AT90USB82 datasheet(264/306 Pages) ATMEL

264 / 306 page

264

7707D–AVR–07/08

AT90USB82/162

If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater

than the listed test condition.

4. Although each I/O port can source more than the test conditions (20mA at VCC = 5V, 10mA at VCC = 3V) under steady

state conditions (non-transient), the following must be observed:

1.)The sum of all IOL, for ports B0-B7, C0-C7, D0-D7 should not exceed 150 mA.

If IOH exceeds the test condition, VOH may exceed the related specification. Pins are not guaranteed to source current

greater than the listed test condition.

5. All DC Characteristics contained in this datasheet are based on simulation and characterization of other AVR microcontrol-

lers manufactured in the same process technology. These values are preliminary values representing design targets, and

will be updated after characterization of actual silicon

6. Values with “Power Reduction Register 1 - PRR1” disabled (0x00).

7. As specified in the USB Electrical chapter, the D+/D- pads can withstand voltages down to -1V applied through a 39

Ω resis-

tor (in series with the external 22

Ω resistor).

8. All IOs Except XTAL1, MOSI, MISO, PS2 and Reset pins

26.3

External Clock Drive Waveforms

Figure 26-1. External Clock Drive Waveforms

26.4

External Clock Drive

Note:

All DC Characteristics contained in this datasheet are based on simulation and characterization of

other AVR microcontrollers manufactured in the same process technology. These values are pre-

liminary values representing design targets, and will be updated after characterization of actual

silicon.

VIL1

VIH1

Table 26-1.

External Clock Drive

Symbol

Parameter

VCC=2.7-5.5V

VCC=4.5-5.5V

Units

Min.

Max.

Min.

Max.

1/tCLCL

Oscillator

Frequency

MHz

tCLCL

Clock Period

125

62.5

tCHCX

High Time

tCLCX

Low Time

tCLCH

Rise Time

1.6

0.5

μs

tCHCL

Fall Time

1.6

0.5

μs

Δt

CLCL

Change in period

from one clock

cycle to the next

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