X88257

9

WR Controlled Write Cycle

Symbol

Parameter

Min.

Max.

Units

ALE Pulse Width

80

ns

Address Setup Time

20

ns

Address Hold Time

30

ns

Data Setup Time

50

ns

Data Hold Time

30

ns

Chip Enable Setup Time

7

ns

WR Pulse Width

120

ns

WR Setup Time

30

ns

WR Hold Time

20

ns

Byte Load Time (Page Write)

0.5

100

µs

Write Cycle Time

5

ms

6509 PGM T11

WR Controlled Write Timing Diagram

Note:

time the device requires to automatically complete the internal write operation.

ALE

A/D0–A/D7

A8–A14

WR

AIN

tDVWH

DIN

6509 ILL F07.1

tWHDX

tWRH

tWRH

tLHLL

tAVLL

tLLAX

tWRS

tWLWH

ADDRESS

CE

tELLL