MAX3221/MAX3223/MAX3243
+3V to +5.5V RS-232 Transceivers
with AutoShutdown
Typical Operating Characteristics
(V
CC
= +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ, T
A
= +25°C, unless otherwise noted.)
MAX3221/MAX3223
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3221/3223-01
MAX3221/MAX3223
SLEW RATE
vs. LOAD CAPACITANCE
20
18
SLEW RATE (V/μs)
16
12
10
8
6
4
2
+SLEW
-SLEW
CU
14
MAX3221/3223-02
MAX3221/MAX3223
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA
40
35
235kbps
30
25
20
15
10
5
20kbps
120kbps
25
20
15
10
5
0
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
)
MAX3221/3223-03
6
5
TRANSMITTER OUTPUT VOLTAGE (V)
4
3
2
1
0
-1
-2
-3
-4
-5
-6
0
1000
2000
3000
22
35
MAX3221 SUPPLY CURRENT (mA)
30
V
OUT+
V
OUT-
FOR DATA RATES UP TO 235kbps
4000
5000
0
150 500 1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3243
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3221/3223-04
3 3 SU
(
MAX3243
SLEW RATE
vs. LOAD CAPACITANCE
MAX3221/3223-05
MAX3243
SUPPLY CURRENT vs. LOAD
CAPACITANCE WHEN TRANSMITTING DATA
40
SUPPLY CURRENT (mA)
35
30
25
20
15
10
20kbps
120kbps
235kbps
MAX3221/3223-06
7.5
V
OUT
+
TRANSMITTER OUTPUT VOLTAGE (V)
5.0
2.5
0
-2.5
-5.0
-7.5
0
1000
2000
3000
4000
V
OUT
-
24
22
20
SLEW RATE (V/μs)
18
16
14
12
10
8
6
4
+SLEW
ALL OUTPUTS LOADED WITH 3kΩ +C
L
0.1μF CHARGE-PUMP CAPACITORS
FOR ALL DATA RATES UP TO 235kbps
0
1000
2000
3000
4000
45
1 TRANSMITTER AT 235kbps
2 TRANSMITTERS AT 30kbps
-SLEW
5
0
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
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