
16. AC Programming Characteristics
T A = 25 ± 5 ° C, V CC = 6.5 ± 0.25V, OE/V PP = 13.0 ± 0.25V
Limits
Symbol
t ALE
t LAS
t LAH
t LP
t OES
t OEH
t DS
t DH
t PW
t VR
t VCS
t OE
Parameter (1)
Address Latch Enable Width
Latched Address Setup Time
Latched Address Hold Time
ALE Low to OE/V PP High Voltage Delay
OE/V PP Setup Time
OE/V PP Hold Time
Data Setup Time
Data Hold Time
ALE Program Pulse Width (2)
OE/V PP Recovery Time
V CC Setup Time
Data Valid from OE/V PP
Test Conditions
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:
Min
500
100
100
2
2
2
2
2
47.5
2
2
Max
52.5
150
Units
ns
ns
ns
μs
μs
μs
μs
μs
μs
μs
μs
ns
t DFP
OE/V PP High to Output Float Delay
(3)
0.8V to 2.0V
0
130
ns
t AS
t AH
t PRT
Address Setup Time
Address Hold Time
OE/V PP Pulse Rise Time During
Programming
2
0
50
μs
μs
ns
Notes:
1. V CC must be applied simultaneously or before OE/V PP and removed simultaneously or after OE/V PP .
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.
17. Atmel’s AT27LV520 Integrated Product Identification Code
Pins
Hex
Codes
Manufacturer
Device Type
A8
0
1
AD7
0
1
AD6
0
0
AD5
0
0
AD4
1
1
AD3
1
1
AD2
1
1
AD1
1
0
AD0
0
1
Data
1E
9D
Note:
8
1. The AT27LV520 has the same product identification code as the AT27C520. Both are programming compatible.
AT27LV520
0911G–EPROM–8/07