MC68HC908JB8JPE
MC68HC908JB8JPE - 8-bit HC08 USB MCU, 8KB Flash | NXP
The NXP MC68HC908JB8JPE is an 8-bit HC08-family microcontroller unit (MCU) with integrated USB device support, 8KB of on-chip Flash program memory, 256 bytes of RAM, and 13 general-purpose I/O lines, packaged in a 20-pin PDIP (through-hole DIP) commercial-temperature grade enclosure. It operates from a single 4.0V to 5.5V supply at an internal bus speed of 3 MHz, and embeds a low-voltage detect (LVD), power-on reset (POR), PWM module, and a USB 1.1 full-speed device controller - features that historically made it a popular choice for low-cost USB peripherals such as HID-class devices, custom HID mice/keyboards, USB-to-serial bridges, and USB-capable toys.
Background: an 8-bit microcontroller is a single-chip computer built around an 8-bit data path that integrates a CPU core, program memory, RAM, and peripheral modules (timers, I/O, communications). Within the broader semiconductor taxonomy, the HC08 sits below 16-bit (HC12/HCS12) and 32-bit (ColdFire/ARM Cortex-M) NXP architectures and above simple 4-bit controllers; HC08 parts use a CISC instruction set, are programmed in C or assembly, and target cost-sensitive embedded applications. The 'JB' family specifically integrates a USB device controller, eliminating the need for an external USB transceiver IC and reducing BOM cost in legacy USB 1.1 designs.
Key features include 8KB (8K x 8) of in-application-programmable Flash memory, 256 bytes of RAM, an integrated USB 1.1 full-speed device transceiver (12 Mbps), 13 bidirectional I/O pins, two timer/PWM channels, LVD and POR supervision, and a CISC HC08 CPU core running at 3 MHz internal bus speed. The 20-pin PDIP package (JPE suffix) is the through-hole variant of the family, and parts are supplied in tube packaging (RoHS-compliant per current distributor listings). The part is marked obsolete by current NXP lifecycle data, but it remains widely available from authorized distributors and the open market for legacy maintenance.
Typical applications include legacy USB HID peripherals (mice, keyboards, game pads), USB-to-UART bridges, low-cost USB dongles for authentication and software protection dongles, industrial USB I/O expanders, and educational/development platforms where the on-chip USB simplifies hardware. The integrated USB transceiver eliminates external PHY circuitry, reducing PCB area and BOM cost compared to MCU-plus-external-PHY designs.
When designing with this MCU, note that it is commercial temperature grade (0C to +70C) and is not AEC-Q100 qualified - for automotive or industrial extended-temperature applications, choose an industrial-grade variant or a modern Kinetis/LPC equivalent. Because the part is now obsolete, plan for lifecycle risk: source sufficient inventory for the product's expected lifetime, or migrate to a pin-compatible modern alternative. The USB module pins (PTE3/PTE4) double as 10 mA open-drain GPIO when USB is disabled.
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