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