ADT7476A
www.onsemi.com
4
Table 3. ELECTRICAL CHARACTERISTICS
(continued)
(T
A
= T
MIN
to T
MAX
, V
CC
= V
MIN
to V
MAX
, unless otherwise noted) (Note 1)
Parameter
Unit
Max
Typ
Min
Conditions
Fan RPM-to-Digital Converter
Accuracy
0
°
C
≤
T
A
≤
70
°
C
−40
°
C
≤
T
A
≤
+120
°
C
−
−
−
−
±
6
±
10
%
Full-Scale Count
−
−
65,535
Nominal Input RPM
Fan Count = 0xBFFF
Fan Count = 0x3FFF
Fan Count = 0x0438
Fan Count = 0x021C
−
−
−
−
109
329
5,000
10,000
−
−
−
−
RPM
Open-Drain Digital Outputs, PWM1 TO PWM3, XTO
Current Sink, I
OL
−
−
8.0
mA
Output Low Voltage, V
OL
I
OUT
= −8.0 mA
−
−
0.4
V
High Level Output Current, I
OH
V
OUT
= V
CC
−
0.1
20
m
A
Open-Drain Serial Data Bus Output (SDA)
Output Low Voltage, V
OL
I
OUT
= −4.0 mA
−
−
0.4
V
High Level Output Current, I
OH
V
OUT
= V
CC
−
0.1
1.0
m
A
SMBus Digital Inputs (SCL, SDA) (Note 2)
Input High Voltage, V
IH
2.0
−
−
V
Input Low Voltage, V
IL
−
−
0.8
V
Hysteresis
−
500
−
mV
Digital Input Logic Levels (TACH Inputs)
Input High Voltage, V
IH
Maximum Input Voltage
2.0
−
5.5
V
Input Low Voltage, V
IL
Minimum Input Voltage
−0.3
−
0.8
V
Hysteresis
−
0.5
−
V p-p
Digital Input Logic Levels (THERM) ADTL+
Input High Voltage, V
IH
0.75
×
V
CCP
−
−
V
Input Low Voltage, V
IL
−
−
0.8
V
Digital Input Current
Input High Current, I
IH
V
IN
= V
CC
−
±
1
−
m
A
Input Low Current, I
IL
V
IN
= 0
−
±
1
−
m
A
Input Capacitance, C
IN
−
5.0
−
pF
Serial Bus Timing
(See Figure 2)
Clock Frequency, f
SCLK
10
−
400
kHz
Glitch Immunity, t
SW
@ 100 kHz
−
−
50
ns
Bus Free Time, t
BUF
@ 100 kHz
4.7
−
−
m
s
SCL Low Time, t
LOW
@ 100 kHz
4.7
−
−
m
s
SCL High Time, t
HIGH
@ 100 kHz
4.0
−
50
m
s
SCL, SDA Rise Time, t
r
@ 100 kHz
−
−
1,000
ns
SCL, SDA Fall Time, t
f
@ 100 kHz
−
−
300
m
s
Data Setup Time, t
SU;DAT
@ 100 kHz
250
−
−
ns
Detect Clock Low Timeout, t
TIMEOUT
Can be Optionally Disabled
15
−
35
ms
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
1. All voltages are measured with respect to GND, unless otherwise specified. Typical voltages are T
A
= 25
°
C and represent a parametric norm.
Logic inputs accept input high voltages up to V
MAX
, even when the device is operating down to V
MIN
. Timing specifications are tested at logic
levels of V
IL
= 0.8 V for a falling edge, and V
IH
= 2.0 V for a rising edge.
2. SMBus timing specifications are guaranteed by design and are not production tested.
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