Ac programming characteristics – Rainbow Electronics AT27LV520 User Manual
Page 8
AT27LV520
8
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.
Note:
1. The AT27LV520 has the same product identification code as the AT27C520. Both are programming compatible.
AC Programming Characteristics
T
A
= 25
± 5°C, V
CC
= 6.5
± 0.25V, OE/V
PP
= 13.0
± 0.25V
Symbol
Parameter
Test Conditions
Limits
Units
Min
Max
t
ALE
Address Latch Enable Width
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
500
ns
t
LAS
Latched Address Setup Time
100
ns
t
LAH
Latched Address Hold Time
100
ns
t
LP
ALE Low to OE/V
PP
High Voltage Delay
2
µs
t
OES
OE/V
PP
Setup Time
2
µs
t
OEH
OE/V
PP
Hold Time
2
µs
t
DS
Data Setup Time
2
µs
t
DH
Data Hold Time
2
µs
t
PW
ALE Program Pulse Width
47.5
52.5
µs
t
VR
OE/V
PP
Recovery Time
2
µs
t
VCS
V
CC
Setup Time
2
µs
t
OE
Data Valid from OE/V
PP
150
ns
t
DFP
OE/V
PP
High to Output Float Delay
(3)
0
130
ns
t
AS
Address Setup Time
2
µs
t
AH
Address Hold Time
0
µs
t
PRT
OE/V
PP
Pulse Rise Time During
Programming
50
ns
Atmel’s 27LV520 Integrated Product Identification Code
Codes
Pins
Hex
Data
A8
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
Manufacturer
0
0
0
0
1
1
1
1
0
1E
Device Type
1
1
0
0
1
1
1
0
1
9D