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

Up to 1Mbps, True RS-232 Transceivers

TIMING CHARACTERISTICS—MAX3237E

(VCC = +3V to +5.5V, C1–C4 = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +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 TA = +25°C.

Transmitter skew is measured at the transmitter zero crosspoints.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

RL = 3kΩ, CL = 1000pF, one transmitter switching,

MBAUD = GND

250

VCC = +3.0V to +4.5V, RL = 3kΩ, CL = 250pF,

one transmitter switching, MBAUD = VCC

1000

Maximum Data Rate

VCC = +4.5V to +5.5V, RL = 3kΩ, CL = 1000pF,

one transmitter switching, MBAUD = VCC

1000

kbps

tPHL

0.15

Receiver Propagation Delay

R_IN to R_OUT, CL = 150pF

tPLH

0.15

µs

Receiver Output Enable Time

Normal operation

2.6

µs

Receiver Output Disable Time

Normal operation

2.4

µs

|tPHL - tPLH|, MBAUD = GND

Transmitter Skew (Note 7)

|tPHL - tPLH|, MBAUD = VCC

100

ns

Receiver Skew

|tPHL - tPLH|50

ns

MBAUD = GND

6

30

CL = 150pF

to 1000pF

MBAUD = VCC

24

150

VCC = +3.3V,

RL = 3kΩ to 7kΩ,

+3.0V to -3.0V or

-3.0V to +3.0V,

TA = +25°C

CL = 150pF to 2500pF,

MBAUD = GND

430

V/µs

Transition-Region Slew Rate

TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246E

(VCC = +3V to +5.5V, C1–C4 = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 3, 4)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

TA = TMIN to TMAX

(MAX3222E/MAX3232E/

MAX3241E) (Note 6)

250

Maximum Data Rate

RL = 3kΩ,

CL = 1000pF,

one transmitter

switching

TA = +25°C (MAX3246E)

250

kbps

tPHL

0.15

Receiver Propagation Delay

tPLH

Receiver input to receiver output,

CL = 150pF

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

|tPHL - tPLH|

(Note 7)

100

ns

Receiver Skew

|tPHL - tPLH|50

ns

Transition-Region Slew Rate

VCC = +3.3V, TA = +25°C,

RL = 3kΩ to 7kΩ, measured

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

+3.0V, one transmitter switching

CL = 150pF

to 1000pF

6

30

V/µs

4

Maxim Integrated

MAX3222E/MAX3232E/MAX3237E/

MAX3241E/MAX3246E