AT27BV256 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
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AT27BV256 Datasheet PDF : 9 Pages
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AT27BV256
AC Characteristics for Read Operation (VCC = 2.7V to 3.6V and 4.5V to 5.5V)
AT27BV256
-70
-90
-12
-15
Symbol
tACC (3)
tCE (2)
tOE (2, 3)
tDF (4, 5)
tOH
Parameter
Address to Output Delay
CE to Output Delay
OE to Output Delay
OE or CE High to Output Float,
whichever occurred first
Output Hold from Address, CE or OE,
whichever occurred first
Condition
CE = OE = VIL
OE = VIL
CE = VIL
Min Max Min Max Min Max Min Max Units
70
90
120
150 ns
70
90
120
150 ns
50
50
50
60 ns
40
40
40
50 ns
0
0
0
0
ns
Notes: 2, 3, 4, 5. - see AC Waveforms for Read Operation.
AC Waveforms for Read Operation (1)
Notes: 1. Timing measurement references are 0.8V and 2.0V.
Input AC drive levels are 0.45V and 2.4V, unless oth-
erwise specified.
2. OE may be delayed up to tCE-tOE after the falling
edge of CE without impact on tCE.
3. OE may be delayed up to tACC-tOE after the address
is valid without impact on tACC.
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.
6. When reading a 27BV256, a 0.1 µF capacitor is required
across VCC and ground to supress spurious voltage tran-
sients.
3-7
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