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PARAMETER MEASUREMENT INFORMATION
50 Ω
TEST CIRCUIT VOLTAGE WAVEFORMS
−3 V
−3 V
3 V
3 V
0 V
3 V
Output
Input
V
OL
V
OH
t
TLH
Generator
(see Note B)
R
L
3 V
FORCEOFF
RS-232
Output
t
THL
C
L
(see Note A)
SR(tr) 
6 V
t
THL
or t
TLH
50 Ω
TEST CIRCUIT VOLTAGE WAVEFORMS
0 V
3 V
Output
Input
V
OL
V
OH
t
PLH
Generator
(see Note B)
R
L
3 V
FORCEOFF
RS-232
Output
t
PHL
C
L
(see Note A)
50%
50%
1.5 V
1.5 V
TEST CIRCUIT VOLTAGE WAVEFORMS
50 Ω
−3 V
3 V
Output
Input
V
OL
V
OH
t
PHL
Generator
(see Note B)
t
PLH
Output
C
L
(see Note A)
3 V or 0 V
FORCEON
3 V
FORCEOFF
1.5 V 1.5 V
50% 50%
MAX3238E
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ± 15-kV ESD (HBM) PROTECTION
SLLS710A – FEBRUARY 2006 – REVISED APRIL 2006
A. C
L
includes probe and jig capacitance.
B. The pulse generator has the following characteristics: PRR = 250 kbit/s, Z
O
= 50 Ω , 50% duty cycle, t
r
≤ 10 ns,
t
f
≤ 10 ns.
Figure 1. Driver Slew Rate
A. C
L
includes probe and jig capacitance.
B. The pulse generator has the following characteristics: PRR = 250 kbit/s, Z
O
= 50 Ω , 50% duty cycle, t
r
≤ 10 ns,
t
f
≤ 10 ns.
Figure 2. Driver Pulse Skew
A. C
L
includes probe and jig capacitance.
B. The pulse generator has the following characteristics: Z
O
= 50 Ω , 50% duty cycle, t
r
≤ 10 ns, t
f
≤ 10 ns.
Figure 3. Receiver Propagation Delay Times
9
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