DS1337C Maxim, DS1337C Datasheet - Page 5

• Manufacturer Part Number: DS1337C
• Description: The DS1337 serial real-time clock is a low-power clock/calendar with two programmable time-of-day alarms and a programmable square-wave output
• Manufacturer: Maxim

PIN DESCRIPTION
TIMING DIAGRAM
—
8
1
2
3
4
5
6
7
8
PIN
4–13
16
14
15
16
—
—
1
2
3
SQW/INTB
NAME
INTA
GND
SDA
SCL
N.C.
V
X1
X2
CC
Connections for a Standard 32.768kHz Quartz Crystal. The internal
oscillator circuitry is designed for operation with a crystal having a specified
load capacitance (C
and crystal layout considerations, refer to Application Note 58: Crystal
Considerations with Dallas Real-Time Clocks. An external 32.768kHz
oscillator can also drive the DS1337. In this configuration, the X1 pin is
connected to the external oscillator signal and the X2 pin is floated.
Interrupt Output. When enabled, INTA is asserted low when the
time/day/date matches the values set in the alarm registers. This pin is an
open-drain output and requires an external pullup resistor.
voltage may be up to 5.5V, regardless of the voltage on V
may be left floating.
Ground. DC power is provided to the device on this pin.
Serial Data Input/Output. SDA is the input/output pin for the I
interface. The SDA pin is open-drain output and requires an external pullup
resistor.
Serial Clock Input. SCL is used to synchronize data movement on the serial
interface.
Square-Wave/Interrupt Output. Programmable square-wave or interrupt
output signal. It is an open-drain output and requires an external pullup
resistor.
If not used, this pin may be left floating.
DC Power. DC power is provided to the device on this pin.
No Connect. These pins are not connected internally, but must be
grounded for proper operation.
The pull up voltage may be up to 5.5V, regardless of the voltage on V
5 of 16
L
) of 6pF. For more information about crystal selection
FUNCTION
DS1337 I
2
C Serial Real-Time Clock
CC
. If not used, this pin
The pull up
2
C serial
CC
.