SP3221E Datasheet, PDF (12/18 Pages) Sipex Corporation – Intelligent +3.0V to +5.5V RS-232 Transceiver

RS-232 Cable
Connected?
YES
SHUTDOWN
INPUT
HIGH
ONLINE
INPUT
-
NO
HIGH
HIGH
NO
HIGH
LOW
YES
LOW
-
STATUS
OUTPUT
HIGH
LOW
LOW
HIGH
TRANSCEIVER
STATUS
TxOUT
Normal
Operation
Active
Normal
Operation
Active
Shutdown
(Auto-Online)
HiZ
Shutdown
HiZ
NO
LOW
-
LOW
Shutdown
HiZ
Table 3. Auto-Online Logic
NOTE: For proper ONLINE function the SP3221E and cable must be
connected to another RS232 Transceiver (3kΩ to 7kΩ load).
SP3221E
ONLINE
STATUS
Cable unplugged
Device enters low-power mode
automatically
STATUS forced low
SP321E
RS232 Device
Cable is connected to
RS-232 Reciever
ONLINE
STATUS
SP3221E comes ONLINE
automatically
STATUS Drives High
Figure 15. SP3221E AutoOnline Operation
Date: 7/21/04
SP3221E +3.0V to +5.5V RS-232 Transceiver
12
© Copyright 2004 Sipex Corporation