DS1344E-18+ Maxim Integrated Products, DS1344E-18+ Datasheet - Page 8

• Manufacturer Part Number: DS1344E-18+
• Description: Real Time Clock SPI RTC 20P TSSOP 1.8V 12.5PF ALRM
• Manufacturer: Maxim Integrated Products

Low-Current SPI/3-Wire RTCs
8
13, 17, 19
2, 4, 6, 8,
TSSOP
1
3
5
7
9
PIN
TDFN-EP
TOP VIEW
V
INT0
INT1
GND
N.C.
N.C.
N.C.
N.C.
BAT
X1
X2
1
4
2
3
5
6
10
1
2
3
4
5
6
7
8
9
NAME
V
INT0
INT1
N.C.
X1
X2
BAT
TSSOP
DS1343
DS1344
Battery Input for Standard +3V Lithium Cell or Other Energy Source. UL recognized
to ensure against reverse charging current when used in conjunction with a primary
lithium battery.
No Connection. N.C. pins can be connected to GND to reduce noise around the
crystal inputs.
Connections for Standard 32.768kHz Quartz Crystal (see the Crystal Characteristics
table). The devices can also be driven by an external 32.768kHz oscillator. In this
configuration, the X1 pin is connected to the external oscillator and the X2 pin is left
unconnected.
Active-Low Interrupt 0 Output. INT0 is an active-low output that can be used as
an interrupt output to a processor. INT0 can be programmed to be asserted by
only Alarm 0, or can be programmed to be asserted by either Alarm 0 or Alarm 1.
INT0 remains low as long as the status bit causing the interrupt is present and the
corresponding interrupt enable bit is set. INT0 operates when the component is
powered by V
pullup resistor.
Active-Low Interrupt 1 Output. INT1 is an active-low output that can be used either
as an interrupt output to a processor or a 32kHz square-wave output. INT1 can be
programmed to be asserted by Alarm 1 only. INT1 remains low as long as the status
bit causing the interrupt is present and the corresponding interrupt enable bit is set.
INT1 operates when the component is powered by V
drain output and requires an external pullup resistor.
20
19
18
17
16
15
14
13
12
11
CC
or V
V
N.C.
PF
N.C.
SDO
SDI
SCLK
N.C.
CE
SERMODE
CC
BAT
. INT0 is an open-drain output and requires an external
TOP VIEW
FUNCTION
14
1
+
13
2
(3mm × 3mm)
12
3
TDFN
DS1343
DS1344
11
4
CC
Pin Configurations
or V
10
5
Pin Descriptions
BAT
9
6
EP
. INT1 is an open-
8
7