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