Datasheet

11
10
8
1
2
3
4
7
ROUT2
DIN2
9
RIN1
16
13
12
15
14
DIN1
5
6
+
–
V
CC
GND
ROUT1
+
–
CBYPASS
=0.1 F,m
+
–
+
–
RIN2
+
–
DOUT1
DOUT2
†
C3canbeconnectedtoV orGND.
CC
NOTES: A .Resistorvaluesshownarenominal.
C2+
C2–
C1+
C1–
V+
V–
C1
0.1 F,m
6.3V
C3
†
0.1 Fm
16V
C2
0.1 F,m
16V
5kW
5kW
C4
0.1 Fm ,
16V
B.Nonpolarizedceramiccapacitorsareacceptable.Ifpolarizedtantalumorelectrolyticcapacitorsareused,theyshouldbe
connectedasshown.
TRS202E
www.ti.com SLLS847D –JULY 2007–REVISED NOVEMBER 2012
APPLICATION INFORMATION
Figure 5. Typical Operating Circuit and Capacitor Values
Capacitor Selection
The capacitor type used for C1-C4 is not critical for proper operation. The TRS202E requires 0.1-μF capacitors,
although capacitors up to 10 μF can be used without harm. Ceramic dielectrics are suggested for the 0.1-μF
capacitors. When using the minimum recommended capacitor values, make sure the capacitance value does not
degrade excessively as the operating temperature varies. If in doubt, use capacitors with a larger (e.g., 2×)
nominal value. The capacitors' effective series resistance (ESR), which usually rises at low temperatures,
influences the amount of ripple on V+ and V–.
Use larger capacitors (up to 10 μF) to reduce the output impedance at V+ and V–.
Bypass V
CC
to ground with at least 0.1 μF. In applications sensitive to power-supply noise generated by the
charge pumps, decouple V
CC
to ground with a capacitor the same size as (or larger than) the charge-pump
capacitors (C1–C4).
ESD Protection
TI TRS202E devices have standard ESD protection structures incorporated on the pins to protect against
electrostatic discharges encountered during assembly and handling. In addition, the RS232 bus pins (driver
outputs and receiver inputs) of these devices have an extra level of ESD protection. Advanced ESD structures
were designed to successfully protect these bus pins against ESD discharge of ±15-kV when powered down.
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