8XC196KB/8XC196KB16

AC CHARACTERISTICS

(Continued)

The 87C196KB will meet these specifications:

Symbol

Description

Min

Max

Units

Notes

Frequency on XTAL1 12 MHz

3.5

12.0

MHz

(Note 2)

Frequency on XTAL1 16 MHz

3.5

16.0

MHz

(Note 2)

83.3

286

ns

62.5

286

ns

XTAL1 High to CLKOUT High or Low

a

20

a

110

ns

CLKOUT Cycle Time

ns

CLKOUT High Period

ns

CLKOUT Falling Edge to ALE Rising

b

10

a

10

ns

ALE Falling Edge to CLKOUT Rising

b

15

a

15

ns

ALE Cycle Time

ns

(Note 3)

ALE High Period

ns

Address Setup to ALE Falling Edge

ns

Address Hold after ALE Falling Edge

ns

ALE Falling Edge to RD Falling Edge

ns

RD Low to CLKOUT Falling Edge

a

4

a

25

ns

RD Low Period

ns

(Note 3)

RD Rising Edge to ALE Rising Edge

ns

(Note 1)

RD Low to Address Float

a

5ns

ALE Falling Edge to WR Falling Edge

ns

CLKOUT Low to WR Falling Edge

0

a

25

ns

Data Stable to WR Rising Edge

ns

(Note 3)

CLKOUT High to WR Rising Edge

b

5

a

15

ns

WR Low Period

ns

(Note 3)

Data Hold after WR Rising Edge

ns

WR Rising Edge to ALE Rising Edge

ns

(Note 1)

BHE, INST HOLD after WR Rising Edge

ns

BHE, INST HOLD after RD Rising Edge

ns

AD8±15 hold after WR Rising Edge

ns

AD8±15 hold after RD Rising Edge

ns

NOTES

:

1. Assuming back-to-back bus cycles.

2. Testing performed at 3.5 MHz, however, the device is static by design and will typically operate below 1 Hz.

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