MPC961C Motorola, MPC961C Datasheet - Page 8

• Manufacturer Part Number: MPC961C
• Description: LOW VOLTAGE ZERO DELAY
• Manufacturer: Motorola

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MPC961C
(junction to ambient) and T A 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.
Figure 9. Maximum MPC961C frequency, V CC = 3.3V, MTBF
MOTOROLA
Table 10: Thermal package impedance of the 32ld
LQFP
Where R thja is the thermal impedance of the package
9.1 years, driving series terminated transmission lines
200
180
160
140
120
100
80
60
40
20
0
Convection, LFPM
500
100 lfpm
200 lfpm
300 lfpm
400 lfpm
500 lfpm
Still air
400
Safe operation
Figure 11. TCLK MPC961C AC test reference for V cc = 3.3V and V cc = 2.5V
Generator
Z = 50
I FPM , CONVECTION
Pulse
300
f MAX (AC)
W
R thja (1P2S board), K/W
Freescale Semiconductor, Inc.
200
For More Information On This Product,
T A = 85 C
80
70
61
57
56
55
Z O = 50
100
R T = 50
Go to: www.freescale.com
V TT
0
MPC961C DUT
8
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.
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.
T J,MAX should be selected according to the MTBF system
If the calculated maximum frequency is below 200 MHz, it
200
180
160
140
120
100
80
60
40
20
0
500
V CC = 3.3V, MTBF 9.1 years, 4 pF load per line
Figure 10. Maximum MPC961C frequency,
Z O = 50
400
Safe operation
I FPM , CONVECTION
R T = 50
300
f MAX (AC)
V TT
T A = 85 C
200
TIMING SOLUTIONS
T A = 75 C
DL207 — Rev 0
100
0