4.4 AC Characteristics

Table 4-3. AC Characteristics⁽¹⁾
Parameter	Symbol	V_CC < 2.2V		V_CC ≥ 2.2V				Units
		100 kHz		400 kHz		1 MHz
		Min.	Max.	Min.	Max.	Min.	Max.
Clock Frequency, SCL	f_SCL	10⁽²⁾	100	10⁽²⁾	400	10⁽²⁾	1,000	kHz
Clock Pulse Width Low	t_LOW	4,700	—	1,300	—	500	—	ns
Clock Pulse Width High	t_HIGH	4,000	—	600	—	250	—	ns
Noise Suppression Time	t_I	—	50	—	50	—	50	ns
Bus Free Time between Stop and Start⁽³⁾	t_BUF	4,700	—	1,300	—	500	—	ns
Start Hold Time	t_HD.STA	4,000	—	600	—	260	—	ns
Start Set-Up Time	t_SU.STA	4,700	—	600	—	260	—	ns
Data In Hold Time	t_HD.DAT	0	—	0	—	0	—	ns
Data In Set-up Time	t_SU.DAT	250	—	100	—	50	—	ns
Inputs Rise Time⁽³⁾	t_R	—	1,000	20	300	—	120	ns
Inputs Fall Time⁽³⁾	t_F	—	300	20	300	—	120	ns
Stop Set-Up Time	t_SU.STO	4,000	—	600	—	260	—	ns
Data Out Hold Time	t_DH.DAT	200	3,450	200	900	0	350	ns
Write Cycle Time	t_WR	—	5	—	5	—	5	ms
Timeout Time	t_OUT	25	35	25	35	25	35	ms

Note:

AC measurement conditions:
- C_L: 100 μF
- 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 pulse voltages: 0.3 x V_CC to 0.7 x V_CC
- Input rise and fall times: ≤50 ns
- Input and output timing reference voltages: 0.5 x V_CC
The minimum frequency is specified at 10 kHz to avoid activating the timeout feature.
These parameters are determined through product characterization and are not 100% tested in production.

Figure 4-1. Bus Timing

AT34C04