Datasheet

Symbol Parameter Condition Min Typ Max Units
t
BG
Bandgap reference start-up time 40 70 μs
I
BG
Bandgap reference current consumption 10 μs
Note:
1. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling).
2. V
BOT
may be below nominal minimum operating voltage for some devices. For devices where this
is the case, the device is tested down to V
CC
= V
BOT
during the production test. This guarantees
that a Brown-out Reset will occur before V
CC
drops to a voltage where correct operation of the
microcontroller is no longer guaranteed. The test is performed using BODLEVEL = 1 and
BODLEVEL = 0 for ATmega8A.
30.5 Two-wire Serial Interface Characteristics
The table below describes the requirements for devices connected to the Two-wire Serial Bus. The
ATmega8A Two-wire Serial Interface meets or exceeds these requirements under the noted conditions.
Timing symbols refer to Figure 30-3.
Table 30-6. Two-wire Serial Bus Requirements
Symbol Parameter Condition Min Max Units
V
IL
Input Low-voltage -0.5 0.3V
CC
V
V
IH
Input High-voltage 0.7V
CC
V
CC
+ 0.5 V
V
hys
(1)
Hysteresis of Schmitt Trigger
Inputs
0.05V
CC
(2)
– V
V
OL
(1)
Output Low-voltage 3mA sink current 0 0.4 V
t
r
(1)
Rise Time for both SDA and
SCL
20 + 0.1C
b
(3)(2)
300 ns
t
of
(1)
Output Fall Time from V
IHmin
to
V
ILmax
10pF < C
b
< 400pF
(3)
20 + 0.1C
b
(3)(2)
250 ns
t
SP
(1)
Spikes Suppressed by Input
Filter
0 50
(2)
ns
I
i
Input Current each I/O Pin 0.1V
CC
< V
i
< 0.9V
CC
-10 10 μA
C
i
(1)
Capacitance for each I/O Pin – 10 pF
f
SCL
SCL Clock Frequency f
CK
(4)
> max(16f
SCL
,
250kHz)
(5)
0 400 kHz
Rp Value of Pull-up resistor f
SCL
≤ 100kHz

CC
 0.4V
3mA
1000ns



f
SCL
> 100kHz

CC
 0.4V
3mA
300ns



AVR 8-Bit Microcontroller
Electrical Characteristics – TA = -40°C to 8...
© 2017 Microchip Technology Inc.
Datasheet Complete
40001974A-page 311