SN75196

MULTIPLE RS-232 DRIVERS AND RECEIVERS

SLLS188B – MAY 1995 – REVISED APRIL 1998

7

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

IOS(L)

–IOS(H)

VSS

VDD

VCC

VI

VO

VDD or GND

VSS or GND

RL = 3 kΩ

Figure 1. Driver Test Circuit for VOH, VOL, IOS(H), and IOS(L)

–IIL

IIH

VSS

VDD

VCC

VI

VI

Figure 2. Driver Test Circuit for IIH and IIL

Pulse

Generator

See Note A

CL

(see Note B)

RL

3 V

0 V

1.5 V

1.5 V

Input

tPHL

tPLH

90%

50%

10%

50%

10%

90%

tTHL

tTLH

VOH

VOL

TEST CIRCUIT

VOLTAGE WAVEFORMS

Input

Output

VSS

VCC

VDD

VO

NOTES: A.

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

B.

CL includes probe and jig capacitance.

Figure 3. Driver Test Circuit and Voltage Waveforms