ATmega16A datasheet(296/352 Pages) ATMEL

296 / 352 page

296

8154B–AVR–07/09

ATmega16A

Note:

1. Refer to “External Clock” on page 30 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.

27.5

System and Reset Characteristics

Notes:

1. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling).

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 27-1.

External RC Oscillator, Typical Frequencies (V

CC = 5)

R [k

Ω](1)

C [pF]

f(2)

650 kHz

2.0 MHz

Figure 27-3. External Clock Drive

(1) (Continued)

Symbol

Parameter

VCC = 2.7V to 5.5VVCC = 4.5V to 5.5V

Units

Min

Max

Min

Max

Table 27-2.

Reset, Brown-out and Internal Voltage ReferenceCharacteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

VPOT

Power-on Reset Threshold

Voltage (rising)

1.4

2.3

Power-on Reset Threshold

Voltage (falling)(1)

1.3

2.3

VRST

RESET Pin Threshold

Voltage

0.1 V

0.9V

tRST

Minimum pulse width on

RESET Pin

1.5

µs

VBOT

Brown-out Reset Threshold

Voltage(2)

BODLEVEL = 1

2.5

2.7

3.2

BODLEVEL = 0

3.6

4.0

4.5

tBOD

Minimum low voltage period

for Brown-out Detection

BODLEVEL = 1

µs

BODLEVEL = 0

µs

VHYST

Brown-out Detector

hysteresis

VBG

Bandgap reference voltage

1.15

1.23

1.4

tBG

Bandgap reference start-up

time

µs

IBG

Bandgap reference current

consumption

µA

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