7 Parameter Measurement Information

50

Ω

TEST CIRCUIT

VOLTAGE WAVEFORMS

−3 V

−3 V

3 V

3 V

0 V

3 V

Output

Input

VOL

VOH

tTLH

Generator

(see Note B)

RL

3 V

FORCEOFF

RS-232

Output

tTHL

CL

(see Note A)

SR(tr) =

6 V

t

THL or tTLH

A.

CL includes probe and jig capacitance.

B.

The pulse generator has the following characteristics: PRR = 250 kbps, ZO = 50 Ω, 50% duty cycle, tr ≤ 10 ns, tf ≤ 10 ns.

Figure 7-1. Driver Slew Rate

50

Ω

TEST CIRCUIT

VOLTAGE WAVEFORMS

0 V

3 V

Output

Input

VOL

VOH

tPLH

Generator

(see Note B)

RL

3 V

FORCEOFF

RS-232

Output

tPHL

CL

(see Note A)

50%

50%

1.5 V

1.5 V

A.

CL includes probe and jig capacitance.

B.

The pulse generator has the following characteristics: PRR = 250 kbps, ZO = 50 Ω, 50% duty cycle, tr ≤ 10 ns, tf ≤ 10 ns.

Figure 7-2. Driver Pulse Skew

TEST CIRCUIT

VOLTAGE WAVEFORMS

50

Ω

−3 V

3 V

Output

Input

VOL

VOH

tPHL

Generator

(see Note B)

tPLH

Output

CL

(see Note A)

3 V or 0 V

FORCEON

3 V

FORCEOFF

1.5 V

1.5 V

50%

50%

A.

CL includes probe and jig capacitance.

B.

The pulse generator has the following characteristics: ZO = 50 Ω, 50% duty cycle, tr ≤ 10 ns, tf ≤ 10 ns.

Figure 7-3. Receiver Propagation Delay Times

MAX3221

SLLS348P – JUNE 1999 – REVISED JULY 2021

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