6
0547G–EPROM–12/07
AT27LV256A
10. AC Waveforms for Read Operation
(1)
Notes: 1. Timing measurement references are 0.8V and 2.0V. Input AC drive levels are 0.45V and 2.4V, unless otherwise specified.
2. OE
may be delayed up to t
CE
- t
OE
after the falling edge of CE without impact on t
CE
.
3. OE may be delayed up to t
ACC
- t
OE
after the address is valid without impact on t
ACC
.
4. This parameter is only sampled and is not 100% tested.
5. Output float is defined as the point when data is no longer driven.
9. AC Characteristics for Read Operation
V
CC
= 3.0V to 3.6V and 4.5V to 5.5V
Symbol Parameter Condition
AT27LV256A
Units
-55 -90
Max Min Min Max
t
ACC
(3)
Address to Output Delay CE = OE = V
IL
55 90 ns
t
CE
(2)
CE to Output Delay OE = V
IL
55 90 ns
t
OE
(2)(3)
OE to Output Delay CE = V
IL
35 50 ns
t
DF
(4)(5)
OE or CE High to Output Float,
Whichever Occurred First
30 40 ns
t
OH
Output Hold from Address, CE or OE,
Whichever Occurred First
00ns
