Datasheet

MAX3221/MAX3223/MAX3243
1µA Supply-Current, True +3V to +5.5V
RS-232 Transceivers with AutoShutdown
4 _______________________________________________________________________________________
__________________________________________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.)
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
0
MAX3221/MAX3223
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3221/3223-01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
2000 30001000 4000 5000
V
OUT+
V
OUT-
0
2
4
6
8
10
12
14
16
18
20
22
150 500
MAX3221/MAX3223
SLEW RATE
vs. LOAD CAPACITANCE
MAX3221/3223-02
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
2000 30001000 4000 5000
FOR DATA RATES UP TO 235kbps
+SLEW
-SLEW
5
10
15
20
25
30
35
40
0
5
10
15
20
25
30
35
0
MAX3221/MAX3223
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA
MAX3221/3223-03
LOAD CAPACITANCE (pF)
MAX3223 SUPPLY CURRENT (mA) MAX3221 SUPPLY CURRENT (mA)
2000 30001000 4000 5000
235kbps
120kbps
20kbps
-7.5
-5.0
-2.5
0
2.5
5.0
7.5
0
MAX3243
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3221/3223-04
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
2000 30001000 4000 5000
V
OUT
+
1 TRANSMITTER AT 235kbps
2 TRANSMITTERS AT 30kbps
V
OUT
-
ALL OUTPUTS LOADED WITH 3kΩ +C
L
0.1µF CHARGE-PUMP CAPACITORS
FOR ALL DATA RATES UP TO 235kbps
4
6
8
10
12
14
16
18
20
22
24
0
MAX3243
SLEW RATE
vs. LOAD CAPACITANCE
MAX3221/3223-05
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
2000 30001000 4000 5000
+SLEW
-SLEW
0
5
10
15
20
25
30
35
45
40
0
MAX3243
SUPPLY CURRENT vs. LOAD
CAPACITANCE WHEN TRANSMITTING DATA
MAX3221/3223-06
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
2000 30001000 4000 5000
235kbps
120kbps
20kbps