Rainbow-electronics ATmega161L Manual de usuario descargar pdf (Pagina 132)

132

ATmega161(L)

1228C–AVR–08/02

If I

exceeds the test condition, V

may exceed the related specification. Pins are not guaranteed to source current

greater than the listed test condition.

5. Minimum V

for power-down is 2V.

External Clock Drive

Waveforms

Figure 82. External Clock

Notes: 1. See “External Data Memory Timing” for a description of how the duty cycle influences

the timing for the external Data memory.

Table 50. External Clock Drive

(1)

Symbol Parameter

=2.7Vto5.5VV

=4.0Vto5.5V

UnitsMin Max Min Max

1/t

CLCL

Oscillator Frequency 0 4 0 8 MHz

CLCL

Clock Period 250 125 ns

CHCX

High Time 100 50 ns

CLCX

Low Time 100 50 ns

CLCH

Rise Time 1.6 0.5 µs

CHCL

Fall Time 1.6 0.5 µs

VIL1

VIH1

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 158 159

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Rainbow-electronics ATmega161L Manual de usuario Pagina 132