Renesas R5F61665N50FPV

Overview

R5F61665N50FPV from Renesas Electronics is a 32-bit CISC microcontroller in the H8SX/1665 Group, featuring a 50 MHz maximum CPU clock, 512 KB on-chip Flash memory, and integrated peripherals including TPU, SCI, WDT, and DTC. It operates from a 3.0–3.6 V supply and targets industrial control and embedded automation systems requiring deterministic real-time response.

For engineers reviewing the R5F61665N50FPV datasheet, R5F61665N50FPV pinout, R5F61665N50FPV application, or R5F61665N50FPV equivalent, key selection criteria include its 144-pin LQFP package, 50 MHz core speed, 512 KB Flash with 32 KB RAM, dual voltage domains (VCC/VCCIO), and support for external bus expansion via BSC - all critical for motor control, PLC I/O modules, and protocol gateway designs.

Technical Context

The R5F61665N50FPV implements the H8SX CPU core with three operating modes (Normal, Middle, Advanced) and supports up to 50 MHz operation using an internal PLL derived from an external crystal or oscillator. Its Bus State Controller (BSC) enables direct connection to external SRAM, Flash, or peripherals at configurable wait states and bus widths (8/16/32-bit).

Peripherals include a 16-bit Timer Pulse Unit (TPU) with 16 channels, four Serial Communications Interfaces (SCI) supporting asynchronous and clock-synchronous modes, a Data Transfer Controller (DTC) for autonomous memory-to-peripheral transfers, and a Watchdog Timer (WDT) with independent clock source and windowed timeout capability.

Key Specifications

Pinout & Package

Package: 144-pin LQFP (20 mm × 20 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level (MSL) 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with R5F61665N50FPV-G, the base part lacks formal High Quality grade certification but meets Standard-grade requirements for industrial automation; compared with R5F61667N50FPV, it trades USB and doubled Flash for lower cost and unchanged peripheral set - making it optimal for cost-sensitive, non-USB embedded controllers.

Availability

R5F61665N50FPV is available at Aetrix Electronics and suitable for industrial motor control, PLC I/O modules, protocol gateways, and embedded HMI controllers requiring stable component supply across multi-year production cycles.

Supply support for R5F61665N50FPV 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 is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The H8SX/1665 Group, including R5F61665N50FPV, was designed for deterministic real-time embedded control in industrial automation, motion control, and protocol-convergent edge devices - emphasizing peripheral integration, bus expandability, and long-lifecycle support.

FAQ

What is the maximum operating frequency of the R5F61665N50FPV?

The R5F61665N50FPV supports a maximum CPU clock frequency of 50 MHz, achieved via its internal PLL circuit that multiplies an external crystal or oscillator input (1–20 MHz). This frequency is specified under recommended operating conditions of 3.0–3.6 V supply and ambient temperature range –40°C to +85°C. The R5F61665N50FPV maintains timing compliance across this range when configured per the Hardware Manual Rev. 2.00.

Does the R5F61665N50FPV support external memory expansion?

Yes, the R5F61665N50FPV integrates a Bus State Controller (BSC) that supports external memory expansion with 8-bit, 16-bit, or 32-bit data bus widths and up to 16 MB address space. It provides programmable wait-state control, chip-select mapping, and burst-mode capability - enabling direct connection to SRAM, NOR Flash, or FPGA peripherals without external glue logic. This functionality is fully documented in the R5F61665N50FPV Hardware Manual.

What communication interfaces are integrated into the R5F61665N50FPV?

The R5F61665N50FPV integrates four Serial Communications Interfaces (SCI), each supporting asynchronous (UART) and clock-synchronous modes, plus a Data Transfer Controller (DTC) for autonomous data movement. It does not include CAN, USB, or Ethernet controllers. The SCI modules support standard framing (data bits, parity, stop bits), programmable baud rates, and hardware flow control - making them suitable for Modbus RTU, ASCII command protocols, or debug interfaces in industrial applications.

Is the R5F61665N50FPV pin-compatible with other H8SX/1665 family members?

The R5F61665N50FPV shares the same 144-pin LQFP package and pin assignment with R5F61665M (H8SX/1665M variant) and R5F61662/R5F61662M, but differs in memory size, peripheral enablement, and clock configuration options. Pin compatibility is confirmed in Section 1.4.1 ("Pin Assignments") of the H8SX/1665 Group Hardware Manual Rev. 2.00. However, software initialization and peripheral register settings must be verified per device variant due to differences in memory map and feature gating.

What is the Flash memory endurance and data retention specification for the R5F61665N50FPV?

The R5F61665N50FPV specifies Flash memory endurance of 10,000 write/erase cycles and data retention of 20 years at +85°C or 100 years at +25°C, per Renesas' standard Flash reliability characterization for the H8SX/1665 Group. These values apply to the on-chip 512 KB Flash array and assume adherence to programming voltage, timing, and sequence requirements defined in the R5F61665N50FPV Hardware Manual. Wear leveling must be implemented in firmware for applications exceeding cycle limits.