Renesas R5F21194DSP#U0

Overview

R5F21194DSP#U0 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/19 Group, featuring an R8C/Tiny Series CPU core, 16 KB program flash ROM, 2 KB data flash (1 KB × 2 blocks), and 1 KB RAM. It operates at up to 20 MHz (50 ns min. instruction time), supports 20-pin LSSOP (PLSP0020JB-A) packaging, and integrates UART, clock-synchronous serial I/O, 16-bit Timer C, dual 8-bit timers, 4-channel comparator, and on-chip oscillators - deployed in industrial sensor nodes and appliance control systems.

For engineers reviewing the R5F21194DSP#U0 datasheet, R5F21194DSP#U0 pinout, R5F21194DSP#U0 application, or R5F21194DSP#U0 equivalent, key selection criteria include its -40°C to +85°C operating range (D-grade), integrated data flash for parameter storage, low-power stop mode (0.7 µA), and 20-pin LSSOP footprint with mixed analog/digital I/O capability.

Technical Context

The R5F21194DSP#U0 implements the R8C/Tiny CPU core with 89 fundamental instructions and a 20-bit program counter, enabling 1 Mbyte address space access. Its memory architecture separates 16 KB program ROM (0C000h–0FFFFh) from dedicated 2 KB data flash (02400h–02BFFh), supporting in-system reprogramming with 10,000 write/erase cycles.

Peripheral integration includes three independent timers (Timer X/Z: 8-bit with prescaler; Timer C: 16-bit with input capture/output compare), dual UART channels, one clock-synchronous serial interface, and a 4-channel 1-bit comparator with analog inputs AN8–AN11 - all controlled via SFRs mapped to 00000h–002FFh.

Key Specifications

Pinout & Package

Package: 20-pin molded-plastic LSSOP (PLSP0020JB-A), 7.6 mm × 4.4 mm body, 0.65 mm lead pitch, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R5F21194DSP#U0, R5F21194DD offers through-hole mounting at the expense of modern SMT efficiency, while R5F21194NP provides pin expansion and thermal advantages in a QFN format - neither is pin-compatible, requiring PCB revision for migration.

Availability

R5F21194DSP#U0 is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control systems, and office equipment requiring stable component supply across extended product lifecycles.

Supply support for R5F21194DSP#U0 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, and power solutions for industrial, automotive, and IoT applications.

The R8C/19 Group, including R5F21194DSP#U0, was designed for cost-sensitive, low-power embedded control in appliances and industrial equipment - emphasizing integrated data flash, wide temperature operation, and minimal external components.

FAQ

What is the maximum operating frequency of the R5F21194DSP#U0?

The R5F21194DSP#U0 supports a maximum operating frequency of 20 MHz at VCC = 3.0–5.5 V, achieving a minimum instruction execution time of 50 ns. This timing is validated under specified voltage and temperature conditions per Renesas datasheet REJ03B0124-0140, and requires stable clock source (crystal or on-chip oscillator) and proper decoupling.

Does the R5F21194DSP#U0 include on-chip debug capability?

Yes, the R5F21194DSP#U0 supports on-chip debugging via the single-wire background debug mode (BDM) interface using the RESET pin. This allows full breakpoint, step-through, and memory inspection functionality without requiring additional debug headers - confirmed in Section 5.3 of the official hardware manual.

What is the endurance specification for the data flash in the R5F21194DSP#U0?

The R5F21194DSP#U0 data flash is rated for 10,000 write/erase cycles per block (1 KB × 2), as specified in Table 1.2 of the R8C/19 Group datasheet. This endurance applies under standard operating conditions (VCC = 2.7–5.5 V, TA = -40°C to +85°C) and assumes proper erase-before-write sequencing per Renesas flash programming guidelines.

Can the R5F21194DSP#U0 operate from a 3.3 V supply only?

Yes, the R5F21194DSP#U0 operates reliably at 3.3 V (within its 2.7–5.5 V range), supporting 20 MHz operation down to 2.7 V. At 3.3 V, typical active current is ~7.2 mA (interpolated from 5.0 V/9 mA and 3.0 V/5 mA data points), and stop-mode current remains 0.7 µA - making it suitable for 3.3 V system designs without level translation.

Which package variant does R5F21194DSP#U0 use, and what are its key mechanical features?

R5F21194DSP#U0 uses the 20-pin LSSOP package (PLSP0020JB-A): 7.6 mm × 4.4 mm body, 0.65 mm lead pitch, gull-wing leads, and no exposed thermal pad. Its compact footprint and fine-pitch design support high-density PCB layouts while maintaining hand-soldering feasibility for low-volume builds.