TS68230 datasheet(48/61 Pages) STMICROELECTRONICS

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SECTION 6

ELECTRICAL SPECIFICATIONS

This section contains electrical specifications and associated timing information for the TS68230.

6.1 ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

VCC

Supply Voltage

– 0.3 to + 7.0

VIN

Input Voltage

– 0.3 to + 7.0

T A

Operating Temperature Range

TS68230C

TS68230V

T L to T H

0to + 70

– 40to+ 85

°C

T stg

Storage Temperature

– 55 to + 150

°C

This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields ; however, it is

advised that normal precautions be taken to avoid application of any voltage higher than maximum-rated voltages to this high-

6.2 THERMAL DATA

θJA

Thermal Resistance Plastic

°C/W

impedance circuit. Reliability of operation is enhanced if unu-

sed inputs are tied to an appropriate logic voltage level (e.g.,

either VSS or VCC).

6.3. POWER CONSIDERATIONS

The average chip-junction temperature, TJ, in

°C

can be obtained from :

TJ = TA + (PD

• θ JA)

Where :

TA = Ambient Temperature,

°C

θJA = Package Thermal Resistance, Junction-to-

Ambient,

°C/W

PD = PINT + PI/O

PINT = ICC x VCC, Watts - Chip Internal Power

PI/O = Power Dissipation on Input and Output Pins

-User Determined

For most applications PI/O < PINT and can be neglec-

ted.

An approximate relationship between PD and TJ (if

PI/O is neglected) is :

PD = K (TJ + 273

°C)

Solving equations 1 and 2 for K gives :

K = PD

• (TA + 273°C) + θJA • PD2

Where K is a constant pertaining to the particular

part. K can be determined from equation 3 by mea-

suring PD (at equilibrium) for a known TA. Using this

value of K the values of PD and TJ can be obtained

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