1µA Supply-Current, True +3V to +5.5V
RS-232 Transceivers with AutoShutdown
MAX3221/MAX3223/MAX3243
__________________________________________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
MAX3223 SUPPLY CURRENT (mA)
20
18
SLEW RATE (V/µs)
16
14
12
10
8
6
4
2
+SLEW
-SLEW
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
4
3
2
1
0
-1
-2
-3
-4
-5
-6
0
1000
2000
3000
4000
V
OUT-
30
FOR DATA RATES UP TO 235kbps
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
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
5
0
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
20kbps
120kbps
235kbps
MAX3221/3223-06
7.5
TRANSMITTER OUTPUT VOLTAGE (V)
V
OUT
+
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
-SLEW
45
1 TRANSMITTER AT 235kbps
2 TRANSMITTERS AT 30kbps
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
4
_______________________________________________________________________________________
MAX3221 SUPPLY CURRENT (mA)
6
5
TRANSMITTER OUTPUT VOLTAGE (V)
22
35
V
OUT+
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
