+3V to +5.5V RS-232 Transceivers
with AutoShutdown
MAX3221/MAX3223/MAX3243
Typical Operating Characteristics
(V
= +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ, T = +25°C, unless otherwise noted.)
A
CC
MAX3221/MAX3223
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3221/MAX3223
SUPPLY CURRENT vs. LOAD CAPACITANCE
MAX3221/MAX3223
SLEW RATE
vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA
MAX3221/3223-03
6
5
4
3
2
1
0
22
20
18
16
40
35
35
30
V
OUT+
235kbps
30
25
20
15
25
20
15
10
14
12
10
8
-SLEW
120kbps
20kbps
-1
+SLEW
-2
-3
-4
-5
-6
6
4
2
0
FOR DATA RATES UP TO 235kbps
V
OUT-
10
5
5
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
150 500 1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3243
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3243
SUPPLY CURRENT vs. LOAD
CAPACITANCE WHEN TRANSMITTING DATA
MAX3243
SLEW RATE
vs. LOAD CAPACITANCE
7.5
45
40
35
30
24
22
235kbps
V
+
OUT
5.0
2.5
0
20
18
16
120kbps
20kbps
-SLEW
+SLEW
1 TRANSMITTER AT 235kbps
2 TRANSMITTERS AT 30kbps
25
20
15
10
5
14
12
10
-2.5
-5.0
-7.5
V
-
OUT
8
ALL OUTPUTS LOADED WITH 3kΩ +C
0.1μF CHARGE-PUMP CAPACITORS
FOR ALL DATA RATES UP TO 235kbps
L
6
4
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
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