DS89C386TMEA National Semiconductor, DS89C386TMEA Datasheet - Page 7

• Manufacturer Part Number: DS89C386TMEA
• Description: Line Receiver IC
• Manufacturer: National Semiconductor

Specifications of DS89C386TMEA

• Termination Type: SMD
• Driver Case Style: SSOP
• No. Of Pins: 48
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C To +85°C
• Supply Voltage Min: 4.5V
• Output Current Max: 25mA
• No. Of Driver/receivers: 0/1
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Application Information
skew. Because, for single-ended skew, when V
V1 and V2, t
the crossing point.
More information can be calculated from the propagation de-
lays. The channel to channel and device to device skew may
be calculated in addition to the types of skew mentioned pre-
viously. These parameters provide timing performance infor-
mation beneficial when designing. The channel to channel
skew is calculated from the variation in propagation delay
from receiver to receiver within one package. The device to
device skew is calculated from the variation in propagation
delay from one DS89C386 to another DS89C386.
For the DS89C386, the maximum channel to channel skew
is 20 ns (t
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
pendently characterized and specified in the datasheet. The
Typical Performance Characteristics
Receiver Input Voltage vs
Receiver Input Current
(Notes 6, 7)
Note 6: The DS89C386 is V.11 compatible. I
conditions.
Note 7: Failsafe (open inputs) is maintained over entire common mode range and operating range
DS89C386 Equivalent Input/Output Circuits
p
max — t
PHL
equals t
p
min) where t
PHLD
when t
p
SK
is the low to high or high
IN
PHLD
(RI input) is not
(channel) is not inde-
FIGURE 9. Receiver Input Equivalent Circuit
(Continued)
is measured from
REF
0 when V
equals
IN
= 3V due to internal failsafe bias resistors (see Figure 6 ). See ITU V.11 for complete
7
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.
Note t
Also, t
guaranteed by the propagation delay tests. Both t
nel) and t
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.
t
t
t
SK
SK
SK
Parameter
(diff.)
(channel)
(device)
SK
SK
DS012085-14
(diff.) in Table 1 is the same as t
(channel) and t
SK
DS012085-15
±
TABLE 1. DS89C386 Skew Table
10V.
(device) would normally be tighter whenever
Min
0
0
0
SK
(device) are calculations, but are
Typ
2
SK
Max
20
20
4
in the datasheet.
www.national.com
SK
Units
ns
ns
ns
(chan-