MC10H641FN ON Semiconductor, MC10H641FN Datasheet - Page 6

• Manufacturer Part Number: MC10H641FN
• Description: IC CLOCK DRV 1:9 PECL-TTL 28PLCC
• Manufacturer: ON Semiconductor
• Type: Fanout Buffer (Distribution)r

Specifications of MC10H641FN

• Number Of Circuits: 1
• Ratio - Input:output: 1:9
• Differential - Input:output: Yes/Yes
• Input: PECL
• Output: TTL
• Frequency - Max: 65MHz
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-PLCC
• Frequency-max: 65MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

propagation delay for the device in question. A more
common use would be to establish an ambient temperature
range for the H641’s in the system and utilize the above
methodology to determine the potential increased skew of
the distribution network. Note that for this information if the
T
would not be required. If the curve were linear over all
temperatures a simple temperature coefficient could be
provided.
V
delay dependence with V
a system will have a direct impact on the total skew of the
clock distribution network. When calculating the skew
between two devices on a single board it is very likely an
assumption of identical V
number provided in the data sheet for part−to−part skew
would be overly conservative. By using Figure 4 the skew
given in the data sheet can be reduced to represent a smaller
or zero variation in V
specified V
window on the data sheet can be reduced by 270 ps if the
devices in question will always experience the same V
The distribution of the propagation delay ranges given in the
data sheet is actually a composite of three distributions
whose means are separated by the fixed difference in
CC
PD
TTL and CMOS devices show a significant propagation
versus Temperature curve were linear the calculations
Dependence
Figure 3. T
6.4
6.2
6.0
5.8
5.6
5.4
5.2
−30
CC
−10
variation is ≈ 270 ps. Therefore, the 1 ns
PD
10
versus Junction Temperature
JUNCTION TEMPERATURE (
CC
CC
. The delay variation due to the
CC
30
. Therefore the V
’s can be made. In this case the
50
70
T
PHL
90
°C)
CC
T
PLH
110
variation in
http://onsemi.com
130
CC
.
6
propagation delay at the typical, minimum and maximum
V
Capacitive Load Dependence
intimately tied to variation in the load capacitance. The skew
specifications given in the data sheet, of course, assume
equal loading on all of the outputs. However situations could
arise where this is an impossibility and it may be necessary
to estimate the skew added by asymmetric loading. In
addition the propagation delay numbers are provided only
for 50 pF loads, thus necessitating a method of determining
the propagation delay for alternative loads.
propagation delays with respect to the capacitive load on the
output. Utilizing this graph and the 50 pF limits the
specification of the H641 can be mapped into a spec for
either a different value load or asymmetric loads.
CC
As with V
Figure 5 shows the relationship between the two
.
−100
−140
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
140
100
−20
−60
60
20
4.75
0
MEASURED
CC
10
THEORETICAL
Figure 4. DT
Figure 5. T
T
PHL
the propagation delay of a TTL output is
4.85
CAPACITIVE LOAD (pF)
20
30
4.95
T
PD
PHL
40
PD
VCC (V)
versus Load
versus V
50
5.05
60
CC
70
5.15
80
T
PLH
T
PLH
90 100
5.25