GD75323
MULTIPLE RS-232 DRIVERS AND RECEIVERS
SLLS213A – JANUARY 1996 – REVISED JUNE 1999
PARAMETER MEASUREMENT INFORMATION
3 V
0 V
1.5 V
1.5 V
Input
V
Input
DD
V
CC
t
t
PHL
PLH
90%
Pulse
Generator
V
O
V
V
OH
C
L
R
90%
L
See Note B
(see Note A)
50%
10%
50%
10%
Output
OL
V
SS
t
t
TLH
THL
TEST CIRCUIT
C includes probe and jig capacitance.
L
VOLTAGE WAVEFORMS
NOTES: A.
B. The pulse generator has the following characteristics: t = 25 µs, PRR = 20 kHz, Z = 50 Ω, t = t < 50 ns.
w
O
r
f
Figure 3. Driver Test Circuit and Voltage Waveforms
V
DD
V
CC
V
DD
V
–I
OS
CC
–I
OH
V , V
IT
I
V
OH
V
I
V
OL
I
OL
V
SS
V
SS
Figure 4. Receiver Test Circuit for I
Figure 5. Receiver Test Circuit
OS
for V , V , and V
IT OH
OL
5 V
50%
90%
50%
Input
V
DD
–5 V
Input
V
CC
t
t
PHL
PLH
90%
Pulse
Generator
V
O
V
V
C
OH
L
R
L
See Note B
(see Note A)
50%
10%
50%
10%
Output
OL
V
SS
t
t
TLH
THL
TEST CIRCUIT
C includes probe and jig capacitance.
L
VOLTAGE WAVEFORMS
NOTES: A.
B. The pulse generator has the following characteristics: t = 25 µs, PRR = 20 kHz, Z = 50 Ω, t = t < 50 ns.
w
O
r
f
Figure 6. Receiver Propagation and Transition Times
7
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