Datasheet

(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.)
Note 2: C1–C4 = 0.1μF, tested at 3.3V ±10%. C1 = 0.047μF, C2–C4 = 0.33μF, tested at 5.0V ±10%.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Receiver Positive or Negative
Threshold to INVALID High (t
INVH
)
Figure 5 1 µs
Receiver Positive or Negative
Threshold to INVALID Low (t
INVL
)
Figure 5 30 µs
RECEIVER INPUTS
Input Voltage Range -25 +25 V
Input Threshold Low T
A
= +25°C
V
CC
= 3.3V 0.6 1.2
V
V
CC
= 5.0V 0.8 1.5
Input Threshold High T
A
= +25°C
V
CC
= 3.3V 1.5 2.4
V
V
CC
= 5.0V 1.8 2.4
Input Hysteresis 0.3 V
Input Resistance T
A
= +25°C 3 5 7 kΩ
TRANSMITTER OUTPUTS
Output Voltage Swing All transmitter outputs loaded with 3kΩ to ground ±5.0 ±5.4 V
Output Resistance V
CC
= V+ = V- = 0V, transmitter output = ±2V 300 10M Ω
Output Short-Circuit Current ±35 ±60 mA
Output Leakage Current
V
OUT
= ±12V, V
CC
= 0V or 3.0V to 5.5V,
transmitters disabled
±25 μA
MOUSE DRIVEABILITY (MAX3243)
Transmitter Output Voltage
T1IN = T2IN = GND, T3IN = V
CC
,
T3OUT loaded with 3kΩ to GND, T1OUT and
T2OUT loaded with 2.5mA each
±5 V
TIMING CHARACTERISTICS
Maximum Data Rate R
L
= 3kΩ, C
L
= 1000pF, one transmitter switching 120 235 kbps
Receiver Propagation Delay
Receiver input to receiver output,
C
L
= 150pF
t
PHL
0.3
μs
t
PLH
0.3
Receiver Output Enable Time Normal operation 200 ns
Receiver Output Disable Time Normal operation 200 ns
Transmitter Skew │t
PHL
– t
PLH
│
MAX3221/MAX3223 200
ns
MAX3243 200 1000
Receiver Skew │t
PHL
– t
PLH
│
MAX3221/MAX3223 100
ns
MAX3243 100 500
Transition-Region Slew Rate
V
CC
= 3.3V, R
L
= 3kΩ to 7kΩ,
T
A
= +25°C, measured from
+3V to -3V or -3V to +3V
C
L
= 200pF to
2500pF
4 8.0 30
V/μs
C
L
= 200pF to
1000pF
6 30
Electrical Characteristics (continued)
MAX3221/MAX3223/
MAX3243
+3V to +5.5V RS-232
Transceivers with AutoShutdown
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