MC68HC705KJ1CDW Freescale Semiconductor, MC68HC705KJ1CDW Datasheet - Page 86

• Manufacturer Part Number: MC68HC705KJ1CDW
• Description: IC MCU 4MHZ 1.2K OTP 16-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705KJ1CDW

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 10
• Program Memory Size: 1.2KB (1.2K x 8)
• Program Memory Type: OTP
• Ram Size: 64 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -

Electrical Specifications
10.4 Power Considerations
The average chip junction temperature, T
where:
For most applications, P
Ignoring P
Solving equations (1) and (2) for K gives:
where K is a constant pertaining to the particular part. K can be determined from equation (3) by
measuring P
obtained by solving equations (1) and (2) iteratively for any value of T
86
T
θ
P
P
P
JA
A
D
INT
I/O
= ambient temperature in °C
= P
= package thermal resistance, junction to ambient in °C/W
= power dissipation on input and output pins (user-determined)
= I
I/O
INT
CC
, the relationship between P
D
+ P
× V
(at equilibrium) for a known T
I/O
CC
MC68HC705KJ1 • MC68HRC705KJ1 • MC68HLC705KJ1 Data Sheet, Rev. 4.1
= chip internal power dissipation
= P
I/O
D
x (T
T J
A
P D
P
+ 273°C) + ΘJ
INT
=
=
T A
and can be neglected.
-----------------------------------
T J
+
(
D
+
P D
J
, in °C can be obtained from:
K
and T
273 °C
A
A
. Using this value of K, the values of P
×
x (P
θ
J
JA
is approximately:
D
)
)
A
.
(1)
(2)
(3)
Freescale Semiconductor
D
and T
J
can be