Rainbow Electronics MAX3079E - Manual (Page 11)

MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
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Test Circuits and Waveforms (continued)
V
ID R
B
A
RECEIVER
OUTPUT
ATE
Figure 6. Receiver Propagation Delay Test Circuit
A
B
RO
V OH
1.5V
t RPLH
t RPHL
V OL
+1V
-1V
THE RISE TIME AND FALL TIME OF INPUTS A AND B < 4ns
Figure 7. Receiver Propagation Delays
S1 OPEN
S2 CLOSED
S3 = +1.5V
RO
3V
0
0
V OH
V OH / 2
S1 OPEN
S2 CLOSED
S3 = +1.5V
t RHZ
3V
0
0
V OH
0.25V
1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
3V
0
V OL
V CC
1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
t RLZ
3V
0
V OL
V CC
1.5V
0.25V
GENERATOR
V CC
+1.5V
1k Ω
C L
15pF S2
S1
50 Ω
S3
-1.5V
R V ID
RE
RO
RE
RO
RE
RO
RE
t RZH , t RZH(SHDN)
t RZL , t RZL(SHDN)
(V OL + V CC ) / 2
Figure 8. Receiver Enable and Disable Times