HT1381-8SOPLF HOLTEK, HT1381-8SOPLF Datasheet - Page 7

• Manufacturer Part Number: HT1381-8SOPLF
• Description: IC, TIMEKEEPER, SERIAL, SMD, SOP8
• Manufacturer: HOLTEK

Specifications of HT1381-8SOPLF

• Clock Format: HH
• Clock Ic Type: Timekeeper
• Supply Voltage Range: 2V To 5.5V
• Digital Ic Case Style: SOP
• No. Of Pins: 8
• Operating Temperature Range: 0°C To +70°C
• Date Format: DD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The following diagram shows the single and burst mode transfer:
The table illustrates the values suggested for capacities C1, C2
Operating flowchart
To initiate any transfer of data, REST is taken high and an 8-bit command byte is first loaded into the
control logic to provide the register address and command information. Following the command
word, the clock/calendar data is serially transferred to or from the corresponding register. The REST
pin must be taken low again after the transfer operation is completed. All data enter on the rising
edge of SCLK and outputs on the falling edge of SCLK. In total, 16 clock pulses are needed for a sin-
gle byte mode and 72 for burst mode. Both input and output data starts with bit 0.
In using the HT1380/HT1381, set first the WP and CH to 0 and wait for about 3 seconds, the oscilla-
tor will generate the clocks for internal use. Then, choose either single mode or burst mode to input
the data. The read or write operating flowcharts are shown on the next page.
HT1380/HT1381
Part No.
Crystal Error
10~20ppm
±10ppm
7
Capacity Value
HT1380/HT1381
5pF
8pF
September 18, 2000