SP3223E Datasheet, PDF (13/24 Pages) Sipex Corporation – Intelligent +3.0V to +5.5V RS-232 Transceivers

Since both V⁺ and V^– are separately generated
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 250kHz. The external capacitors can
be as low as 0.1µF with a 16V breakdown
voltage rating.
RECEIVER ^+2.7V
RS-232 INPUT ^0V
VOLTAGES -2.7V
VCC
STATUS
0V
+5V
DRIVER
RS-232 OUTPUT _0V
VOLTAGES
-5V
S
H
U
T
D
O
W
N
tSTSL
tSTSH
tONLINE
Figure 15. AUTO ON-LINE^® Timing Waveforms
Rev. 11/14/02
SP3223E +3.0V to +5.5V RS-232 Transceivers
13
© Copyright 2002 Sipex Corporation