AT27C520 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
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AT27C520 Datasheet PDF : 10 Pages
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AT27C520
AC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, OE/VPP = 13.0 ± 0.25V
Limits
Symbol Parameter(1)
Test Conditions
Min Max Units
tALE
tLAS
tLAH
tLP
tOES
tOEH
tDS
tDH
tPW
tVR
tVCS
tOE
tDFP
tAS
tAH
tPRT
Notes:
Address Latch Enable Width
500
ns
Latched Address Setup Time
100
ns
Latched Address Hold Time
100
ns
ALE Low to OE/VPP High Voltage Delay
OE/VPP Setup Time
OE/VPP Hold Time
Data Setup Time
Data Hold Time
ALE Program Pulse Width(2)
OE/VPP Recovery Time
VCC Setup Time
Data Valid from OE/VPP
OE/VPP High to Output Float Delay(3)
Address Setup Time
2
µs
Input Rise and Fall Times
2
µs
(10% to 90%) 20 ns
2
µs
Input Pulse Levels
2
µs
0.45V to 2.4V 2
µs
Input Timing Reference Level
47.5 52.5 µs
0.8V to 2.0V 2
µs
2
µs
Output Timing Reference Level
0.8V to 2.0V
150
ns
0
130
ns
2
µs
Address Hold Time
0
µs
OE/VPP Pulse Rise Time During Programming
50
ns
1. VCC must be applied simultaneously or before OE/VPP and removed simultaneously or after OE/VPP.
2. Program Pulse width tolerance is 50 µsec ± 5%.
3. 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.
Atmel’s 27C520 Integrated Product Identification Code
Codes
Manufacturer
Device Type
Pins
Hex
A8
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
Data
0
0
0
0
1
1
1
1
0
1E
1
1
0
0
1
1
1
0
1
9D
7
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