Date: 24/06/2012

HT1380A/HT1381A real-time clock chips from Holtek

Holtek has released the new real-time clock HT1380A/HT1381A devices. They are the enhanced version of their previously released HT1380/HT1381 devices. Holtek has used a more advanced manufacturing process to offer higher negative impedance capability, higher noise immunity and improved operating temperature characteristics.

The HT1380A/HT1381A devices are fully compatible with the predecessor HT1380/HT1381 devices with regard to features and package pins.

The HT1380A/HT1381A used as serial timekeeping devices, provide seconds, minutes, hours, day, date, month and year information. With regard to the number of days in each month and managing leap years, these requirements are internally adjusted automatically.

Features:
1. Operating current: <0.5uA(Max.)@VDD=2.0V
2. Operates in two modes - 12-hour mode with an AM/PM indicator and 24-hour mode
3. Two data transmission modes - Single-byte mode and Burst mode
4. Operating temperature range: -40 to 85°C
5. The HT1380A is packaged in an 8-pin DIP package
6. The HT1381A is packaged in an 8-pin SOP package

The HT1380A/HT1381A devices are easy to use real-time clock devices and can be used in application areas such as gas meters, work attendance recording, gate entry recording, cash registers, MP3 players, digital photo frames as well as office automation applications.