Datasheet

(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)
(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)
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: MAX3241EEUI is specified at T
A
= +25°C.
Transmitter skew is measured at the transmitter zero crosspoints.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Maximum Data Rate
R
L
= 3kΩ,
C
L
= 1000pF,
one transmitter
switching
T
A
= T
MIN
to T
MAX
(MAX3222E/MAX3232E/
MAX3241E) (Note 6)
250
kbps
T
A
= +25°C (MAX3246E) 250
Receiver Propagation Delay
t
PHL
Receiver input to receiver output,
C
L
= 150pF
0.15
µs
t
PLH
0.15
Receiver Output Enable Time Normal operation (except MAX3232E) 200 ns
Receiver Output Disable Time Normal operation (except MAX3232E) 200 ns
Transmitter Skew |t
PHL
- t
PLH
| (Note 7) 100 ns
Receiver Skew |t
PHL
- t
PLH
| 50 ns
Transition-Region Slew Rate
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
6 30 V/µs
PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Data Rate
R
L
= 3kΩ, C
L
= 1000pF, one transmitter switching,
MBAUD = GND
250
kbps
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
1000
Receiver Propagation Delay R_IN to R_OUT, C
L
= 150pF
t
PHL
0.15
µs
t
PLH
0.15
Receiver Output Enable Time Normal operation 2.6 µs
Receiver Output Disable Time Normal operation 2.4 µs
Transmitter Skew (Note 7)
|t
PHL
- t
PLH
|, MBAUD = GND
100 ns
|t
PHL
- t
PLH
|, MBAUD = V
CC
Receiver Skew |t
PHL
- t
PLH
| 50 ns
Transition-Region Slew Rate
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 6 30
V/µs
MBAUD = V
CC
24 150
C
L
= 150pF to 2500pF,
MBAUD = GND
4 30
www.maximintegrated.com
Maxim Integrated │ 4
MAX3222E/MAX3232E/
MAX3237E/MAX3241E/
MAX3246E
±15kV ESD-Protected, Down to 10nA,
3.0V to 5.5V, Up to 1Mbps,
True RS-232 Transceivers
Timing Characteristics—MAX3222E/MAX3232E/MAX3241E/MAX3246E
Timing Characteristics—MAX3237E