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Product Overview:

The UPD78905x microcontroller is 8-bit 78K0S core microcontroller for general purpose.

Key Features:

Operating voltage: VDD = 1.8 to 5.5 V
Max. frequency: 5 MHz
ROM capacities: 4 KB mask ROM and 4 KB EEPROM
RAM capacities: 128 bytes
20-pin plastic SSOP package
System clock: Ceramic/crystal oscillation
Minimum instruction execution time can be changed from high-speed (0.4 µs) to low-speed (1.6 µs) at 5.0 MHz operation with system clock.
I/O ports: 14
Timer: 3 channels

  • 8-bit timer: 2 channels
  • Watchdog timer: 1 channel

On-chip power-on-clear circuit (µPD78E9860A only)
On-chip bit sequential buffer
Operating ambient temperature: TA = -40 to +85°C

Key Applications:

  • TPMS (Tire Pressure Monitoring Systems) and other automotive electrical equipment.

Product Lineup:


Alliance Partner



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