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
V2 are less likely to be equal to the crossing point voltage.
Thus, the differential propagation delays will not be mea-
sured from zero volts on the differential waveform.
The differential skew also provides information about the
pulse width distortion of the output waveform relative to the
differential input waveform. The higher the skew, the greater
the distortion of the output waveform. Assuming the differen-
tial input has a 50% duty cycle, the output will have a 50%
duty cycle if skew equals zero and less than a 50% duty
cycle if skew is greater than zero.
Only t
is measured singIe-endedly but corresponds to differential
skew. Because, for single-ended skew, when V
V1 and V2, t
the crossing point.
More information can be calculated from the propagation
delays. The channel to channel and device to device skew
may be calculated in addition to the types of skew mentioned
previously. These parameters provide timing performance
information beneficial when designing. The channel to chan-
nel 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
Typical Performance Characteristics
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
SK
is specified in this datasheet for the DS89C386. t
p
max — t
PHL
equals t
p
min) where t
PHLD
when t
p
is the low to high or high
IN
PHLD
(RI input) is not ≥ 0 when V
(Continued)
is measured from
REF
Receiver Input Voltage vs
Receiver Input Current
equals
SK
(Notes 6, 7)
IN
= 3V due to internal failsafe bias resistors (see Figure 6). See ITU V.11 for complete
7
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
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
(diff.)
(channel)
(device)
Parameter
SK
SK
(diff.) in Table 1 is the same as t
(channel) and t
SK
01208514
±
TABLE 1. DS89C386 Skew Table
10V.
(device) would normally be tighter whenever
Min
SK
0
0
0
(device) are calculations, but are
Typ
2
SK
(channel) is not inde-
SK
Max
20
20
4
in the datasheet.
www.national.com
SK
Units
ns
ns
ns
(chan-