M69AW048B

18/29

Table 12. Write Mode AC Characteristics

Note: 1. Maximum value is applicable if E1 is kept Low without any address change. If needed by system operation, please contact your

local ST representative for relaxation of the 1000ns limitation.

2. Minimum value must be equal to or greater than the sum of write pulse (

3. Write pulse is defined from the falling edge of E1, W, or LB/UB, whichever occurs last.

4. Write recovery is defined from Write pulse is defined from the rising edge of E1, W, or LB/UB, whichever occurs first.

5. Applicable to any address change when E1 stays Low.

Low. Once the read cycle is initiated, new write pulse should be input after minimum Read Cycle Time is met.

7. If G is Low after new address input, the read cycle is initiated. In other words, G must be brought High at the same time or before

new address valid. Once the read cycle is initiated, new write pulse should be input after minimum Read Cycle Time is met.

Symbol

Alt.

Parameter

M69AW048B

Unit

Min

Max

(1,2)

Write Cycle Time

70

1000

ns

(2)

Address Valid to LB, UB Low

0

ns

(2)

Address Valid to Chip Enable Low

0

ns

(2)

Address Valid to Write Enable Low

0

ns

(5)

Address Invalid Time for Write

10

ns

(4)

LB, UB High to Address Transition

15

1000

ns

LB, UB High to Input High-Z

0

ns

(3)

LB, UB Low to LB, UB High

45

ns

LB, UB Low to LB, UB High for Page Access

20

ns

(3)

LB, UB Low to Write Enable High

45

ns

Input Valid to LB, UB High

20

ns

Input Valid to Chip Enable High

20

ns

Input Valid to Write Enable High

20

ns

(4)

Chip Enable High to Address Transition

15

ns

Chip Enable High to Input High-Z

0

ns

Chip Enable High to Chip Enable Low

15

ns

(1,2)

Write Cycle Time

70

1000

ns

(3)

Chip Enable Low to Chip Enable High

45

ns

(7)

Output Enable High to Address Valid

0

ns

(6)

Output Enable High to Chip Enable Low

–5

ns

(4)

Output Enable High to Output Hi-Z

20

ns

(4)

Write Enable High to Address Transition

15

1000

ns

Write Enable High to Input High-Z

0

ns

(3)

Write Enable Low to LB, UB High

45

ns

(3)

Write Enable Low to Write Enable High

45

ns