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APPLICATION INFORMATION

11

10

8

1

2

3

4

7

ROUT2

DIN2

9

RIN1

16

13

12

15

14

DIN1

5

6

+

-

V

CC

C2+

C1+

GND

C1-

ROUT1

C2-

+

-

CBYPASS

=0.1 F,

m

V+

+

-

+

-

RIN2

+

-

DOUT1

DOUT2

†

C3canbeconnectedtoV

orGND.

CC

NOTES: A .Resistorvaluesshownarenominal.

V-

C1

0.1 F,

m

6.3V

C3

†

0.1 F

m

16V

C2

0.1 F,

m

16V

5kW

5kW

C4

0.1 mF,

16V

B.Nonpolarizedceramiccapacitorsareacceptable.Ifpolarizedtantalumorelectrolyticcapacitorsareused,theyshouldbe

connectedasshown.

Capacitor Selection

Electrostatic Discharge (ESD) Protection

TRS202

5-V DUAL RS-232 LINE DRIVER/RECEIVER

WITH

±15-kV ESD PROTECTION

SLLS808 – JULY 2007

Figure 4. Typical Operating Circuit and Capacitor Values

The capacitor type used for C1–C4 is not critical for proper operation. The TRS202 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–.

capacitors (C1–C4).

TI TRS202 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.

7

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