Rainbow Electronics AT27LV520 - 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 (1) 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 (2) 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