http://www.www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf



STMicroelectronics Electronic Components Datasheet

M24128-B Datasheet

256/128 Kbit Serial I C Bus EEPROM With Three Chip Enable Lines

No Preview Available !

M24128-B pdf
M24256-B
M24128-B
256/128 Kbit Serial I C Bus EEPROM
With Three Chip Enable Lines
PRELIMINARY DATA
s Compatible with I2C Extended Addressing
s Two Wire I2C Serial Interface
Supports 400 kHz Protocol
s Single Supply Voltage:
– 4.5V to 5.5V for M24xxx-B
– 2.5V to 5.5V for M24xxx-BW
– 1.8V to 3.6V for M24xxx-BR
s Hardware Write Control
s BYTE and PAGE WRITE (up to 64 Bytes)
s RANDOM and SEQUENTIAL READ Modes
s Self-Timed Programming Cycle
s Automatic Address Incrementing
s Enhanced ESD/Latch-Up Behavior
s 100000 Erase/Write Cycles (minimum)
s 40 Year Data Retention (minimum)
DESCRIPTION
These I2C-compatible electrically erasable pro-
grammable memory (EEPROM) devices are orga-
nized as 32Kx8 bits (M24256-B) and 16Kx8 bits
(M24128-B).
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.
Table 1. Signal Names
E0, E1, E2
Chip Enable Inputs
SDA
Serial Data/Address Input/
Output
SCL
Serial Clock
WC Write Control
VCC
Supply Voltage
VSS Ground
8
1
PSDIP8 (BN)
0.25 mm frame
8
1
SO8 (MN)
150 mil width
14
1
TSSOP14 (DL)
169 mil width
8
1
TSSOP8 (DW)
169 mil width
Figure 1. Logic Diagram
VCC
3
E0-E2
SCL
WC
M24256-B
M24128-B
VSS
SDA
AI02809
February 2000
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1/19



STMicroelectronics Electronic Components Datasheet

M24128-B Datasheet

256/128 Kbit Serial I C Bus EEPROM With Three Chip Enable Lines

No Preview Available !

M24128-B pdf
M24256-B, M24128-B
Figure 2A. PSDIP8 Connections
Figure 2C. TSSOP14 Connections
M24256-B
M24128-B
E0
E1
E2
VSS
1
2
3
4
8 VCC
7 WC
6 SCL
5 SDA
AI02810
Figure 2B. SO8 and TSSOP8 Connections
E0
E1
E2
VSS
M24256-B
M24128-B
18
27
36
45
AI02811
VCC
WC
SCL
SDA
E0
E1
NC
NC
NC
E2
VSS
M24256-B
M24128-B
1 14
2 13
3 12
4 11
5 10
69
78
AI02812
VCC
WC
NC
NC
NC
SCL
SDA
Note: 1. NC = Not Connected
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-
Table 2. Absolute Maximum Ratings 1
Symbol
Parameter
Value
Unit
TA Ambient Operating Temperature
-40 to 125
°C
T STG
TLEAD
Storage Temperature
Lead Temperature during Soldering
PSDIP8: 10 seconds
SO8: 40 seconds
TSSOP8: 40 seconds
TSSOP14: 40 seconds
-65 to 150
260
215
215
215
°C
°C
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 )
2/19



STMicroelectronics Electronic Components Datasheet

M24128-B Datasheet

256/128 Kbit Serial I C Bus EEPROM With Three Chip Enable Lines

No Preview Available !

M24128-B pdf
M24256-B, M24128-B
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-
er clock, the master must have an open drain out-
put, and a pull-up resistor must be connected from
the SCL line to VCC. (Figure 3 indicates how the
value of the pull-up resistor can be calculated). In
most applications, though, this method of synchro-
nization is not employed, and so the pull-up resis-
tor is not necessary, provided that the master has
a push-pull (rather than open drain) output.
Serial Data (SDA)
The SDA pin is bi-directional, and is used to trans-
fer data in or out of the memory. It is an open drain
output that may be wire-OR’ed with other open
drain or open collector signals on the bus. A pull
up resistor must be connected from the SDA bus
to VCC. (Figure 3 indicates how the value of the
pull-up resistor can be calculated).
Chip Enable (E2, E1, E0)
These chip enable inputs are used to set the value
that is to be looked for on the three least significant
bits (b3, b2, b1) of the 7-bit device select code.
These inputs must be tied directly to VCC or VSS to
establish the device select code. When uncon-
nected, the E2, E1 and E0 inputs are internally
read as VIL (see Table 7 and Table 8)
Write Control (WC)
The hardware Write Control pin (WC) is useful for
protecting the entire contents of the memory from
inadvertent erase/write. The Write Control signal is
used to enable (WC=VIL) or disable (WC=VIH)
write instructions to the entire memory area. When
unconnected, the WC input is internally read as
VIL, and write operations are allowed.
When WC=1, Device Select and Address bytes
are acknowledged, Data bytes are not acknowl-
edged.
Please see the Application Note AN404 for a more
detailed description of the Write Control feature.
DEVICE OPERATION
The memory device supports the I2C protocol.
This is summarized in Figure 4, and is compared
with other serial bus protocols in Application Note
AN1001. Any device that sends data on to the bus
is defined to be a transmitter, and any device that
reads the data to be a receiver. The device that
controls the data transfer is known as the master,
and the other as the slave. A data transfer can only
be initiated by the master, which will also provide
the serial clock for synchronization. The memory
device is always a slave device in all communica-
tion.
Start Condition
START is identified by a high to low transition of
the SDA line while the clock, SCL, is stable in the
high state. A START condition must precede any
data transfer command. The memory device con-
tinuously monitors (except during a programming
Figure 3. Maximum RL Value versus Bus Capacitance (CBUS) for an I2C Bus
VCC
20
16
12
8
4
0
10
fc = 100kHz
fc = 400kHz
100
CBUS (pF)
SDA
MASTER
SCL
RL
RL
CBUS
1000
CBUS
AI01665
3/19




Part Number M24128-B
Description 256/128 Kbit Serial I C Bus EEPROM With Three Chip Enable Lines
Maker STMicroelectronics
Total Page 19 Pages
PDF Download
M24128-B pdf
Download PDF File
M24128-B pdf
View for Mobile






Related Datasheet

1 M24128-125 Automotive 128-Kbit serial I2C bus EEPROM STMicroelectronics
STMicroelectronics
M24128-125 pdf
2 M24128-A125 Automotive 128-Kbit serial I2C bus EEPROM STMicroelectronics
STMicroelectronics
M24128-A125 pdf
3 M24128-B 256/128 Kbit Serial I C Bus EEPROM With Three Chip Enable Lines STMicroelectronics
STMicroelectronics
M24128-B pdf
4 M24128-BF 128-Kbit serial I2C bus EEPROM STMicroelectronics
STMicroelectronics
M24128-BF pdf
5 M24128-BR 128-Kbit serial I2C bus EEPROM STMicroelectronics
STMicroelectronics
M24128-BR pdf
6 M24128-BW 128-Kbit serial I2C bus EEPROM STMicroelectronics
STMicroelectronics
M24128-BW pdf
7 M24128-DF 128-Kbit serial I2C bus EEPROM STMicroelectronics
STMicroelectronics
M24128-DF pdf
8 M24128-DRE 128-Kbit serial I2C bus EEPROM STMicroelectronics
STMicroelectronics
M24128-DRE pdf




Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components