±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C
L
, T
A
= +25°C, unless otherwise noted.)
MAX3237E
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = GND)
MAX3237E toc09
MAX3237E
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = V
CC
)
MAX3237E toc10
MAX3237E
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA (MBAUD = GND)
250kbps
40
SUPPLY CURRENT (mA)
120kbps
20kbps
30
MAX3237E toc11
12
10
SR-
SLEW RATE (V/µs)
8
SR+
6
4
2
0
0
500
1000
1500
2000
2500
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ + C
L
70
60
SLEW RATE (V/µs)
50
40
30
20
10
0
0
-SLEW, 1Mbps
+SLEW, 1Mbps
-SLEW, 2Mbps
+SLEW, 2Mbps
50
20
1 TRANSMITTER AT 20kbps, 120kbps, 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ + C
L
0
500
1000
1500
2000
2500
3000
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C
L
LOAD EACH OUTPUT
500
1000
1500
2000
10
3000
0
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3237E
TRANSMITTER SKEW vs. LOAD CAPACITANCE
(MBAUD = V
CC
)
MAX3237E toc12
MAX3237E
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (MBAUD = GND)
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
2.0
TRANSMITTER OUTPUT VOLTAGE (V)
V
OUT
+
MAX3237E toc13
MAX3237E SUPPLY CURRENT
vs. SUPPLY VOLTAGE (MBAUD = GND)
MAX3237E toc14
100
50
TRANSMITTER SKEW (ns)
SUPPLY CURRENT (mA)
80
40
60
40
|t
PLH
-
t
PHL
|
1 TRANSMITTER AT 500kbps
4 TRANSMITTERS AT 1/16 DATA RATE
ALL TRANSMITTERS LOADED
WITH 3kΩ + C
L
0
500
1000
1500
2000
LOAD CAPACITANCE (pF)
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ +1000pF
30
20
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ AND 1000pF
2.0
2.5
3.0
3.5
4.0
4.5
5.0
20
10
V
OUT-
0
2.5
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE (V)
0
SUPPLY VOLTAGE (V)
MAX3246E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
0
MAX3237E toc15
MAX3246E
SLEW RATE vs. LOAD CAPACITANCE
MAX3237E toc16
MAX3246E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
55
50
45
40
35
30
25
20
15
10
5
0
20kbps
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
MAX3237E toc17
16
14
SLEW RATE (V/µs)
12
10
SR+
8
6
SR-
60
TRANSMITTER OUTPUT VOLTAGE (V)
V
OUT+
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
SUPPLY CURRENT (mA)
250kbps
120kbps
V
OUT-
4
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
6
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
