the right-port interrupt is triggered by a write to address FFFh (hex). These are fixed locations per the IDT70P249 family specification-not programmable-and serve as dedicated mailboxes for inter-processor signaling.

Does 70P249L90BYGI8 support both ADM and standard SRAM modes simultaneously?

Yes. The 70P249L90BYGI8 supports independent mode selection per port: MSELL configures the left port, and MSELR configures the right port. One port can operate in ADM mode (time-multiplexed address/data) while the other uses standard SRAM mode (separate address bus), enabling heterogeneous system integration.