M34F04 datasheet(4/20 Pages) STMICROELECTRONICS

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M34F04

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SUMMARY DESCRIPTION

The

M34F04

electrically

erasable

programmable memory (EEPROM), organized as

512 x 8.

Figure 2. Logic Diagram

These devices are compatible with the I2C memo-

ry protocol. This is a two wire serial interface that

uses a bi-directional data bus and serial clock. The

devices carry a built-in 4-bit Device Type Identifier

code (1010) in accordance with the I2C bus defini-

tion.

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 RW bit (as described in Table 2),

terminated by an acknowledge 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 1. 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. The internal reset

is held active until VCC has reached the POR

threshold value, and all operations are disabled –

the device will not respond to any command. In the

same way, when VCC drops from the operating

voltage, below the POR threshold value, all oper-

ations are disabled and the device will not respond

to any command. A stable and valid VCC must be

applied before applying any logic signal.

Figure 3. SO Connections

Note: 1. NC = Not Connected

2. See page 17 (onwards) for package dimensions, and how

to identify pin-1.

AI09072

E1-E2

SDA

VCC

M34F04

SCL

VSS

E1, E2

Chip Enable

SDA

Serial Data

SCL

Serial Clock

Write Control

VCC

Supply Voltage

VSS

Ground

SDA

VSS

SCL

VCC

AI09073

M34F04

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