M24128 STMicroelectronics, M24128 Datasheet - Page 2

• Manufacturer Part Number: M24128
• Description: 256/128 Kbit Serial IC Bus EEPROM Without Chip Enable Lines
• Manufacturer: STMicroelectronics

M24256, M24128
Figure 2A. DIP Connections
Note: 1. NC = Not Connected
The memory behaves as a slave device in the I
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 9
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: V
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
Table 2. Absolute Maximum Ratings
Note: 1. Except for the rating “Operating Temperature Range”, stresses above those listed in the Table “Absolute Maximum Ratings” may
2/16
Symbol
T
2. MIL-STD-883C, 3015.7 (100 pF, 1500
T
V
V
V
LEAD
T
STG
ESD
CC
A
IO
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.
V SS
Ambient Operating Temperature
Storage Temperature
Lead Temperature during Soldering
Input or Output range
Supply Voltage
Electrostatic Discharge Voltage (Human Body model)
NC
NC
NC
CC
1
2
3
4
M24256
M24128
Lock-Out Write Protect
AI01883
8
7
6
5
V CC
WC
SCL
SDA
)
th
1
Parameter
bit time,
2
C
Figure 2B. SO Connections
Note: 1. NC = Not Connected
held active until the V
POR threshold value, and all operations are dis-
abled – the device will not respond to any com-
mand. In the same way, when V
operating voltage, below the POR threshold value,
all operations are disabled and the device will not
respond to any command. A stable and valid V
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 V
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-
PSDIP8: 10 sec
SO8: 40 sec
2
V SS
NC
NC
NC
CC
. (Figure 3 indicates how the
1
2
3
4
M24256
M24128
CC
AI01884
–40 to 125
–65 to 150
–0.6 to 6.5
–0.3 to 6.5
voltage has reached the
Value
4000
8
7
6
5
260
215
CC
V CC
WC
SCL
SDA
drops from the
Unit
°C
°C
°C
V
V
V
CC