Rainbow-electronics LM93 Manual de usuario descargar pdf (Pagina 88)

AC Electrical Characteristics

The following limits apply for +3.0 V

to +3.6 V

, unless otherwise noted. Bold face limits apply for T

MIN

MAX

of the operating range; all other limits T

= 25˚C unless otherwire noted.

Symbol Parameter Conditions

Typical

(Note 9)

Limits

(Note 10)

Units

(Limits)

FAN RPM-TO-DIGITAL CHARACTERISTICS

Counter Resolution 14 bits

Number of fan tach pulses count is

based on

2 pulses

Counter Frequency 22.5 kHz

Accuracy

6 % (max)

PWM OUTPUT CHARACTERISTICS

Frequency Tolerances

6 % (max)

Duty-Cycle Tolerance

6 % (max)

RESET INPUT/OUTPUT CHARACTERISTICS

Output Pulse Width

Upon Power Up

250

330

ms (min)

ms (max)

Minimum Input Pulse Width 10 µs (min)

Reset Output Fall Time 1.6V to 0.4V Logic Levels 1 µs (max)

SMBUS TIMING CHARACTERISTICS

SMBCLK

SMBCLK (Clock) Clock Frequency 10

100

kHz (min)

kHz (max)

BUF

SMBus Free Time between Stop and

Start Conditions

4.7 µs (min)

HD;STA

Hold time after (Repeated) Start

Condition. After this period, the first

clock is generated.

4.0 µs (min)

SU;STA

Repeated Start Condition Setup Time 4.7 µs (min)

SU;STO

Stop Condition Setup Time 4.0 µs (min)

SU;DAT

Data Input Setup Time to SMBCLK

High

250 ns (min)

HD;DAT

Data Output Hold Time after SMBCLK

Low

300

930

ns (min)

ns (max)

LOW

SMBCLK Low Period 4.7

µs (min)

µs (max)

HIGH

SMBCLK High Period 4.0

µs (min)

µs (max)

Rise Time 1 µs (max)

Fall Time 300 ns (max)

TIMEOUT

Timeout

SMBDAT or SMBCLK low

time required to

reset the Serial Bus

Interface to the Idle State

ms (min)

ms (max)

POR

Time in which a device must be

operational after power-on reset

+2.8V 500 ms (max)

Capacitance Load on SMBCLK and

SMBDAT

400 pF (max)

LM93

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