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参数资料
| 型号： | DS32KHZ/WBGA/T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC TCXO 32.768KHZ COM 36-BGA |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | DS |
| 类型： | TCXO |
| 频率： | 32.768kHz |
| 输出： | CMOS |
| 电源电压： | 5V |
| 频率稳定性： | ±7.5ppm |
| 工作温度： | 0°C ~ 70°C |
| 电流 - 电源（最大）： | 220µA |
| 安装类型： | 表面贴装 |
| 尺寸/尺寸： | 0.450" L x 0.400" W（11.43mm x 10.16mm） |
| 高度： | 0.101"（2.56mm） |
| 封装/外壳： | 36-BGA |
| 包装： | 标准包装 |
| 其它名称： | DS32KHZ/WBGA/DKR |
DS32kHz
Figure 4. Power-Supply Connections
4.5V - 5.5V
4.5V - 5.5V
Vcc
Vcc
Vcc
2.7V - 3.3V
Vbat
32.768kHz out
2.7V - 5.5V
Vbat
32.768kHz out
Vbat
32.768kHz out
GND
A
GND
B
GND
C
Figure 5 illustrates how a standard 32.768kHz crystal and the DS32kHz should be connected to address the
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 CC and I BAT currents are specified with no output loads. Many RTC oscillator circuits use a quartz
crystal or resonator. Driving the oscillator circuit with the rail-to-rail output of the DS32kHz can increase the I CC and
I BAT currents significantly and increase the current consumption of the RTC as well. Figure 6 shows one circuit that
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 1.0M Ω 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 33k Ω .
Figure 5. DS32kHz Connections
V CC
32kHz out
X1 or Xin
V CC
V BAT
DS32kHz
32.768 Hz
RTC
X2 or Xout
V BAT
A PC board can be laid out so that the RTC can use either the DS32kHz or a crystal
Figure 6. DS32kHz and RTC Connections
V CC
R1
1M Ω
C1
100pF
V CC
V BAT
DS32kHz
R2
33k Ω
X1
X2
RTC
V BAT
7 of 8
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