HT1381A - Holtek Semiconductor

HT1381A Serial Timekeeper Chip

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. The HT1380A/HT1381A is designed for low power consumption and can operate in two modes: one is the 12-hour mode with an AM/PM indicator, the other is the 24-ho.

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 sec.