DC Electrical Characteristics (Continued)
The following specifications apply for +2.8 VDC ≤ V+ ≤ +3.8 VDC, Analog voltage inputs RS = 510 Ω, unless otherwise speci-
fied. Boldface limits apply for TA = T = TMIN to TMAX; all other limits TA = TJ = 25 ˚C.(Note 8)
J
Symbol
Parameter
Conditions
Typical
Limits
Units
(Note 9)
(Note 10)
(Limits)
DAC CHARACTERISTICS
DAC Error
0 ˚C ≤ TA ≤ +75 ˚C, V+
3.3 V, Code = 255
V+ = 3.3 V, 3/4 Scale,
code 192
=
-3.3
3
% (min)
%
+3.7
0 ˚C ≤ TA ≤ +75 ˚C, V, V+
= 3.3 V, Code = 8(Note
15)
% (max)
RL
CL
Output Load Resistance
Output Load Capacitance
VO = 2.5 V
1250
20
Ω (min)
pF (max)
FAN RPM-TO-DIGITAL CONVERTER
Fan RPM Error
+25 ˚C ≤ TA ≤ +75 ˚C
−10 ˚C ≤ TA ≤ +100 ˚C
−40 ˚C ≤ TA ≤ +125 ˚C
10
15
% (max)
% (max)
% (max)
(max)
20
Full-scale Count
255
FAN1 and FAN2 Nominal Input
RPM (See Section 6.0)
Divisor = 1, Fan Count =
153 (Note 16)
8800
4400
2200
1100
RPM
Divisor = 2, Fan Count =
153 (Note 16)
RPM
RPM
RPM
Divisor = 3, Fan Count =
153 (Note 16)
Divisor = 4, Fan Count =
153 (Note 16)
DIGITAL OUTPUTS (NTEST_OUT)
VOUT(1) Logical “1” Output Voltage
IOUT
V+ = +2.8 V
IOUT 3.0 mA at
V+ = +3.8 V
=
3.0 mA at
2.4
0.4
V (min)
V (max)
VOUT(0) Logical “0” Output Voltage
=
#
#
#
OPEN- DRAIN DIGITAL OUTPUTS (SMBData, RESET , CI, INT , THERM )
VOUT(0) Logical “0” Output Voltage (SMBData)
VOUT(0) Logical “0” Output Voltage (Others)
IOUT = −755 µA
IOUT = −3 mA
VOUT = V+
0.4
0.4
12
V (min)
V (min)
IOH
High Level Output Current
5
µA (max)
ms (min)
#
RESET and Chassis Intrusion
45
20
Pulse Width
DIGITAL INPUTS: VID0–VID4, NTEST_IN, ADD/NTEST_OUT, Chassis Intrusion (CI)
VIN(1) Logical “1” Input Voltage
2.0
0.8
V (min)
V (max)
VIN(0) Logical “0” Input Voltage
SMBus DIGITAL INPUTS (SMBCLK, SMBData)
VIN(1) Logical “1” Input Voltage
2.1
0.8
V (min)
V (max)
mV
VIN(0) Logical “0” Input Voltage
VHYST Input Hysteresis Voltage
243
Tach Pulse Logic Inputs (FAN1, FAN2)
VIN(1) Logical “1” Input Voltage
0.7 x V+
0.3 x V+
V (min)
V (max)
VIN(0) Logical “0” Input Voltage
ALL DIGITAL INPUTS
IIN(1)
IIN(0)
CIN
Logical “1” Input Current
Logical “0” Input Current
Digital Input Capacitance
VIN = V+
−12
12
µA (min)
µA (max)
pF
VIN = 0 VDC
20
5
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