TL145406

TRIPLE RS-232 DRIVERS/RECEIVERS

SLLS185D – DECEMBER 1994 – REVISED JULY 2001

7

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

Pulse

Generator

(see Note B)

CL

(see Note A)

RL

3 V

0

Input

tPHL

tPLH

90%

50%

10%

50%

10%

90%

tTHL

tTLH

VOH

VOL

TEST CIRCUIT

VOLTAGE WAVEFORMS

Input

Output

VSS

VCC

VDD

NOTES: A. CL includes probe and jig capacitance.

B. The pulse generator has the following characteristics: tw = 25 µs, PRR = 20 kHz, ZO = 50 Ω, tr = tf < 50 ns.

1.5 V

1.5 V

Figure 3. Driver Test Circuit and Voltage Waveforms

VI

VDD

VCC

VSS

–IOS

Figure 5. Receiver Test Circuit

VIT,

VI

VDD

VCC

VSS

IOL

VOH

–IOH

VOL

TEST CIRCUIT

NOTES: A. CL includes probe and jig capacitance.

B. The pulse generator has the following characteristics: tw = 25 µs, PRR = 20 kHz, ZO = 50 Ω, tr = tf < 50 ns.

Pulse

Generator

(see Note B)

CL

(see Note A)

RL

Input

VSS

VCC

VDD

VOLTAGE WAVEFORMS

4 V

0

Input

tPHL

tPLH

90%

50%

10%

50%

10%

90%

tTHL

tTLH

VOH

VOL

Output

50%

50%

Figure 6. Receiver Propagation and Transition Times