EF6805P6 Просмотр технического описания (PDF) - STMicroelectronics

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EF6805P6

8-BIT MICROCOMPUTER UNIT

STMicroelectronics 

EF6805U3

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 x VCC, 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.PD2 (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, VS S = 0Vdc, TA = TL to TH unless

otherwise noted)

Symbol

Parameter

Min.

V IH

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 IH

Input High Voltage Timer

Timer Mode

2.0

Self-check Mode

9.0

V IL

Input Low Voltage

RESET

VSS

INT

VSS

All Other

VSS

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

V IRE S –

”Out of Reset”

2.1

”Into Reset”

0.8

V IN T

INT Zero Crossing Input Voltage, Through a

2

Capacitor

PD

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

TA = 0°C

TA = – 40°C

Cin

Input Capacitance

EXTAL

All Other

VL V R

VLV I

Iin

Low Voltage Recover

Low Voltage Inhibit

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

2.75

– 40.0

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

Typ.

•

•

10.0

•

520

580

25

10

3.75

20

Max.

V CC

V CC

V CC

V CC

V CC

VCC + 1.0

15.0

0.8

1.5

0.8

4.0

2.0

4

Unit

V

V

V

V

Vac p-p

mW

740

800

pF

4.75

V

4.70

V

µA

20

50

10

– 1600

– 40

3/31

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