±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

4

_______________________________________________________________________________________

TIMING CHARACTERISTICS—MAX3237E

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 7: Transmitter skew is measured at the transmitter zero crosspoints.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

MBAUD = GND

250

1000

Maximum Data Rate

1000

kbps

0.15

Receiver Propagation Delay

0.15

µs

Receiver Output Enable Time

Normal operation

2.6

µs

Receiver Output Disable Time

Normal operation

2.4

µs

Transmitter Skew (Note 7)

100

ns

Receiver Skew

50

ns

MBAUD = GND

6

30

to 1000pF

24

150

Ω to 7kΩ,

+3.0V to -3.0V or

-3.0V to +3.0V,

MBAUD = GND

430

V/µs

Transition-Region Slew Rate

TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246E

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

(MAX3222E/MAX3232E/

MAX3241E) (Note 6)

250

Maximum Data Rate

Ω,

one transmitter

switching

250

kbps

0.15

Receiver Propagation Delay

Receiver input to receiver output,

0.15

µs

Receiver Output Enable Time

Normal operation (except MAX3232E)

200

ns

Receiver Output Disable Time

Normal operation (except MAX3232E)

200

ns

Transmitter Skew

(Note 7)

100

ns

Receiver Skew

ns

Transition-Region Slew Rate

Ω to 7kΩ, measured

from +3.0V to -3.0V or -3.0V to

+3.0V, one transmitter switching

to 1000pF

630

V/µs