MC68HC705C9ACFN Freescale Semiconductor, MC68HC705C9ACFN Datasheet - Page 94

• Manufacturer Part Number: MC68HC705C9ACFN
• Description: IC MCU 2.1MHZ 16K OTP 44-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705C9ACFN

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 24
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: OTP
• Ram Size: 352 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

Electrical Specifications
12.4 Power Considerations
The average chip-junction temperature, T
where:
For most applications P
The following is an approximate relationship between 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
94
V
PA7–PA0
PB7–PB0
PC7–PC0
PD5–PD0, PD7
T
T
θ
P
P
P
P
K = P
DD
JA
J
A
D
INT
I
D
/
O
= T
= Ambient temperature, °C
= P
= K ÷ (T
= 4.5 V
= Package thermal resistance, junction to ambient, °C/W
= Power dissipation on input and output pins (user determined)
Pins
= I
D
A
INT
DD
D
×
+ (P
(at equilibrium) for a known T
(T
+ P
×
A
V
J
D
+ 273 °C)
+ 273 °C) + θ
DD
I
/
×
O
θ
watts (chip internal power)
3.26 Ω
JA
R1
I
)
/
O
« P
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
INT
2.38 Ω
JA
R2
and can be neglected.
×
TEST
POINT
(P
D
)
2
50 pF
Figure 12-1. Test Load
C
J
, in °C, can be obtained from:
A
. Using this value of K, the values of P
C
(SEE TABLE)
V
D
DD
and T
V
PA7–PA0
PB7–PB0
PC7–PC0
PD5–PD0, PD7
DD
R2
SEE TABLE
R1
(SEE TABLE)
= 3.0 V
J
Pins
(neglecting P
A
.
10.91 Ω
R1
J
):
D
Freescale Semiconductor
and T
6.32 Ω
R2
J
can be
50 pF
C
(1)
(2)
(3)