HT1381-8SOPLF – HOLTEK

Overview

The HOLTEK HT1381-8SOPLF is a highly integrated serial Timekeeper Chip designed to provide accurate timekeeping functions, including seconds, minutes, hours, day, date, month, and year. Its automatic adjustment for leap years and varying month lengths simplifies system design. A critical design consideration for this device is the external 32768Hz crystal oscillator, where component selection and PCB layout are paramount to ensure minimal frequency drift and phase noise, which directly impacts long-term timekeeping accuracy, especially in environments with fluctuating temperatures. The serial I/O interface minimizes pin count, a common trade-off in space-constrained embedded systems.

Key Features

• Serial I/O transmission for reduced pin count
• Supports both 12-hour (with AM/PM) and 24-hour clock formats
• 8-bit data registers storing information in BCD format
• Wide operating supply voltage range: 2V to 5.5V
• Operating temperature range: 0°C to 70°C
• Compact 8-pin SOP package

Applications

The component is engineered for deployment in systems requiring high reliability and performance under specific operating conditions. It provides functional stability across the stated design envelope.

• Real-time clock backup for embedded systems and IoT devices
• Time stamping of event logs in industrial control panels
• Power sequencing and management in battery-operated portable electronics
• Data logging and monitoring in consumer electronics with date/time context