LM73 datasheet(6/26 Pages) TI1

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VIH

VIL

SMBCLK

VIH

SMBDAT

tBUF

tHD;STA

tLOW

tHD;DAT

tHIGH

tSU;DAT

tSU;STA

tSU;STO

LM73

SNIS141D – OCTOBER 2005 – REVISED MAY 2009

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LOGIC ELECTRICAL CHARACTERISTICS - SMBus DIGITAL SWITCHING CHARACTERISTICS

Unless otherwise noted, these specifications apply for VDD = +2.7 V to +5.5 V, CL (load capacitance) on output lines = 400 pF.

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

Symbol

Parameter

Conditions

Typical(1)

Limits(2)

Units

(Limit)

fSMB

SMBus Clock Frequency

No minimum clock frequency

400

kHz (max)

if Time-Out feature is

disabled.

tLOW

SMBus Clock Low Time

300

ns (min)

tHIGH

SMBus Clock High Time

300

ns (min)

tF;SMBO

Output Fall Time(3)

CL = 400 pF

250

ns (max)

IPULL-UP ≤ 3 mA

tTIMEOUT

SMBDAT and SMBCLK Time Low for Reset of

ms (min)

Serial Interface(4)

ms (max)

tSU;DAT

Data In Setup Time to SMBCLK High

100

ns (min)

tHD;DATI

Data Hold Time: Data In Stable after SMBCLK

ns (min)

Low

tHD;DATO

Data Hold Time: Data Out Stable after SMBCLK

ns (min)

Low

tHD;STA

Start Condition SMBDAT Low to SMBCLK Low

ns (min)

(Start condition hold before the first clock falling

edge)

tSU;STO

Stop Condition SMBCLK High to SMBDAT Low

ns (min)

(Stop Condition Setup)

tSU;STA

SMBus Repeated Start-Condition Setup Time,

ns (min)

SMBCLK High to SMBDAT Low

tBUF

SMBus Free Time Between Stop and Start

1.2

µs (min)

Conditions

tPOR

Power-On Reset Time(5)

ms (max)

(1)

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

(2)

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

(3)

The output fall time is measured from (VIH;MIN + 0.15V) to (VIL;MAX - 0.15V).

(4)

Holding the SMBDAT and/or SMBCLK lines Low for a time interval greater than tTIMEOUT will reset the LM73's SMBus state machine,

setting SMBDAT and SMBCLK pins to a high impedance state.

(5)

Represents the time from VDD reaching the power-on-reset level to the LM73 communications being functional. After an additional time

equal to one temperature conversion time, valid temperature will be available in the TEMPERATURE DATA REGISTER.

Figure 2. SMBus Communication

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