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SP21111ECT-L Datasheet(PDF) 7 Page - Exar Corporation

Part # SP21111ECT-L
Description  Low Power, High ESD 5V RS-232 Transceivers
Download  19 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

SP21111ECT-L Datasheet(HTML) 7 Page - Exar Corporation

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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP207E_00_072309
The Exar charge-pump generates V+ and V-
independently from V
CC. Hence in a no–load
condition V+ and V- will be symmetrical.
Older charge pump approaches generate
V+ and then use part of that stored charge
to generate V-. Because of inherent losses,
the magnitude of V- will be smaller than V+
on these older designs.
Underlightlyloadedconditionstheintelligent
pump oscillator maximizes efficiency by
running only as needed to maintain V+ and
V-. Since interface transceivers often spend
muchoftheirtimeatidle,thispower-efficient
innovation can greatly reduce total power
consumption. This improvement is made
possiblebytheindependentphasesequence
of the Exar charge-pump design.
The clock rate for the charge pump typically
operates at greater than 5kHz, allowing
thepumptorunefficientlywithsmall0.1µF
capacitors.Efficientoperationdependson
rapidly charging and discharging C
 and
C
2, therefore capacitors should be mounted
close to the IC and have low ESR (equivalent
series resistance). Low cost surface mount
ceramic capacitors (such as are widely used
for power-supply decoupling) are ideal for
use on the charge pump.
However the charge pumps are designed
to be able to function properly with a wide
range of capacitor styles and values. If
polarized capacitors are used, the positive
and negative terminals should be connected
as shown.
Figure 4. Charge Pump — Phase 4
VCC = +5V
+10V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
+
+
+
Voltage potential across any of the capaci-
tors will never exceed 2 x V
CC. Therefore
capacitors with working v
oltages as low as
0V rating may be used with a nominal V
CC
supply. C
 will never see a potential greater
than V
CC , so a working voltage of 6.3V is
adequate. The reference terminal of the
V
DD capacitor may be connected either to
V
CC or ground, but if connected to ground a
minimum 6V working voltage is required.
Higherworkingvoltagesand/orcapacitance
values may be advised if operating at higher
V
CC or to provide greater stability as the
capacitors age.
+10V
a) C
2
+
gND
gND
b) C
2
–10V
Figure 5. Typical waveforms seen on ca-
pacitor C2 when all drivers are at maximum
load.


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