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