ST25C04B3TR datasheet(7/16 Pages) STMICROELECTRONICS

7 / 16 page

SCL

SDA IN

SCL

SDA OUT

SCL

SDA IN

tCHCL

tDLCL

tCHDX

START

CONDITION

tCLCH

tDXCX

tCLDX

SDA

INPUT

SDA

CHANGE

tCHDH

tDHDL

STOP &

BUS FREE

DATA VALID

tCLQV

tCLQX

DATA OUTPUT

tCHDH

STOP

CONDITION

tCHDX

START

CONDITION

WRITE CYCLE

AI00795B

Figure 5. AC Waveforms

Write Operations

The Multibyte Write mode (only available on the

ST24/25C04 versions) is selected when the MODE

pin is at VIH and the Page Write mode when MODE

pin is at VIL. The MODE pin may be driven dynami-

cally with CMOS input levels.

Following a START condition the master sends a

device select code with the RW bit reset to ’0’. The

memory acknowledges this and waits for a byte

address. The byte address of 8 bits provides ac-

cess to one block of 256 bytes of the memory. After

receipt of the byte address the device again re-

sponds with an acknowledge.

For the ST24/25W04 versions, any write command

with WC = 1 will not modify the memory content.

Byte Write. In the Byte Write mode the master

sends one data byte, which is acknowledged by the

memory. The master then terminates the transfer

by generating a STOP condition. The Write mode

is independant of the state of the MODE pin which

could be left floating if only this mode was to be

used. However it is not a recommended operating

mode, as this pin has to be connected to either VIH

or VIL, to minimize the stand-by current.

7/16

ST24/25C04, ST24/25W04

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