AT27C256R-70RA Просмотр технического описания (PDF) - Atmel Corporation
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AT27C256R-70RA Datasheet PDF : 15 Pages
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16. AC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V
Symbol Parameter
Test Conditions(1)
Limits
Min
Max
Units
tAS
tOES
tDS
tAH
tDH
tDFP
tVPS
tVCS
tPW
tOE
tPRT
Notes:
Address Setup Time
2
µs
OE Setup Time
Data Setup Time
Input Rise and Fall Times
2
µs
(10% to 90%) 20 ns
2
µs
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)
0
Input Pulse Levels
0.45V to 2.4V
2
0
Input Timing Reference Level
2
0.8V to 2.0V
2
µs
µs
130
ns
µs
µs
Output Timing Reference Level
95
105
µs
0.8V to 2.0V
150
ns
VPP Pulse Rise Time During Programming
50
ns
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%.
17. Atmel’s AT27C256R Integrated Product Identification Code
Codes
Manufacturer
Device Type
Pins
Hex
A0
O7
O6
O5
O4
O3
O2
O1
O0
Data
0
0
0
0
1
1
1
1
0
1E
1
1
0
0
0
1
1
0
0
8C
8 AT27C256R
0014M–EPROM–12/07
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