ELECTRICAL CHARACTERISTICS
M68HC16 Z SERIES
A-18
USER’S MANUAL
13. The base configuration of the MC68HC16Z1, MC68CK16Z1, MC68HC16Z4, and the MC68CK16Z4 requires
a 32.768 kHz crystal reference. The base configuration of the MC68CM16Z1, MC68HC16Z2, and the
MC68HC16Z3 requires a 4.194 MHz crystal reference.
14. The RAM module will not switch into standby mode as long as V
SB
does not exceed V
DD
by more than 0.5
volts. The RAM array cannot be accessed while the module is in standby mode.
15. When V
SB
is more than 0.3 V greater than V
DD
, current flows between the V
STBY
and V
DD
pins, which
causes standby current to increase toward the maximum transient condition specification. System noise on
the V
DD
and V
STBY
pin can contribute to this condition.
16. Power dissipation is measured with the appropriate system clock frequency, all modules active. Power dissipation
can be calculated using the following expression:
P
D
= Maximum V
DD
(I
DD
+ I
DDSYN
+ I
SB
) + Maximum V
DDA
(I
DDA
)
I
DD
includes supply currents for all device modules powered by V
DD
pins.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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