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M29W400BT, M29W400BB

Chip Enable, Output Enable and Write Enable sig-

nals control the bus operation of the memory.

They allow simple connection to most micropro-

cessors, often without additional logic.

The memory is offered in TSOP48 (12 x 20mm)

and SO44 packages and it is supplied with all the

bits erased (set to ’1’).

The blocks in the memory are asymmetrically ar-

ranged, see Tables 3 and 4, Block Addresses. The

first or last 64 Kbytes have been divided into four

additional blocks. The 16 Kbyte Boot Block can be

used for small initialization code to start the micro-

processor, the two 8 Kbyte Parameter Blocks can

be used for parameter storage and the remaining

32K is a small Main Block where the application

may be stored.

Note: 1. Except for the rating ”Operating Temperature Range”, stresses above those listed in the Table ”Absolute Maximum Ratings” may

cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions

above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating condi-

tions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant qual-

ity documents.

2. Minimum Voltage may undershoot to –2V during transition and for less than 20ns during transitions.

Symbol

Parameter

Value

Unit

Ambient Operating Temperature (Temperature Range Option 1)

0 to 70

°C

Ambient Operating Temperature (Temperature Range Option 6)

–40 to 85

°C

Temperature Under Bias

–50 to 125

°C

Storage Temperature

–65 to 150

°C

(2)

Input or Output Voltage

–0.6 to 4

V

Supply Voltage

–0.6 to 4

V

Identification Voltage

–0.6 to 13.5

V

Table 3. Top Boot Block Addresses

M29W400BT

#

Size

(Kbytes)

Address Range

(x8)

Address Range

(x16)

10

16

7C000h-7FFFFh

3E000h-3FFFFh

9

8

7A000h-7BFFFh

3D000h-3DFFFh

8

8

78000h-79FFFh

3C000h-3CFFFh

7

32

70000h-77FFFh

38000h-3BFFF h

6

64

60000h-6FFFFh

30000h-37FFFh

5

64

50000h-5FFFFh

28000h-2FFFFh

4

64

40000h-4FFFFh

20000h-27FFFh

3

64

30000h-3FFFFh

18000h-1FFFFh

2

64

20000h-2FFFFh

10000h-17FFFh

1

64

10000h-1FFFFh

08000h-0FFFFh

0

64

00000h-0FFFFh

00000h-07FFFh

Table 4. Bottom Boot Block Addresses

M29W400BB

#

Size

(Kbytes)

Address Range

(x8)

Address Range

(x16)

10

64

70000h-7FFFFh

38000h-3FFFF h

9

64

60000h-6FFFFh

30000h-37FFFh

8

64

50000h-5FFFFh

28000h-2FFFF h

7

64

40000h-4FFFFh

20000h-27FFFh

6

64

30000h-3FFFFh

18000h-1FFFF h

5

64

20000h-2FFFFh

10000h-17FFFh

4

64

10000h-1FFFFh

08000h-0FFFF h

3

32

08000h-0FFFFh

04000h-07FFFh

2

8

06000h-07FFFh

03000h-03FFFh

1

8

04000h-05FFFh

02000h-02FFFh

0

16

00000h-03FFFh

00000h-01FFFh