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ASM2I99448 Datasheet(PDF) 9 Page - Alliance Semiconductor Corporation

Part # ASM2I99448
Description  3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer
PDF  15 Pages
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Manufacturer  ALSC [Alliance Semiconductor Corporation]
Direct Link  https://www.alliancememory.com
Logo ALSC - Alliance Semiconductor Corporation

ASM2I99448 Datasheet(HTML) 9 Page - Alliance Semiconductor Corporation

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May 2005
ASM2I99448
rev 0.3
3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer
9 of 15
Notice: The information in this document is subject to change without notice.
TJ, MAX should be selected according to the MTBF
system requirements and Table 9. Rthja can be derived
from Table 10. The Rthja represent data based on 1S2P
boards, using 2S2P boards will result in lower thermal
impedance than indicated below.
Table 10. Thermal package impedance of the
32LQFP
Convection,
LFPM
Rthja (1P2S
board), °C/W
Rthja (2P2S
board), °C/W
Still air
86
61
100 lfpm
76
56
200 lfpm
71
54
300 lfpm
68
53
400 lfpm
66
52
500 lfpm
60
49
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
ASM2I99448. 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
Safe operation
fMAX (AC)
TA = 85°C
Figure 5. Maximum ASM2I99448 frequency VCC =
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
Safe operation
fMAX (AC)
TA = 75°C
TA = 85°C
Figure 6. Maximum ASM2I99448 frequency
VCC= 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
Safe operation
fMAX (AC)
TA = 85°C
Figure 8. Maximum ASM2I99448
frequency VCC = 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
Safe operation
fMAX (AC)
Figure 7. No maximum frequency limitation for
VCC = 3.3V, MTBF 4 years, driving series terminated
transmission lines, 2s2p board



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