Datasheet

MAX3238
+3.0V to +5.5V, 1µA, up to 250kbps, True
RS-232 Transceiver with AutoShutdown Plus
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +5.5V; C1–C4 = 0.1µF (tested at 3.3V ±5%), C1–C4 = 0.22µF (tested at 3.3V ±10%), C1 = 0.047µF and
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.)
Figure 4a
Figure 7a
Figure 4b (Note 2)
V
CC
= 5V, Figure 4b (Note 2)
V
CC
= 5V, Figure 4b
I
OUT
= 1.6mA
I
OUT
= -1.0mA
V
CC
= 5V, Figure 4b
CONDITIONS
V-0.3 0.3
Receiver Input Threshold to
INVALID Output Low
V
2.7
Receiver Input Threshold to
INVALID Output High
sec15 30 60
Receiver or Transmitter Edge to
Shutdown (t
AUTOSHDN
)
µs25
Receiver or Transmitter Edge to
Transmitters Enabled (t
WU
)
µs50
Receiver Positive or Negative
Threshold to INVALID Low (t
INVL
)
V0.4
INVALID Output Voltage Low
V
V
CC -
0.6
INVALID Output Voltage High
µs0.1
Receiver Positive or Negative
Threshold to INVALID High (t
INVH
)
UNITSMIN TYP MAXPARAMETER
Positive threshold
Negative threshold -2.7
Output Voltage Swing All transmitter outputs loaded with 3kΩ to ground ±5.0 ±5.4 V
Output Resistance V
CC
= V+ = V- = GND, T
OUT
= 2V 300 10M Ω
V
CC
≤ 3.6V ±35 ±60
Output Leakage Current
V
OUT
= ±12V, V
CC
= 0V to 5.5V,
transmitters disabled
±25 µA
| t
PHL
- t
PLH
|
430
t
PHL
R_IN to R_OUT,
C
L
= 150pF
t
PLH
C
L
= 150pF to 1000pF
R
L
= 3kΩ, C
L
= 1000pF, one transmitter switching
C
L
= 150pF to 2500pF
0.15
V
CC
= 3.3V,
T
A
= +25°C,
R
L
= 3Ω to 7kΩ,
measured from +3V to
-3V or -3V to +3V
Normal operation
Normal operation
| t
PHL
- t
PLH
|
µs
0.15
Receiver Propagation Delay
kbps250Maximum Data Rate
V/µs
630
Transition-Region Slew Rate
ns200Receiver Output Enable Time
ns200Receiver Output Disable Time
ns100Transmitter Skew
ns50Receiver Skew
TIMING CHARACTERISTICS
Output Short-Circuit Current
V
CC
> 3.6V ±40 ±100
AutoShutdown (FORCEON = GND, FORCEOFF = V
CC
)
TRANSMITTER OUTPUTS
Note 2: A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds.
mA