Ac read characteristics, Ac read waveforms, F = 1 mhz, t = 25°c) – Rainbow Electronics AT29C257 User Manual
Page 5
AC Read Characteristics
AT29C257-70
AT29C257-90
AT29C257-12
AT29C257-15
Symbol
Parameter
Min
Max
Min
Max
Min
Max
Min
Max
Units
t
ACC
Address to Output Delay
70
90
120
150
ns
t
CE
(1)
CE to Output Delay
70
90
120
150
ns
t
OE
(2)
OE to Output Delay
0
40
0
40
0
50
0
70
ns
t
DF
(3, 4)
CE or OE to Output Float
0
25
0
25
0
30
0
40
ns
t
OH
Output Hold from OE, CE
or Address, whichever
occurred first
0
0
0
0
ns
Notes: 1. CE may be delayed up to t
ACC
- t
CE
after the address
transition without impact on t
ACC
.
2. OE may be delayed up to t
CE
- t
OE
after the falling
edge of CE without impact on t
CE
or by t
ACC
- t
OE
after an address change without impact on t
ACC
.
3. t
DF
is specified from OE or CE whichever occurs first
(C
L
= 5 pF).
4. This parameter is characterized and is not 100% tested.
AC Read Waveforms
(1, 2, 3, 4)
t
R
, t
F
< 5 ns
Input Test Waveforms and Measurement Level
Output Test Load
Pin Capacitance
(f = 1 MHz, T = 25°C)
(1)
Typ
Max
Units
Conditions
C
IN
4
6
pF
V
IN
= 0V
C
OUT
8
12
pF
V
OUT
= 0V
Note:
1. This parameter is characterized and is not 100% tested.
AT29C257
4-109