MAX3238CAIT Maxim Integrated Products, Inc., MAX3238CAIT Datasheet - Page 8

• Manufacturer Part Number: MAX3238CAIT
• Description: Max3238 +3.0v To +5.5v, 1?a, Up To 250kbps, True Rs-232 Transceiver With Autoshutdown Plus
• Manufacturer: Maxim Integrated Products, Inc.

+3.0V to +5.5V, 1µA, up to 250kbps, True
RS-232 Transceiver with AutoShutdown Plus
Figure 4a. Receiver Positive/Negative Thresholds for INVALID
Figure 4b. AutoShutdown Plus and INVALID Timing Diagram
8
_______________________________________________________________________________________
** ANY ONE RECEIVER/TRANSMITTER BECOMES ACTIVE
INVALID
OUTPUT
* ALL RECEIVERS/TRANSMITTERS INACTIVE
TRANSMITTER
TRANSMITTER
+2.7V
+0.3V
-0.3V
-2.7V
0V
RECEIVER
OUTPUTS
VOLTAGE
VOLTAGE
VOLTAGE
INPUTS
INPUTS
V
V
CC
V+
CC
V-
0
0
I
NVL
*
INDETERMINATE
INDETERMINATE
INVALID HIGH
INVALID HIGH
INVALID LOW
**
INVALID
REGION
t
AUTOSHDN
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor’s equiv-
alent series resistance (ESR), which usually rises at low
temperatures, influences the amount of ripple on V+
and V-.
Table 3. Required Minimum Capacitance
Values
t
WU
3.15 to 3.6
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
V
(V)
CC
t
AUTOSHDN
0.047
FORCEON = GND, FORCEOFF = V
(µF)
0.22
0.22
C1
0.1
t
WU
C2, C3, C4, C
0.22
0.33
(µF)
CC
0.1
1
BYPASS