4.4 AC Characteristics

Table 4-3. AC Characteristics(1)
ParameterSymbolFast ModeFast Mode PlusUnits
VCC = 1.7V to 2.5VVCC = 2.5V to 5.5V
Min.Max.Min.Max.
Clock Frequency, SCLfSCL4001000kHz
Clock Pulse Width LowtLOW1300500ns
Clock Pulse Width HightHIGH600400ns
Noise Suppression Time(2)tI5050ns
Clock Low to Data Out ValidtAA5090050450ns
Bus Free Time between Stop and Start(2)tBUF1300500ns
Start Hold TimetHD.STA600250ns
Start Set‑up TimetSU.STA600250ns
Data In Hold TimetHD.DAT00ns
Data In Set‑up TimetSU.DAT100100ns
Inputs Rise Time(2)tR300300ns
Inputs Fall Time(2)tF300100ns
Stop Set-up TimetSU.STO600250ns
Data Out Hold TimetDH5050ns
Write Cycle TimetWR55ms
Note:
  1. AC measurement conditions:
    • CL = 100 pF
    • RPUP (SDA bus line pull-up resistor to VCC): 1.3 kΩ (1000 kHz), 4 kΩ (400 kHz), 10 kΩ (100 kHz)
    • Input pulse voltages: 0.3 VCC to 0.7 VCC
    • Input rise and fall times: ≤ 50 ns
    • Input and output timing reference voltages: 0.5 x VCC
  2. This parameter is ensured by characterization and is not 100% tested.
Figure 4-1. Bus Timing