+
–
Since both V and V are separately generated
The clock rate for the charge pump typically
operatesat250kHz. Theexternalcapacitorscan
be as low as 0.1µF with a 16V breakdown
voltage rating.
+
–
from VCC, in a no–load condition V and V will
besymmetrical. Olderchargepumpapproaches
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.
–
+
–
+
S
H
U
T
+2.7V
0V
-2.7V
RECEIVER
RS-232 INPUT
VOLTAGES
D
O
W
N
V
CC
STATUS
0V
t
STSL
t
STSH
t
ONLINE
+5V
DRIVER
RS-232 OUTPUT
VOLTAGES
0V
-5V
Figure 20. AUTO ON-LINE® Timing Waveforms
Date: 6/2/04
SP3223EB/3243EB +3.0V to +5.5V RS-232 Transceivers
© Copyright 2004 Sipex Corporation
13
SIPEX [ SIPEX CORPORATION ]
