80C198 Ver la hoja de datos (PDF) - Intel

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componentes Descripción

Fabricante

80C198

COMMERCIAL/EXPRESS CHMOS MICROCONTROLLER

Intel 

EXTERNAL CRYSTAL CONNECTIONS

8XC198

EXTERNAL CLOCK CONNECTIONS

272034 – 32

NOTE

Keep oscillator components close to chip and use

short direct traces to XTAL1 XTAL2 and VSS When

using crystals C1 e 20 pF C2 e 20 pF When using

ceramic resonators consult manufacturer for recom-

mended capacitor values

272034 – 33

NOTE

Required if open collector TTL driver used Not need-

ed if CMOS driver is used

AC TESTING INPUT OUTPUT WAVEFORMS

FLOAT WAVEFORMS

272034 – 26

AC Testing inputs are driven at 2 4V for a Logic ‘‘1’’ and 0 45V for

a Logic ‘‘0’’ Timing measurements are made at 2 0V for a Logic

‘‘1’’ and 0 8V for a Logic ‘‘0’’

272034 – 27

For Timing Purposes a Port Pin is no Longer Floating when a

200 mV change from Load Voltage Occurs and Begins to Float

when a 200 mV change from the Loaded VOH VOL Level occurs

IOL IOH e g15 mA

EXPLANATION OF AC SYMBOLS

Each symbol is two pairs of letters prefixed by ‘‘T’’ for time The characters in a pair indicate a signal and its

condition respectively Symbols represent the time between the two signal condition points

Conditions

Signals

H - High

A - Address

L - Low

D - DATA IN

V - Valid

L - ALE ADV

X - No Longer Valid

Q - DATA OUT

Z - Floating

R - RD

W - WR

X - XTAL1

Y - READY

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