ADM485E/ADM487E/ADM1487E
Rev. B | Page 5 of 16
V
CC
= 5 V ± 10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Table 4. ADM487E
Parameter Symbol Min Typ Max Unit Test Conditions/Comments
DRIVER
Driver Propagation Delay Input to Output, Low to High t
DPLH
250 800 2000 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
250 800 2000 ns R
DIFF
= 54 Ω, C
L1
= C
L2
= 100 pF
(see
Figure 19 and Figure 20)
Output Skew to Output t
SKEW
250 20 800 ns R
DIFF
= 54 Ω, C
L1
= C
L2
= 100 pF
(see
Figure 19 and Figure 20)
Rise/Fall Time t
DR
, t
DF
250 2000 ns R
DIFF
= 54 Ω, C
L1
= C
L2
= 100 pF
(see
Figure 19 and Figure 20)
Enable Time to High Level t
DZH
250 2000 ns
C
L
= 100 pF, S1 closed (see Figure 21)
Enable Time to Low Level t
DZL
2000 ns
C
L
= 100 pF, S1 closed (see Figure 22)
Disable Time from Low Level t
DLZ
300 3000 ns
C
L
= 15 pF, S1 closed (see Figure 22)
Disable Time from High Level t
DHZ
300 3000 ns
C
L
= 15 pF, S1 closed (see Figure 21)
RECEIVER
Receiver Propagation Delay Input to Output, Low to High t
RPLH
250 2000 ns
See
Figure 23 and Figure 24
Receiver Propagation Delay Input to Output, High to Low t
RPHL
250 2000 ns
See
Figure 23 and Figure 24
|t
PLH
− t
PHL
| Differential Receiver Skew t
SKEW
100 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
25 50 ns
C
L
= 15 pF, S1 closed (see Figure 25)
Disable Time from Low Level t
RLZ
25 50 ns
C
L
= 15 pF, S2 closed (see Figure 25)
Disable Time from High Level t
RHZ
25 50 ns t
PLH
, t
PHL
< 50% of data period
Maximum Data Rate f
MAX
250 kbps
Time to Shutdown
1
t
SHDN
50 200 600 ns
Driver Enable from Shutdown to Output High t
DZH(SHDN)
5000 ns
C
L
= 100 pF, S1 closed (see Figure 21)
Driver Enable from Shutdown to Output Low t
DZL(SHDN)
5000 ns
C
L
= 100 pF, S1 closed (see Figure 22)
Receiver Enable from Shutdown to Output High t
RZH(SHDN)
5000 ns
C
L
= 15 pF, S2 closed (see Figure 25)
Receiver Enable from Shutdown to Output Low t
RZL(SHDN)
5000 ns
C
L
= 15 pF, S1 closed (see Figure 25)
1
The ADM487E is put into shutdown mode by bringing
RE
high and DE low. If the inputs are in this state for less than 50 ns, the parts are guaranteed not to enter
shutdown. If the inputs are in this state for at least 600 ns, the ADM487E is guaranteed to enter shutdown.
