M69AR048B View Datasheet(PDF) - STMicroelectronics
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M69AR048B Datasheet PDF : 29 Pages
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M69AR048B
Table 12. Write Mode AC Characteristics
M69AR048B
Symbol Alt.
Parameter
80
85
Unit
Min Max Min Max
tAVAX (1,2)
tWC Write Cycle Time
80 1000 85 1000 ns
tAVBL (2)
tAS Address Valid to LB, UB Low
0
0
ns
tAVEL (2)
tAS Address Valid to Chip Enable Low
0
0
ns
tAVWL (2)
tAS Address Valid to Write Enable Low
0
0
ns
tAXAV (5)
tAXW Address Invalid Time for Write
10
10
ns
tBHAX (4)
tBR LB, UB High to Address Transition
15 1000 15 1000 ns
tBHDZ
tDH LB, UB High to Input High-Z
0
0
ns
tBLBH (3)
tBW LB, UB Low to LB, UB High
45
50
ns
tBLBH2
tBWO LB, UB Low to LB, UB High for Page Access
20
20
ns
tBLWH (3)
tBW LB, UB Low to Write Enable High
45
50
ns
tDVBH
tDS Input Valid to LB, UB High
20
20
ns
tDVEH
tDS Input Valid to Chip Enable High
20
20
ns
tDVWH
tDS Input Valid to Write Enable High
20
20
ns
tEHAX (4) tWRC Chip Enable High to Address Transition
15
15
ns
tEHDZ
tDH Chip Enable High to Input High-Z
0
0
ns
tEHEL
tCP Chip Enable High to Chip Enable Low
15
15
ns
tELAX (1,2)
tWC Write Cycle Time
80 1000 85 1000 ns
tELEH (3)
tCW Chip Enable Low to Chip Enable High
45
50
ns
tGHAV (7)
tOES Output Enable High to Address Valid
0
0
ns
tGHEL (6) tOHCL Output Enable High to Chip Enable Low
–5
–5
ns
tWHAX (4)
tWR Write Enable High to Address Transition
15 1000 15 1000 ns
tWHDZ
tDH Write Enable High to Input High-Z
0
0
ns
tWLBH (3)
tWP Write Enable Low to LB, UB High
45
50
ns
tWLWH (3)
tWP Write Enable Low to Write Enable High
45
50
ns
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 (tCW, tWP or tBW) and write recovery time (tWRC, tWR or
tBR).
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.
6. If G is Low after minimum tGHEL, the read cycle is initiated. In other words, G must be brought High within 5ns after E1 is brought
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.
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