GMS90C320

30

OCT. 2000 Ver 1.2

AC Characteristics for 24MHz version

External Program Memory Characteristics

Variable clock:

Parameter

Symbol

24 MHz Oscillator

Variable Oscillator

Unit

Min.

Max.

Min.

Max.

ALE pulse width

43

-

-

ns

Address setup to ALE

17

-

-

ns

Address hold after ALE

17

-

-

ns

ALE low to valid instruction in

-80

-

ns

ALE to PSEN

22

-

-

ns

PSEN pulse width

95

-

-

ns

PSEN to valid instruction in

-60

-

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 35 ns is permissible. This limited bus contention will not cause

any damage to port 0 Drivers.

-32

-

ns

Address valid after PSEN

37

-

-

ns

Address to valid instruction in

-148

-

ns

Address float to PSEN

-10

-

-10

-

ns