Half-Duplex RS-485-/RS-422-Compatible
Transceiver with AutoDirection Control
Test Circuits and Waveforms (continued)
V
CC
0
RE
1.5V
1.5V
t
, t
t
RZL(SHDN) RZL
RHZ
V
CC
0
V
V
+ 0.5V
+ 0.5V
OH
RO
RO
2.3V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
V
CC
2.3V
OH
0
t
, t
t
RHZ
RZH(SHDN) RZH
DI = 0V
Figure 7. Receiver Enable and Disable Times
V
CC
0
1.5V
SHDN
t
RZL(SHDN)
V
V
CC
0
V
500Ω
CC
RO
RO
2.3V
S
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
1
2
RO
C
S
L
CC
0
2.3V
t
RZH(SHDN)
DI = 1
Figure 8. Receiver Enable Time from Shutdown
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