GMS90C320

26

OCT. 2000 Ver 1.2

AC Characteristics for 12MHz version

External Program Memory Characteristics

Variable clock:

Parameter

Symbol

12 MHz Oscillator

Variable Oscillator

Unit

Min.

Max.

Min.

Max.

ALE pulse width

127

-

-

ns

Address setup to ALE

43

-

-

ns

Address hold after ALE

43

-

-

ns

ALE low to valid instruction in

-233

-

ns

ALE to PSEN

58

-

-

ns

PSEN pulse width

215

-

-

ns

PSEN to valid instruction in

-150

-

ns

Input instruction hold after PSEN

0-

0

-

ns

Input instruction float after PSEN

1)

Interfacing the GMS90C320 to devices with float times up to 75 ns is permissible. This limited bus contention will not cause any damage

to port 0 Drivers.

-63

-

ns

Address valid after PSEN

75

-

-

ns

Address to valid instruction in

-302

-

ns

Address float to PSEN

-10

-

-10

-

ns