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ATSHA204 Datasheet(PDF) 29 Page - ATMEL Corporation

Part # ATSHA204
Description  Atmel CryptoAuthentication
PDF  65 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATSHA204 Datasheet(HTML) 29 Page - ATMEL Corporation

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Atmel ATSHA204 [DATASHEET]
29
8740D
−CRYPTO−3/12
7.3.2
AC Parameters – I
2C Interface
Figure 7-3.
I
2C 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 7-4.
AC Characteristics of I
2C Interface
Applicable over recommended operating range from TA =
−40°C to + 85°C, VCC = +2.0V to +5.5V, CL = 1 TTL gate and 100pF
(unless otherwise noted)
Symbol
Parameter
Min
Max
Units
fSCK
SCK Clock Frequency
0
1
MHz
SCK Clock Duty Cycle
30
70
percent
tHIGH
SCK High Time
400
ns
tLOW
SCK Low Time
400
ns
tSU.STA
Start Setup Time
250
ns
tHD.STA
Start Hold Time
250
ns
tSU.STO
Stop Setup Time
250
ns
tSU.DAT
Data in Setup Time
100
ns
tHD.DAT
Data in Hold Time
0
ns
tR
Input rise time
(1)
300
ns
tF
Input Fall Time
(1)
100
ns
tAA
Clock Low to Data Out Valid
50
550
ns
tDH
Data Out Hold Time
50
ns
tBUF
Time bus must be free before a new transmission can start.
(1)
500
ns
Notes:
1.
Values are based on characterization, but are not tested.
2. AC measurement conditions:
RL (connects between SDA and VCC): 2.0k
Ω (for VCC +2.0V to +5.0V)
Input pulse voltages: 0.3VCC to 0.7VCC
Input rise and fall times:
≤ 50ns
Input and output timing reference voltage: 0.5VCC



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