M24C64-RBN6T datasheet(4/26 Pages) STMICROELECTRONICS

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M24C64, M24C32

4/26

SUMMARY DESCRIPTION

These I2C-compatible electrically erasable pro-

grammable memory (EEPROM) devices are orga-

nized as 8192 x 8 bits (M24C64) and 4096 x 8 bits

(M24C32).

Figure 2. Logic Diagram

I2C uses a two-wire serial interface, comprising a

bi-directional data line and a clock line. The devic-

es carry a built-in 4-bit Device Type Identifier code

(1010) in accordance with the I2C bus definition.

The device behaves as a slave in the I2C protocol,

with all memory operations synchronized by the

serial clock. Read and Write operations are initiat-

ed by a Start condition, generated by the bus mas-

ter. The Start condition is followed by a Device

Select Code and Read/Write bit (RW) (as de-

scribed in Table 3.), terminated by an acknowl-

edge bit.

When writing data to the memory, the device 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 after a

NoAck for Read.

Table 2. Signal Names

Power On Reset: VCC Lock-Out Write Protect

In order to prevent data corruption and inadvertent

Write operations during Power-up, a Power On

Reset (POR) circuit is included. At Power-up, the

internal reset is held active until VCC has reached

the Power On Reset (POR) threshold voltage, and

all operations are disabled – the device will not re-

spond to any command. In the same way, when

VCC drops from the operating voltage, below the

Power On Reset (POR) threshold voltage, all op-

erations are disabled and the device will not re-

spond to any command.

A stable and valid VCC (as defined in Table 9. and

Table 10.) must be applied before applying any

logic signal.

Figure 3. DIP, SO, TSSOP and UFDFPN

Connections

Note: See PACKAGE MECHANICAL section for package dimen-

sions, and how to identify pin-1.

AI01844B

E0-E2

SDA

VCC

M24C64

M24C32

SCL

VSS

E0, E1, E2

Chip Enable

SDA

Serial Data

SCL

Serial Clock

Write Control

VCC

Supply Voltage

VSS

Ground

SDA

VSS

SCL

VCC

AI01845C

M24C64

M24C32

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