参数资料
| 型号： | PT7C43390WEX |
| 厂商： | Pericom |
| 文件页数： | 14/23页 |
| 文件大小： | 0K |
| 描述： | IC REAL TIME CLOCK 8SOIC |
| 标准包装： | 1 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出 |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.3 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.1 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 标准包装 |
| 其它名称： | PT7C43390WEXDKR |
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PT0280(08/09)
Ver: 3
21
Data Sheet
PT7C43390
2-Wire Real-time Clock Module
Recommended Layout for Crystal
Built-in Capacitors Specifications and Recommended External Capacitors
Parameter
Symbol
Typ
Unit
X1 to GND
CG
5
pF
Build-in capacitors
X2 to GND
CD
5
pF
X1 to GND
C1
18
pF
Recommended External capacitors for
crystal CL=12.5pF
X2 to GND
C2
18
pF
X1 to GND
C1
7
pF
Recommended External capacitors for
crystal CL=6pF
X2 to GND
C2
7
pF
Note: The frequency of crystal can be optimized by external capacitor C1 and C2, for frequency=32.768Hz, C1 and C2 should meet
the equation as below:
Cpar + [(C1+CG)*(C2+CD)]/ [(C1+CG)+(C2+CD)] =CL
Cpar is all parasitical capacitor between X1 and X2.
CL is crystal’s load capacitance.
Crystal Specifications
Parameter
Symbol
Min
Typ
Max
Unit
Nominal Frequency
fO
-
32.768
-
kHz
Series Resistance
ESR
-
70
k
Load Capacitance
CL
-
6/12.5
-
pF
Note: The crystal, traces and crystal input pins
should be isolated from RF generating signals.
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