+5V-Powered, Multichannel
RS-232 Drivers/Receivers
MAX220–MAX249
Typical Operating Characteristics
MAX225/MAX244–MAX249
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
9.0
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
OUTPUT VOLTAGE
vs. LOAD CURRENT FOR V+ AND V-
18
16
14
12
10
8
10
8
V
CC
= +5V WITH ALL TRANSMITTERS DRIVEN
V
CC
= +5V
LOADED WITH 5kΩ
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
V+ AND V- LOADED
10kb/s
6
4
2
EITHER V+ OR
V- LOADED
20kb/s
EXTERNAL POWER SUPPLY
1μF CAPACITORS
V
CC
= +5V
EXTERNAL CHARGE PUMP
1μF CAPACITORS
8 TRANSMITTERS
DRIVING 5kΩ AND
2000pF AT 20kb/s
40kb/s
60kb/s
0
40kb/s DATA RATE
8 TRANSMITTERS
LOADED WITH 3kΩ
-2
V- LOADED
-4
-6
100kb/s
200kb/s
6
4
V+ AND V- LOADED
-8
ALL CAPACITIORS 1μF
V+ LOADED
30 35
2
-10
0
1
2
3
4
5
0
1
2
3
4
5
0
5
10
15
20
25
LOAD CAPACITANCE (nF)
LOAD CAPACITANCE (nF)
LOAD CURRENT (mA)
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