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HT1381A - Serial Timekeeper Chip

Download the HT1381A datasheet PDF. This datasheet also covers the HT1380A variant, as both devices belong to the same serial timekeeper chip family and are provided as variant models within a single manufacturer datasheet.

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.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (HT1380A-HoltekSemiconductor.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

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HT1381 Serial Timekeeper Chip Holtek Semiconductor Inc
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HT1330 3 1/2 Digit Timer + Watch Holtek Semiconductor Inc

Other Datasheets by Holtek Semiconductor

Part Number Description
HT1380A Serial Timekeeper Chip
HT1382 I2C/3-Wire Real Time Clock
HT1015-1 1.5V Low Power LDO
HT1086 1.5A General Purpose LDO
HT1130 4-bit Microcontroller

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.

View original datasheet text
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.