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參數資料
| 型號： | ASM2I9942PG-32-LT |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | 時鐘及定時 |
| 英文描述： | Low Voltage 1:18 Clock Distribution Chip |
| 中文描述： | 9942 SERIES, LOW SKEW CLOCK DRIVER, 18 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32 |
| 封裝： | 7 X 7 MM, 0.80 MM PITCH, GREEN, LQFP-32 |
| 文件頁數： | 5/10頁 |
| 文件大?。?/td> | 433K |
| 代理商： | ASM2I9942PG-32-LT |
May 2005
rev 0.3
Power Consumption of the ASM2I9942P and
Thermal Management
ASM2I9942P
Low Voltage 1:18 Clock Distribution Chip
5 of 10
Notice: The information in this document is subject to change without notice.
The ASM2I9942P AC specification is guaranteed for the
entire operating frequency range up to 250MHz. The
ASM2I9942P 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
ASM2I9942P die junction temperature and the associated
device reliability.
Table 8. 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 ASM2I9942P
needs to be controlled and the thermal impedance of the
board/package should be optimized.The power dissipated
in the ASM2I9942P is represented in equation 1.
Where I
CCQ
is the static current consumption of the
ASM2I9942P, C
PD
is the power dissipation capacitance
+
=
per output,
(Μ)Σ
C
L
represents the external capacitive
output load, N is the number of active outputs (N is
always 12 in case of the ASM2I9942P). The
ASM2I9942P 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 R
thja
is the thermal impedance of the package
(junction to ambient) and T
A
is the ambient temperature.
According to Table 8, 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 ASM2I9942P 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PDF資料 |
PDF描述 |
|---|---|
| ASM2I99446-32-LR | 2.5V and 3.3V LVCMOS Clock Distribution Buffer |
| ASM2I99446-32-LT | 2.5V and 3.3V LVCMOS Clock Distribution Buffer |
| ASM2I99446 | 2.5V and 3.3V LVCMOS Clock Distribution Buffer |
| ASM2I99446-32-ER | Aluminum Electrolytic Capacitor; Capacitor Type:Motor Start/Motor Run; Voltage Rating:450VDC; Capacitor Dielectric Material:Aluminum Electrolytic; Operating Temperature Range:-40 C to +85 C; Capacitance:11000uF RoHS Compliant: Yes |
| ASM2I99446-32-ET | Aluminum Electrolytic Capacitor; Capacitor Type:Motor Start/Motor Run; Voltage Rating:200VDC; Capacitor Dielectric Material:Aluminum Electrolytic; Operating Temperature Range:-40 C to +85 C; Capacitance:5700uF RoHS Compliant: Yes |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ASM2I99446 | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:2.5V and 3.3V LVCMOS Clock Distribution Buffer |
| ASM2I99446-32-ER | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:2.5V and 3.3V LVCMOS Clock Distribution Buffer |
| ASM2I99446-32-ET | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:2.5V and 3.3V LVCMOS Clock Distribution Buffer |
| ASM2I99446-32-LR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:2.5V and 3.3V LVCMOS Clock Distribution Buffer |
| ASM2I99446-32-LT | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:2.5V and 3.3V LVCMOS Clock Distribution Buffer |
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