+5V-Powered, Multichannel RS-232
Drivers/Receivers
MAX220–MAX249
__________________________________________Typical Operating Characteristics
MAX225/MAX244–MAX249
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
MAX220-10
OUTPUT VOLTAGE
vs. LOAD CURRENT FOR V+ AND V-
MAX220-11
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
8.5
8.0
V+, V- (V)
7.5
7.0
6.5
V
CC
= +5V WITH ALL TRANSMITTERS DRIVEN
LOADED WITH 5kΩ
10kb/s
20kb/s
40kb/s
60kb/s
MAX220-12
18
TRANSMITTER SLEW RATE (V/μs)
16
14
12
10
8
6
4
2
0
1
2
3
4
5
LOAD CAPACITANCE (nF)
V
CC
= +5V
10
8
6
OUTPUT VOLTAGE (V)
V+ AND V- LOADED
V
CC
= +5V
EXTERNAL CHARGE PUMP
1μF CAPACITORS
8 TRANSMITTERS
DRIVING 5kΩ AND
2000pF AT 20kb/s
V+ AND V- LOADED
EITHER V+ OR
V- LOADED
9.0
EXTERNAL POWER SUPPLY
1μF CAPACITORS
40kb/s DATA RATE
8 TRANSMITTERS
LOADED WITH 3kΩ
4
2
0
-2
-4
-6
-8
-10
0
V- LOADED
6.0
5.5
V+ LOADED
5
10
15
20
25
30
35
5.0
0
1
200kb/s
ALL CAPACITIORS 1μF
2
3
4
5
100kb/s
LOAD CURRENT (mA)
LOAD CAPACITANCE (nF)
10
______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
