Renesas 70P255L65BYGI8

Overview

70P255L65BYGI8 from IDT is a low-power 8K × 16 (128 Kbit) true dual-port static RAM with independent left ADM and right standard SRAM interfaces, 65 ns max access in ADM mode and 40 ns max in standard mode, 1.8V core supply, and industrial temperature range (−40°C to +85°C), used in real-time inter-processor communication and mailbox-based embedded control systems.

For engineers reviewing the 70P255L65BYGI8 datasheet, 70P255L65BYGI8 pinout, 70P255L65BYGI8 application, or 70P255L65BYGI8 equivalent, key selection considerations include port arbitration timing (tPS = 5 ns), BUSY/INT flag behavior, VDDIOL/VDDIOR voltage independence, ODR/IRR register support, and BGA-100 package compatibility with wireless handset footprints.

Technical Context

The 70P255L65BYGI8 implements asymmetric dual-port architecture: left port uses time-multiplexed address/data (ADM) with ADV latch control, while right port supports configurable standard SRAM interface (MSEL = 0) or ADM (MSEL = 1). Address width is A12–A0 (13-bit), supporting 8K × 16 organization.

On-chip arbitration logic resolves simultaneous access to identical memory locations using BUSYL/BUSYR flags with tBLA/tBHA ≤ 50 ns, and interrupt generation via dedicated mailbox addresses (1FFF_H for INTR, 1FFE_H for INTL). Power isolation allows independent control of VDD, VDDIOL, and VDDIOR.

Key Specifications

Pinout & Package

70P255L65BYGI8 is housed in a 100-ball 0.5 mm pitch BGA (BY-100), 1 mm thick, with DNU (Do Not Use) pins explicitly defined and isolated per datasheet Note 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV25 and R1EX24002AS, the 70P255L65BYGI8 uniquely combines 1.8V core operation, per-port I/O voltage flexibility, hardware mailbox interrupts, and integrated ODR/IRR-making it optimal for battery-powered, safety-critical, or tightly synchronized dual-processor systems.

Availability

70P255L65BYGI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial motion control, and wireless baseband subsystems requiring stable component supply across extended product lifecycles.

Supply support for 70P255L65BYGI8 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 power management ICs, acquired by Renesas in 2019.

The IDT70P2xx family was designed specifically for low-power, high-reliability dual-processor architectures in wireless, industrial, and medical equipment where deterministic latency and hardware-coordinated memory access are critical.

FAQ

What is the memory size and organization of the 70P255L65BYGI8?

The 70P255L65BYGI8 is an 8K × 16 dual-port SRAM, providing 128 Kbits of true dual-access memory with A12–A0 addressing. It belongs to the IDT70P265/255/245 family, where the "255" suffix denotes 8K depth (2¹³ = 8192 words), distinct from 16K (265) and 4K (245) variants. This organization supports efficient mailbox and buffer implementations in embedded multiprocessing systems.

Does the 70P255L65BYGI8 support mixed I/O voltage operation?

Yes, the 70P255L65BYGI8 supports independent I/O voltage domains: VDDIOL powers the left port and VDDIOR powers the right port, each configurable for 1.8V, 2.5V, or 3.0V LVCMOS/LVTTL levels. Core VDD must be ≤ I/O voltage. This enables direct interfacing with heterogeneous processors (e.g., 1.8V FPGA + 3.0V MCU) without level shifters.

How does hardware arbitration work on the 70P255L65BYGI8?

The 70P255L65BYGI8 uses on-chip BUSY logic: when both ports access the same address within tPS = 5 ns setup window, BUSYL or BUSYR asserts low. The port with earlier stable address/enables proceeds; the other is stalled. Writes to the stalled port are internally gated-no data corruption occurs. This eliminates need for external arbitration logic in time-critical systems.

What are the functions of the IRR and ODR registers in the 70P255L65BYGI8?

The Input Read Register (IRR) captures two external binary inputs (e.g., DIP switches) and is read at address x0000 when SFEN = low; the Output Drive Register (ODR) drives five external loads (≤8 mA each) and is written to at x0000 under same condition. Both extend system I/O without additional GPIO expanders, directly supported by 70P255L65BYGI8's internal logic.

Can the 70P255L65BYGI8 operate with only one port active?

Yes-the 70P255L65BYGI8 supports full power isolation: if CSL is high, left port enters standby drawing only 3.6 µW (ISB3), while right port remains fully operational. Similarly, CSR high disables right port. VDDIOL and VDDIOR can also be powered down independently, enabling granular power management in battery-operated devices.