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參數資料
| 型號： | 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時鐘扇出緩沖器 |
| 文件頁數： | 10/14頁 |
| 文件大?。?/td> | 565K |
| 代理商： | ASM2I99447 |
May 2005
rev 0.3
T
J
,MAX should be selected according to the MTBF
system requirements and Table 9. R
thja
can be derived
from Table 10. The R
thja
represent data based on 1S2P
boards, using 2S2P boards will result in a lower thermal
impedance than indicated below.
ASM2I99447
3.3V/2.5V 1:9 LVCMOS Clock Fanout Buffer
Notice: The information in this document is subject to change without notice.
10 of 14
Table 10. Thermal package impedance of the
32LQFP
Convection,
LFPM
Still air
100 lfpm
200 lfpm
300 lfpm
400 lfpm
R
thja
(1P2S
board),
°
C/W
86
76
71
68
66
R
thja
(2P2S
board),
°
C/W
61
56
54
53
52
If the calculated maximum frequency is below 350 MHz, it
becomes the upper clock speed limit for the given
application conditions. The following eight derating charts
describe the safe frequency operation range for the
ASM2I99447. The charts were calculated for a maximum
tolerable die junction temperature of 110
°
C (120
°
C),
corresponding to an estimated MTBF of 9.1 years
(4 years), a supply voltage of 3.3V and series terminated
transmission line or capacitive loading. Depending on a
given set of these operating conditions and the available
device convection a decision on the maximum operating
frequency can be made.
0
500
400
300
200
100
0
Convection Ifpm
50
100
150
200
250
300
350
O
Safe operation
f
MAX
(AC)
T
A
= 85
°
C
Figure 13. Maximum ASM2I99447 frequency V
CC
=
3.3V, MTBF 9.1 years, driving series terminated
transmission lines, 2s2p board
0
500
400
300
200
100
0
Convection Ifpm
50
100
150
200
250
300
350
O
Safe operation
f
MAX
(AC)
T
A
= 75
°
C
T
A
= 85
°
C
Figure 14. Maximum ASM2I99447
frequency V
CC
= 3.3V, MRBF 9.1 years,
4pF load per line, 2s2p board
0
500
400
300
200
100
0
Convection Ifpm
50
100
150
200
250
300
350
O
Safe operation
f
MAX
(AC)
T
A
= 85
°
C
Figure 16. Maximum ASM2I99447
frequency V
CC
= 3.3V, MRBF 4 years, 4pF
load per line, 2s2p board
0
500
400
300
200
100
0
Convection Ifpm
50
100
150
200
250
300
350
O
Safe operation
f
MAX
(AC)
Figure 15. No maximum frequency limitation for V
CC
= 3.3V, MTBF 4 years, driving series terminated
transmission lines, 2s2p board
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| ASM2I99448G-32-LR | CAP CERM 470PF 500V X7R 10% 1206 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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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