Datasheet

30.3.2 External Clock Drive
Table 30-3. External Clock Drive
Symbol Parameter V
CC
= 2.7V to 5.5V V
CC
= 4.5V to 5.5V Units
Min Max Min Max
1/t
CLCL
Oscillator Frequency 0 8 0 16 MHz
t
CLCL
Clock Period 125 62.5 ns
t
CHCX
High Time 50 25 ns
t
CLCX
Low Time 50 25 ns
t
CLCH
Rise Time 1.6 0.5 μs
t
CHCL
Fall Time 1.6 0.5 μs
Δt
CLCL
Change in period from one clock
cycle to the next
2 2 %
Table 30-4. External RC Oscillator, Typical Frequencies
R [kΩ]
(1)
C [pF] f
(2)
33 22 650kHz
10 22 2.0MHz
Note:
1. R should be in the range 3kΩ - 100kΩ, and C should be at least 20pF. The C values given in the
table includes pin capacitance. This will vary with package type.
2. The frequency will vary with package type and board layout.
30.4 System and Reset Characteristics
Table 30-5. Reset, Brown-out and Internal Voltage Reference Characteristics
Symbol Parameter Condition Min Typ Max Units
V
POT
Power-on Reset Threshold Voltage (rising)
(1)
1.4 2.3 V
Power-on Reset Threshold Voltage (falling) 1.3 2.3 V
V
RST
RESET Pin Threshold Voltage 0.2 0.9 V
CC
t
RST
Minimum pulse width on RESET Pin 1.5 μs
V
BOT
Brown-out Reset Threshold Voltage
(2)
BODLEVEL = 1 2.40 2.60 2.90 V
BODLEVEL = 0 3.70 4.00 4.50
t
BOD
Minimum low voltage period for Brown-out Detection BODLEVEL = 1 2 μs
BODLEVEL = 0 2 μs
V
HYST
Brown-out Detector hysteresis 130 mV
V
BG
Bandgap reference voltage 1.15 1.23 1.35 V
AVR 8-Bit Microcontroller
Electrical Characteristics – TA = -40°C to 8...
© 2017 Microchip Technology Inc.
Datasheet Complete
40001974A-page 310