ADM1034
http://onsemi.com
5
Table 4. ELECTRICAL CHARACTERISTICS (T
A
 = T
MIN
 to T
MAX
, V
CC
 = V
MIN
 to V
MAX
, unless otherwise noted). (Note 1)
Parameter
Unit
Max
Typ
Min
Test Conditions/Comments
Tachometer Accuracy
Fan Speed Measurement Accuracy


?.0
%
SERIAL
 BUS
 TIMING
 (Note 4)
Clock Frequency, f
SCLK
See Figure 2 for All Parameters


400
kHz
Glitch Immunity, t
SW

50

ns
Bus Free Time, t
BUF
1.3


ms
Start Setup Time, t
SU:STA
0.6


ms
Start Hold Time, t
HD:STA
0.6


ms
Stop Condition Setup Time t
SU:STO
0.6


ms
SCL Low Time, t
LOW
1.3


ms
SCL High Time, t
HIGH
0.6


ms
SCL, SDA Rise Time, t
r


1000
ns
SCL, SDA Fall Time, t
f


300
ns
Data Setup Time, t
SU:DAT
100


ns
Detect Clock Low Timeout, t
TIMEOUT
(Note 5)
25

35
ms
1.  Typicals are at T
A
= 25癈 and represent most likely parametric norm. Standby current typ. is measured with V
CC
= 3.3 V. Timing
specifications are tested at logic levels of V
IL
= 0.8 V for a falling edge and V
IH
= 2.1 V for a rising edge.
2.  Operation at 5.5 V is guaranteed by design, not production tested.
3.  Recommend use of 100 kW pullup resistors for all open-drain outputs from the ADM1034.
4.  Guaranteed by design, not production tested.
5.  SMBus timeout disabled by default. See the SMBus section for more information.
Figure 2. Serial Bus Timing Diagram
P
S
t
SU; DAT
t
HIGH
t
F
t
HD; DAT
t
R
t
LOW
t
SU; STO
P
S
SCL
SDA
t
BUF
t
HD; STA
t
HD; STA
t
SU; STA
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