MC9S08LL8CGT - 8-Bit 20MHz S08 MCU | NXP
MPN: MC9S08LL8CGT ✗ End of LifeMC9S08LL8CGT Overview
An 8-bit microcontroller is a programmable semiconductor containing a central processing unit, memory, peripherals, and I/O interfaces on one integrated circuit. The S08 architecture belongs to the broader HCS08 microcontroller family and provides a compact platform for embedded control, low-power sensing, display handling, and appliance control. The MC9S08LL8CGT is positioned for systems that require modest processing throughput, low system complexity, and economical integration.
The MC9S08LL8CGT combines a 20 MHz S08 core with 10 KB of Flash and 2 KB of RAM. Flash retains programmed firmware when power is removed, while RAM supports working data, stack operations, and peripheral buffers. Its integrated LCD driver reduces the external component count in segmented-display products, and the low-voltage detection function supports monitoring of the system supply. Operation around 2.5 V and 3.3 V supports low-voltage portable equipment designs.
The device uses the HCS08 instruction set and an S08 CISC-based processor architecture. This structure favors compact code execution, efficient peripheral integration, and deterministic embedded control rather than high-throughput application processing. Its 48-terminal no-lead package exposes the LCD, communication, timer, input, output, and power functions on a small surface-mount footprint, while the exposed pad supports improved heat transfer on the PCB.
Typical applications include battery-powered medical diagnostic products, handheld appliances, segmented LCD instruments, simple metering systems, small industrial controls, and low-power consumer devices. The LCD driver is especially useful when the product presents measurements or status information on a fixed-segment display. The 20 MHz clock also provides sufficient performance for sensor acquisition, control-loop execution, and communication-interface handling in compact embedded equipment.
Designers should account for the exposed-pad thermal path, maintain the required input and decoupling connections, and verify display and peripheral assignments against the manufacturer pin-description table. Because the product is designated End of Life by NXP, long-life programs should confirm availability, lifecycle transition timing, and approved sourcing arrangements before committing new production designs.
This page organizes the manufacturer specifications, lifecycle status, packaging information, practical application guidance, and engineering considerations needed to evaluate the MC9S08LL8CGT for a new or legacy embedded-control design.
Drop-in alternatives for MC9S08LL8CGT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesMC9S08LL8CGT Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit S08 microcontroller |
| Processor Core | HCS08 S08 core |
| Instruction Set Architecture | CISC |
| Data Bus Width | 8 bit |
| Maximum Clock Frequency | 20 MHz |
| Flash Memory | 10 KB (8K x 8) |
| RAM | 2 KB |
| Operating Voltage | 2.5 V to 3.3 V |
| Core Voltage Across Temperature | 1.8 V |
| Integrated Display Support | Segment LCD driver |
| Voltage Monitoring | Low-voltage detection |
| Package | 48-pin QFN exposed-pad (HVQCCN) |
| Package Dimensions | 7 mm x 7 mm |
| Terminal Count | 48 |
| Mounting Type | Surface mount, no lead |
| Package Shape | Square |
| Temperature Grade | Industrial |
| Shipping Form | Tray |
MC9S08LL8CGT square Pin Configuration Guide
Pin configuration for MC9S08LL8CGT (square package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for MC9S08LL8CGT.
Refer to the datasheet for full pin configuration.
Typical Applications
MC9S08LL8CGT is suitable for 6 applications: Battery-Powered Medical Diagnostic Instrument, Handheld Appliance Controller, Segment LCD Metering Instrument, Low-Power Industrial Control Module, Portable Sensor and Monitoring Node, Low-Voltage Consumer Device.
Battery-Powered Medical Diagnostic Instrument
The MC9S08LL8CGT fits a compact diagnostic instrument that combines local sensing, a segment display, and low-power operation. Its 20 MHz 8-bit S08 core can execute acquisition control and user-interface logic, while 10 KB of Flash holds application firmware and 2 KB of RAM supports working buffers. The integrated segment LCD driver reduces the display-support component count, and low-voltage detection provides a basis for monitoring the supply. In a medical product, these functions support the control subsystem but do not replace the system-level electrical-safety and quality validation required for the finished instrument.
Recommended
Handheld Appliance Controller
The MC9S08LL8CGT is appropriate for a compact handheld appliance whose control board must combine local buttons, a simple display, timing, and low-power monitoring. Its 20 MHz S08 core provides more operating headroom than the minimum control task, while 10 KB of Flash and 2 KB of RAM accommodate firmware, state, and small data buffers. The segment LCD driver can operate a fixed-character display without a separate display controller. Low-voltage detection is useful when the product operates from a battery or a loosely regulated supply and must recognize a falling input condition.
