Datasheet

M41T66 Description
Doc ID 15108 Rev 2 7/34
Figure 4. Hardware hookup for SuperCap™ backup operation
1. Open drain
2. For a crystal with a load capacitance (C
L
) of 12.5 pF, two parallel external 12.5 pF capacitors (C
1
and C
2
)
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 V
CC
. Diode required on SQW pin for SuperCap™ (or battery) backup. Low threshold BAT42 diode
recommended.
!)B
6
##
0ORT
317).
3ERIAL#LOCK,INE
3E
RIAL$ATA,INE
8/
8)
-4
-#5
6
33
)21/54

317

3$!
3#,
6
##
6
##
#

#




