DS32KHZSN Maxim Integrated Products, DS32KHZSN Datasheet - Page 7

• Manufacturer Part Number: DS32KHZSN
• Description: Timers & Support Products 32.768kHz Push-Pull TXCO Crystal Oscilla
• Manufacturer: Maxim Integrated Products

Specifications of DS32KHZSN

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 4. Power-Supply Connections
Figure 5
interchangeable option. Using this connection scheme and the recommended layout provides a solution, which
requires no hardware modifications. Only one device should be used at a time, and both layouts should be located
very close together if the recommended layout is not used.
The DS32kHz I
crystal or resonator. Driving the oscillator circuit with the rail-to-rail output of the DS32kHz can increase the I
I
can be used to reduce the current consumption of a DS32kHz and an RTC. The values of R1 and C1 may vary
depending on the RTC used. However, values of 1.0MΩ and 100pF are recommended as a starting point. R2 is
used to shift the input waveform to the proper level. The recommended value for R2 is 33kΩ.
Figure 5. DS32kHz Connections
Figure 6. DS32kHz and RTC Connections
BAT
V
BAT
2.7V - 3.3V
currents significantly and increase the current consumption of the RTC as well.
V
V
A PC board can be laid out so that the RTC can use either the DS32kHz or a crystal
BAT
CC
DS32kHz
illustrates how a standard 32.768kHz crystal and the DS32kHz should be connected to address the
Vbat
V
DS32kHz
4.5V - 5.5V
CC
GND
GND
Vcc
CC
A
and I
1MΩ
BAT
R1
32.768kHz out
currents are specified with no output loads. Many RTC oscillator circuits use a quartz
100pF
32kHz out
C1
33kΩ
R2
2.7V - 5.5V
X1
X2
RTC
32.768 Hz
V
CC
Vbat
GND
GND
Vcc
B
V
X1 or Xin
X2 or Xout
BAT
7 of 8
RTC
32.768kHz out
V
V
BAT
CC
Vbat
4.5V - 5.5V
GND
GND
Vcc
Figure 6
C
shows one circuit that
32.768kHz out
CC
and