Rainbow Electronics AT27LV520 - Manual (Page 5)

AT27LV520
5
Note: 3, 4, 5 — see AC Waveforms for Read Operation
AC Waveforms for Read Operation
(1)
Notes: 1. Timing measurement reference levels for all speed grades are V
OL
= 0.8V and V
OH
= 2.0V. Input AC drive levels are V
IL
=
0.45V and V
IH
= 2.4V.
2. OE/V
PP
may be delayed up to t
CE
- t
OE
after the address is valid without impact on t
CE
.
3. OE/V
PP
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.
AC Characteristics for Read Operation
V
CC
= 3.0V to 3.6V and 4.5V to 5.5V
Symbol Parameter Condition
AT27LV520-70 AT27LV520-90
Units Min Max Min Max
t
ACC
(3) Address to Output Delay ALE = OE/V
PP
= V
IL
70 90 ns
t
CE
Address Latch Enable Low to Output Delay Address Valid 55 70 ns
t
AS
Address Setup Time OE/V
PP
= V
IH
12 15 ns
t
AH
Address Hold Time OE/V
PP
= V
IH
12 15 ns
t
ALE
Address Latch Enable Width OE/V
PP
= V
IH
40 45 ns
t
OE
(3) OE/V
PP
to Output Delay ALE = V
IL
30 35 ns
t
DF
(4)(5) OE/V
PP
High to Output Float ALE = V
IL
25 25 ns
t
OH
Output Hold from Address or OE/V
PP
,
whichever occurred first
ALE = V
IL
7 0 ns
ALE
OE/V PP
AD7 - AD0
A15 - A8
tALE
ADDRESS IN
tAS tAH
DATA OUT
tOE
tACC
tDF
tOH
tCE