MAX3223

3V TO 5.5V MULTICHANNEL RS232 LINE DRIVER/RECEIVER

WITH ±15kV ESD PROTECTION

SLLS409K − JANUARY 2000 − REVISED MARCH 2004

8

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

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)

NOTES: A. CL includes probe and jig capacitance.

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

50%

50%

1.5 V

1.5 V

Figure 2. Driver Pulse Skew

TEST CIRCUIT

VOLTAGE WAVEFORMS

50

Ω

50%

50%

−3 V

3 V

1.5 V

1.5 V

Output

Input

VOL

VOH

tPHL

Generator

(see Note B)

tPLH

Output

EN

0 V

CL

(see Note A)

NOTES: 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.

0 V

FORCEOFF

Figure 3. Receiver Propagation Delay Times

TEST CIRCUIT

VOLTAGE WAVEFORMS

50

Ω

Generator

(see Note B)

3 V or 0 V

Output

VOL

VOH

tPHZ

(S1 at GND)

tPLZ

(S1 at VCC)

tPZL

(S1 at VCC)

1.5 V

1.5 V

3 V

0 V

50%

0.3 V

Output

Input

50%

0.3 V

EN

FORCEON

3 V or 0 V

RL

S1

VCC

GND

CL

(see Note A)

Output

NOTES: 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.

tPHZ

(S1 at GND)

Figure 4. Receiver Enable and Disable Times