AS87196CB datasheet(24/33 Pages) INTEL

24 / 33 page

87C196CA87C196CB

EXTERNAL CLOCK DRIVE

Symbol

Parameter

Min

Max

Units

1TXLXL

Oscillator Frequency

MHz

TXLXL

Oscillator Period (TOSC)

500

250

TXHXX

High Time

035 c TOSC

065 TOSC

TXLXX

Low Time

035 c TOSC

065 TOSC

TXLXH

Rise Time

TXHXL

Fall Time

EXTERNAL CLOCK DRIVE WAVEFORMS

272405 – 23

AC TESTING INPUT OUTPUT WAVEFORMS

272405 – 24

AC Testing inputs are driven at 35V for a logic ‘‘1’’ and

045V for a logic ‘‘0’’ Timing measurements are made

at 20V for a logic ‘‘1’’ and 08V for logic ‘‘0’’

FLOAT WAVEFORMS

272405 – 25

For timing purposes a Port Pin is no longer floating

when a 150 mV change from load voltage occurs and

begins to float when a 150 mV change from the loading

VOH VOL level occurs IOL IOH s 15 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 signalcondition points

Conditions

Signals

HHigh

AAddress

HAHLDA

LLow

BBHE

LALEADV

VValid

BRBREQ

QData Out

XNo Longer

CCLKOUT

RDRD

Valid

DDATA

WWR WRH WRI

ZFloating

GBuswidth

XXTAL1

HHOLD

YREADY

AS87196CB データシート(PDF) 24 Page - Intel Corporation

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