Rainbow Electronics MAX3430 - Manual (Page 7)

MAX3430
±80V Fault-Protected, Fail-Safe,
1/4-Unit Load, +3.3V RS-485 Transceiver
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C L
20pF
R
0
A
B
V OH
V OL
1.5V
t RPLH t RPHL
RO
V ID
Figure 6. Receiver Propagation Delays
50 Ω
GENERATOR
C L
20pF
V CC
3V
0
V CC
V OL
R
+1.5V
-1.5V V ID
(V OL + V CC )/2
RO
S1
S2
R
1k Ω
RE 1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
t RZL , t RZL (SHDN)
3V
0
V OH
0
V OH /2
RE
S1 OPEN
S2 CLOSED
S3 = +1.5V
t RZH , t RZH(SHDN)
3V
0
V CC
V OL
0.25V
RO
RE 1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
t RLZ
3V
0
V OH
0
0.25V
1.5V
RO
RE
S1 OPEN
S2 CLOSED
S3 = +1.5V
t RHZ
S3
RO
RO
Figure 7. Receiver Enable and Disable Times
Test Circuits/Timing Diagrams (continued)