LM79 datasheet(5/31 Pages) NSC

5 / 31 page

Absolute Maximum Ratings (Notes 1, 2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Positive Supply Voltage (V

CC)

6.5V

Voltage on Any Input or Output Pin

−0.3V to (V

CC+0.3V)

Ground Difference (GNDD–GNDA)

±300 mV

Input Current at any Pin (Note 3)

±5mA

Package Input Current (Note 3)

±20 mA

Maximum Junction Temperature

J max)

150˚C

ESD Susceptibility(Note 5)

Human Body Model

2000V

Machine Model

175V

Soldering Information

PQFP Package (Note 6) :

Vapor Phase (60 seconds)

215˚C

Infrared (15 seconds)

220˚C

Storage Temperature

−65˚C to +150˚C

Operating Ratings(Notes 1, 2)

Operating Temperature Range

MIN ≤ TA ≤ TMAX

LM79

−55˚C

≤ T

A ≤ +125˚C

Specified Temperature Range

MIN ≤ TA ≤ TMAX

LM79

−10˚C

≤ T

A ≤ +100˚C

Junction to Ambient Thermal Resistance (

JA(Note 4) )

NS Package ID: VGZ44A

62˚C/W

Supply Voltage (V

CC)

+4.25V to +5.75V

Ground Difference

(IGNDD–GNDAI)

≤100 mV

IN Voltage Range

−0.05V to V

CC + 0.05V

DC Electrical Characteristics

The following specifications apply for +4.25 V

DC ≤VCC ≤ +5.75 VDC,fSYSCLK = 8.33 MHz, RS =25Ω, unless otherwise speci-

fied. Boldface limits apply for T

A =TJ =TMIN to TMAX; all other limits TA =TJ = 25˚C. (Note 7)

Symbol

Parameter

Conditions

Typical

Limits

Units

(Note 8)

(Note 9)

(Limits)

POWER SUPPLY CHARACTERISTICS

Supply Current

Interface Inactive

1.0

mA (max)

Shutdown Mode

µA

TEMPERATURE-TO-DIGITAL CONVERTER CHARACTERISTICS

Accuracy

−10˚C

≤ T

A ≤ +100˚C

±3

˚C (max)

Resolution

˚C (min)

ANALOG-TO-DIGITAL CONVERTER CHARACTERISTICS

Resolution (8 bits with full-scale at 4.096V)

TUE

Total Unadjusted Error

(Note 10)

±1

% (max)

DNL

Differential Non-Linearity

±1

LSB (max)

PSS

Power Supply Sensitivity

±1

%/V

Total Monitoring Cycle Time

(Note 11)

1.0

1.5

sec (max)

OP AMP CHARACTERISTICS

Output Current (Sourcing)

µA

Input Offset Voltage

OUT =50 µA

±1mV

Input Bias Current

±0.1

PSRR

DC Open Loop Gain

Gain Bandwidth Product

500

kHz

MULTIPLEXER/ADC INPUT CHARACTERISTICS

On Resistance

400

2000

Ω (max)

Off Channel Leakage Current

±0.1

Input Current (On Channel Leakage Current)

±0.1

FAN RPM-TO-DIGITAL CONVERTER

Accuracy

+25˚C

≤ T

A ≤ +75˚C

±10

% (max)

−10˚C

≤ T

A ≤ +100˚C

±15

% (max)

Full-scale Count

255

(max)

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