参数资料
| 型号： | SP332ET-L |
| 厂商： | Exar Corporation |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232/485 SRL 28WSOIC |
| 标准包装： | 27 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 4/4 |
| 规程： | RS232，RS485 |
| 电源电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
| 其它名称： | 1016-1519-5 SP332ET-L-ND |
7
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP332_00_0260
Since both V+ and V– are separately gen-
erated from V
CC in a no–load condition, V+
and V– will be symmetrical. Older charge
pump approaches that generate V– from
V+ will show a decrease in the magnitude
of V– compared to V+ due to the inherent
inefficiencies in the design.
The clock rate for the charge pump typically
operates at 15kHz. The external capaci-
tors must be 0.1F with a 16V breakdown
rating.
Phase 3
— V
DD charge storage — The third phase
of the clock is identical to the first phase
— the charge transferred in C
produces
–5V in the negative terminal of C
, which
is applied to the negative side of capacitor
C
2. Since C2
+
is at +5V, the voltage potential
across C
2 is l0V.
Phase 4
— V
DD transfer — The fourth phase of the
clock connects the negative terminal of C
2
to ground and transfers the generated l0V
across C
2 to C4, the VDD storage capacitor.
Again, simultaneously with this, the positive
side of capacitor C
is switched to +5V and
the negative side is connected to ground,
and the cycle begins again.
+10V
GND
-10V
a) C2+
b) C2-
Figure 7. Charge Pump Waveforms
VCC = +5V
–5V
+5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
Figure 8. Charge Pump Phase 1.
VCC = +5V
–10V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
Figure 10. Charge Pump Phase 2.
VCC = +5V
–5V
+5V
–5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
Figure 9. Charge Pump Phase 3.
VCC = +5V
+10V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
Figure 11. Charge Pump Phase 4.
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PDF描述 |
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| SP334ET-L | IC TXRX RS232/485 PROG 28WSOIC |
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| SP338EER1-L | IC INTERFACE |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP332ET-L/TR | 功能描述:RS-232接口集成电路 RS-232/RS-485 Multi-Mode Serial RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| SP332K | 制造商:Cornell Dubilier Electronics 功能描述: 制造商:Mallory Sonalert Products Inc 功能描述: |
| SP332-R4 | 制造商:Leviton Manufacturing Co 功能描述: |
| SP332-R6 | 制造商:Leviton Manufacturing Co 功能描述: |
| SP333 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:+5V Only RS-232/AppleTalk⑩ Programmable Transceiver |
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