16. AC Asynchronous Read Timing Characteristics
Symbol
t
RC
t
ACC
t
CE
t
OE
t
DF
t
OH
t
RO
Parameter
Read Cycle Time
Access, Address to Data Valid
Access, CE to Data Valid
OE to Data Valid
CE, OE High to Data Float
Output Hold from OE, CE or Address, whichever Occurs First
RESET to Output Delay
0
150
Min
70
70
70
20
25
Max
Units
ns
ns
ns
ns
ns
ns
ns
17. Asynchronous Read Cycle Waveform
(1)(2)(3)
t
RC
A0 - A21
ADDRESS VALID
CE
t
CE
OE
t
OE
t
DF
t
ACC
t
RO
HIGH Z
OUTPUT
VALID
t
OH
RESET
I/O0 - I/O15
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 (CL = 5 pF).
20
AT49BV6416(T)
3451C鈥揊LASH鈥?/05