Datasheet

Electrical Specifications
Technical Data MC68HC912DT128A — Rev 4.0
440 Electrical Specifications MOTOROLA
Table 21-16. CGM Characteristics
5.0 Volts +/- 10%
Characteristic Symbol Min. Max. Unit
PLL reference frequency
f
REF
0.5 8 MHz
Bus frequency
f
BUS
0.004 8 MHz
VCO range
f
VCO
2.5 8 MHz
VCO Limp-Home frequency
f
VCOMIN
0.5 2.5 MHz
Lock Detector transition from Acquisition to Tracking mode
∆
trk
3% 4% —
Lock Detection
∆
Lock
0% 1.5% —
Un-Lock Detection
∆
unl
0.5% 2.5% —
Lock Detector transition from Tracking to Acquisition mode
∆
unt
6% 8% —
PLLON Stabilization delay
(1)
PLLON Total Stabilization delay
(2)
t
stab
3ms
PLLON Acquisition mode stabilization delay
(3)
t
acq
1ms
PLLON Tracking mode stabilization delay
(3)
t
al
2ms
1. PLL stabilization delay is highly dependent on operational requirement and external component values (e.e. crystal, XFC
filter component values). Note (2) shows typical delay values for a typical configuration. Appropriate XFC filter values
should be chosen based on operational requirement of system.
2. f
REF
= 4MHz, f
SYS
= 8MHz (REFDV = #$00, SYNR = #$01), XFC: Cs = 33nF, Cp - 3.3nF, Rs = 2.7KΩ.
Table 21-17. Oscillator Characteristics
MC68HC912DT128A MC68HC912Dx128C MC68HC912Dx128P Unit
Input buffer hysteresis
(1)
Min
Max
0
50
75
350
75
350
mV
Resonator Frequency
(2)
(VDDPLL=VDD)
Min
Max
0.5
8
0.5
8
0.5
8
MHz
Resonator Frequency
(2)
(VDDPLL=0V)
Min
Max
4
10
4
10
0.5
16
MHz
1. These values are dervied from design simulation and are not tested
2. Specifications apply to quartz or ceramic resonators only
Table 21-18. STOP Key Wake-up Filter
Characteristic Symbol Min. Max. Unit
STOP Key Wake-Up Filter time t
KWSTP
210µs
STOP Key Wake-Up Filter pulse interval t
KWSP
20 - µs
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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