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MC100ES8111 Datenblatt(PDF) 6 Page - Motorola, Inc

Teilenummer MC100ES8111
Bauteilbeschribung  Low Voltage 1:10 Differential HSTL Clock Fanout Buffer
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Hersteller  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC100ES8111 Datenblatt(HTML) 6 Page - Motorola, Inc

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Advanced Clock Drivers Device Data
6
Freescale Semiconductor
MC100ES8111
Freescale Confidential Proprietary
NDA Required / Preliminary
APPLICATIONS INFORMATION
Test Reference and Output Termination
The MC100ES8111 is designed for high-frequency and
low-skew clock distribution. The high-speed differential
outputs are capable of driving 50
Ω transmission lines and
always require a DC termination to VTT (GND). In order to
maintain the tight skew and timing specifications, it is
recommend to terminate the differential outputs by 50
Ω to
GND, with the termination resistor located as close as
possible to the end of the clock transmission line. All DC and
AC specifications apply to this termination method (see the
reference circuit shown in Figure 3 “MC100ES8111 AC Test
Reference”). The MC100ES8111 does not support an output
termination to VTT = VX = 0.75 V (center voltage termination).
Figure 3. MC100ES8111 AC Test Reference
Power Consumption and the Junction Temperature
The power consumption PTOT of the MC100ES8111
depends on the supply voltages and the DC output
termination. The clock frequency has a negligible effect on
PTOT. If all outputs are terminated by 50 Ω to GND, the device
power consumption is calculated by:
PTOT = VCC · ICC + ICCO · (VCCO - VX)
For instance, at a supply voltage of VCC = 3.3 V and a
termination of 50
Ω to GND, the typical device power
consumption is 579 mW at VCCO = 1.8 V and 474 mW at
VCCO = 1.5 V.
To make the optimum use of high clock frequency and low
skew capabilities of the MC100ES8111, the device is
specified, characterized and tested for the junction
temperature range of TJ = 0°C to +110°C. Because the exact
thermal performance depends on the PCB type, design,
thermal management and natural or forced air convection,
the junction temperature provides an exact way to correlate
the application specific conditions to the published
performance data of this datasheet. The correlation of the
junction temperature range to the application ambient
temperature range and vice versa can be done by
calculation:
TJ = TA + Rthja · Ptot
Assuming a thermal resistance (junction to ambient) of
54.4°C/W (2s2p board, 100 ft/min airflow, see Table 8) and a
typical power consumption of 575 mW (all outputs terminated
50 ohms to GND, VCCO = 1.8 V), the junction temperature of
the MC100ES8111 is approximately TA + 31°C, and the
minimum ambient temperature in this example case
calculates to -31°C (the maximum ambient temperature
is 79°C. See Table 8). Exceeding the minimum junction
temperature specification of the MC100ES8111 does not
have a significant impact on the device functionality.
However, the continuous use the MC100ES8111 at high
ambient temperatures requires thermal management to not
exceed the specified maximum junction temperature.
Maintaining Lowest Device Skew
The MC100ES8111 guarantees low output-to-output skew
of max. 80 ps and a part-to-part skew of max. 630 ps
(VCCO = 1.8 V). To ensure low skew clock signals in the
application, both outputs of any differential output pair need
to be terminated identically, even if only one output is used.
When fewer than all ten output pairs are used, identical
termination of all output pairs within the output bank (same
package side) is recommended. If an entire output bank is not
used, it is recommended to leave all of these outputs open
and unterminated. This will reduce the device power
consumption while maintaining minimum output skew.
Z = 50
RT = 50 Ω
DUT
MC100ES8111
Differential Pulse
Generator
Z = 50
RT = 50 Ω
VTT = GND
VTT = GND
VCC = 3.3 V ± 5%
VCCO = 1.8 V ± 0.1 V or 1.5 V ± 0. 1 V
Z = 50
Oscilloscope
or Tester
Table 7. Power Consumption
MC100ES8111
PTOT, TYP
(1)
1. Typical case: VCC, VCCO at nominal values and using typical
ICC, ICCO data.
PTOT, MAX
(2)
2. Worst case: VCC, VCC at max. values and using max. ICC, ICCO
limits.
VCCO = 1.5 V
470 mW
647 mW
VCCO = 1.8 V
575 mW
769 mW
Table 8. Ambient Temperature Ranges (Ptot = 575 mW)
Rthja (2s2p board)
TA, min
(1)
1. The MC100ES8111 device function is guaranteed from
TA = -40°C to TJ = 110°C.
TA, max
Natural convection
59.0
°C/W
-34
°C
76
°C
100 ft/min
54.4
°C/W
-31
°C
79
°C
200 ft/min
52.5
°C/W
-30
°C
80
°C
400 ft/min
50.4
°C/W
-29
°C
81
°C
800 ft/min
47.8
°C/W
-27.5
°C
82.5
°C


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