Rainbow Electronics MAX14770E User Manual
Page 8
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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
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