4.4 AC Characteristics

Table 4-3. AC Characteristics⁽¹⁾
Parameter	Symbol	Fast Mode		Fast Mode Plus		Units
		V_cc = 1.7V to 2.5V		Vcc = 2.5V to 5.5V
		Min.	Max.	Min.	Max.
Clock Frequency, SCL	f_SCL	—	400	—	1000	kHz
Clock Pulse Width Low	t_LOW	1200	—	500	—	ns
Clock Pulse Width High	t_HIGH	600	—	400	—	ns
Input Filter Spike Suppression	t_I	—	100	—	50	ns
Clock Low to Data Out Valid	t_AA	100	900	50	450	ns
Bus Free Time between Stop and Start	t_BUF	1300	—	500	—	ns
Start Hold Time	t_HD.STA	600	—	250	—	ns
Start Set‑Up Time	t_SU.STA	600	—	250	—	ns
Data In Hold Time	t_HD.DAT	0	—	0	—	ns
Data In Set‑Up Time	t_SU.DAT	100	—	100	—	ns
Inputs Rise Time⁽²⁾	t_R	—	300	—	300	ns
Inputs Fall Time⁽²⁾	t_F	—	300	—	100	ns
Stop Set-Up Time	t_SU.STO	600	—	250	—	ns
Data Out Hold Time	t_DH	50	—	50	—	ns
Write Cycle Time	t_WR	—	5	—	5	ms

Note:

AC measurement conditions:
- C_L: 100 pF
- R_PUP (SDA bus line pull-up resistor to V_CC): 1.3 kΩ (1000 kHz), 4 kΩ (400 kHz), 10 kΩ (100 kHz)
- Input rise and fall times: ≤ 50 ns
- Input and output timing reference voltages: 0.5 x V_CC
This parameter is characterized but is not 100% tested in production.

Figure 4-1. Bus Timing