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8.3.2
AC Parameters: I2C Interface
Figure 8-3. I2C Synchronous Data Timing
SCL
SDA IN
SDA OUT
t
F
t
HIGH
t
LOW
t
LOW
t
R
t
AA
t
DH
t
BUF
t
SU.STO
t
SU.DAT
t
HD.DAT
t
HD.STA
t
SU.STA
Table 8-4. AC Characteristics of I2C Interface
Unless otherwise specified, applicable over recommended operating range from TA = -40°C to + 85°C, VCC = +2.0V
to +5.5V,
CL = 1 TTL Gate and 100 pF.
Parameter
Symbol
Min
Max
Units
SCK Clock Frequency
fSCK
0
1
MHz
SCK High Time
tHIGH
400
ns
SCK Low Time
tLOW
400
ns
Start Setup Time
tSU.STA
250
ns
Start Hold Time
tHD.STA
250
ns
Stop Setup Time
tSU.STO
250
ns
Data In Setup Time
tSU.DAT
100
ns
Data In Hold Time
tHD.DAT
0
ns
Input Rise Time(1)
tR
300
ns
Input Fall Time(1)
tF
100
ns
Clock Low to Data Out Valid
tAA
50
550
ns
Data Out Hold Time
tDH
50
ns
SMBus Timeout Delay
tTIMEOUT
25
75
ms
Time bus must be free before a new transmission can start. (1)
tBUF
500
ns
Note: 
1.
Values are based on characterization and are not tested
2.
AC measurement conditions:
–
RL (connects between SDA and VCC): 1.2 kΩ (for VCC +2.0V to +5.0V)
–
Input pulse voltages: 0.3 VCC to 0.7 VCC
–
Input rise and fall times: ≤ 50 ns
–
Input and output timing reference voltage: 0.5VCC
ATECC508A
Electrical Characteristics
© 2017 Microchip Technology Inc.
Datasheet Complete
DS20005927A-page 52



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