
DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
25
Maxim Integrated
DS1390/
DS1394
DS1393
DS1391
DS1392
CE
SQW
I/O
CPU
VCC
DIN
CS
GND
X2
X1
CRYSTAL
SQW/INT
VBACKUP
SCLK
DOUT
INT
CPU
VCC
CE
GND
X2
X1
CRYSTAL
SQW/INT
VBACKUP
SCLK
I/O
CPU
VCC
DIN
RST
CS
GND
X2
X1
CRYSTAL
VBACKUP
SCLK
DOUT
CPU
VCC
GND
X2
X1
CRYSTAL
VBACKUP
SCLK
RST
Typical Operating Circuits
Package Information
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND
PATTERN NO.
10 SOP
—