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SP232ECN Datasheet(PDF) 7 Page - Sipex Corporation

Part # SP232ECN
Description  High-Performance RS-232 Line Drivers/Receivers
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP232ECN Datasheet(HTML) 7 Page - Sipex Corporation

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Rev. 06/20/02
SP202E Series High Performance RS232 Transceivers
© Copyright 2002 Sipex Corporation
7
Figure 6. Charge Pump Waveforms
+10V
a) C
2
+
GND
GND
b) C
2
–
–10V
Figure 7. Charge Pump — Phase 3
VCC = +5V
–5V
+5V
–5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
+
++
–
–
–
–
Figure 8. Charge Pump — Phase 4
VCC = +5V
+10V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
+
++
–
–
–
–
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 capacitors can
be as low as 0.1
µF with a 16V breakdown
voltage rating.
Shutdown (SD) and Enable (EN) for the
SP310E and SP312E
Both the SP310E and SP312E have a shutdown/
standby mode to conserve power in battery-pow-
ered systems. To activate the shutdown mode,
which stops the operation of the charge pump, a
logic “0” is applied to the appropriate control line.
For the SP310E, this control line is ON/OFF (pin
18). Activating the shutdown mode also puts the


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