Rainbow-electronics LM99 Manual de usuario descargar pdf (Pagina 5)

Logic Electrical Characteristics

DIGITAL DC CHARACTERISTICS Unless otherwise noted, these specifications apply for V

= +3.0 to 3.6 Vdc. Boldface

limits apply for T

MIN

to T

MAX

; all other limits T

= +25˚C, unless otherwise noted.

Symbol Parameter Conditions Typical Limits Units

(Note 6) (Note 7) (Limit)

SMBData, SMBCLK INPUTS

IN(1)

Logical “1” Input Voltage 2.1 V (min)

IN(0)

Logical “0”Input Voltage 0.8 V (max)

IN(HYST)

SMBData and SMBCLK Digital

Input Hysteresis

400 mV

IN(1)

Logical “1” Input Current V

0.005

10 µA (max)

IN(0)

Logical “0” Input Current V

= 0 V −0.005

10 µA (max)

Input Capacitance 5 pF

ALL DIGITAL OUTPUTS

High Level Output Current V

10 µA (max)

SMBus Low Level Output Voltage I

=4mA

=6mA

0.4

0.6

V (max)

SMBus Digital Switching Characteristics

Unless otherwise noted, these specifications apply for V

= +3.0 Vdc to +3.6 Vdc, C

(load capacitance) on output lines = 80

pF. Boldface limits apply for T

MIN

to T

MAX

; all other limits T

= +25˚C, unless otherwise noted. The switch-

ing characteristics of the LM99 fully meet or exceed the published specifications of the SMBus version 2.0. The following pa-

rameters are the timing relationships between SMBCLK and SMBData signals related to the LM99. They adhere to but are not

necessarily the SMBus bus specifications.

Symbol Parameter Conditions Typical Limits Units

(Note 6) (Note 7) (Limit)

SMB

SMBus Clock Frequency 100

kHz (max)

kHz (min)

LOW

SMBus Clock Low Time from V

IN(0)

max to

IN(0)

max

4.7

µs (min)

ms (max)

HIGH

SMBus Clock High Time from V

IN(1)

min to V

IN(1)

min 4.0 µs (min)

R,SMB

SMBus Rise Time (Note 12) 1 µs (max)

F,SMB

SMBus Fall Time (Note 13) 0.3 µs (max)

Output Fall Time C

= 400 pF,

= 3 mA, (Note 13)

250 ns (max)

TIMEOUT

SMBData and SMBCLK Time Low for

Reset of Serial Interface (Note 14)

ms (min)

ms (max)

SU;DAT

Data In Setup Time to SMBCLK High 250 ns (min)

HD;DAT

Data Out Stable after SMBCLK Low 300

900

ns (min)

ns (max)

HD;STA

Start Condition SMBData Low to SMBCLK

Low (Start condition hold before the first

clock falling edge)

100 ns (min)

SU;STO

Stop Condition SMBCLK High to SMBData

Low (Stop Condition Setup)

100 ns (min)

SU;STA

SMBus Repeated Start-Condition Setup

Time, SMBCLK High to SMBData Low

0.6 µs (min)

BUF

SMBus Free Time Between Stop and Start

Conditions

1.3 µs (min)

LM99

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Rainbow-electronics LM99 Manual de usuario Pagina 5

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