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TEST CIRCUIT

50

Ω

Generator

(see Note B)

FORCEOFF

ROUT

FORCEON

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

supply current to 1

µA.

B. The pulse generator has the following

−2.7 V

Receiver

Input

−3 V

3 V

2.7 V

0 V

INVALID

Output

3 V to 5 V

50%

50%

0 V

0 V

0 V

50%

50%

Driver

Input

≈5.5 V

Driver

Output

≈ −5.5 V

Supply

Voltages

V+

V−

V+ −0.3 V

V− +0.3 V

Voltage Waveforms and Timing Diagrams

V+

V−

SN65C3238E

,, SN75C3238E

3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVERS/RECEIVERS

WITH

±15-kV ESD (HBM) PROTECTION

SLLS726 – MAY 2006

PARAMETER MEASUREMENT INFORMATION (continued)

Figure 5. INVALID Propagation-Delay Times and Supply-Enabling Time

11

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