NXP Semiconductors MC9RS08KB8CTG

Overview

MC9RS08KB8CTG from NXP Semiconductors (formerly Freescale) is an 8-bit RS08 core microcontroller with 8 KB flash, 254-byte RAM, and integrated peripherals including 12-channel 10-bit ADC, analog comparator, TPM timer/PWM, IIC, SCI, and keyboard interrupt module. It operates from 1.8 V to 5.5 V at up to 20 MHz and supports industrial temperature range (–40 °C to 85 °C), targeting low-cost embedded control in sensor interfaces and appliance subsystems.

For engineers reviewing the MC9RS08KB8CTG datasheet, MC9RS08KB8CTG pinout, MC9RS08KB8CTG application, or MC9RS08KB8CTG equivalent, key selection considerations include its 24-pin QFN package (case 1982-01), single-wire background debug interface, on-chip voltage regulator, low-power stop mode (1.15 μA typical at 5 V), and compatibility with RS08 instruction set including BGND.

Technical Context

The MC9RS08KB8CTG implements a subset of the HC08 instruction set augmented with BGND for debugging, uses a single global interrupt vector, and features an internal clock source (ICS) with FLL for bus frequencies up to 10 MHz. Its power management includes Wait and Stop modes with wake-up capability via RTI, KBI, ADC, ACMP, SCI, and LVD.

Peripherals are tightly integrated: the 12-channel ADC supports hardware triggering and operation in Stop mode; the ACMP offers rail-to-rail operation and internal bandgap reference comparison; the TPM provides two channels configurable as input capture, output compare, or PWM; and the SCI includes LIN extensions and optional 13-bit break detection.

Key Specifications

Pinout & Package

MC9RS08KB8CTG is housed in a 24-pin QFN package (case 1982-01) with exposed thermal pad, optimized for compact PCB layouts and thermal performance in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC9RS08KB12CTG and MC9S08QG8CDTE, the MC9RS08KB8CTG delivers optimal balance of memory size, ultra-low Stop-mode current (1.15 μA), and integrated regulation-making it ideal for cost-sensitive, battery-powered control nodes where 8 KB flash suffices and QFN packaging is preferred.

Availability

MC9RS08KB8CTG is available at Aetrix Electronics and suitable for smart appliance control, industrial sensor interface, and automotive body electronics requiring stable component supply across extended product lifecycles.

Supply support for MC9RS08KB8CTG 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

NXP Semiconductors is a global semiconductor leader delivering secure, scalable solutions for automotive, industrial, IoT, and mobile applications.

The MC9RS08KB8CTG belongs to the RS08 family-a cost-optimized 8-bit MCU line designed for simple, deterministic control tasks in resource-constrained embedded systems where low power, small footprint, and ease of debug are critical.

FAQ

What is the maximum operating frequency of the MC9RS08KB8CTG?

The MC9RS08KB8CTG supports a maximum CPU frequency of 20 MHz across its full operating voltage range (1.8 V to 5.5 V) and temperature range (–40 °C to 85 °C). Its internal clock source (ICS) with frequency-locked-loop (FLL) enables stable bus frequencies up to 10 MHz, while external crystal or resonator options allow higher-speed operation with appropriate timing margining.

Does the MC9RS08KB8CTG support in-circuit debugging?

Yes, the MC9RS08KB8CTG includes a single-wire background debug interface (BKGD) on PTA4, enabling full in-circuit debugging-including breakpoint setting and register inspection-without requiring additional pins or headers. This interface operates independently of the main application code and remains functional even during low-power Stop mode.

What are the power consumption characteristics of the MC9RS08KB8CTG in Stop mode?

The MC9RS08KB8CTG achieves a typical Stop mode supply current of 1.15 μA at 5 V and 25 °C, with a maximum of 7.67 μA across the full temperature range (–40 °C to 85 °C). This ultra-low quiescent current is enabled by halting all clocks and placing the voltage regulator in standby, while retaining RAM contents and allowing wake-up via RTI, KBI, ADC, ACMP, SCI, or LVD events.

Can the MC9RS08KB8CTG operate from a 1.8 V supply?

Yes, the MC9RS08KB8CTG is fully specified to operate from 1.8 V to 5.5 V, supporting direct connection to single-cell Li-ion, LiFePO₄, or alkaline battery sources. At 1.8 V, it delivers 2.40 mA typical Run current (fBus = 10 MHz), maintains 254-byte RAM retention down to 0.81 V, and retains full peripheral functionality including ADC, ACMP, and TPM.

What package type is used for the MC9RS08KB8CTG?

The MC9RS08KB8CTG is supplied in a 24-pin QFN package (case number 1982-01) with an exposed thermal pad. This RoHS-compliant, lead-free package measures 4 mm × 4 mm × 0.85 mm and provides excellent thermal dissipation (θJA = 113 °C/W) and board-level reliability for high-density consumer and industrial PCBs.