MAX232, MAX232I
DUAL EIA 232 DRIVERS/RECEIVERS
SLLS047L − FEBRUARY 1989 − REVISED MARCH 2004
PARAMETER MEASUREMENT INFORMATION
Pulse
Generator
(see Note A)
T1IN or T2IN
T1OUT or T2OUT
EIA-232 Output
RL
CL = 10 pF
(see Note B)
TEST CIRCUIT
≤10
ns
Input
10%
90%
50%
5
µs
tPHL
90%
Output
tTHL
SR
+
0.8 (V
10%
10%
tTLH
–V )
0.8 (V
–V
)
OH
OL
OL
OH
or
t
t
TLH
THL
WAVEFORMS
NOTES: A. The pulse generator has the following characteristics: ZO = 50
Ω,
duty cycle
≤
50%.
B. CL includes probe and jig capacitance.
tPLH
VOH
VOL
90%
50%
≤10
ns
3V
10%
0V
90%
Figure 2. Driver Test Circuit and Waveforms for t
PHL
and t
PLH
Measurements (5-µs Input)
Pulse
Generator
(see Note A)
3 kΩ
EIA-232 Output
CL = 2.5 nF
TEST CIRCUIT
≤10
ns
Input
10%
90%
1.5 V
90%
1.5 V
10%
tTLH
3V
−3 V
SR
+
6V
or t
VOH
VOL
≤10
ns
20
µs
tTHL
Output
3V
−3 V
t
THL
TLH
WAVEFORMS
NOTE A:
The pulse generator has the following characteristics: ZO = 50
Ω,
duty cycle
≤
50%.
Figure 3. Test Circuit and Waveforms for t
THL
and t
TLH
Measurements (20-µs Input)
6
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