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AT29C257 Datasheet(PDF) 5 Page - ATMEL Corporation

Part No. AT29C257
Description  256K 32K x 8 5-volt Only CMOS Flash Memory
Download  12 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT29C257 Datasheet(HTML) 5 Page - ATMEL Corporation

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AC Read Characteristics
AT29C257-70
AT29C257-90
AT29C257-12
AT29C257-15
Symbol
Parameter
Min
Max
Min
Max
Min
Max
Min
Max
Units
tACC
Address to Output Delay
70
90
120
150
ns
tCE (1)
CE to Output Delay
70
90
120
150
ns
tOE (2)
OE to Output Delay
0
40
0
40
0
50
0
70
ns
tDF (3, 4)
CE or OE to Output Float
0
25
0
25
0
30
0
40
ns
tOH
Output Hold from OE, CE
or Address, whichever
occurred first
0000
ns
Notes: 1. CE may be delayed up to tACC - tCE after the address
transition without impact on tACC .
2. OE may be delayed up to tCE - tOE after the falling
edge of CE without impact on tCE or by tACC - tOE
after an address change without impact on tACC .
3. tDF is specified from OE or CE whichever occurs first
(CL = 5 pF).
4. This parameter is characterized and is not 100% tested.
AC Read Waveforms
(1, 2, 3, 4)
tR, tF < 5 ns
Input Test Waveforms and Measurement Level
Output Test Load
Pin Capacitance
(f = 1 MHz, T = 25°C)
(1)
Typ
Max
Units
Conditions
CIN
46
pF
VIN = 0V
COUT
812
pF
VOUT = 0V
Note:
1. This parameter is characterized and is not 100% tested.
AT29C257
4-109


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