LM82 datasheet(6/25 Pages) TI

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LM82

SNIS113D – JANUARY 2000 – REVISED MARCH 2013

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Logic Electrical Characteristics-

SMBus DIGITAL SWITCHING CHARACTERISTICS

Unless otherwise noted, these specifications apply for VCC=+3.0 Vdc to +3.6 Vdc, CL (load capacitance) on output lines =

80 pF. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = +25°C, unless otherwise noted.

The switching characteristics of the LM82 fully meet or exceed the published specifications of the SMBus or I

2C bus. The

following parameters are the timing relationships between SMBCLK and SMBData signals related to the LM82. They are not

the I

2C or SMBus bus specifications.

Typical(1)

Limits(2)

Units

Symbol

Parameter

Conditions

(Limit)

fSMB

SMBus Clock Frequency

100

kHz (max)

kHz (min)

tLOW

SMBus Clock Low Time

10 % to 10 %

1.3

μs (min)

ms (max)

tLOWMEXT Cumulative Clock Low Extend Time

ms (max)

tHIGH

SMBus Clock High Time

90 % to 90%

0.6

μs (min)

tR,SMB

SMBus Rise Time

10% to 90%

μs (max)

tF,SMB

SMBus Fall Time

90% to 10%

0.3

ns (max)

tOF

Output Fall Time

CL = 400 pF,

250

ns (max)

IO = 3 mA

tTIMEOUT

SMBData and SMBCLK Time Low for Reset of

ms (min)

Serial Interface (3)

ms (max)

SMBCLK (Clock) Period

μs (min)

t2, tSU;DAT

Data In Setup Time to SMBCLK High

100

ns (min)

t3, tHD;DAT

Data Out Stable after SMBCLK Low

300

ns (min)

TBD

ns (max)

t4, tHD;STA

SMBData Low Setup Time to SMBCLK Low

100

ns (min)

t5, tSU;STO

SMBData High Delay Time after SMBCLK High

100

ns (min)

(Stop Condition Setup)

t6, tSU;STA

SMBus Start-Condition Setup Time

0.6

μs (min)

tBUF

SMBus Free Time

1.3

μs (min)

(1)

Typicals are at TA = 25°C and represent most likely parametric norm.

(2)

Limits are ensured to AOQL (Average Outgoing Quality Level).

(3)

Holding the SMBData and/or SMBCLK lines Low for a time interval greater than tTIMEOUT will cause the LM82 to reset SMBData and

SMBCLK to the IDLE state of an SMBus communication (SMBCLK and SMBData set High).

Figure 2. SMBus Communication

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