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PDF M14256 Data sheet ( Hoja de datos )

Número de pieza M14256
Descripción Memory Micromodules General Information for D1/ D2 and C Packaging
Fabricantes STMicroelectronics 
Logotipo STMicroelectronics Logotipo



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M14256
M14128
Memory Card IC
256/128 Kbit Serial I²C Bus EEPROM
PRELIMINARY DATA
s Compatible with I2C Extended Addressing
s Two Wire I2C Serial Interface
Supports 400 kHz Protocol
s Single Supply Voltage (2.5 V to 5.5 V)
s Hardware Write Control
s BYTE and PAGE WRITE (up to 64 Bytes)
s BYTE, RANDOM and SEQUENTIAL READ
Modes
s Self-Timed Programming Cycle
s Automatic Address Incrementing
s Enhanced ESD/Latch-Up Behaviour
s 100,000 Erase/Write Cycles (minimum)
s 40 Year Data Retention (minimum)
s 5 ms Programming Time (typical)
Micromodule (D22)
DESCRIPTION
Each device is an electrically erasable program-
mable memory (EEPROM) fabricated with STMi-
croelectronics’s High Endurance, Double
Polysilicon, CMOS technology. This guarantees
an endurance typically well above 100,000 Erase/
Write cycles, with a data retention of 40 years. The
memory operates with a power supply as low as
2.5 V.
The M14256 and M14128 are available in micro-
module form only. For availability of the M14256 or
Figure 1. Logic Diagram
VCC
Table 1. Signal Names
SDA
Serial Data/Address Input/
Output
SCL Serial Clock
WC Write Control
VCC
Supply Voltage
GND
Ground
SCL SDA
WC M14xxx
GND
AI02217
October 1999
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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M14256 pdf
M14256, M14128
Write Operations
Following a START condition the master sends a
Device Select code with the RW bit set to ’0’, as
shown in Table 6. The memory acknowledges it
and waits for two bytes of address, which provides
access to the memory area. After receipt of each
byte address, the memory again responds with an
acknowledge and waits for the data byte. Writing
in the memory may be inhibited if the input pin WC
is taken high.
Any write command with WC=1 (during a period of
time from the START condition until the end of the
two bytes address) will not modify the memory
content and will NOT be acknowledged on data
bytes, as shown in Figure 5.
Byte Write
In the Byte Write mode, after the Device Select
code and the address, the master sends one data
byte. If the addressed location is write protected by
the WC pin, the memory replies with a NoACK,
and the location is not modified. If, instead, the WC
pin has been held at 0, as shown in Figure 6, the
memory replies with an ACK. The master termi-
nates the transfer by generating a STOP condi-
tion.
Page Write
The Page Write mode allows up to 64 bytes to be
written in a single write cycle, provided that they
are all located in the same ’row’ in the memory:
that is the most significant memory address bits
(b14-b6 for the M14256 and b13-b6 for the
M14128) are the same. The master sends from
one up to 64 bytes of data, each of which is ac-
knowledged by the memory if the WC pin is low. If
the WC pin is high, each data byte is followed by a
NoACK and the location is not modified. After each
byte is transferred, the internal byte address coun-
ter (the six least significant bits only) is increment-
ed. The transfer is terminated by the master
generating a STOP condition. Care must be taken
to avoid address counter ’roll-over’ which could re-
sult in data being overwritten. Note that, for any
Figure 5. Write Mode Sequences with WC=1
WC
BYTE WRITE
ACK
ACK
ACK
NO ACK
DEV SEL
BYTE ADDR BYTE ADDR
DATA IN
R/W
WC
PAGE WRITE
WC (cont'd)
PAGE WRITE
(cont'd)
ACK
ACK
ACK
NO ACK
DEV SEL
BYTE ADDR BYTE ADDR DATA IN 1
DATA IN 2
R/W
NO ACK
NO ACK
DATA IN N
AI01120B
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M14256 arduino
Table 11. Ordering Information Scheme
Example:
M14256 - W D22
M14256, M14128
Memory Capacity
256 256 Kbit
128 128 Kbit
Delivery Form
D22
Module on Super 35 mm
film
Operating Voltage
W 2.5 V to 5.5 V
ORDERING INFORMATION
Devices are shipped from the factory with the memory content set at all ‘1’s (FFh).
The notation used for the device number is as shown in Table 11. For a list of available options (speed,
package, etc.) or for further information on any aspect of this device, please contact the ST Sales Office
nearest to you.
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