8XC196MD

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

H

High

L

Low

V

Valid

X

No Longer Valid

Z

Floating

A

Address

B

BHE

C

CLKOUT

D

DATA

G

Buswidth

H

HOLD

HA

HLDA

L

ALEADV

BR

BREQ

R

RD

W

WR WRH WRL

X

XTAL1

Y

READY

Q

Data Out

The system must meet the following specifications to work with the 87C196MD

Symbol

Parameter

Min

Max

Units

Notes

Frequency on XTAL1

8

16

MHz

3

625

125

ns

Address Valid to READY Setup

ns

ALE Low to READY Setup

ns

4

Not READY Time

No Upper Limit

ns

READY Hold after CLKOUT Low

0

ns

1

READY Hold after ALE Low

ns

1

Address Valid to BUSWIDTH Setup

ns

ALE Low to BUSWIDTH Setup

ns

4

Buswidth Hold after CLKOUT Low

0

ns

Address Valid to Input Data Valid

ns

2

RD Active to Input Data Valid

ns

2

CLKOUT Low to Input Data Valid

ns

End of RD to Input Data Float

ns

Data Hold after RD Inactive

0

ns

NOTES

1 If Max is exceeded additional wait states will occur

3 Testing performed at 8 MHz However the device is static by design and will typically operate below 1 Hz

speed designs

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