MC6840 판매점 - Programmable Timer Module

MC6840 반도체 회로 부품 판매점

Programmable Timer Module

Motorola Semiconductors

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MOTOROLA

s SEMICONDUCTOR

TECHNICAL DATA

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MC6840

Programmable Timer Module (PTM)

.!A,.),,),,

The MC6840 is a programmable subsystem component of the M6800 Family designed to provide

variable system time intervals.

),{:t::t’,l,~$<.~tt”:.~$.,~*.:+.*~,:~,L+~,~,\,.1l\..,.,\.,$..

The MC6840 has three 16-bit binary counters, three corresponding control registers, and a status

andlor generate output signals. The MC6840 may be utilized for such tasks as frequency measure-

ments, event counting, interval measuring, and similar tasks. The device may be used for square

,,,.F\\.\+:~?,“!;,:&\t\+,t~+, .:?.,:t:’i’

,.,,.~.’:\~’,~<::~,.;.~.,.r+.>.+..~.,.,.,.~.

“-.’<.\~~\*~;.Y:\.\tL>*,.\;:.:.L~*”4.,*!,:,s+”

wave generation, gated delay signals, single pulses of controlled

tion as well as system interrupts.

duration,

and pulse width

modu,>l~~?+~‘$’’t’*t.<,$.v, ~

Three

MOTOROLA INC , 1988

MOTOROLA

@ DS9802R3

BLOCK DIAGRAM

I Rea,ster

E (Enable)

A Clock

—.

J!{ ‘,~t..

The average

where:

chip-juncti~w.,$,t>>~5, ~-*,$$e: ratu

~;..,.d,s:P>:.>$. i:<,<3,..:. *,~

‘.~.~.$.’

re, TJ, in ‘C can be obtained from:

TJ =TA+ (PD*OJA)

OJA

= Arn~~~m\,fem peratu re, ‘C

= +P@k~d’’Thermal Resistance, Junction-to-Ambient, ‘Cm

pD ,~~~~~+ PpORT

(1)

PINT , !kd~~ x Vcc, Watts — Chip Internal Power

Pp~T3W$=’*~ort Power Dissipation, Watts — User Determined

~ *.;’.?,,,4* ~

~~$@~~#appliCatiOnS

ppORT<plNTand can be neglected. ppORTmay

become significant if the device is configured

.AQ&+$ve Darlington bases or sink LED loads.

~~~~%approximate relationship between PD and TJ (if PpORT is neglected) is:

PD= K: (TJ +273°C)

(2)

Solving equations (1) and (2) for K gives:

K=PD q (TA+2730C) +0JNPD2

(3)

where K is a constant pertaining to the particular part. K can be determined from equation (3) by measuring 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

MOTOROLA

MC6840

DS9802R3

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MC6840 반도체 회로 부품 판매점

Programmable Timer Module

국내 전력반도체 판매점

일반적인 전자부품 판매점

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