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參數(shù)資料
| 型號(hào)： | ASM2I99447 |
| 廠商： | Alliance Semiconductor Corporation |
| 英文描述： | 3.3V/2.5V 1:9 LVCMOS Clock Fanout Buffer |
| 中文描述： | 3.3V/2.5V 1:9的LVCMOS時(shí)鐘扇出緩沖器 |
| 文件頁(yè)數(shù)： | 9/14頁(yè) |
| 文件大?。?/td> | 565K |
| 代理商： | ASM2I99447 |
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May 2005
rev 0.3
Power Consumption of the ASM2I99447 and
Thermal Management
ASM2I99447
3.3V/2.5V 1:9 LVCMOS Clock Fanout Buffer
Notice: The information in this document is subject to change without notice.
9 of 14
The ASM2I99447 AC specification is guaranteed for the
entire operating frequency range up to 350MHz. The
ASM2I99447 power consumption and the associated
long-term reliability may decrease the maximum
frequency limit, depending on operating conditions such
as clock frequency, supply voltage, output loading,
ambient temperature, vertical convection and thermal
conductivity of package and board. This section
describes the impact of these parameters on the junction
temperature and gives a guideline to estimate the
ASM2I99447 die junction temperature and the associated
device reliability.
Table 9. Die junction temperature and MTBF
Junction temperature
(
°
C)
MTBF (Years)
100
110
120
130
20.4
9.1
4.2
2.0
Increased power consumption will increase the die
junction temperature and impact the device reliability
(MTBF). According to the system-defined tolerable
MTBF, the die junction temperature of the ASM2I99447
needs to be controlled and the thermal impedance of the
board/package
should
be
dissipated in the ASM2I99447 is represented in
equation 1.Where I
CCQ
is the static current consumption
of the ASM2I99447, C
PD
is the power dissipation
capacitance per output,
(Μ)Σ
C
L
represents the external
+
=
optimized.
The
power
capacitive output load, N is the number of active outputs
(N is always 12 in case of the ASM2I99447). The
ASM2I99447 supports driving transmission lines to
maintain high signal integrity and tight timing parameters.
Any transmission line will hide the lumped capacitive load
at the end of the board trace, therefore,
Σ
C
L
is zero for
controlled transmission line systems and can be
eliminated from equation 1. Using parallel termination
output termination results in equation 2 for power
dissipation.
In equation 2, P stands for the number of outputs with a
parallel or thevenin termination, V
OL
, I
OL
, V
OH
and I
OH
are
a function of the output termination technique and DC
Q
is
the clock signal duty cycle. If transmission lines are used
Σ
C
L
is zero in equation 2 and can be eliminated. In
general, the use of controlled transmission line
techniques eliminates the impact of the lumped capacitive
loads at the end lines and greatly reduces the power
dissipation of the device. Equation 3 describes the die
junction temperature T
J
as a function of the power
consumption.
Where Rthja is the thermal impedance of the package
(junction to ambient) and TA is the ambient temperature.
According to Table 9, the junction temperature can be
used to estimate the long-term device reliability. Further,
combining equation 1 and equation 2 results in a
maximum operating frequency for the ASM2I99447 in a
series terminated transmission line system, equation 4
(
)
(
+
)
[
]
(
)
4
1
N
3
2
1
1
2
Equation
V
I
R
T
T
V
C
f
Equation
R
P
T
T
Equation
V
I
DC
V
V
I
DC
C
C
N
f
V
I
V
P
Equation
V
C
C
N
f
V
I
P
CC
CCQ
thja
A
JMAX
CC
PD
CLOCKMAX
thja
TOT
A
J
OL
OL
Q
OH
CC
OH
Q
L
PD
CLOCK
CC
CCQ
CC
TOT
CC
L
PD
CLOCK
CC
CCQ
TOT
=
+
=
+
+
+
=
∑
+
∑
∑
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ASM2I99448G-32-ER | 3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer |
| ASM2I99448G-32-ET | 3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer |
| ASM2I99448G-32-LR | CAP CERM 470PF 500V X7R 10% 1206 |
| ASM2I99448G-32-LT | 3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer |
| ASM2I99448 | 3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ASM2I99448 | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer |
| ASM2I99448-32-ER | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer |
| ASM2I99448-32-ET | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer |
| ASM2I99448-32-LR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer |
| ASM2I99448-32-LT | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer |
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