M80C286 datasheet(40/60 Pages) INTEL

40 / 60 page

M80C286

Table 19 M80C286 Systems Recommended Pull Up Resistor Values

M80C286 Pin and Name

Pullup Value

Purpose

4S1

Pull S0 S1 and PEACK inactive during M80C286 hold periods

5S0

20 KX g10%

(Note 1)

6PEACK

63READY

910X g5%

Pull READY inactive within required minimum time (CL e 150 pF

lR s 7 mA)

NOTE

1 Pullup resistors are not required for S0 and S1 when the corresponding pins on the M82C284 are connected to S0 and

M80286 IN-CIRCUIT EMULATION

CONSIDERATIONS

One of the advantages of using the M80C286 is that

full in-circuit emulation development support is avail-

able

thru

either

the

I2ICE

80286

probe

for

8 MHz10 MHz or ICE286 for 125 MHz designs To

utilize these powerful tools it is necessary that the

designer be aware of a few minor parametric and

functional differences between the M80C286 and

the in-circuit emulators The I2ICE datasheet (I2ICE

Integrated Instrumentation and In-Circuit Emulation

System order

210469) contains a detailed de-

scription

these

design

considerations

The

ICE286 Fact Sheet ( 280718) and User’s Guide

( 452317) contain design considerations for the

80286 125 MHz microprocessor It is recommended

that the appropriate document be reviewed by the

80286 system designer to determine whether or not

these differences affect the design

PACKAGE THERMAL

SPECIFICATIONS

The M80C286 Microprocessor is specified for opera-

tion when case temperature (TC) is within the range

of b55 C– a125 C Case temperature unlike ambi-

ent temperature is easily measured in any environ-

ment to determine whether the M80C286 Microproc-

essor is within the specified operating range The

case temperature should be measured at the center

of the top surface of the component

The maximum ambient temperature (TA) allowable

without violating TC specifications can be calculated

from the equations shown below TJ is the 80C286

junction temperature P is the power dissipated by

the M80C286

TJ e TC a P

iJC

TA e TJ b P

iJA

TC e TA a P

iJA b iJC

Values for iJA and iJC are given in Table 20 Table

21 shows the maximum TA allowable (without ex-

ceeding TC)

Junction temperature calculations should use an ICC

value that is measured without external resistive

loads The external resistive loads dissipate addi-

tional power external to the M80C286 and not on

the die This increases the resistor temperature not

the die temperature The full capacitive load (CL e

100 pF) should be applied during the ICC measure-

ment

Table 20 Thermal Resistances ( CW)

Package

iJC

68-Lead PGA

68-Lead CQFP

NOTE

The numbers in Table 20 were calculated using an

ICC of 150 mA which is representative of the worst

case ICC at TC e 125 C with the outputs unloaded

Table 21 Maximum (TA)

Package

TA ( C)

68-Lead PGA

105

68-Lead CQFP

108

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