MPC855T Просмотр технического описания (PDF) - Motorola => Freescale
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MPC855T Datasheet PDF : 76 Pages
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Thermal Characteristics
(GND = 0 V)
Table 3-2. Maximum Tolerated Ratings
Rating
Symbol
Value
Unit
Supply Voltage 1
VDDH
VDDL
KAPWR
–0.3 to 4.0
V
–0.3 to 4.0
V
–0.3 to 4.0
V
VDDSYN
–0.3 to 4.0
V
Input Voltage 2
Temperature 3 (Standard)
Vin
TA(min)
GND – 0.3 to VDDH
V
0
˚C
Temperature 3 (Extended)
Tj(max)
TA(min)
95
˚C
–40
˚C
Tj(max)
95
˚C
Storage Temperature Range
Tstg
–55 to 150
˚C
1 The power supply of the device must start its ramp from 0.0 V.
2 Functional operating conditions are provided with the DC electrical specifications in Table 6-5. Absolute maximum
ratings are stress ratings only; functional operation at the maxima is not guaranteed. Stress beyond those listed may
affect device reliability or cause permanent damage to the device.
Caution: All inputs that tolerate 5 V cannot be more than 2.5 V greater than the supply voltage. This restriction applies
to power-up and normal operation (that is, if the MPC860 is unpowered, voltage greater than 2.5 V must not be
applied to its inputs).
3 Minimum temperatures are guaranteed as ambient temperature, TA. Maximum temperatures are guaranteed as
junction temperature, Tj.
Part IV Thermal Characteristics
Table 4-3 shows the thermal characteristics for the MPC860.
Table 4-3. MPC860 Thermal Resistance Data
Rating
Environment
Symbol Rev A
Rev
B, C, D
Unit
Junction to Ambient 1 Natural Convection Single layer board (1s)
RθJA 2
31
Four layer board (2s2p) RθJMA 3
20
Air Flow (200 ft/min) Single layer board (1s)
RθJMA3
26
Four layer board (2s2p) RθJMA3
16
Junction to Board 4
RθJB
8
Junction to Case 5
RθJC
5
Junction to Package Top Natural Convection
6
Air Flow (200 ft/min)
Ψ JT
1
2
40
°C/W
25
32
21
15
7
2
3
1 Junction temperature is a function of on-chip power dissipation, package thermal resistance, mounting site (board)
temperature, ambient temperature, air flow, power dissipation of other components on the board, and board thermal
resistance.
MOTOROLA
MPC860 Family Hardware Specifications
7
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