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SP3243B Datasheet(PDF) 13 Page - Sipex Corporation

Part # SP3243B
Description  Intelligent 3.0V to 5.5V RS-232 Transceivers
PDF  24 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP3243B Datasheet(HTML) 13 Page - Sipex Corporation

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Rev. 6/30/03
SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers
© Copyright 2003 Sipex Corporation
Since both V+ and V– are separately generated
from VCC, 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.
Figure 20. AUTO ON-LINE® Timing Waveforms
RECEIVER
RS-232 INPUT
VOLTAGES
STATUS
+5V
0V
-5V
tSTSL
tSTSH
tONLINE
VCC
0V
DRIVER
RS-232 OUTPUT
VOLTAGES
0V
+2.7V
-2.7V
S
H
U
T
D
O
W
N
The clock rate for the charge pump typically
operates at 250kHz. The external capacitors can
be as low as 0.1
µF with a 16V breakdown
voltage rating.



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