12. Dynamic characteristics

Table 19.

I2C-bus interface dynamic characteristics[1]

VCC = 2.8 V to 5.5 V; Tamb = 55 C to +125 C; unless otherwise specified.

 

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fSCL

SCL clock frequency

see Figure 20

0.02

-

400

kHz

tHIGH

HIGH period of the SCL clock

 

0.6

-

-

s

tLOW

LOW period of the SCL clock

 

1.3

-

-

s

tHD;STA

hold time (repeated) START condition  

100

-

-

ns

tSU;DAT

data set-up time

 

100

-

-

ns

tHD;DAT

data hold time

 

0

-

-

ns

tSU;STO

set-up time for STOP condition

 

100

-

-

ns

tf

fall time

SDA and OS outputs;

CL = 400 pF; IOL =3 mA

-

250

-

ns

tto

time-out time

[2][3] 75

-

200

ms

 

[1]

These specifications are guaranteed by design and not tested in production.

[2]

This is the SDA time LOW for reset of serial interface.

[3]

Holding the SDA line LOW for a time greater than tto will cause the LM75B to reset SDA to the idle state of the serial bus communication

(SDA set HIGH).

 

 

 

 

 

SDA

 

tf

 

 

SCL

 

 

tLOW

tr

 

 

tSU;DAT

tf

 

 

 

tHD;STA

tSP

tr

 

 

tBUF

0.7 × VDD

0.3 × VDD

 

 

 

0.7 × VDD

0.3 × VDD

tHD;STA

tHIGH

tSU;STA

tSU;STO

S

tHD;DAT

Sr

P

S

 

002aab271

 

Fig 20. Timing diagram

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LM75B