Figure 11. Maximum Rbus vs. bus parasitic capacitance (Cbus) for an I2C bus at maximum frequency fC =

400 kHz

1

10

100

10

100

1000

Bus line capacitor (pF)

I²C bus

master

M24xxx

Rbus

VCC

Cbus

SCL

SDA

R

bu

s ×

C

bu

s = 400

ns

Here Rbus x Cbus = 120 ns

4 k

30

The Rbus x Cbus time constant

must be below the 400 ns

time constant line represented

on the left.

Figure 12. AC waveforms

SCL

SDA Out

SCL

SDA In

Data valid

tCLQV

tCLQX

tCHDH

Stop

condition

tCHDL

Start

condition

Write cycle

tW

Data valid

tQL1QL2

SDA In

tCHDL

Start

condition

tDXCH

tCLDX

SDA

Input

SDA

Change

tCHDH

tDHDL

Stop

condition

Start

condition

tXH1XH2

SCL

tCHCL

tDLCL

tCLCH

tXH1XH2

tXL1XL2

tXL1XL2

tCHCL

M24C16-W M24C16-R M24C16-F

DC and AC parameters

DS9194 - Rev 11

page 23/40