X24257V14-2.5 datasheet(9/19 Pages) XICOR

Part #	X24257V14-2.5

Description	400kHz 2-Wire Serial EEPROM with Block Lock

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Manufacturer	XICOR [Xicor Inc.]

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9 / 19 page

X24257 – Preliminary Information

Characteristics subject to change without notice.

9 of 19

REV 1.1.1 10/15/00

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the WEL bit and zeros to the other bits of the control

register) or until the part powers up again. Writes to

WEL bit do not cause a high voltage write cycle, so the

device is ready for the next operation immediately after

the stop condition.

BP2, BP1, BP0: Block Protect Bits (Nonvolatile)

The Block Protect Bits, BP2, BP1 and BP0, determine

which blocks of the array are write protected. A write to

a protected block of memory is ignored. The block pro-

tect bits will prevent write operations to one of eight

segments of the array. The partitions are described in

Table 2.

Table 2. Block Protect Bits

Figure 11. Block Protection Configuration

BP2

BP1

BP0

Protected Addresses

Array Lock

00

0

None

00

1

6000h - 7FFFh (8K bytes)

Upper 1/4 (Q4)

01

0

4000h - 7FFFh (16K bytes)

Upper 1/2 (Q3, Q4)

01

1

0000h - 7FFFh (32K bytes)

Full Array (All)

10

0

0000h - 003Fh (64 bytes)

First Page (P1)

10

1

0000h - 007Fh (128 bytes)

First 2 pgs (P2)

11

0

0000h - 00FFh (256 bytes)

First 4 pgs (P4)

11

1

0000h - 01FFh (512 bytes)

First 8 pgs (P8)

BP2–

BP0

000

001

010

011

100

101

110

111

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