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M41T66 Datasheet(PDF) 7 Page - STMicroelectronics

Part # M41T66
Description  Serial access real-time clock with alarms
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T66 Datasheet(HTML) 7 Page - STMicroelectronics

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M41T66
Description
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Figure 4.
Hardware hookup for SuperCap™ backup operation
1.
Open drain
2.
For a crystal with a load capacitance (CL) of 12.5 pF, two parallel external 12.5 pF capacitors (C1 and C2)
must be added to achieve better clock accuracy.
3.
It can also be connected to another power supply.
4.
Due to the output buffer circuitry used for the SQW output, this pin must not be taken to a voltage greater
than VCC. Diode required on SQW pin for SuperCap™ (or battery) backup. Low threshold BAT42 diode
recommended.



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