3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
_____________________________Typical Operating Characteristics (continued)
(V
CC
= +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ, T
A
= +25°C, unless otherwise noted.)
MAX3241
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3222-04
MAX3222/MAX3232/MAX3237/MAX3241
MAX3241
SLEW RATE
vs. LOAD CAPACITANCE
MAX3222-05
MAX3241
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
MAX3222-06
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
45
1 TRANSMITTER AT 235kbps
2 TRANSMITTERS AT 30kbps
-SLEW
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3237
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = GND)
MAX3222-07
MAX3237
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = V
CC
)
TRANSMITTER OUTPUT VOLTAGE (V)
1Mbps
5.0
2.5
0
-2.5
-5.0
-7.5
2Mbps
1.5Mbps
2
1Mbps
0
0
500
1000
1500
2000
0
LOAD CAPACITANCE (pF)
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C
L
LOAD, EACH OUTPUT
V
CC
= 3.3V
2Mbps
1.5Mbps
MAX3222-08
MAX3237
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = GND)
MAX3222-09
7.5
TRANSMITTER OUTPUT VOLTAGE (V)
5.0
2.5
0
-2.5
-5.0
-7.5
0
1000
2000
3000
4000
7.5
12
10
SLEW RATE (V/µs)
+SLEW
8
6
4
1 TRANSMITTER AT 240kbps
4 TRANSMITTERS AT 15kbps
3kΩ + C
L
LOADS
V
CC
= 3.3V
1000
2000
3000
4000
-SLEW
1 TRANSMITTER AT 240kbps
4 TRANSMITTERS AT 15kbps
3kΩ + C
L
LOADS
V
CC
= 3.3V
5000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3237
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = V
CC
)
MAX3222-10
MAX3237
SUPPLY CURRENT vs.
LOAD CAPACITANCE (MBAUD = GND)
MAX3222-11
MAX3237
SKEW vs. LOAD CAPACITANCE
(t
PLH
- t
PHL
)
60
50
40
1 TRANSMITTER AT 512kbps
4 TRANSMITTERS AT 32kbps
3kΩ + C
L
LOADS
V
CC
= 3.3V
MBAUD = V
CC
MAX
AVERAGE; 10 PARTS
SKEW (ns)
MAX3222-12
70
60
SLEW RATE (V/µs)
50
40
30
20
10
0
0
-SLEW, 1Mbps
+SLEW, 1Mbps
-SLEW, 2Mbps
+SLEW, 2Mbps
60
50
SUPPLY CURRENT (mA)
40
30
20kbps
20
10
0
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C
L
LOADS
V
CC
= 3.3V
0
1000
2000
3000
4000
240kbps
120kbps
70
30
20
10
0
0
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C
L
LOAD EACH OUTPUT
V
CC
= 3.3V
500
1000
1500
2000
MIN
5000
500
1000
1500
2000
2500
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
_______________________________________________________________________________________
5
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
