MAX3221
3 V TO 5.5 V SINGLE CHANNEL RS 232 LINE DRIVER/RECEIVER
WITH
±15
kV ESD PROTECTION
SLLS348M − JUNE 1999 − REVISED MARCH 2004
PARAMETER MEASUREMENT INFORMATION
3V
RS-232
Output
50
Ω
RL
3V
FORCEOFF
TEST CIRCUIT
CL
(see Note A)
Output
6V
SR(tr)
+
t
THL
or t
TLH
Input
0V
tTHL
3V
−3 V
3V
−3 V
tTLH
VOH
VOL
Generator
(see Note B)
VOLTAGE WAVEFORMS
NOTES: A. CL includes probe and jig capacitance.
B. The pulse generator has the following characteristics: PRR = 250 kbit/s, ZO = 50
Ω,
50% duty cycle, tr
≤
10 ns, tf
≤
10 ns.
Figure 1. Driver Slew Rate
3V
RS-232
Output
50
Ω
RL
3V
FORCEOFF
TEST CIRCUIT
CL
(see Note A)
Output
Input
1.5 V
1.5 V
0V
tPHL
50%
VOLTAGE WAVEFORMS
tPLH
VOH
50%
VOL
Generator
(see Note B)
NOTES: A. CL includes probe and jig capacitance.
B. The pulse generator has the following characteristics: PRR = 250 kbit/s, ZO = 50
Ω,
50% duty cycle, tr
≤
10 ns, tf
≤
10 ns.
Figure 2. Driver Pulse Skew
3 V or 0 V
FORCEON
Output
Generator
(see Note B)
50
Ω
3V
FORCEOFF
CL
(see Note A)
Input
3V
1.5 V
1.5 V
−3 V
tPHL
tPLH
VOH
Output
50%
VOLTAGE WAVEFORMS
50%
VOL
TEST CIRCUIT
NOTES: A. CL includes probe and jig capacitance.
B. The pulse generator has the following characteristics: ZO = 50
Ω,
50% duty cycle, tr
≤
10 ns, tf
≤
10 ns.
Figure 3. Receiver Propagation Delay Times
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
7
TI [ TEXAS INSTRUMENTS ]
