ATMEGA8L ATMEL [ATMEL Corporation], ATMEGA8L Datasheet - Page 240

• Manufacturer Part Number: ATMEGA8L
• Description: 8-bit AVR with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Two-wire Serial Interface Characteristics
Table 101 describes the requirements for devices connected to the Two-wire Serial Bus. The ATmega8 Two-wire Serial
Interface meets or exceeds these requirements under the noted conditions.
Timing symbols refer to Figure 115.
Table 101. Two-wire Serial Bus Requirements
Notes:
240
Symbol
V
V
V
V
t
t
t
I
C
f
Rp
t
t
t
t
t
t
t
t
r
of
SP
i
SCL
HD;STA
LOW
HIGH
SU;STA
HD;DAT
SU;DAT
SU;STO
BUF
(1)
IL
IH
hys
OL
i
(1)
(1)
(1)
(1)
(1)
2. Required only for f
3. C
4. f
1. In ATmega8, this parameter is characterized and not 100% tested.
ATmega8(L)
Parameter
Input Low-voltage
Input High-voltage
Hysteresis of Schmitt Trigger Inputs
Output Low-voltage
Rise Time for both SDA and SCL
Output Fall Time from V
Spikes Suppressed by Input Filter
Input Current each I/O Pin
Capacitance for each I/O Pin
SCL Clock Frequency
Value of Pull-up resistor
Hold Time (repeated) START Condition
Low Period of the SCL Clock
High period of the SCL clock
Set-up time for a repeated START condition
Data hold time
Data setup time
Setup time for STOP condition
Bus free time between a STOP and START
condition
CK
b
= capacitance of one bus line in pF.
= CPU clock frequency
SCL
> 100 kHz.
IHmin
to V
ILmax
f
CK
(4)
10 pF < C
0.1V
> max(16f
3 mA sink current
f
f
SCL
SCL
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
CC
Condition
> 100 kHz
> 100 kHz
> 100 kHz
> 100 kHz
> 100 kHz
> 100 kHz
> 100 kHz
> 100 kHz
> 100 kHz
< V
100 kHz
b
100 kHz
100 kHz
100 kHz
100 kHz
100 kHz
100 kHz
100 kHz
100 kHz
< 400 pF
SCL
i
< 0.9V
, 250kHz)
(6)
(7)
CC
(3)
(5)
20 + 0.1C
20 + 0.1C
V
----------------------------
V
----------------------------
0.05 V
CC
CC
0.7 V
3mA
3mA
-0.5
250
100
Min
-10
4.0
0.6
4.7
1.3
4.0
0.6
4.7
0.6
4.0
0.6
4.7
1.3
–
–
0
0
–
0
0
0
0,4V
0,4V
CC
CC
b
b
(2)
(3)(2)
(3)(2)
V
1000ns
------------------ -
0.3 V
CC
300ns
--------------- -
50
3.45
Max
300
250
400
0.4
C
0.9
10
10
C
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
+ 0.5
b
(2)
b
2486M–AVR–12/03
CC
Units
kHz
µA
pF
ns
ns
ns
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
ns
ns
µs
µs
µs
µs
V
V
V
V