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HT1381 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT1381 Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
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1 / 10 page  HT1380/HT1381 Serial Timekeeper Chip Block Diagram Pin Assignment 1 October 2, 1999 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 1.2mAat5V · 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 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 auto- matically adjusted. The HT1380/HT1381 is de- signed 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 se- rial I/O transmission method to interface with a microprocessor. Only three wires are required: (1) REST, (2) SCLK and (3) I/O. Data can be de- livered 1 byte at a time or in a burst of up to 8 bytes. Applications · Microcomputer serial clock · Clock and Calendar 1 2 3 4 8 7 6 5 NC X1 X2 VSS VD D SC L K I/O RE S T H T 1380 8 D I P 1 2 3 4 8 7 6 5 NC X1 X2 VSS VD D SC L K I/O RE S T H T 1381 8 S O P RE S T Da t a S h i f t R egi s t er C o mma n d C ont rol Logi c R eal T i m e Cl o c k O s c i lla t o r a n d Di v i d e r Ci rc u i t X1 X2 SC L K I/O |
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