3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
MAX3222/MAX3232/MAX3237/MAX3241
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.)
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
R_IN to R_OUT, C
L
= 150pF
Normal operation
t
PHL
t
PLH
MIN
250
1000
1000
0.15
0.15
200
200
100
25
50
C
L
= 150pF
to 1000pF
MBAUD =
GND
MBAUD =
V
CC
6
24
4
30
150
30
V/µs
µs
ns
ns
ns
ns
ns
kbps
TYP
MAX
UNITS
Receiver Output Disable Time Normal operation
Transmitter Skew
Receiver Skew
|
t
PHL
- t
PLH
|
, MBAUD = GND
|
t
PHL
- t
PLH
|
, MBAUD = V
CC
|
t
PHL
- t
PLH
|
Transition-Region Slew Rate
V
CC
= 3.3V, R
L
= 3Ω to 7kΩ,
+3V to -3V or -3V to +3V,
T
A
= +25°C
C
L
= 150pF to 2500pF,
MBAUD = GND
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.
__________________________________________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.)
MAX3222/MAX3232
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3222-01
MAX3222/MAX3232
SLEW RATE
vs. LOAD CAPACITANCE
20
18
SLEW RATE (V/µs)
16
14
12
10
8
6
4
2
0
5000
150
1000
2000
3000
4000
5000
5
0
+SLEW
-SLEW
FOR DATA RATES UP TO 235kbps
MAX3222-02
MAX3222/MAX3232
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA
35
235kbps
SUPPLY CURRENT (mA)
30
25
120kbps
20
15
20kbps
10
MAX3222-03
TRANSMITTER OUTPUT VOLTAGE (V)
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
0
1000
2000
3000
22
40
V
OUT
+
V
OUT
-
4000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
4
_______________________________________________________________________________________
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