3.3.2 AC Parameters: I2C Interface

Figure 3-4. I2C Synchronous Data Timing
Table 3-4. AC Characteristics of I2C Interface(2)Unless otherwise specified, applicable over recommended operating range from TA = -40°C to +100°C, VCC = +2.0V to +5.5V, CL = 1 TTL Gate and 100 pF.
Parameter Sym. Min. Max. Units
SCL Clock Frequency fSCL 0 1 MHz
SCL High Time tHIGH 400 ns
SCL Low Time tLOW 400 ns
Start Setup Time tSU.STA 250 ns
Start Hold Time tHD.STA 250 ns
Stop Setup Time tSU.STO 250 ns
Data In Setup Time tSU.DAT 100 ns
Data In Hold Time tHD.DAT 0 ns
Input Rise Time1 tR 300 ns
Input Fall Time1 tF 100 ns
Clock Low to Data Out Valid tAA 50 550 ns
Data Out Hold Time tDH 50 ns
SMBus Time-Out Delay tTIMEOUT 25 35 ms
Time bus must be free before a new transmission can start1 tBUF 500 ns
Note:
  1. Values are based on characterization and are not tested.
  2. AC measurement conditions:
    • RL (connects between SDA and VCC): 1.2 kΩ (for VCC = +2.0V to +5.0V)
    • Input pulse voltages: 0.3VCC to 0.7VCC
    • Input rise and fall times: ≤ 50 ns
    • Input and output timing reference voltage: 0.5VCC