8XC196KB/8XC196KB16
EXTERNAL CLOCK DRIVE
Symbol
Parameter
Min
Max
12.0
Units
MHz
1/T
1/T
Oscillator Frequency 12 MHz
Oscillator Frequency 16 MHz
Oscillator Period 12 MHz
Oscillator Period 16 MHz
High Time
3.5
3.5
XLXL
XLXL
16
MHz
ns
T
T
T
T
T
T
83.3
62.5
286
286
XLXL
ns
XLXL
XHXX
XLXX
XLXH
XHXL
21.25
21.25
ns
Low Time
ns
Rise Time
10
10
ns
Fall Time
ns
EXTERNAL CLOCK DRIVE WAVEFORMS
270909±10
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 and
IL
V
IH
specifications, the capacitance will not exceed 20 pF.
EXTERNAL CRYSTAL CONNECTIONS
EXTERNAL CLOCK CONNECTIONS
270909±11
NOTE:
270909±12
Keep oscillator components close to chip and use
short, direct traces to XTAL1, XTAL2 and V . When
* Required if open-collector TTL driver used
Not needed if CMOS driver is used.
SS
e
e
20 pF. When using
using crystals, C1
20 pF, C2
ceramic resonators, consult manufacturer for recom-
mended circuitry.
AC TESTING INPUT, OUTPUT WAVEFORMS
FLOAT WAVEFORMS
270909±13
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''.
270909±14
For Timing Purposes a Port Pin is no Longer Floating when a
200 mV change from Load Voltage Occurs and Begins to Float
when a 200 mV change from the Loaded V /V
Level occurs;
OH OL
e
g
15 mA.
I
/I
OL OH
15
INTEL [ INTEL ]
