MAX13234E Datasheet, PDF (11/16 Pages) Maxim Integrated Products – 3Mbps RS-232 Transceivers with Low-Voltage Interface

3Mbps RS-232 Transceivers with
Low-Voltage Interface
T_IN
EDGE
DETECT
R_IN
EDGE
DETECT
FORCEON
FORCEOFF
S
30s
TIMER
R
FORCEOFF
FORCEON
AUTOSHDN
* POWERDOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
POWERDOWN*
Figure 6. AutoShutdown Plus and Shutdown Logic
Table 1. Transceiver Mode Control
FORCEOFF
FORCEON
R_IN or T_IN
EDGE WITHIN 30s
T_OUT
0
X
1
1
1
0
1
0
X
High-Impedance
X
Active
Yes
Active
No
High-Impedance
X = Don’t Care.
R_OUT
Active
Active
Active
Active
TRANSCEIVER STATUS
Shutdown (Forced Off)
Normal Operation (Forced On)
Normal Operation in AutoShutdown Plus
Shutdown in AutoShutdown Plus
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