NXP Semiconductors MC908JL3ECFAE

Overview

MC908JL3ECFAE from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller featuring 4 KB FLASH, 192 B RAM, a 10-bit ADC with 8 channels, a 16-bit TIM module with PWM and input capture, and integrated COP watchdog and LVI voltage monitor. It operates at up to 8 MHz bus frequency and targets low-cost embedded control in appliance motor drives and industrial sensor interfaces.

For engineers reviewing the MC908JL3ECFAE datasheet, MC908JL3ECFAE pinout, MC908JL3ECFAE application, or MC908JL3ECFAE equivalent, key selection criteria include its 20-pin SOIC package, 5 V operation, on-chip monitor ROM for in-system programming, and support for wait/stop low-power modes in battery-constrained designs.

Technical Context

The MC908JL3ECFAE implements the HCS08 CPU core with 52-instruction set, 16-bit index register, and condition-code-based branching. Its System Integration Module (SIM) provides clock generation from internal RC or external crystal oscillator, reset supervision, and interrupt vectoring with priority encoding across IRQ, KBI, TIM, and ADC sources.

Memory architecture includes 4 KB on-chip FLASH organized in 128-byte blocks with programmable protection, 192 B RAM, and 512 B monitor ROM accessible via serial interface. The ADC supports single-ended conversions with configurable sample time and auto-triggering from TIM overflow.

Key Specifications

Pinout & Package

MC908JL3ECFAE is housed in a 20-pin SOIC package (JEDEC MS-013AC), measuring 7.5 mm × 12.8 mm with 0.635 mm lead pitch. Thermal resistance θ_JA is 100°C/W under standard JEDEC 2s2p board conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908JL8ECFAE, the MC908JL3ECFAE offers sufficient FLASH for basic control firmware but less headroom for feature expansion; versus MC9RS08KA2CSC, it delivers richer analog and timing peripherals at higher pin count and cost-making it optimal for mixed-signal edge nodes needing reliability and field upgradeability.

Availability

MC908JL3ECFAE is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor interface, consumer remote control hub, and smart power outlet applications requiring stable component supply and long-term manufacturing continuity.

Supply support for MC908JL3ECFAE 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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The MC908JL3ECFAE belongs to the legacy HCS08 microcontroller family designed for cost-sensitive, low-power embedded control in white goods, building automation, and industrial equipment where robustness and toolchain maturity are critical.

FAQ

What is the maximum bus frequency supported by the MC908JL3ECFAE?

The MC908JL3ECFAE supports a maximum bus frequency of 8 MHz. This is achieved using the internal RC oscillator trimmed to ±2% accuracy or an external crystal oscillator up to 8 MHz. At this speed, the HCS08 core executes instructions at approximately 2 million instructions per second (MIPS), enabling responsive real-time control in motor and sensor applications where the MC908JL3ECFAE is commonly deployed.

Does the MC908JL3ECFAE include hardware debug support?

Yes, the MC908JL3ECFAE includes dedicated hardware debug support via its Break Module. This includes a dedicated BKGD pin for single-wire background debugging, break address registers, and status flags that preserve CPU context during halt. Engineers can use standard BDM (Background Debug Mode) tools to perform non-intrusive memory inspection, register reads/writes, and breakpoint execution-all without requiring additional debug circuitry on the target board containing the MC908JL3ECFAE.

Can the MC908JL3ECFAE operate from a 3.3 V supply?

No, the MC908JL3ECFAE is specified only for 4.5 V to 5.5 V operation. Its electrical characteristics-including FLASH programming voltage, ADC reference stability, and I/O threshold levels-are validated exclusively within this 5 V range. Attempting to power the MC908JL3ECFAE from 3.3 V may result in undefined behavior, failed FLASH writes, or inconsistent ADC readings. For 3.3 V systems, designers should consider newer NXP Kinetis or S32K families instead of the MC908JL3ECFAE.

How many ADC channels does the MC908JL3ECFAE support, and what is their input configuration?

The MC908JL3ECFAE supports eight single-ended ADC input channels mapped to PTA0–PTA3 and PTD0–PTD3. All channels share a common 10-bit successive-approximation converter with internal reference derived from V_DD. Conversion time is 21 bus cycles (2.6 µs at 8 MHz bus frequency), and the ADC supports both software-triggered and TIM-triggered sampling. No differential input mode or external reference option is available on the MC908JL3ECFAE.

Is there a drop-in replacement for the MC908JL3ECFAE with enhanced security features?

No direct drop-in replacement exists for the MC908JL3ECFAE with enhanced security features. While the MC908JL8ECFAE shares identical pinout and peripheral compatibility, it lacks cryptographic accelerators or secure boot. For security-enhanced alternatives, designers must migrate to NXP's S32K116 or K32L2B31A families-both requiring PCB layout changes, new toolchains, and firmware rearchitecture. The MC908JL3ECFAE itself provides only basic security via FLASH block protection bits and monitor ROM password lock.