ADT7476A
http://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
Analog-to-Digital Converter (Including MUX and Attentuators)
Input Resistance
For V
CCP
Channel
For All Other Channels
70
70
200
114
kW
Fan RPM-to-Digital Converter
Accuracy
0癈 ?T
A
?70癈
40癈 ?T
A
?+120癈
?
?0
%
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
mA
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
mA
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
?
mA
Input Low Current, I
IL
V
IN
= 0
?
mA
Input Capacitance, C
IN
5.0
pF
Serial Bus Timing (See Figure 2)
Clock Frequency, f
SCLK
10
400
kHz
Glitch Immunity, t
SW
50
ns
Bus Free Time, t
BUF
4.7
ms
SCL Low Time, t
LOW
4.7
ms
SCL High Time, t
HIGH
4.0
50
ms
SCL, SDA Rise Time, t
r
1,000
ns
SCL, SDA Fall Time, t
f
300
ms
Data Setup Time, t
SU;DAT
250
ns
Detect Clock Low Timeout, t
TIMEOUT
Can be Optionally Disabled
15
35
ms
1. All voltages are measured with respect to GND, unless otherwise specified. Typical voltages are T
A
= 25癈 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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