MC68L300 Datasheet, PDF (4/32 Pages) Freescale Semiconductor, Inc – 16.78 MHz Electrical Characteristics

Freescale Semiconductor, Inc.
Table 3 MC68L332 Typical Ratings
Num
1 Supply Voltage
Rating
2 Operating Temperature
V_DD Supply Current
3
RUN
LPSTOP, External clock, max f_sys
4 Clock Synthesizer Operating Voltage
5
V_DDSYN Supply Current
External Clock, maximum f_sys
RAM Standby Current
6
Normal RAM operation
Standby operation
7 Power Dissipation
Symbol
V_DD
T_A
I_DD
V_DDSYN
I_DDSYN
I_SB
P_D
Value
3.3
25
45
1.0
3.3
2.0
3.0
10
148.0
Unit
V
°C
mA
mA
V
mA
µA
µA
mW
Table 4 Thermal Characteristics
Num
Rating
Symbol
Value
Unit
Thermal Resistance
1
Plastic 132-Pin Surface Mount
Plastic 144-Pin Surface Mount
Θ_JA
38
49
°C/W
The average chip-junction temperature (TJ) in C can be obtained from:
T_J = T_A + (P_D × Θ_JA) ⁽¹⁾
where:
T_A = Ambient Temperature, °C
Θ_JA= Package Thermal Resistance, Junction-to-Ambient, °C/W
P_D = P_INT + P_I/O
P_INT= I_DD × V_DD, Watts — Chip Internal Power
P_I/O= Power Dissipation on Input and Output Pins — User Determined
For most applications P_I/O < P_INT and can be neglected. An approximate relationship between P_D and T_J (if P_I/O is
neglected) is:
P_D = K ÷ (T_J + 273°C) ⁽²⁾
Solving equations 1 and 2 for K gives:
K = P_D + (T_A + 273°C) + Θ_JA × P_D2 ⁽³⁾
where K is a constant pertaining to the particular part. K can be determined from equation (3) by measuring P_D (at
equilibrium) for a known T_A. Using this value of K, the values of P_D and T_J can be obtained by solving equations (1)
and (2) iteratively for any value of T_A.
4
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MC68L300EC16/D