TS68230 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TS68230

HMOS PARALLEL INTERFACE/TIMER

STMicroelectronics 

TS68230

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

V

VIN Input Voltage

TA Operating Temperature Range

TS68230C

TS68230V

– 0.3 to + 7.0

V

T L to T H

°C

0 to + 70

– 40 to + 85

Tstg 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

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

50

°C/W

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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