Cypress CY8C22113 manual AC I2C Specifications, 25. AC Characteristics of the I2C SDA and SCL Pins

CY8C22x13 Final Data Sheet 3. Electrical Specifications

3.4.8AC I2C Specifications

The following table lists guaranteed maximum and minimum specifications for the voltage and temperature ranges: 4.75V to 5.25V and -40°C ≤ TA ≤ 85°C, or 3.0V to 3.6V and -40°C ≤ TA ≤ 85°C, respectively. Typical parameters apply to 5V and 3.3V at 25°C and are for design guidance only or unless otherwise specified.

Table 3-25. AC Characteristics of the I2C SDA and SCL Pins

			Standard Mode		Fast Mode
	Symbol	Description	Min	Max	Min	Max	Units	Notes
FSCLI2C		SCL Clock Frequency	0	100	0	400	kHz
THDSTAI2C		Hold Time (repeated) START Condition. After this	4.0	–	0.6	–	∝s
		period, the first clock pulse is generated.
TLOWI2C		LOW Period of the SCL Clock	4.7	–	1.3	–	∝s
THIGHI2C		HIGH Period of the SCL Clock	4.0	–	0.6	–	∝s
TSUSTAI2C		Set-up Time for a Repeated START Condition	4.7	–	0.6	–	∝s
THDDATI2C		Data Hold Time	0	–	0	–	∝s
TSUDATI2C		Data Set-up Time	250	–	100a	–	ns
TSUSTOI2C		Set-up Time for STOP Condition	4.0	–	0.6	–	∝s
TBUFI2C		Bus Free Time Between a STOP and START Condition	4.7	–	1.3	–	∝s
TSPI2C		Pulse Width of spikes are suppressed by the input fil-	–	–	0	50	ns
		ter.

a.A Fast-Mode I2C-bus device can be used in a Standard-Mode I2C-bus system, but the requirement tSU;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 trmax + tSU;DAT = 1000 + 250 = 1250 ns (according to the Standard-Mode I2C-bus specification) before the SCL line is released.

SDA	TLOWI2C
		TSUDATI2C
SCL
S	THDSTAI2C THDDATI2C	THIGHI2C	TSUSTAI2C

THDSTAI2C

Sr

TSPI2C

TSUSTOI2C

TBUFI2C

P S

Figure 3-8. Definition for Timing for Fast/Standard Mode on the I2C Bus

June 3, 2004 Document No. 38-12009 Rev. *E 30

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