LM87 datasheet(6/45 Pages) TI2

6 / 45 page

LM87

SNAS034J – APRIL 2000 – REVISED MARCH 2013

www.ti.com

DC Electrical Characteristics (continued)

The following specifications apply for +2.8 VDC ≤ V

+ ≤ +3.8 V

DC, Analog voltage inputs RS = 510 Ω, unless otherwise specified.

Boldface limits apply for TA = T J = TMIN to TMAX; all other limits TA = TJ = 25 °C.

(1)

Typical

Limits

Units

Symbol

Parameter

Conditions

(2)

(3)

(Limits)

FAN RPM-TO-DIGITAL CONVERTER

+25 °C

≤ TA ≤ +75 °C

±10

% (max)

Fan RPM Error

−10 °C ≤ TA ≤ +100 °C

±15

% (max)

−40 °C ≤ TA ≤ +125 °C

±20

% (max)

Full-scale Count

255

(max)

Divisor = 1, Fan Count = 153

8800

RPM

(9)

Divisor = 2, Fan Count = 153

4400

RPM

(9)

FAN1 and FAN2 Nominal Input

RPM (See FAN INPUTS)

Divisor = 3, Fan Count = 153

2200

RPM

(9)

Divisor = 4, Fan Count = 153

1100

RPM

(9)

DIGITAL OUTPUTS (NTEST_OUT)

IOUT = ±3.0 mA at

2.4

V (min)

VOUT(1)

Logical “1” Output Voltage

V+ = +2.8 V

IOUT = ±3.0 mA at

0.4

V (max)

VOUT(0)

Logical “0” Output Voltage

V+ = +3.8 V

OPEN- DRAIN DIGITAL OUTPUTS (SMBData, RESET#, CI, INT#, THERM#)

VOUT(0)

Logical “0” Output Voltage (SMBData)

IOUT = −755 μA

0.4

V (min)

VOUT(0)

Logical “0” Output Voltage (Others)

IOUT = −3 mA

0.4

V (min)

IOH

High Level Output Current

VOUT = V

μA (max)

RESET# and Chassis Intrusion

ms (min)

Pulse Width

DIGITAL INPUTS: VID0–VID4, NTEST_IN, ADD/NTEST_OUT, Chassis Intrusion (CI)

VIN(1)

Logical “1” Input Voltage

2.0

V (min)

VIN(0)

Logical “0” Input Voltage

0.8

V (max)

SMBus DIGITAL INPUTS (SMBCLK, SMBData)

VIN(1)

Logical “1” Input Voltage

2.1

V (min)

VIN(0)

Logical “0” Input Voltage

0.8

V (max)

VHYST

Input Hysteresis Voltage

243

Tach Pulse Logic Inputs (FAN1, FAN2)

VIN(1)

Logical “1” Input Voltage

0.7 × V+

V (min)

VIN(0)

Logical “0” Input Voltage

0.3 × V+

V (max)

ALL DIGITAL INPUTS

IIN(1)

Logical “1” Input Current

VIN = V

−12

μA (min)

IIN(0)

Logical “0” Input Current

VIN = 0 VDC

μA (max)

CIN

Digital Input Capacitance

(9)

The total fan count is based on 2 pulses per revolution of the fan tachometer output.

Submit Documentation Feedback

Product Folder Links: LM87

LM87 Datasheet(PDF) 6 Page - Texas Instruments

LM87 Datasheet(HTML) 6 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

Datasheet Download

Link URL