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HT1380A - Serial Timekeeper Chip

General Description

The HT1380A/HT1381A is a serial timekeeper IC which provides seconds, minutes, hours, day, date, month and year information.

The number of days in each month and leap years are automatically adjusted.

Key Features

  • Operating voltage: 2.0V~5.5V.
  • Maximum input serial clock: 500kHz at VDD=2V, 2MHz at VDD=5V.
  • Operating current:.
  • less than 0.5μA at 2V.
  • less than 0.7μA at 3V.
  • less than 1.0μA at 5V.
  • TTL compatible.
  • VIH: 2.0V~VDD+0.3V at VDD=5V.
  • VIL: 0.3V~+0.8V at VDD=5V.
  • Two data transmission modes: single-byte, or burst mode.
  • Serial I/O transmission.
  • All.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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HT1380A/HT1381A Serial Timekeeper Chip Features • Operating voltage: 2.0V~5.5V • Maximum input serial clock: 500kHz at VDD=2V, 2MHz at VDD=5V • Operating current: –– less than 0.5μA at 2V –– less than 0.7μA at 3V –– less than 1.0μA at 5V • TTL compatible –– VIH: 2.0V~VDD+0.3V at VDD=5V –– VIL: 0.3V~+0.8V at VDD=5V • Two data transmission modes: single-byte, or burst mode • Serial I/O transmission • All registers store BCD format • HT1380A: 8-pin DIP package HT1381A: 8-pin SOP package Applications • Microcomputer serial clock • Clock and Calendar General Description The HT1380A/HT1381A is a serial timekeeper IC which provides seconds, minutes, hours, day, date, month and year information. The number of days in each month and leap years are automatically adjusted.