Rainbow Electronics AT28C256 - Manual (Page 5)

AT28C256
5
AC Read Waveforms
(1)(2)(3)(4)
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.
Input Test Waveforms and
Measurement Level Output Test Load
Note: 1. This parameter is characterized and is not 100% tested.
AC Read Characteristics
Symbol Parameter
AT28C256-15 AT28C256-20 AT28C256-25 AT28C256-35
Units Min Max Min Max Min Max Min Max
t
ACC
Address to Output Delay 150 200 250 350 ns
t
CE
(1) CE to Output Delay 150 200 250 350 ns
t
OE
(2) OE to Output Delay 0 70 0 80 0 100 0 100 ns
t
DF
(3)(4) CE or OE to Output Float 0 50 0 55 0 60 0 70 ns
t
OH
Output Hold from OE, CE or
Address, whichever occurred first
0 0 0 0 ns
t
R
, t
F
< 5 ns
Pin Capacitance
f = 1 MHz, T = 25°C (1)
Symbol Typ Max Units Conditions
C
IN
4 6 pF V
IN
= 0V
C
OUT
8 12 pF V
OUT
= 0V