Rainbow Electronics MAX13237E - Manual (Page 11)

MAX13234E–MAX13237E
3Mbps RS-232 Transceivers with
Low-Voltage Interface
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Table 1. Transceiver Mode Control
FORCEOFF
FORCEON
R_IN or T_IN
EDGE WITHIN 30s
T_OUT R_OUT TRANSCEIVER STATUS
0 X X High-Impedance Active Shutdown (Forced Off)
1 1 X Active Active Normal Operation (Forced On)
1 0 Yes Active Active Normal Operation in AutoShutdown Plus
1 0 No High-Impedance Active Shutdown in AutoShutdown Plus
X = Don’t Care.
R_IN
T_IN
R
S
30s
TIMER
EDGE
DETECT
EDGE
DETECT
FORCEOFF
FORCEON
POWERDOWN*
AUTOSHDN
FORCEOFF
FORCEON
* POWERDOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 6. AutoShutdown Plus and Shutdown Logic