Recommended
Segment LCD Metering Instrument
The MC9S08LL8CGT fits a simple metering instrument built around a segment LCD and a sensor interface. The 8-bit S08 core can convert sampled measurements, apply calibration, drive the display state, and supervise control outputs. Its 10 KB of Flash is suitable for a compact embedded application, and 2 KB of RAM can support temporary measurement values and communication buffers. Because the LCD driver is integrated, the board can avoid a separate display-driver IC while retaining a clear separation between the microcontroller and the display glass.
Recommended
Low-Power Industrial Control Module
The MC9S08LL8CGT can serve as the local controller in a small industrial module that monitors discrete inputs, controls outputs, and presents status on a segment display. Its 20 MHz clock supports responsive task execution, while the 8-bit S08 architecture keeps the software model practical for compact embedded firmware. The 48-pin QFN exposed-pad package provides access to the device’s I/O and communication resources on a compact board. The exposed pad must be connected and thermally evaluated according to the manufacturer layout guidance for reliable heat transfer.
Recommended
Portable Sensor and Monitoring Node
The MC9S08LL8CGT is a practical fit for a portable sensor node that periodically reads an analog or digital sensing interface, records results, and reports status. The 20 MHz S08 core provides enough timing flexibility for acquisition sequences and peripheral servicing, while 10 KB of Flash and 2 KB of RAM suit a focused embedded workload. The low-voltage detection feature assists with battery-condition monitoring, and the LCD driver can provide local readouts when a display is present. Power-consumption optimization should use the device’s documented low-power modes together with the sensor and radio load.
Recommended
Low-Voltage Consumer Device
The MC9S08LL8CGT fits low-voltage consumer equipment where an economical controller, compact display, and embedded user interface are more important than high processing bandwidth. Operation around 2.5 V and 3.3 V aligns the MCU with common portable-system rails, while low-voltage detection adds system monitoring at low hardware cost. The 10 KB Flash capacity and 2 KB RAM are adequate for focused appliance firmware rather than complex connectivity stacks. Designers should evaluate the End of Life status against the product’s expected production volume and support lifetime before finalizing the architecture.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08LL8CGT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 48-pin QFN exposed-pad (HVQCCN), 7 mm x 7 mm |
| Brand | NXP Semiconductors |
| Processor Core | HCS08 S08 core |
| Architecture | 8-bit CISC |
| Maximum Clock Frequency | 20 MHz |
| Flash Memory | 10 KB (8K x 8) |
| RAM | 2 KB |
| Operating Voltage | 2.5 V to 3.3 V |
| Display Support | Integrated segment LCD driver |
| Lifecycle Status | End of Life |
Key Differentiators
- Integrated segment LCD support reduces display-system complexity (vs MC9S08QE4CTG)
- Purpose-built S08LL positioning for portable and battery-powered products (vs MC9S08QE4CTG)
- Compact integrated resource set for embedded-control designs (vs MC9S08QE4CTG)
Design Notes
The 48-pin QFN exposed pad is part of the device’s thermal and electrical footprint. Follow the manufacturer’s exposed-pad connection and land-pattern guidance, provide a continuous ground-connected copper path beneath the package where specified, and avoid isolated thermal-via arrangements that impede heat flow. For new production, evaluate junction temperature using actual regulator loss and PCB copper rather than assuming the small package can dissipate heat indefinitely.
Place input bypass capacitors and the required decoupling network close to their associated supply pins, with short and low-loop-area traces. Route sensitive sensor inputs, LCD segment outputs, and communication signals away from high-current switching paths. Confirm the manufacturer’s pin-description table before fixing the PCB footprint because exposed-pad packages require exact land geometry and orientation.
Design the supply around the MCU’s documented operating range and low-voltage-detection behavior. Avoid relying on the 2.5 V to 3.3 V operating description as proof that every external LCD, sensor, or communication device shares the same rail limits. Check startup, brownout behavior, and load transients together so that the controller, display, and sensors remain synchronized during voltage changes.
Do not treat the MC9S08LL8CGT as a generic drop-in replacement target. Its S08 programming model, LCD-drive assignments, peripheral multiplexing, memory organization, and 48-pin exposed-pad footprint must all be matched. Before migrating to another MCU, build a pin-by-pin matrix covering power, ground, programming, communications, LCD segments, reset, and all no-connect pins, then update firmware and validate display waveforms.
Compliance Information
The component is marked RoHS in a product listing, but no definitive compliance declaration was included in the available manufacturer information. Confirm all environmental and material compliance documents with NXP before production release.
