SP3221E 데이터 시트보기 (PDF) - Exar Corporation
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SP3221E Datasheet PDF : 22 Pages
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RS-232 SIGNAL
AT RECEIVER
INPUT
SHUTDOWN
YES
HIGH
YES
HIGH
NO
HIGH
NO
HIGH
YES
LOW
NO
LOW
Table 3. AUTO ON-LINE® Logic
RECEIVER +2.7V
RS-232 INPUT 0V
VOLTAGES -2.7V
STATUS
VCC
0V
+5V
DRIVER
RS-232 OUTPUT 0V
VOLTAGES
-5V
ONLINE
LOW
HIGH
HIGH
LOW
HIGH/LOW
HIGH/LOW
tSTSL
STATUS
HIGH
HIGH
LOW
LOW
HIGH
LOW
S
H
U
T
D
O
W
N
tSTSH
tONLINE
Figure 13. AUTO ON-LINE® Timing Waveforms
TRANSCEIVER STATUS
Normal Operation
(AUTO ON-LINE©)
Normal Operation
Normal Operation
Shutdown (AUTO ON-LINE©)
Shutdown
Shutdown
Inactive Detection Block
RXINACT
RXIN
RS-232
Receiver Block
Figure 14. Stage I of AUTO ON-LINE® Circuitry
RXOUT
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • www.exar.com
14
SP3221E_200_081816
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