ATmega16 datasheet(293/357 Pages) ATMEL

293 / 357 page

293

2466S–AVR–05/09

ATmega16(L)

5] The sum of all IOH, for ports D3 - D7, should not exceed 100 mA.

6] The sum of all IOH, for ports C0 - C7, should not exceed 100 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. Minimum VCC for Power-down is 2.5V.

External Clock

Drive Waveforms

Figure 145. External Clock Drive Waveforms

External Clock

Drive

Note:

1. Refer to “External Clock” on page 31 for details.

Notes:

1. R should be in the range 3 k

Ω - 100 kΩ, and C should be at least 20 pF.

2. The frequency will vary with package type and board layout.

VIL1

VIH1

Table 118. External Clock Drive

(1)

Symbol

Parameter

VCC = 2.7V to 5.5VVCC = 4.5V to 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

Table 119. External RC Oscillator, Typical Frequencies (V

CC = 5)

R [k

Ω](1)

C [pF]

f(2)

650 kHz

2.0 MHz

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