MAX3380E Datasheet, PDF (8/14 Pages) Maxim Integrated Products – +2.35V to +5.5V, 1μA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins

+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
Table 1. AutoShutdown Plus Truth Table
OPERATION
STATUS
FORCEON
FORCEOFF
VALID
RECEIVER
LEVEL
Shutdown
(Forced Off)
X
0
X
RECEIVER OR
TRANSMITTER EDGE
WITHIN 30s
X
Normal Operation
(Forced On)
1
1
X
X
Normal Operation
(AutoShutdown
0
1
X
Yes
Plus)
Shutdown
(AutoShutdown
0
1
X
No
Plus)
Normal Operation INVALID
1
Yes
X
Normal Operation INVALID
1
X
Yes
Shutdown
INVALID
1
No
No
Normal Operation
(AutoShutdown)
INVALID
INVALID
Yes
X
Shutdown
(AutoShutdown)
INVALID
INVALID
No
X
X = Don’t care
T_OUT
High-Z
Active
Active
High-Z
Active
Active
High-Z
Active
High-Z
R_OUT
Active
Active
Active
Active
Active
Active
Active
Active
Active
+0.3V
R_IN
30µs
TIMER
INVALID
-0.3V
R
INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR
AT LEAST 30µs.
Figure 2a. INVALID Functional Diagram, INVALID Low
+2.7V
R_IN
0.3µs
TIMER
INVALID
-2.7V
R
INVALID DEASSERTED IF ANY RECEIVER INPUT HAS BEEN BETWEEN +2.7V AND -2.7V
FOR LESS THAN 30µs.
Figure 2b. INVALID Functional Diagram, INVALID High
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