1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
MAX3224–MAX3227/MAX3244/MAX3245
†
TIMING CHARACTERISTICS—MAX3224/MAX3226/MAX3244
(V
CC
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C
L
= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Receiver Skew
⏐
t
PHL
- t
PLH
⏐
⏐
t
PHL
- t
PLH
⏐
t
PHL
t
PLH
SYMBOL
CONDITIONS
R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching
R_IN to R_OUT, C
L
= 150pF
Normal operation (MAX3244 only)
Normal operation (MAX3244 only)
(Note 3)
C
L
= 150pF
to 1000pF
C
L
= 150pF
to 2500pF
MIN
250
0.15
0.15
200
200
100
50
V
CC
= 3.3V, T
A
= +25°C,
R
L
= 3kΩ to 7kΩ,
measured from +3V to -3V
or -3V to +3V
6
4
30
V/µs
30
TYP
MAX
UNITS
kbps
µs
ns
ns
ns
ns
Transition-Region Slew Rate
TIMING CHARACTERISTICS—MAX3225/MAX3227/MAX3245
(V
CC
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C
L
= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching
Maximum Data Rate
V
CC
= 3.0V to 4.5V, R
L
= 3kΩ,
C
L
= 250pF, one transmitter switching
V
CC
= 4.5V to 5.5V, R
L
= 3kΩ,
C
L
= 1000pF, one transmitter switching
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Receiver Skew
Transition-Region Slew Rate
⏐
t
PHL
- t
PLH
⏐
⏐
t
PHL
- t
PLH
⏐
t
PHL
t
PLH
R_IN to R_OUT, C
L
= 150pF
Normal operation (MAX3245 only)
Normal operation (MAX3245 only)
(Note 3)
V
CC
= 3.3V, T
A
= +25°C,
R
L
= 3kΩ to 7kΩ, C
L
= 150pF to 1000pF,
measured from +3V to -3V or -3V to +3V
MIN
250
1000
1000
0.15
0.15
200
200
25
50
24
150
µs
ns
ns
ns
ns
V/µs
kbps
TYP
MAX
UNITS
Note 2:
A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds.
Note 3:
Transmitter skew is measured at the transmitter zero cross points.
4
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
