MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
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
MAX3222/MAX3232
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3222-01
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
MAX3222/MAX3232
SLEW RATE
vs. LOAD CAPACITANCE
MAX3222-02
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
2000 30001000 4000 5000
FOR DATA RATES UP TO 235kbps
+SLEW
-SLEW
0
5
10
15
20
25
30
35
40
0
MAX3222/MAX3232
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA
MAX3222-03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
2000 30001000 4000 5000
235kbps
120kbps
20kbps
R
L
= 3kΩ, C
L
= 1000pF, one transmitter switching,
MBAUD = GND
Normal operation
CONDITIONS
Normal operation ns200Receiver Output Disable Time
| t
PHL
- t
PLH
|, MBAUD = GND
ns100
0.15
250
µs
0.15
Receiver Propagation Delay
ns200Receiver Output Enable Time
UNITS
MIN TYP MAX
PARAMETER
TIMING CHARACTERISTICS—MAX3237
(V
CC
= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
V
CC
= 3.0V to 4.5V, R
L
= 3kΩ, C
L
= 250pF,
one transmitter switching, MBAUD = V
CC
1000
V
CC
= 4.5V to 5.5V, R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching, MBAUD = V
CC
kbps
1000
Maximum Data Rate
R_IN to R_OUT, C
L
= 150pF
| t
PHL
- t
PLH
|, MBAUD = V
CC
ns25
Transmitter Skew
| t
PHL
- t
PLH
|
ns50Receiver Skew
630
V/µs
430
t
PHL
t
PLH
C
L
= 150pF to 2500pF,
MBAUD = GND
C
L
= 150pF
to 1000pF
MBAUD =
GND
V
CC
= 3.3V, R
L
= 3Ω to 7kΩ,
+3V to -3V or -3V to +3V,
T
A
= +25°C
Transition-Region Slew Rate
MBAUD =
V
CC
24 150
Note 2: MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.
MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested
at 5.0V ±10%.
Note 3: Transmitter input hysteresis is typically 250mV.
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