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AT80C31X2-RLTUM

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42
37
4428E–8051–02/08
AT/TS80C31X2
Table 14-13. AC Parameters for a Variable Clock: derating formula
14.5.5 Shift Register Timing Waveforms
Figure 14-9. Shift Register Timing Waveforms
Table 14-14. External Clock Drive Characteristics (XTAL1)
Symbol Type
Standard
Clock X2 Clock -M -V -L Units
T
XLXL
Min 12 T 6 T ns
T
QVHX
Min 10 T - x 5 T - x 50 50 50 ns
T
XHQX
Min 2 T - x T - x 20 20 20 ns
T
XHDX
Min x x 0 0 0 ns
T
XHDV
Max 10 T - x 5 T- x 133 133 133 ns
Symbol Parameter Min Max Units
T
CLCL
Oscillator Period 25 ns
T
CHCX
High Time 5 ns
T
CLCX
Low Time 5 ns
T
CLCH
Rise Time 5 ns
T
CHCL
Fall Time 5 ns
T
CHCX
/T
CLCX
Cyclic ratio in X2 mode 40 60 %
38
4428E–8051–02/08
AT/TS80C31X2
14.5.6 External Clock Drive Waveforms
Figure 14-10. External Clock Drive Waveforms
14.5.7 AC Testing Input/Output Waveforms
Figure 14-11. AC Testing Input/Output Waveforms
AC inputs during testing are driven at V
CC
- 0.5 for a logic “1” and 0.45V for a logic “0”. Timing
measurement are made at V
IH
min for a logic “1” and V
IL
max for a logic “0”.
14.5.8 Float Waveforms
Figure 14-12. Float Waveforms
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 V
OH
/V
OL
level occurs. I
OL
/I
OH
≥ ± 20mA.
14.5.9 Clock Waveforms
Valid in normal clock mode. In X2 mode XTAL2 signal must be changed to XTAL2 divided by
two.
V
CC
-0.5
V
0.45
V
0.7V
CC
0.2V
CC
-0.1
V
T
CHCL
T
CLCX
T
CLCL
T
CLCH
T
CHCX
39
4428E–8051–02/08
AT/TS80C31X2
Figure 14-13. Clock Waveforms
This diagram indicates when signals are clocked internally. The time it takes the signals to prop-
agate to the pins, however, ranges from 25 to 125 ns. This propagation delay is dependent on
variables such as temperature and pin loading. Propagation also varies from output to output
and component. Typically though (T
A
=25°C fully loaded) RD and WR propagation delays are
approximately 50ns. The other signals are typically 85 ns. Propagation delays are incorporated
in the AC specifications.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42

AT80C31X2-RLTUM

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IC MCU 8BIT ROMLESS 44VQFP
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