ADM485E/ADM487E/ADM1487E
Rev. B | Page 4 of 16
TIMING SPECIFICATIONS
V
CC
= 5 V ± 10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Table 3. ADM485E/ADM1487E
Parameter Symbol Min Typ Max Unit Test Conditions/Comments
DRIVER
Driver Propagation Delay Input to Output, Low to High t
DPLH
10 40 60 ns R
DIFF
= 54 Ω, C
L1
= C
L2
= 100 pF
(see
Figure 19 and Figure 20)
Driver Propagation Delay Input to Output, High to Low
t
DPHL
10 40 60 ns R
DIFF
= 54 Ω, C
L1
= C
L2
= 100 pF
(see
Figure 19 and Figure 20)
Output Skew to Output t
SKEW
5 10 ns R
DIFF
= 54 Ω, C
L1
= C
L2
= 100 pF
(see
Figure 19 and Figure 20)
Rise/Fall Time t
DR
, t
DF
3 20 40 ns R
DIFF
= 54 Ω, C
L1
= C
L2
= 100 pF
(see
Figure 19 and Figure 20)
Enable Time to High Level t
DZH
45 70 ns
C
L
= 100 pF, S1 closed (see Figure 21)
Enable Time to Low Level t
DZL
45 70 ns
C
L
= 100 pF, S1 closed (see Figure 22)
Disable Time from Low Level t
DLZ
45 70 ns
C
L
= 15 pF, S1 closed (see Figure 22)
Disable Time from High Level t
DHZ
45 70 ns
C
L
= 15 pF, S1 closed (see Figure 21)
RECEIVER
Receiver Propagation Delay Input to Output, Low to High t
RPLH
20 60 200 ns
See
Figure 23 and Figure 24
Receiver Propagation Delay Input to Output, High to Low t
RPHL
20 60 200 ns
See
Figure 23 and Figure 24
|t
PLH
− t
PHL
| Differential Receiver Skew t
SKEW
5 ns
See
Figure 23 and Figure 24
Enable Time to Low Level t
RZL
25 50 ns
C
L
= 15 pF, S2 closed (see Figure 25)
Enable Time to High Level t
RZH
20 50 ns
C
L
= 15 pF, S1 closed (see Figure 25)
Disable Time from Low Level t
RLZ
20 50 ns
C
L
= 15 pF, S2 closed (see Figure 25)
Disable Time from High Level t
RHZ
20 50 ns t
PLH
, t
PHL
< 50% of data period
MAXIMUM DATA RATE f
MAX
2.5 Mbps
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