M24256-B, M24128-B

2/19

The memory behaves as a slave device in the I

protocol, with all memory operations synchronized

by the serial clock. Read and Write operations are

initiated by a START condition, generated by the

bus master. The START condition is followed by a

Device Select Code and RW bit (as described in

Table 3), terminated by an acknowledge bit.

When writing data to the memory, the memory in-

serts an acknowledge bit during the 9

following the bus master’s 8-bit transmission.

When data is read by the bus master, the bus

master acknowledges the receipt of the data byte

in the same way. Data transfers are terminated by

a STOP condition after an Ack for WRITE, and af-

ter a NoAck for READ.

In order to prevent data corruption and inadvertent

write operations during power up, a Power On Re-

Figure 2A. PSDIP8 Connections

Figure 2B. SO8 and TSSOP8 Connections

SDA

VSS

SCL

WC

E1

E0

VCC

E2

AI02810

M24256-B

M24128-B

1

2

3

4

8

7

6

5

1

AI02811

2

3

4

8

7

6

5

SDA

VSS

SCL

WC

E1

E0

VCC

E2

M24256-B

M24128-B

Figure 2C. TSSOP14 Connections

Note: 1. NC = Not Connected

1

AI02812

2

3

4

14

9

10

8

SDA

VSS

E2

SCL

E0

WC

M24256-B

M24128-B

NC

E1

NC

NC

NC

NC

NC

5

6

7

12

13

11

VCC

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 ST SURE Program and other relevant quality documents.

2. MIL-STD-883C, 3015.7 (100 pF, 1500

Ω)

Symbol

Parameter

Value

Unit

Ambient Operating Temperature

-40 to 125

°C

Storage Temperature

-65 to 150

°C

Lead Temperature during Soldering

PSDIP8: 10 seconds

SO8: 40 seconds

TSSOP8: 40 seconds

TSSOP14: 40 seconds

260

215

215

215

°C

Input or Output range

-0.6 to 6.5

V

Supply Voltage

-0.3 to 6.5

V

4000

V