Datasheet

DS89C386
www.ti.com SNLS100C –MAY 1995–REVISED APRIL 2013
For the DS89C386, the maximum channel to channel skew is 20 ns (t
p
max—t
p
min) where t
p
is the low to high
or high to low propagation delay. The minimum channel to channel skew is 0 ns since it is possible for all 12
receivers to have identical propagation delays. Note, this is best and worst case calculations used whenever t
SK
(channel) is not independently characterized and specified in the datasheet. The device to device skew may be
calculated in the same way and the results are identical. Therefore, the device to device skew is 20 ns and 0 ns
maximum and minimum respectively.
Table 1. DS89C386 Skew Table
Parameter Min Typ Max Units
t
SK
(diff.) 0 2 4 ns
t
SK
(channel) 0 20 ns
t
SK
(device) 0 20 ns
Note t
SK
(diff.) in Table 1 is the same as t
SK
in the datasheet. Also, t
SK
(channel) and t
SK
(device) are calculations,
but are ensured by the propagation delay tests. Both t
SK
(channel) and t
SK
(device) would normally be tighter
whenever specified from characterization data.
The information in this section of the datasheet is to help clarify how skew is defined in this datasheet. This
should help when designing the DS89C386 into most applications.
Typical Performance Characteristics
Receiver Input Voltage vs
Receiver Input Current
The DS89C386 is V.11 compatible. I
IN
(RI input) is not ≥ 0 when V
IN
= 3V due to internal failsafe bias resistors (see Figure 10). See
ITU V.11 for complete conditions.
Failsafe (open inputs) is maintained over entire common mode range and operating range ±10V.
Figure 13.
DS89C386 Equivalent Input/Output Circuits
Figure 14. Receiver Input Equivalent Circuit
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