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HT1380/HT1381
-- 时钟万年历IC
General
Description
The HT1380/HT1381 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
HT1380/HT1381 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-hour mode.
The HT1380/HT1381 has
several registers to store the corresponding
information with 8-bit data format. A 32768Hz
crystal is required to provide the correct
timing. In order to minimize the pin number, the
HT1380/HT1381 use a serial I/O transmission
method to interface with a microprocessor. Only
three wires are required: (1) RESTB, (2) SCLK
and (3) I/O. Data can be delivered 1 byte at a
time or in a burst of up to 8 bytes.
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Features
- Operating voltage: 2.0V~5.5V
- Maximum input serial clock: 500kHz
at VDD=2V, 2MHz at VDD=5V
- Operating current: less than 400nA
at 2V, less than 1.2uA 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
- HT1380: 8-pin DIP package
HT1381: 8-pin SOP package
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