Rainbow Electronics MAX14770E - Manual (Page 8)

High-ESD Profibus RS-485 Transceiver
MAX14770E
8 ______________________________________________________________________________________
Figure 8. Receiver Propagation Delay Test Circuit
Figure 9. Receiver Propagation Delays
Figure 10. Receiver Enable and Disable Times
V
ID
B
A
RECEIVER
OUTPUT
ATE R
A
B
V OH
V OL
RO
t RPHL
t RSKEW = |t RPHL - t RPLH |
t = 1MHz, t LH P 3ns, t HL P 3ns
t RPLH
-1V
1V
2
V CC
2
V CC
GENERATOR 50I
R
1kI
C L
15pF
R
-1.5V
+1.5V
RO
S1
V CC
S2
S3
V ID
RE
RE
RO
RE
RO
RE
RE
RO
RO
0
t RHZ
t RLZ
0.25V
0.25V
1.5V 1.5V
0 0
2
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
V OH
0
0
V OH
V CC
V CC V CC
1.5V 1.5V
V CC
t RZL , t RZL(SHDN)
V OL
0
V CC V CC
V CC
V OL
t RZH, t RZH (SHDN)
2
V CC