Instruction Manual

AT27C516
5
AC Waveforms for Read Operation
(1)
Notes: 1. Timing measurement reference level is 1.5V for -45 and -55 devices. Input AC drive levels are V
IL
= 0.0V and V
IH
= 3.0V.
Timing measurement reference levels for all other 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 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.
AC Characteristics for Read Operation
Symbol Parameter Condition
AT27C516
Units
-45 -55 -70 -85 -10
Min Max Min Max Min Max Min Max Min Max
t
ACC
(3)
Address to Output
Delay
CE = OE = V
IL
45 55 70 85 100 ns
t
CE
(2)
CE to Output
Delay
OE
= V
IL
45 55 70 85 100 ns
t
OE
(2)(3)
OE to Output
Delay
CE
= V
IL
20 25 25 30 30 ns
t
DF
(4)(5)
OE or CE High to Output Float,
whichever occurred first
20 25 25 30 30 ns
t
OH
Output Hold from Address, CE or OE,
whichever occurred first
77700ns