AT27LV020A

8

AC Programming Characteristics

*AC Conditions of Test:

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

Notes:

2. 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.

3. Program Pulse width tolerance is 100

Atmel's 27LV020A Integrated

Note:

1. The AT27LV020A has the same Product Identification

Code as the AT27C020. Both are programming com-

patible.

Rapid Programming Algorithm

A 100

µs PGM pulse width is used to program. The

with one 100

µs PGM pulse without verification. Then a

verification/reprogramming loop is executed for each

address. In the event a byte fails to pass verification, up to

10 successive 100

µs pulses are applied with a verification

after each pulse. If the byte fails to verify after 10 pulses

have been applied, the part is considered failed. After the

byte verifies properly, the next address is selected until all

to 5.0V. All bytes are read again and compared with the

original data to determine if the device passes or fails.

Symbol Parameter

Test

Limits

Units

Min

Max

Address Setup Time

2

CE Setup Time

2

OE Setup Time

2

Data Setup Time

2

Address Hold Time

0

Data Hold Time

2

OE High to Output

Float Delay

0

130

ns

2

2

PGM Program Pulse Width

95

105

Data Valid from OE

150

ns

During Programming

50

ns

Codes

Pins

Hex

Data

A0

O7

O6

O5

O4

O3

O2

O1

O0

Manufacturer

0

0

001111

0

1E

Device Type

1

1

000011

0

86