EM39LV040

4M (512Kx8) Bits Flash Memory

SPECIFICATION

Hardware Data Protection

Noise/Glitch Protection:

A WE# or CE# pulse of less than 5 ns will not initiate a

write cycle.

1.5V.

Write Inhibit Mode:

Forcing OE# Low, CE# High, or WE# High will inhibit the

Write operation. This prevents inadvertent write during

power-up or power-down.

Software Data Protection (SDP)

The EM39LV040 provides the JEDEC approved Software Data Protection (SDP) scheme for

Program and Erase operations. Any Program operation requires the inclusion of the

three-byte sequence. The three-byte load sequence is used to initiate the Program operation,

providing optimal protection from inadvertent Write operations, especially during the system

power-up or power-down transition. Any Erase operation requires the inclusion of six-byte

sequence. See Table 3 below for the specific software command codes. During SDP

Software Command Sequence

1st Bus

Write Cycle

2nd Bus

Write Cycle

3rd Bus

Write Cycle

4th Bus

Write Cycle

5th Bus

Write Cycle

6th Bus

Write Cycle

Command

Sequence

Addr

1

Data

Addr

1

Data

Addr

1

Data

Addr

1

Data

Addr

1

Data

Addr

1

Data

Byte Program

5555H

AAH

2AAAH

55H

5555H

A0H

BA

2

Data

Sector Erase

5555H

AAH

2AAAH

55H

5555H

80H

5555H

AAH

2AAAH

55H

3

30H

Chip Erase

5555H

AAH

2AAAH

55H

5555H

80H

5555H

AAH

2AAAH

55H

5555H

10H

Software ID

Entry

4

5555H

AAH

2AAAH

55H

5555H

90H

Manufacture ID

5555H

AAH

2AAAH

55H

5555H

90H

0000H

7FH

Manufacture ID

5555H

AAH

2AAAH

55H

5555H

90H

0003H

7FH

Manufacture ID

5555H

AAH

2AAAH

55H

5555H

90H

0040H

1FH

Device ID

5555H

AAH

2AAAH

55H

5555H

90H

0001H

29FH

Software ID Exit

5

XXH

F0H

Software ID Exit

5

5555H

AAH

2AAAH

55H

5555H

F0H

Notes:

2. BA = Program byte address.

4. The device does not remain in Software Product ID mode if powered down (see Figure 9 for more information).

5. Both Software ID Exit operations are equivalent.

Table 3: Software Command Sequence

This specification is subject to change without further notice. (07.22.2004 V1.0)

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