TS87C54X2-LCA Ver la hoja de datos (PDF) - Atmel Corporation
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TS87C54X2-LCA Datasheet PDF : 58 Pages
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10.5.11 External Clock Drive Characteristics (XTAL1)
Table 38. AC Parameters
Symbol
Parameter
Min
TCLCL
Oscillator Period
25
TCHCX
High Time
5
TCLCX
Low Time
5
TCLCH
Rise Time
TCHCL
Fall Time
TCHCX/TCLCX Cyclic ratio in X2 mode
40
10.5.12 External Clock Drive Waveforms
TS80C54X2/C58X2
TS87C54X2/C58X2
Max
5
5
60
Units
ns
ns
ns
ns
ns
%
VCC-0.5 V
0.45 V
0.7VCC
0.2VCC-0.1 V
TCHCL
TCLCX
TCHCX
TCLCH
TCLCL
Figure 23. External Clock Drive Waveforms
10.5.13 AC Testing Input/Output Waveforms
INPUT/OUTPUT
VCC-0.5 V
0.45 V
0.2VCC+0.9
0.2VCC-0.1
Figure 24. AC Testing Input/Output Waveforms
AC inputs during testing are driven at VCC - 0.5 for a logic “1” and 0.45V for a logic “0”. Timing measurement
are made at VIH min for a logic “1” and VIL max for a logic “0”.
10.5.14 Float Waveforms
FLOAT
VOH-0.1 V VLOAD
VOL+0.1 V
VLOAD+0.1 V
VLOAD-0.1 V
Figure 25. Float Waveforms
Rev. C - 15 January, 2001
55
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