±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E
TIMING CHARACTERISTICS—MAX3237E
(V
CC
= +3.0V to +5.5V, C1–C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
CONDITIONS
R
L
= 3kΩ, C
L
= 1000pF, one transmitter switching,
MBAUD = GND
Maximum Data Rate
V
CC
= 3.0V to 4.5V, R
L
= 3kΩ, C
L
= 250pF,
one transmitter switching, MBAUD = V
CC
V
CC
= 4.5V to 5.5V, R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching, MBAUD = V
CC
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Receiver Skew
R_IN to R_OUT, C
L
= 150pF
Normal operation
Normal operation
| t
PHL
- t
PLH
|, MBAUD = GND
| t
PHL
- t
PLH
|, MBAUD = V
CC
| t
PHL
- t
PLH
|
V
CC
= 3.3V, R
L
= 3kΩ to
7kΩ,
+3V to -3V or -3V to +3V,
T
A
= +25°C
C
L
= 150pF
to 1000pF
MBAUD =
GND
MBAUD =
V
CC
6
24
4
t
PHL
t
PLH
MIN
250
1000
1000
0.15
0.15
2.6
2.4
100
50
30
150
30
V/µs
µs
µs
ns
ns
kbps
TYP
MAX
UNITS
Transition-Region Slew Rate
C
L
= 150pF to 2500pF,
MBAUD = GND
Note 2:
MAX3222E/MAX3232E/MAX3241E: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2, C3, C4 = 0.33µF tested at 5.0V
±10%. MAX3237E: C1–C4 = 0.1µF tested at 3.3V ±5%, C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2, C3, C4 =
0.33µF tested at 5.0V ±10%.
Note 3:
The MAX3237E logic inputs have an active positive feedback resistor. The input current goes to zero when the inputs are at
the supply rails.
Note 4:
Transmitter skew is measured at the transmitter zero crosspoints.
__________________________________________Typical Operating Characteristics
(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.)
MAX3222E/MAX3232E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
TRANSMITTER OUTPUT VOLTAGE (V)
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
0
1000
2000
3000
MAX3237E toc01
MAX3222E/MAX3232E
SLEW RATE vs. LOAD CAPACITANCE
MAX3237E toc02
MAX3222E/MAX3232E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
40
SUPPLY CURRENT (mA)
35
250kbps
30
25
20
15
10
20kbps
120kbps
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
MAX3237E toc03
16
14
12
SLEW RATE (V/µs)
10
8
6
4
+SLEW
-SLEW
45
V
OUT+
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
V
OUT-
2
FOR DATA RATES UP TO 250kbps
0
5000
0
1000
2000
3000
4000
5000
5
0
0
1000
2000
3000
4000
5000
4000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
4
_______________________________________________________________________________________
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