SP312ECT

Manufacturer Part NumberSP312ECT
ManufacturerExar Corporation
SP312ECT datasheets

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Shutdown (SD) and Enable (EN) for the and

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+10V
+
a) C
2
GND
GND
–
b) C
2
–10V
Figure 6. Charge Pump Waveforms
be symmetrical. Older charge pump approaches
–
+
that generate V
from V
will show a decrease in
–
the magnitude of V
compared to 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.
V
CC
+
C
1
–
–5V
Figure 7. Charge Pump — Phase 3
V
= +5V
CC
+
C
1
–
Figure 8. Charge Pump — Phase 4
Date: 7/19/04
Shutdown (SD) and Enable (EN) for the
SP310E and SP312E
+
due to the
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
= +5V
C
+5V
4
+
–
V
Storage Capacitor
DD
+
C
2
–
+
–
V
Storage Capacitor
SS
C
–5V
3
C
+10V
4
+
–
V
Storage Capacitor
DD
+
C
2
–
+
–
V
Storage Capacitor
SS
C
3
SP202E Series High Performance RS232 Transceivers
7
© Copyright 2004 Sipex Corporation

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