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| 型号： | MPC961CFAR2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 时钟及定时 |
| 英文描述： | 961 SERIES, PLL BASED CLOCK DRIVER, 17 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32 |
| 封装： | PLASTIC, LQFP-32 |
| 文件页数： | 8/9页 |
| 文件大小： | 343K |
| 代理商： | MPC961CFAR2 |
5
MPC961C
MOTOROLA ADVANCED CLOCK DRIVERS DEVICE DATA
484
Where Rthja is the thermal impedance of the package (junc-
tion 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 MPC961C in a series terminated transmission line system.
Table 10: Thermal package impedance of the 32ld
LQFP
Convection, LFPM
Rthja (1P2S board), K/W
Still air
80
100 lfpm
70
200 lfpm
61
300 lfpm
57
400 lfpm
56
500 lfpm
55
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 a lower thermal impedance than indicated
below.
If the calculated maximum frequency is below 200 MHz, it
becomes the upper clock speed limit for the given application
conditions. The following two derating charts describe the safe
frequency operation range for the MPC961C. The charts were
calculated for a maximum tolerable die junction temperature of
110
°C, corresponding to an estimated MTBF of 9.1 years, a
supply voltage of 3.3V and series terminated transmission line
or capacitive loading. Depending on a given set of these oper-
ating conditions and the available device convection a decision
on the maximum operating frequency can be made. There are
no operating frequency limitations if a 2.5V power supply or the
system specifications allow for a MTBF of 4 years (corre-
sponding to a max. junction temperature of 120
°C.
Figure 9. Maximum MPC961C frequency, VCC = 3.3V, MTBF
9.1 years, driving series terminated transmission lines
Figure 10. Maximum MPC961C frequency,
VCC = 3.3V, MTBF 9.1 years, 4 pF load per line
200
160
140
120
0
500
400
300
200
100
IFPM, CONVECTION
0
OPERA
TING
FREQUENCY
(MHz)
180
20
TA = 85°C
fMAX (AC)
0
500
400
300
200
100
IFPM, CONVECTION
0
OPERA
TING
FREQUENCY
(MHz)
TA = 75°C
TA = 85°C
fMAX (AC)
Safe operation
40
60
80
100
200
160
140
120
180
20
40
60
80
100
Figure 11. TCLK MPC961C AC test reference for Vcc = 3.3V and Vcc = 2.5V
Pulse
Generator
Z = 50W
RT = 50
ZO = 50
RT = 50
ZO = 50
MPC961C DUT
VTT
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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