XM28C040

12

Write Cycle Limits

WE Controlled Write

Symbol

Parameter

Min.

Max.

Min.

Max.

Units

Write Cycle Time

10

10

ms

Address Setup Time

0

0

ns

Address Hold Time

125

125

ns

Write Setup Time

25

0

ns

Write Hold Time

0

25

ns

CE Pulse Width

125

100

ns

OE High Setup Time

10

10

ns

OE High Hold Time

10

35

ns

WE Pulse Width

100

125

ns

WE High Recovery

100

100

ns

Data Valid

1

1

µs

Data Setup

50

50

ns

Data Hold

10

35

ns

Delay to Next Write

10

10

µs

Byte Load Cycle

0.3

100

0.3

100

µs

3873 PGM T08.1

WE Controlled Write Cycle

3873 FHD F04

Note:

(4) Due to the inclusion of the decoder IC on board the module the

WE and CE write controlled timings will vary. When utilizing the

CE controlled write operation all the hold timings must be extended by the worst case propagation delay of the decoder. For a

WE controlled write operation CE must be a minimum 125ns to accommodate the additional setup time required.

ADDRESS

tAS

tWC

tAH

tOES

tDV

tDS

tOEH

CE

WE

OE

DATA IN

DATA OUT

HIGH Z

DATA VALID

tCS

tCH

tWP

tWPH

tDH