±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246E
(V
CC
= +3V 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.) (Notes 3, 4)
PARAMETER
SYMBOL
CONDITIONS
R
L
= 3kΩ,
C
L
= 1000pF,
one transmitter
switching
t
PHL
t
PLH
T
A
= T
MIN
to T
MAX
(MAX3222E/MAX3232E/
MAX3241E)
T
A
= +25°C (MAX3246E)
MIN
250
250
0.15
0.15
200
200
100
50
V
CC
= +3.3V, T
A
= +25°C,
R
L
= 3kΩ to 7kΩ, measured
from +3.0V to –3.0V or –3.0V to
+3.0V, one transmitter switching
C
L
= 150pF
to 1000pF
µs
ns
ns
ns
ns
TYP
MAX
UNITS
Maximum Data Rate
kbps
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Receiver Skew
Receiver input to receiver output,
C
L
= 150pF
Normal operation (except MAX3232E)
Normal operation (except MAX3232E)
|t
PHL
- t
PLH
|
|t
PHL
- t
PLH
|
(Note 6)
Transition-Region Slew Rate
6
30
V/µs
TIMING CHARACTERISTICS—MAX3237E
(V
CC
= +3V 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 3)
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 (Note 6)
| t
PHL
- t
PLH
|, MBAUD = V
CC
(Note 6)
| t
PHL
- t
PLH
|
V
CC
= +3.3V,
R
L
= 3kΩ to 7kΩ,
+3.0V to –3.0V or
-3.0V to +3.0V,
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 3:
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%. MAX3246E; C1-C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.22µF, C2, C3, C4 = 0.54µF tested at
5.0V ±10%.
Note 4:
MAX3246E devices are production tested at +25°C. All limits are guaranteed by design over the operating temperature range.
Note 5:
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 6:
Transmitter skew is measured at the transmitter zero crosspoints.
4
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