MIC74

Micrel

MIC74

4

August 1, 2000

Symbol

Parameter

Condition

Min

Typ

Max

Units

/ALERT

V

OL

Output Low Voltage

I

0.4

V

I

LEAK

Leakage Current

V

–1

±250

+1

µA

AC Characteristics

t

START

Fan Startup Interval

normal operation

0.5

1

3.3

sec

t

PULSE

Minimum Pulse-Width

minimum pulse-width on P

n to

10

ns

generate an interrupt, Note 7

t

/INT

Interrupt Delay

interrupt delay from state change

4

µs

on P

n to /ALERT

≤ V

t

/IR

Delay from Status Read or ARA

4

µs

Response to /ALERT

≥ V

OH

t

HD:STA

Hold Time, Note 7

hold time after repeated start condition.

4.0

µs

after this period, the first clock is generated.

t

SU:STA

Setup Time, Note 7

repeated start condition setup time

4.7

µs

t

SU:STO

Stop Condition Setup Time

Note 7

4.0

µs

t

HD:DAT

Data Hold Time

Note 7

500

ns

t

SU:DAT

Data Setup Time

Note 7

0ns

t

TIMEOUT

Clock Low Time-Out

Notes 4, 7

25

35

ms

t

LOW

Clock Low Period

Notes 5, 7

4.7

µs

t

HIGH

Clock High Period

Notes 5, 7

4.0

50

µs

t

F

Clock/Data Fall Time

Notes 6, 7

300

ns

t

R

Clock/Data Rise Time

Notes 6, 7

1000

ns

t

BUF

Bus free time between stop and

Note 7

4.7

µs

Start condition

Note 1.

Exceeding the absolute maximum rating may damage the device.

Note 2.

The device is not guaranteed to function outside its operating rating.

Note 3.

Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.

Note 4.

Devices participating in a transfer will timeout when any clock low exceeds the value of t

timeout condition must reset the communication no later than t

both a master and a slave as it incorporates the cumulative stretch limit for both a master (10ms) and a slave (25ms).

Note 5.

t

Note 6.

Rise and fall time is defined as follows: t

Note 7.

Guaranteed by design.

Timing Definitions

DATA

CLK

StoP

StoP

Start

Start