MPC961C View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
MPC961C Datasheet PDF : 12 Pages
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MPC961C
Freescale Semiconductor, Inc.
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 MPC961C in a series terminated
transmission line system.
Table 10: Thermal package impedance of the 32ld
LQFP
Convection, LFPM
Still air
100 lfpm
200 lfpm
300 lfpm
400 lfpm
500 lfpm
Rthja (1P2S board), K/W
80
70
61
57
56
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 operating 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 (corresponding to a max. junction
temperature of 120°C.
200
fMAX (AC)
180
TA = 85°C
160
140
120
100
80
60
Safe operation
40
20
0
500
400
300
200
100
0
IFPM, CONVECTION
200
fMAX (AC)
180
TA = 75°C
160
140
TA = 85°C
120
100
80
60
Safe operation
40
20
0
500
400
300
200
100
0
IFPM, CONVECTION
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
Pulse
W Generator
Z = 50
ZO = 50Ω
MPC961C DUT
ZO = 50Ω
RT = 50Ω
RT = 50Ω
VTT
VTT
Figure 11. TCLK MPC961C AC test reference for Vcc = 3.3V and Vcc = 2.5V
MOTOROLA
For More Informa8tion On This Product,
Go to: www.freescale.com
TIMING SOLUTIONS
DL207 — Rev 0
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