24512 데이터 시트보기 (PDF) - STMicroelectronics

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24512

512-Kbit serial I²C bus EEPROM

STMicroelectronics 

Signal description

M24512-R, M24512-W, M24512-DR

Figure 4. I2C Fast mode (fC = 400 kHz): maximum Rbus value versus

bus parasitic capacitance (Cbus)

100

10

4 kΩ

Here Rbus

Rbus

× Cbus = 120 ns

× Cbus

= 400 ns

1

10

30 pF

100

Bus line capacitor (pF)

When tLOW = 1.3 µs (min value for

fC = 400 kHz), the Rbus × Cbus

time constant must be below the

400 ns time constant line

represented on the left.

VCC

Rbus

1000

I²C bus

master

SCL

SDA

M24xxx

Cbus

ai14796b

Figure 5. I2C Fast mode Plus (fC = 1 MHz): maximum Rbus value versus

bus parasitic capacitance (Cbus)

100

Rbus × Cbus = 270 ns

10

5

Rbus × Cbus = 100 ns

Here,

Rbus × Cbus = 150 ns

1

10

30

Bus line capacitor (pF)

When tLOW = 700 ns

(max possible value for

fC = 1 MHz), the Rbus × Cbus

time constant must be below

the 270 ns time constant line

represented on the left.

When tLOW = 400 ns

(min value for fC = 1 MHz),

the Rbus × Cbus time constant

must be below the 100 ns

time constant line represented

on the left.

100

VCC

Rbus

I²C bus SCL

master

SDA

M24xxx

Cbus

ai14795d

10/39

Doc ID 16459 Rev 19

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