AT27LV256A-12JC_ Ver la hoja de datos (PDF) - Atmel Corporation
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Fabricante
AT27LV256A-12JC_ Datasheet PDF : 9 Pages
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AC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V
Sym-
bol Parameter
Test
Conditions* (1)
tAS
tOES
tDS
tAH
tDH
tDFP
tVPS
tVCS
tPW
tOE
tPRT
Address Setup Time
OE Setup Time
Data Setup Time
Address Hold Time
Data Hold Time
OE High to
Output Float Delay (2)
VPP Setup Time
VCC Setup Time
CE Program Pulse Width (3)
Data Valid from OE (2)
VPP Pulse Rise Time
During Programming
Limits
Min Max Units
2
µs
2
µs
2
µs
0
µs
2
µs
0 130 ns
2
µs
2
µs
95 105 µs
150 ns
50
ns
*AC Conditions of Test:
Input Rise and Fall Times (10% to 90%)...........20 ns
Input Pulse Levels................................0.45V to 2.4V
Input Timing Reference Level...............0.8V to 2.0V
Output Timing Reference Level............0.8V to 2.0V
Notes: 1. VCC must be applied simultaneously or before VPP
and removed simultaneously or after VPP.
2. This parameter is only sampled and is not 100%
tested. Output Float is defined as the point where
data is no longer driven —see timing diagram.
3. Program Pulse width tolerance is 100 µsec ± 5%.
Rapid Programming Algorithm
A 100 µs CE pulse width is used to program. The address
is set to the first location. VCC is raised to 6.5V and VPP is
raised to 13.0V. Each address is first programmed with
one 100 µs CE pulse without verification. Then a verifica-
tion / reprogramming loop is executed for each address.
In the event a byte fails to pass verification, up to 10 suc-
cessive 100 µs pulses are applied with a verification after
each pulse. If the byte fails to verify after 10 pulses have
been applied, the part is considered failed. After the byte
verifies properly, the next address is selected until all have
been checked. VPP is then lowered to 5.0V and VCC to
5.0V. All bytes are read again and compared with the
original data to determine if the device passes or fails.
Atmel’s 27LV256A Integrated
Product Identification Code (1)
Codes
Pins
Hex
A0 O7 O6 O5 O4 O3 O2 O1 O0 Data
Manufacturer 0 0 0 0 1 1 1 1 0 1E
Device Type 1 1 0 0 0 1 1 0 0 8C
Note: 1. The AT27LV256A has the same Product Identification
Code as the AT27C256R. Both are programming
compatible.
3-82
AT27LV256A
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