+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/sec
20kb/sec
40kb/sec
60kb/sec
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 20kbits/sec
V+ AND V- LOADED
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
5.0
5
10
15
20
25
30
35
0
LOAD CURRENT (mA)
1
200kb/sec
ALL CAPACITIORS 1µF
2
3
4
5
100kb/sec
LOAD CAPACITANCE (nF)
10
______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
