5.3.2 AC Parameters: I²C Interface

Table 5-3. AC Characteristics of I²C InterfaceUnless otherwise indicated, these values are applicable over the specified operating range from T_A = -40℃ to +125℃, V_CC = +1.65V to +5.5V, C_L = 1 TTL Gate and 100 pF.

Parameter	Sym.	Min.	Max.	Units
SCL Clock Frequency	fSCL	0	400	kHz
SCL High Time	tHIGH	600	—	ns
SCL Low Time	tLOW	1200	—	ns
Start Setup Time	tSU.STA	600	—	ns
Start Hold Time	tHD.STA	600	—	ns
Stop Setup Time	tSU.STO	600	—	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	—	300	ns
Clock Low to Data Out Valid	tAA	50	900	ns
Data Out Hold Time	tDH	50	—	ns
Time Bus Must be Free before a New Transmission Can Start(1)	tBUF	1200	—	ns
Glitch Filter(3)	tIGNORE_I2C	50	250	ns

Note:

1. Host system must ensure this timing is met.
2. AC measurement conditions:
   • R_L (connects between SDA and V_CC): 1.2 kΩ (for V_CC = +1.65V to +5.5V)
   • Input pulse voltages: 0.3V_CC to 0.7 V_CC with CMOSenable = 1
   • Input rise and fall times: ≤ 50 ns
   • Input and output timing reference voltage: 0.5 V_CC
3. The glitch filter ensures that all pulses below the min value will be suppressed but may suppress values as great as the max value over all process, voltage and temperature conditions.