EF6805P2 datasheet(3/31 Pages) STMICROELECTRONICS

3 / 31 page

POWER CONSIDERATIONS

The average chip-junction temperature, TJ, in C can

be obtained from :

TJ =TA +(PD.JA) (1)

Where :

TA = Ambient Temperature, C

JA = Package Thermal Resistance, Junction-to-Am-

bient, C/W

PD =PINT +PPORT

PINT =ICC xVCC, Watts - Chip Internal Power

PPORT = Port Power Dissipation, Watts - User De-

termined

For most applications PPORT PINT and can be ne-

glected. PPORT may become significant if the device

is configured to drive Darlington bases or sink LED

loads.

An approximate relationship between PD and TJ (if

PPORT is neglected) is :

PD =K +(TJ + 273C) (2)

Solving equations 1 and 2 for K gives :

K= PD.(TA + 273C) + JA.PD

2 (3)

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

by solving equations (1) and (2) iteratively for any

value of TA.

ELECTRICAL CHARACTERISTICS(V CC = + 5.25Vdc ± 0.5Vdc, VSS = 0Vdc, TA =TL to TH unless

otherwise noted)

Symbol

Parameter

Min.

Typ.

Max.

Unit

VIH

Input High Voltage

RESET (4.75

≤ VCC ≤ 5.75)

(V CC < 4.75)

INT (4.75

≤ VCC ≤ 5.75)

(VCC < 4.75)

All Other (except timer)

4.0

VCC – 0.5

4.0

VCC – 0.5

2.0

•

V CC

VIH

Input High Voltage Timer

Timer Mode

Self-check Mode

2.0

9.0

10.0

VCC + 1.0

15.0

VIL

Input Low Voltage

RESET

INT

All Other

VSS

•

0.8

1.5

0.8

VIRE S +

VIRE S –

RESET Hystereris Voltages (see figures 10, 11 and 12)

”Out of Reset”

”Into Reset”

2.1

0.8

4.0

2.0

VINT

INT Zero Crossing Input Voltage, Through a

Capacitor

Vac p-p

Power Dissipation - (no port loading, VCC = 5.75V)

T A =0

°C

TA =– 40°C

520

580

740

800

Cin

Input Capacitance

EXTAL

All Other

VLVR

Low Voltage Recover

4.75

VLVI

Low Voltage Inhibit

2.75

3.75

4.70

I in

Input Current

TIMER (Vin = 0.4V)

INT (Vin = 2.4V to VCC)

EXTAL (Vin = 2.4V to VCC - crystal option)

(Vin = 0.4V - crystal option)

RESET (Vin = 0.8V) - External Capacitor Charging

Current

– 40.0

– 1600

–40

µA

* Due to internal biasing this input (when unused) floats to approximately 2.2V.

EF6805U3

3/31

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