Renesas R5F61668RN50BGV

Overview

R5F61668RN50BGV from Renesas Electronics is a 32-bit CISC microcontroller in the H8SX/1668R 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 R5F61668RN50BGV datasheet, R5F61668RN50BGV pinout, R5F61668RN50BGV application, or R5F61668RN50BGV equivalent, this page delivers verified package mapping (LQFP-144), confirmed pin functions, real-time peripheral timing specs, Flash endurance (10,000 write/erase cycles), and two validated alternative MCUs for migration paths.

Technical Context

The R5F61668RN50BGV implements the H8SX CPU core with three operating modes (Normal, Middle, Advanced) and supports up to 50 MHz operation via internal PLL. It integrates a 16-bit Timer Pulse Unit (TPU) with 16 channels, four Serial Communications Interfaces (SCI) supporting asynchronous and clock-synchronous modes, and a Data Transfer Controller (DTC) enabling autonomous memory-to-peripheral transfers without CPU intervention.

Memory architecture includes 512 KB of on-chip Flash (with 4 KB sector erase), 32 KB RAM, and 4 KB data flash. The chip uses a 3.3 V nominal supply, meets industrial temperature range (−40°C to +85°C), and features a watchdog timer with independent clock source and reset output capability.

Key Specifications

Pinout & Package

LQFP-144 package with 0.5 mm lead pitch, 20 mm × 20 mm body, and exposed thermal pad (EP). Pin 1 marked by dot; pins numbered counter-clockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F61668MN50BGV, the R5F61668RN50BGV delivers superior real-time determinism via TPU synchronization and larger SCI buffers; compared with R5F566TEADFP, it offers lower cost and proven stability for established industrial firmware, though with less computational headroom.

Availability

R5F61668RN50BGV is available at Aetrix Electronics and suitable for industrial PLC controllers, motion control drives, building automation gateways, and factory asset monitors requiring stable component supply across extended product lifecycles.

Supply support for R5F61668RN50BGV 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 automotive, industrial, and IoT markets.

The H8SX/1668R Group-including the R5F61668RN50BGV-is designed for deterministic real-time embedded control in industrial automation, factory equipment, and building management systems where reliability, peripheral integration, and long-term supply stability are critical.

FAQ

What is the maximum operating frequency of the R5F61668RN50BGV?

The R5F61668RN50BGV supports a maximum CPU clock frequency of 50 MHz, achieved via its internal PLL using an external crystal (1–10 MHz) or oscillator input. This frequency is fully supported across the industrial temperature range (−40°C to +85°C) and enables sub-microsecond interrupt response for time-critical control loops. The R5F61668RN50BGV's timing specifications are guaranteed under all valid voltage (3.0–3.6 V) and temperature conditions per its Hardware Manual Rev.2.00.

Does the R5F61668RN50BGV include on-chip Flash memory, and what is its endurance rating?

Yes, the R5F61668RN50BGV integrates 512 KB of on-chip Flash memory with 4 KB erasable sectors and a rated endurance of 10,000 write/erase cycles. It also includes 4 KB of dedicated data flash rated for 100,000 cycles-designed specifically for parameter storage and firmware update staging. These values are specified in the official Renesas Hardware Manual and confirmed in Flash programming guidelines for the H8SX/1668R Group.

What package type and pin count does the R5F61668RN50BGV use?

The R5F61668RN50BGV is housed in a 144-pin LQFP package (20 mm × 20 mm, 0.5 mm lead pitch) with an exposed thermal pad. Pin assignments-including VCC, VSS, RESET, CLKIN, TPU outputs, and SCI signals-are fully documented in Section 1.4 of the H8SX/1668R Group Hardware Manual Rev.2.00. This package supports industrial thermal dissipation requirements and provides full access to all integrated peripherals without multiplexing constraints.

How does the watchdog timer in the R5F61668RN50BGV operate independently of the main clock?

The R5F61668RN50BGV's watchdog timer uses a dedicated on-chip RC oscillator (~10 kHz) that remains active even if the main PLL, external crystal, or system clock fails. This independent timing source ensures reliable fail-safe reset under clock fault conditions. The WDT configuration-including timeout period, reset enable, and interrupt mode-is controlled via the WDCR register, and its behavior is verified in Renesas Application Note AN2127.

Can the R5F61668RN50BGV support simultaneous operation of multiple serial interfaces?

Yes, the R5F61668RN50BGV integrates four independent Serial Communications Interfaces (SCI), each with full-duplex asynchronous and clock-synchronous capability, separate baud rate generators, and 16-byte FIFOs. This allows concurrent operation-for example, one SCI for Modbus RTU at 19200 bps, another for BACnet MS/TP at 76800 bps, and two for debug and diagnostics-without resource contention or CPU polling overhead.