9. AC Read Characteristics
AT28C256-15
AT28C256-20
AT28C256-25
AT28C256-35
Symbol
Parameter
Min
Max
150
150
70
Min
Max
200
200
80
Min
Max
250
250
100
60
Min
Max
350
350
100
70
Units
ns
tACC
Address to Output Delay
CE to Output Delay
OE to Output Delay
CE or OE to Output Float
(1)
tCE
ns
(2)
tOE
0
0
0
0
0
0
0
0
ns
(3)(4)
tDF
50
55
ns
Output Hold from OE, CE or
Address, whichever occurred first
tOH
0
0
0
0
ns
10. AC Read Waveforms(1)(2)(3)(4)
Notes: 1. CE may be delayed up to tACC - tCE after the address transition without impact on tACC
2. OE may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE or by tACC - tOE after an address change
without impact on tACC
.
.
3. tDF is specified from OE or CE whichever occurs first (CL = 5 pF).
4. This parameter is characterized and is not 100% tested.
6
AT28C256
0006M–PEEPR–12/09
ATMEL [ ATMEL ]
