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TESTCIRCUIT

50 Ω

Generator

(seeNoteB)

FORCEOFF

ROUT

FORCEON

Auto-

Powerdown

INVALID

DOUT

DIN

CL =30pF

(seeNote A)

2.7V

−2.7V

0.3V

−0.3V

0V

ValidRS-232Level,INVALID High

Indeterminate

Indeterminate

IfSignalRemainsWithinThisRegion

ForMoreThan30 µs,INVALID IsLow†

ValidRS-232Level,INVALID High

† Auto-powerdown disablesdriversandreducessupply

currentto1 µA.

VOLTAGEWAVEFORMS

3V

2.7V

−2.7V

INVALID

Output

Receiver

Input

tvalid

0V

0V

−3V

VCC

0V

≈

V+

0V

≈

V−

V+

VCC

ten

V−

50%VCC

50%VCC

2.7V

−2.7V

0.3V

0.3V

tinvalid

Supply

Voltages

NOTES: A. C includesprobeandjigcapacitance.

B. Thepulsegeneratorhasthefollowingcharacteristics:PRR=5kbits/s,Z

=50

,50%dutycycle,t

L

O

TRS3221

3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER

WITH

±15-kV ESD PROTECTION

SLLS814 – JULY 2007

PARAMETER MEASUREMENT INFORMATION (continued)

Figure 5. INVALID Propagation Delay Times and Driver Enabling Time

9

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