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PARAMETER MEASUREMENT INFORMATION

TEST CIRCUIT

50

Ω

Generator

(see Note B)

FORCEOFF

ROUT

FORCEON

Auto-

powerdown

INVALID

DOUT

DIN

(see Note A)

2.7 V

−2.7 V

0.3 V

−0.3 V

0 V

Valid RS-232 Level, INVALID High

Indeterminate

Indeterminate

If Signal Remains Within This Region

For More Than 30

Valid RS-232 Level, INVALID High

current to 1

µA.

VOLTAGE WAVEFORMS

3 V

2.7 V

−2.7 V

INVALID

Output

Receiver

Input

0 V

0 V

−3 V

0 V

≈V+

0 V

≈V−

V+

V−

2.7 V

−2.7 V

0.3 V

0.3 V

Supply

Voltages

EN = GND

MAX3221E

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

WITH 15-kV IEC ESD PROTECTION

SLLS686A – OCTOBER 2005 – REVISED MAY 2006

Figure 5. INVALID Propagation Delay Times and Driver Enabling Time

9

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