ATmega16 datasheet(287/315 Pages) ATMEL

287 / 315 page

287

ATmega16(L)

2466E–AVR–10/02

4] The sum of all IOH, for ports B3 - B7, XTAL2, D0 - D2, should not exceed 200 mA.

5] The sum of all IOH, for ports D3 - D7, should not exceed 200 mA.

6] The sum of all IOH, for ports C0 - C7, should not exceed 200 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 144. External Clock Drive Waveforms

External Clock Drive

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 117. External Clock Drive

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

Table 118. External RC Oscillator, Typical Frequencies (V

CC = 5)

R [k

Ω](1)

C [pF]

(2)

100

87 kHz

650 kHz

2.0 MHz

ATMEGA16 Datasheet(PDF) 287 Page - ATMEL Corporation

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