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PARAMETER MEASUREMENT INFORMATION (continued)

VCC

0

0

V+

V−

VCC

0

Transmitter

Inputs

Receiver

Inputs

}

INVALID

Output

Transmitter

Outputs

VCC

Invalid

Region

Output

TEST CIRCUIT

50

Ω

Generator

(see Note B)

ROUT

Auto-Powerdown

Plus

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

TRS3227

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

WITH

±15-kV ESD PROTECTION

SLLS821 – JULY 2007

Figure 4. INVALID Propagation Delay Times and Driver Enabling Time

9

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