MAX3243
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS350B – APRIL 1999 – REVISED JANUARY 2000
PARAMETER MEASUREMENT INFORMATION
3 V
0 V
Input
1.5 V
1.5 V
RS-232
Output
Generator
(see Note B)
50 Ω
C
t
t
L
PHL
PLH
R
L
(see Note A)
V
V
OH
3 V
FORCEOFF
50%
50%
Output
OL
TEST CIRCUIT
C includes probe and jig capacitance.
L
VOLTAGE WAVEFORMS
NOTES: A.
B. The pulse generator has the following characteristics: PRR = 250 kbit/s, Z = 50 Ω, 50% duty cycle, t ≤ 10 ns, t ≤ 10 ns.
O
r
f
Figure 2. Driver Pulse Skew
3 V or 0 V
FORCEON
3 V
–3 V
Input
1.5 V
1.5 V
Output
Generator
(see Note B)
t
t
PLH
PHL
50 Ω
C
L
(see Note A)
3 V
V
V
OH
FORCEOFF
50%
50%
Output
OL
TEST CIRCUIT
C includes probe and jig capacitance.
L
VOLTAGE WAVEFORMS
NOTES: A.
B. The pulse generator has the following characteristics: Z = 50 Ω, 50% duty cycle, t ≤ 10 ns, t ≤ 10 ns.
O
r
f
Figure 3. Receiver Propagation Delay Times
3 V
Input
1.5 V
1.5 V
V
CC
S1
GND
–3 V
3 V or 0 V
FORCEON
t
t
PHZ
PZH
(S1 at GND)
(S1 at GND)
R
L
V
OH
3 V or 0 V
Output
50%
Output
0.3 V
C
L
(see Note A)
FORCEOFF
50 Ω
t
t
PLZ
(S1 at V
PZL
(S1 at V
)
)
CC
CC
Generator
(see Note B)
0.3 V
Output
50%
V
OL
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A.
C includes probe and jig capacitance.
L
B. The pulse generator has the following characteristics: Z = 50 Ω, 50% duty cycle, t ≤ 10 ns, t ≤ 10 ns.
O
r
f
C.
D.
t
t
and t
and t
are the same as t
are the same as t
.
dis
en
PLZ
PZL
PHZ
PZH
.
Figure 4. Receiver Enable and Disable Times
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
