+5V-Powered, Multichannel RS-232
Drivers/Receivers
+3V
0V*
50%
50%
50%
+3V
INPUT
INPUT
0V
V
CC
OUTPUT
50%
GND
V+
0V
V-
OUTPUT
t
t
t
t
PHLR
PHLS
PLHR
PLHS
t
t
PHLT
PLHT
*EXCEPT FOR R2 ON THE MAX243
WHERE -3V IS USED.
Figure 1. Transmitter Propagation-Delay Timing
Figure 2. Receiver Propagation-Delay Timing
EN
1k
R OUT
X
R
V
- 2V
X
R IN
X
CC
+3V
SHDN
0V
a) TEST CIRCUIT
150pF
0V
OUTPUT DISABLE TIME (t
)
DT
+3V
EN INPUT
V+
+5V
EN
0V
OUTPUT ENABLE TIME (t
)
ER
-5V
+3.5V
V-
RECEIVER
OUTPUTS
+0.8V
a) TIMING DIAGRAM
b) ENABLE TIMING
+3V
EN
T
X
1 OR 0
0V
EN INPUT
50pF
3k
OUTPUT DISABLE TIME (t
)
DR
V
OH
V
OH
- 0.5V
RECEIVER
OUTPUTS
V
- 2V
CC
b) TEST CIRCUIT
V
+ 0.5V
OL
V
OL
c) DISABLE TIMING
Figure 3. Receiver-Output Enable and Disable Timing
______________________________________________________________________________________ 11
Figure 4. Transmitter-Output Disable Timing
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
