Ac programming characteristics – Rainbow Electronics AT27LV520 User Manual

Page 8

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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

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