MAX232, MAX232I
DUAL EIA-232 DRIVER/RECEIVER
SLLS047G – FEBRUARY 1989 – REVISED AUGUST 1998
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
10%
10%
tTLH
0.8 (V
t
OH
–V
)
OL
0.8 (V
or
t
–V
)
OL OH
THL
tPLH
VOH
VOL
90%
50%
≤
10 ns
3V
10%
0V
90%
+
TLH
WAVEFORMS
NOTES: A. The pulse generator has the following characteristics: ZO = 50
Ω,
duty cycle
≤
50%.
B. CL includes probe and jig capacitance.
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
VOH
VOL
≤
10 ns
20
µs
tTHL
Output
3V
–3 V
+
t
THL
6 V
or t
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)
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
5
TI [ TEXAS INSTRUMENTS ]
