M24C64-WMW6 데이터 시트보기 (PDF) - STMicroelectronics

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M24C64-WMW6

64/32 Kbit Serial IC Bus EEPROM

STMicroelectronics 

M24C64, M24C32

Figure 2A. DIP Connections

M24C64

M24C32

E0 1

E1 2

8 VCC

7 WC

E2 3

6 SCL

VSS 4

5 SDA

AI01845B

Figure 2B. SO and TSSOP Connections

E0

E1

E2

VSS

M24C64

M24C32

1

8

2

7

3

6

4

5

AI01846B

VCC

WC

SCL

SDA

These memory devices are compatible with the

I2C extended memory standard. This is a two wire

serial interface that uses a bi-directional data bus

and serial clock. The memory carries a built-in 4-

bit unique Device Type Identifier code (1010) in

accordance with the I2C bus definition.

The memory behaves as a slave device in the I2C

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 9th bit time,

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.

Power On Reset: VCC Lock-Out Write Protect

In order to prevent data corruption and inadvertent

write operations during power up, a Power On Re-

set (POR) circuit is included. The internal reset is

held active until the VCC voltage has reached the

POR threshold value, and all operations are dis-

abled – the device will not respond to any com-

mand. In the same way, when VCC drops from the

operating voltage, below the POR threshold value,

all operations are disabled and the device will not

respond to any command. A stable and valid VCC

must be applied before applying any logic signal.

SIGNAL DESCRIPTION

Serial Clock (SCL)

The SCL input pin is used to strobe all data in and

out of the memory. In applications where this line

is used by slaves to synchronize the bus to a slow-

Table 2. Absolute Maximum Ratings 1

Symbol

Parameter

Value

Unit

TA

Ambient Operating Temperature

-40 to 125

°C

TSTG

Storage Temperature

-65 to 150

°C

PSDIP8: 10 seconds

260

TLEAD

Lead Temperature during Soldering

SO8: 40 seconds

215

°C

TSSOP8: 40 seconds

215

VIO

Input or Output range

-0.6 to 6.5

V

VCC

Supply Voltage

-0.3 to 6.5

V

VESD

Electrostatic Discharge Voltage (Human Body model) 2

4000

V

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)

2/19

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