參數(shù)資料
型號: CY8C27243
廠商: Cypress Semiconductor Corp.
英文描述: PSoC Mixed Signal Array
中文描述: PSoC混合信號陣列
文件頁數(shù): 35/44頁
文件大?。?/td> 542K
代理商: CY8C27243
August 3, 2004
Document No. 38-12012 Rev. *I
35
CY8C27x43 Final Data Sheet
3. Electrical Specifications
3.4.8
AC I
2
C Specifications
The following table lists guaranteed maximum and minimum specifications for the voltage and temperature ranges: 4.75V to 5.25V
and -40
°
C
T
A
85
°
C, or 3.0V to 3.6V and -40
°
C
T
A
85
°
C, respectively. Typical parameters apply to 5V and 3.3V at 25
°
C and
are for design guidance only.
Figure 3-9. Definition for Timing for Fast/Standard Mode on the I
2
C Bus
Table 3-28. AC Characteristics of the I
2
C SDA and SCL Pins
Symbol
F
SCLI2C
T
HDSTAI2C
Description
Standard Mode
Min
Fast Mode
Min
Units
kHz
Notes
Max
Max
SCL Clock Frequency
0
100
0
400
Hold Time (repeated) START Condition. After this period, the
first clock pulse is generated.
LOW Period of the SCL Clock
4.0
0.6
μ
s
T
LOWI2C
T
HIGHI2C
T
SUSTAI2C
T
HDDATI2C
T
SUDATI2C
T
SUSTOI2C
T
BUFI2C
T
SPI2C
4.7
1.3
μ
s
μ
s
μ
s
μ
s
ns
HIGH Period of the SCL Clock
4.0
0.6
Set-up Time for a Repeated START Condition
4.7
0.6
Data Hold Time
0
0
Data Set-up Time
250
100
a
0.6
a. A Fast-Mode I2C-bus device can be used in a Standard-Mode I2C-bus system but the requirement t
SU;DAT
250 ns must then be met. This will automatically be the case if
the device does not stretch the LOW period of the SCL signal. If such device does stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line
t
rmax
+ t
SU;DAT
= 1000 + 250 = 1250 ns (according to the Standard-Mode I2C-bus specification) before the SCL line is released.
Set-up Time for STOP Condition
4.0
μ
s
μ
s
ns
Bus Free Time Between a STOP and START Condition
4.7
1.3
Pulse Width of spikes are suppressed by the input filter.
0
50
SDA
SCL
S
Sr
S
P
T
BUFI2C
T
SPI2C
T
HDSTAI2C
T
SUSTOI2C
T
SUSTAI2C
T
LOWI2C
T
HIGHI2C
T
HDDATI2C
T
HDSTAI2C
T
SUDATI2C
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