8XC196KC/8XC196KC20
EXTERNAL CLOCK DRIVE (8XC196KC20)
Symbol Parameter Min Max Units
1/T
XLXL
Oscillator Frequency 8 20.0 MHz
T
XLXL
Oscillator Period 50 125 ns
T
XHXX
High Time 17 ns
T
XLXX
Low Time 17 ns
T
XLXH
Rise Time 8 ns
T
XHXL
Fall Time 8 ns
EXTERNAL CLOCK DRIVE WAVEFORMS
270942–21
EXTERNAL CRYSTAL CONNECTIONS
270942–41
NOTE:
Keep oscillator components close to chip and use
short, direct traces to XTAL1, XTAL2 and V
SS
. When
using crystals, C1
e
C2
&
20 pF. When using ceramic
resonators, consult manufacturer for recommended cir-
cuitry.
EXTERNAL CLOCK CONNECTIONS
270942–42
NOTE:
*Required if TTL driver used.
Not needed if CMOS driver is used.
AC TESTING INPUT, OUTPUT WAVEFORMS
270942–22
AC Testing inputs are driven at 2.4V for a Logic ‘‘1’’ and 0.45V for
a Logic ‘‘0’’ Timing measurements are made at 2.0V for a Logic
‘‘1’’ and 0.8V for a Logic ‘‘0’’.
FLOAT WAVEFORMS
270942–23
For Timing Purposes a Port Pin is no Longer Floating when a
150 mV change from Load Voltage Occurs and Begins to Float
when a 150 mV change from the Loaded V
OH
/V
OL
Level occurs;
I
OL
/I
OH
e
g
15 mA.
17
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