87C196 Intel Corporation, 87C196 Datasheet - Page 24

• Manufacturer Part Number: 87C196
• Description: CHMOS 16-BIT MICROCONTROLLER
• Manufacturer: Intel Corporation

87C196CA 87C196CB
EXTERNAL CLOCK DRIVE
EXTERNAL CLOCK DRIVE WAVEFORMS
AC TESTING INPUT OUTPUT WAVEFORMS
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
24
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 logic ‘‘0’’
1 T
T
T
T
T
T
Symbol
XLXL
XHXX
XLXX
XLXH
XHXL
XLXL
Oscillator Frequency
Oscillator Period (T
High Time
Low Time
Rise Time
Fall Time
Parameter
272405 –24
OSC
)
0 35
0 35
FLOAT WAVEFORMS
Conditions
H High
L Low
V Valid
X No Longer
Z Floating
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 loading
V
OH
50 0
Min
Valid
c
c
4
V
T
T
OL
OSC
OSC
level occurs I
Signals
A Address
B BHE
BR BREQ
C CLKOUT
D DATA
G Buswidth
H HOLD
0 65 T
0 65 T
OL
Max
250
I
20
10
10
OH s
OSC
OSC
15 mA
HA HLDA
L ALE ADV
Q Data Out
RD RD
W WR WRH WRI
X XTAL1
Y READY
272405–23
272405 –25
Units
MHz
ns
ns
ns
ns
ns