
MC68F375
ELECTRICAL CHARACTERISTICS
MOTOROLA
REFERENCE MANUAL
Rev. 25 June 03
E-29
E.9 CTM9 Electrical Characteristics
The electrical and timing characteristics of the CTM9 are the same as those of other MC68300/
MC68HC16 family MCUs.
E.9.1 5 V, 16.78 MHz Operating Conditions
E.9.2 5 V, 25.0 MHz Operating Conditions
Table E-16 AMUX_HV Conversion Characteristics (Operating)
(VDDI = 3.3 Vdc + 0.3 V, VDDA = 5.0 Vdc + 10%, VSSI and VSSA = 0 Vdc, TA within operating temperature range,
0.5 MHz
≤ FQCLK ≤ 2.1 MHz, 41 clock input sample time, AMUX/QADC64 configured for internal multiplexing only.)
NOTES:
1. Input sample time was increased from the 2 clocks used on channels connected directly to the QADC64 (AN0–AN4, AN48–
AN59) to 4 on extended channels (ANX0–ANX31). This is to compensate for additional series resistance of the AMUX. It is
possible that this can change back to 2 after characterization.
Num
Parameter
Symbol
Min
Typ
Max
Unit
1
Source impedance at input2,3
2. Maximum source impedance is application-dependent. Error resulting from pin leakage depends on junction leakage into the
pin and on leakage due to charge-sharing with internal capacitance.
Error from junction leakage is a function of external source impedance and input leakage current. In the following expression,
expected error in result value due to junction leakage is expressed in voltage (Verrj):
Verrj = RS * IOFF
where IOFF is a function of operating temperature. (See Table E-15, Note 3.). Charge-sharing leakage is a function of input source impedance, conversion rate, change in voltage between successive con-
versions, and the size of the filtering capacitor used. Error levels are best determined empirically. Charge-sharing leakage for
AMUX inputs will be larger due to the increased internal parasitic capacitances. In general, continuous conversion of the same
channel may not be compatible with high source impedance.
3. AMUX/QADC64 configured for internal multiplexing only.
RS
—7.5
—
K
Table E-17 CTM9 5 V, 16.78 MHz Operating Conditions
Condition
Symbol
Min
Typ
Max
Units
Operating Temperature
Temp
-40
+125
°C
Main Supply Voltage
VDD
4.50
5.00
5.50
V
Operating Frequency
Main Clock
Fclk
0
16.78
MHz
Table E-18 CTM9 5 V, 25 MHz Operating Conditions
Condition
Symbol
Min
Typ
Max
Units
Operating Temperature
Temp
-40
+125
°C
Main Supply Voltage
VDD
4.50
5.00
5.50
V
Operating Frequency
Main Clock
Fclk
0
25.0
MHz
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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