8XC196MC Datasheet, PDF (15/22 Pages) Intel Corporation – INDUSTRIAL MOTOR CONTROL MICROCONTROLLER

EXTERNAL CLOCK DRIVE
Symbol
Parameter
1 T_XLXL
T_XLXL
T_XHXX
T_XLXX
T_XLXH
T_XHXL
Oscillator Frequency
Oscillator Period
High Time
Low Time
Rise Time
Fall Time
EXTERNAL CRYSTAL CONNECTIONS
8XC196MC
Min
Max
Units
8
16 0
MHz
62 5
125
ns
22
ns
22
ns
10
ns
10
ns
EXTERNAL CLOCK CONNECTIONS
270946 – 14
NOTE
Keep oscillator components close to chip and use
short direct traces to XTAL1 XTAL2 and V_SS When
using crystals C1 e 20 pF C2 e 20 pF When using
ceramic resonators consult manufacturer for recom-
mended circuitry
EXTERNAL CLOCK DRIVE WAVEFORMS
Required if TTL driver used
Not needed if CMOS driver is used
270946 – 15
270946 – 8
An external oscillator may encounter as much as a 100 pF load at XTAL1 when it starts-up This is due to
interaction between the amplifier and its feedback capacitance Once the external signal meets the V_IL and
V_IH specifications the capacitance will not exceed 20 pF
AC TESTING INPUT OUTPUT WAVEFORMS
FLOAT WAVEFORMS
270946 – 9
AC Testing inputs are driven at 3 5V 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’’
270946 – 10
For Timing Purposes a Port Pin is no Longer Floating when a
100 mV change from Load Voltage Occurs and Begins to Float
when a 100 mV change from the Loaded V_OH V_OL Level occurs
I_OL I_OH e s g15 mA
15