SP310E Sipex, SP310E Datasheet - Page 7

• Manufacturer Part Number: SP310E
• Description: High-Performance RS-232 Line Drivers/Receivers
• Manufacturer: Sipex

Figure 6. Charge Pump Waveforms
that generate V
the magnitude of V
inherent inefficiencies in the design.
The clock rate for the charge pump typically
operates at 15kHz. The external capacitors can
be as low as 0.1µF with a 16V breakdown
voltage rating.
Date: 7/19/04
Figure 7. Charge Pump — Phase 3
Figure 8. Charge Pump — Phase 4
be symmetrical. Older charge pump approaches
b) C
a) C
–
from V
2
2
–
+
–
+10V
GND
–10V
GND
compared to V
C
+
1
will show a decrease in
+
–
C
V
1
CC
–5V
+
–
V
= +5V
CC
= +5V
SP202E Series High Performance RS232 Transceivers
+
C
due to the
2
+10V
+
–
C
2
+5V
–5V
+
–
7
+
–
C
C
4
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
3
+
–
+
–
C
C
4
V
V
3
+
–
DD
SS
V
V
Storage Capacitor
Storage Capacitor
DD
SS
Storage Capacitor
Storage Capacitor
© Copyright 2004 Sipex Corporation