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MIC74_06 Datasheet, PDF (4/18 Pages) Micrel Semiconductor – 2-Wire Serial I/O Expander and Fan Controller
◁
Micrel, Inc.
MIC74
Symbol Parameter
Condition
Min
Typ
Max Units
AC Characteristics
tSTART
tPULSE
Fan Startup Interval
Minimum Pulse-Width
normal operation
0.5
1
3.3
sec
minimum pulse-width on Pn to generate
10
ns
an interrupt, Note 7
t/INT
Interrupt Delay
interrupt delay from state change on Pn to
/ALERT ≤ VOL, Note 7
t/IR
Delay from Status Read or ARA
Response to /ALERT ≥ VOH
tHD:STA
Hold Time, Note 7
hold time after repeated start condition,
4
after this period, the first clock is
generated
4
µs
4
µs
µs
tSU:STA
Setup Time, Note 7
repeated start condition setup time
4.7
µs
tSU:STO
Stop Condition Setup Time
Note 7
4
µs
tHD:DAT
Data Hold Time
Note 7
500
ns
tSU:DAT
Data Setup Time
Note 7
0
ns
tTIMEOUT Clock Low Time-Out
Note 4, 7
25
35
ms
tLOW
Clock Low Period
Note 5, 7
4.7
µs
tHIGH
Clock High Period
Note 5, 7
4
50
µs
tF
Clock/Data Fall Time
Note 6, 7
300
ns
tR
Clock/Data Rise Time
Note 6, 7
1000
ns
tBUF
Bus free time between stop and Note 7
Start condition
4.7
µs
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. Devices participating in a transfer will timeout when any clock low exceeds the value of tTIMEOUT(min) of 25ms. Devices that have detected a timeout
condition must reset the communication no later than tTIMEOUT(max) of 35ms. The maximum value specified must be adhered to by both a master and a
slave as it incorporates the cumulative stretch limit for both a master (10ms) and a slave (25ms).
5. tHIGH(max) provides a simple guaranteed method for devices to detect bus idle conditions.
6. Rise and fall time is defined as follows: tR = VIL(max) – 0.15V to VIH(min) + 0.15V; tF = 0.9VDD to VIL(max) – 0.15V.
7. Guaranteed by design.
Timing Definitions
CLK
tBUF
DATA
tR
tF
tLOW
tHD:STA
tHD:DAT
tSU:DAT
tHIGH
StoP Start
tSU:STA
tHD:STA
tSU:STO
Start
StoP
October 2006
4
M9999-101006
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