GD75232
MULTIPLE RS-232 DRIVERS AND RECEIVERS
SLLS206C – MAY 1995 – REVISED JULY 1998
PARAMETER MEASUREMENT INFORMATION
VDD
VCC
VI
VSS
Figure 4. Receiver Test Circuit for I
OS
VDD
VCC
VIT, VI
VOL
VSS
IOL
– IOH
VOH
Figure 5. Receiver Test Circuit for V
IT
, V
OH
, and V
OL
4V
VDD
Input
Pulse
Generator
See Note A
VSS
TEST CIRCUIT
t THL
VOLTAGE WAVEFORMS
NOTES: A.
B.
The pulse generator has the following characteristics: tw = 25
µs,
PRR = 20 kHz, ZO = 50
Ω,
tr = tf < 50 ns.
CL includes probe and jig capacitance.
RL
VCC
t PHL
CL
(see Note B)
Output
90%
t PLH
90%
VOH
VOL
t TLH
Input
50%
50%
0V
50%
10%
50%
10%
Figure 6. Receiver Propagation and Transition Times
8
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
