tWU

VCC

0

0

V+

V−

VCC

0

Driver

Inputs

Receiver

Inputs

}

INVALID

Output

Driver

Outputs

VCC

Invalid

Region

Ready

Output

tINVH

tWU

tINVL

VOLTAGE WAVEFORMS

TEST CIRCUIT

50

Ω

Generator

(see Note B)

ROUT

Auto-Power-

Down Plus

INVALID

DOUT

DIN

CL = 30 pF

(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

µs, INVALID Is Low†

Valid RS-232 Level, INVALID High

† Auto power down disables drivers and reduces supply

current to 1

µA.

FORCEON

FORCEOFF

MAX3318

SLLS687A – OCTOBER 2005 – REVISED OCTOBER 2013

www.ti.com

PARAMETER MEASUREMENT INFORMATION

Figure 4. INVALID Propagation Delay Times and Supply Enabling Time

8

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