GMS90C320

32

OCT. 2000 Ver 1.2

AC Characteristics for 40MHz version

External Program Memory Characteristics

Parameter

Symbol

40 MHz Oscillator

Variable Oscillator

Unit

Min.

Max.

Min.

Max.

ALE pulse width

35

-

-

ns

Address setup to ALE

10

-

-

ns

Address hold after ALE

10

-

-

ns

ALE low to valid instruction in

-55

-

ns

ALE to PSEN

10

-

-

ns

PSEN pulse width

60

-

-

ns

PSEN to valid instruction in

-25

-

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 20 ns is permissible. This limited bus contention will not cause any damage

to port 0 Drivers.

-15

-

ns

Address valid after PSEN

20

-

ns

Address to valid instruction in

-65

-

ns

Address float to PSEN

-5

-

-5

-

ns