AN87C196KC Ver la hoja de datos (PDF) - Intel
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AN87C196KC Datasheet PDF : 21 Pages
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AUTOMOTIVE 87C196KC
EXTERNAL CLOCK DRIVE
Symbol
Parameter
Min
Max
Units
1 TXLXL
TXLXL
TXHXX
TXLXX
TXLXH
TXHXL
Oscillator Frequency
Oscillator Frequency
High Time
Low Time
Rise Time
Fall Time
40
62 5
22
22
16 0
250
10
10
MHz
ns
ns
ns
ns
ns
EXTERNAL CLOCK DRIVE WAVEFORMS
270846 – 26
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 VIL and
VIH specifications the capacitance will not exceed 20 pF
AC TESTING INPUT OUTPUT WAVEFORMS
FLOAT WAVEFORMS
270846 – 27
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’’
270846 – 28
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 VOH VOL Level occurs
IOL IOH e g15 mA
EXPLANATION OF AC SYMBOLS
Each symbol is two pairs of letters prefixed by ‘‘T’’ for time The characters in a pair indicate a signal and its
condition respectively Symbols represent the time between the two signal condition points
Conditions
H High
L Low
V Valid
X No Longer Valid
Z Floating
Signals
A Address
B BHE
C CLKOUT
D DATA
G Buswidth
H HOLD
HA HLDA
L ALE ADV
BR BREQ
R RD
W WR WRH WRL
X XTAL1
Y READY
Q Data Out
14
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