Datasheet

MAX3218
1µA Supply Current, 1.8V to 4.25V-Powered
RS-232 Transceiver with AutoShutdown™
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
CC
= 1.8V to 4.25V, C1 = 0.47µF, C2 = C3 = C4 = 1µF, L1 = 15µH, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at V
CC
= 3.0V, T
A
= +25°C.)
ns500t
DT
Transmitter Output Disable Time
2500pF || 3kΩ load each transmitter, one trans-
mitter switching, 150pF load each receiver
T
A
= +25°C, V
CC
= 3.0V, R
L
= 3kΩ to 7kΩ,
C
L
= 50pF to 2500pF, measured from
+3V to -3V or -3V to +3V
2500pF || 3kΩ load
150pF load
150pF load
2500pF || 3kΩ load
CONDITIONS
ns200 500t
DR
Receiver Output Disable Time
ns90 300t
ER
kbps120 235Data Rate
Receiver Output Enable Time
V/µs3.0 30Transition Region Slew Rate
1.8 2.7t
PLHT
Transmitter Propagation Delay
µs250 450t
ET
Transmitter Output Enable Time
ns
290 1000t
PHLR
260 1000t
PLHR
Receiver Propagation Delay
µs
1.9 2.7t
PHLT
UNITSMIN TYP MAXSYMBOLPARAMETER
TIMING CHARACTERISTICS
(Circuit of Figure 1, V
CC
= 1.8V to 4.25V, C1 = 0.47µF, C2 = C3 = C4 = 1µF, L1 = 15µH, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at V
CC
= 3.0V, T
A
= +25°C.)
V
CC
= 2.0V to 4.25V
CONDITIONS
0.4
UNITSMIN TYP MAXPARAMETER
V
CC
= 1.8V to 4.25V
V
CC
= 1.8V to 4.25V
V
0.3
Input Threshold Low
3.0
-15V < R_IN < 15V kΩ357
V
CC
= 1.8V to 3.6V
Input Resistance
Input Hysteresis V
V
2.8
Input Threshold High
0.7
V
CC
= 0V, -2V < T_OUT < 2V
Output Short-Circuit Current mA
Ω300Output Resistance
±24 ±100
All transmitter outputs loaded with 3kΩ to groundOutput Voltage Swing V±5 ±6
V-25 +25Input Voltage Range
EIA/TIA-232E RECEIVER INPUTS
EIA/TIA-232E TRANSMITTER OUTPUTS
Figure 4b µs250t
WU
Receiver Threshold to
Transmitters Enabled
Figure 4b µs1t
INVH
Receiver Positive or Negative
Threshold to INVALID High
Figure 4b µs30t
INVL
Receiver Positive or Negative
Threshold to INVALID Low
AUTOSHUTDOWN TIMING