T80C251TB Ver la hoja de datos (PDF) - Intel
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T80C251TB Datasheet PDF : 36 Pages
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8xC251TB/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
6.5 External Clock Drive
Symbol
1/TCLCL
TCHCX
TCLCX
TCLCH
TCHCL
Table 15. External Clock Drive
Parameter
Min
Oscillator Frequency (FOSC)
High Time
20
Low Time
20
Rise Time
Fall Time
Max
Units
24
MHz
ns
ns
10
ns
10
ns
VCC – 0.5
0.7 VCC
0.45 V
0.2 VCC – 0.1
TCHCL
TCLCH
TCHCX
TCLCX
TCLCL
Figure 16. External Clock Drive Waveforms
VCC – 0.5
0.45 V
Inputs
0.2 VCC + 0.9
0.2 VCC – 0.1
Outputs
VIH MIN
VOL MAX
AC inputs during testing are driven at VCC – 0.5V for a logic 1
and 0.45 V for a logic 0. Timing measurements are made at
a min of VIH for a logic 1 and VOL for a logic 0.
Figure 17. AC Testing Input, Output Waveforms
A4119-01
A4118-01
29
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