MC68F375
ELECTRICAL CHARACTERISTICS
MOTOROLA
REFERENCE MANUAL
Rev. 25 June 03
E-2
E.3 Thermal Characteristics
E.4 DC Characteristics
Table E-2 Thermal Characteristics
Num
Characteristic
Symbol
Value
Unit
1
Thermal Resistance
Thermal Resistance 217 /P4 PBGA Package
ΘJA
TBD
°C/W
The average chip-junction temperature (TJ) in C can be obtained from:
(1)
where:
TA = Ambient Temperature, °C
ΘJA= Package Thermal Resistance, Junction-to-Ambient, °C/W
PD = PINT + PI/O
PINT= IDD × VDD, Watts — Chip Internal Power
PI/O= Power Dissipation on Input and Output Pins — User Determined
For most applications PI/O < PINT and can be neglected. An approximate relationship between PD and TJ
(if PI/O is neglected) is:
(2)
Solving equations 1 and 2 for K gives:
(3)
where K is a constant pertaining to the particular part. K can be determined from equation (3) by measuring
PD (at equilibrium) for a known TA. Using this value of K, the values of PD and TJ can be obtained by solving
equations (1) and (2) iteratively for any value of TA.
Table E-3 DC Characteristics
(VDDH = 5.0 Vdc ± 5%, VDDL = 3.3 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH)
Num
Characteristic
Symbol
Min
Max
Unit
1a
3v Input High Voltage, EPEB0
VIH3
2.0
VDDH + 0.3
V
1b
5v Input High Voltage1
Groups 2 and 7 pins, except EPEB0
Groups 1, 5, and 6 pins
V
IH5
0.7
(V
DDH
)
3.3
V
DDH
+ 0.3
V
DDH
+ 0.3
V
2a
3v Input Low Voltage, EPEB0
VIL3
VSS – 0.3
0.8
V
2b
Groups 2 and 7 pins, except EPEB0
Groups 1, 5, and 6 pins
V
IL5
V
SS
– 0.3
V
SS
– 0.3
0.2
(V
DDH
)
2.3
V
3
Input Hysteresis
BKPT/DSCLK, CTM2C, Port CT, IPIPE/DSO, Port A, Port B,
Port E[7:3], Port F, Port G, Port H, RESET, IFETCH/DSI,
Port TP, T2CLK
V
HYS
0.5
—
V
4
3v and 5v Input Leakage Current
1V
in
= V
DD
or V
SS
all I/O and Input-only pins
I
in
–1.0
1.0
A
5
High Impedance (Off-State) Leakage Current
1V
in
= V
DD
or V
SS
All I/O and Output-only pins
I
OZ
–1.0
1.0
A
T
J
T
A
P
D
Θ
JA
×
()
+
=
P
D
KT
J
273
°C
+
()
÷
=
KP
D
T
A
273
°C
+
() Θ
JA
P
D
2
×
++
=
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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