M24C01-WDW6TP ,16Kbit, 8Kbit, 4Kbit, 2Kbit and 1Kbit Serial IC Bus EEPROMFEATURES SUMMARY2■ Two Wire I C Serial Interface Figure 1. PackagesSupports 400kHz Protocol■ Single ..
M24C01WMN6 ,16Kbit, 8Kbit, 4Kbit, 2Kbit and 1Kbit Serial IC Bus EEPROMFEATURES SUMMARY . . . . . 1Figure 1. Packages . . . . . . 1SUMMARY DESCRIPTION ..
M24C01-WMN6 ,16Kbit, 8Kbit, 4Kbit, 2Kbit and 1Kbit Serial IC Bus EEPROMM24C16, M24C08M24C04, M24C02, M24C0116Kbit, 8Kbit, 4Kbit, 2Kbit and 1Kbit Serial I²C Bus EEPROM
M24C01-WMN6P ,16Kbit, 8Kbit, 4Kbit, 2Kbit and 1Kbit Serial IC Bus EEPROMLogic Diagram . . 4Table 1. Signal Names . . 4Power On Reset: VCC Lock-Out Write Prot ..
M24C01WMN6T ,16/8/4/2/1 Kbit Serial IC Bus EEPROMLogic Diagram(for the -R version of each device).The M24C16, M24C08, M24C04, M24C02,M24C01 are avai ..
M24C01-WMN6T ,16Kbit, 8Kbit, 4Kbit, 2Kbit and 1Kbit Serial IC Bus EEPROMFEATURES SUMMARY2■ Two Wire I C Serial Interface Figure 1. PackagesSupports 400kHz Protocol■ Single ..
M37920FGCGP , SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
M38002E2FP , 8-BIT SINGLE-CHIP MICROCOMPUTER
M38002E2SP , 8-BIT SINGLE-CHIP MICROCOMPUTER
M38002E2SP , 8-BIT SINGLE-CHIP MICROCOMPUTER
M38002E2SP , 8-BIT SINGLE-CHIP MICROCOMPUTER
M38002E4FP , 8-BIT SINGLE-CHIP MICROCOMPUTER
M24C01-MN3T-M24C01-RDW6T-M24C01-RMN6-M24C01-RMN6TP-M24C01-WBN6-M24C01-WBN6P-M24C01-WDW6T-M24C01-WDW6TP-M24C01WMN6-M24C01-WMN6-M24C01-WMN6P-M24C01-WMN6T-M24C01WMN6TP-M24C01-WMN6TP-M24C02-RDW6T-M24C02-RMN6-M24C02-WBN6-M24C02-WDS6TG-M24C02-WDW6T-M24C02-WDW6TP-M24C
16Kbit, 8Kbit, 4Kbit, 2Kbit and 1Kbit Serial IC Bus EEPROM
1/29March 2004
M24C16, M24C08
M24C04, M24C02, M24C0116Kbit, 8Kbit, 4Kbit, 2Kbit and 1Kbit Serial I²C Bus EEPROM
FEATURES SUMMARY Two Wire I2 C Serial Interface
Supports 400kHz Protocol Single Supply Voltage: 4.5 to 5.5V for M24Cxx 2.5 to 5.5V for M24Cxx-W 1.8 to 5.5V for M24Cxx-R Write Control Input BYTE and PAGE WRITE (up to 16 Bytes) RANDOM and SEQUENTIAL READ Modes Self-Timed Programming Cycle Automatic Address Incrementing Enhanced ESD/Latch-Up Behavior More than 1 Million Erase/Write Cycles More than 40 Year Data Retention
Figure 1. Packages
M24C16, M24C08, M24C04, M24C02, M24C01
TABLE OF CONTENTS
FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Figure 1. Packages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Figure 2. Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Table 1. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Power On Reset: VCC Lock-Out Write Protect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Figure 3. DIP, SO, TSSOP and MLP Connections (Top View). . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
SIGNAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Serial Clock (SCL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Serial Data (SDA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Chip Enable (E0, E1, E2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Write Control (WC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Figure 4. Maximum RL Value versus Bus Capacitance (CBUS) for an I2C Bus . . . . . . . . . . . . . . .5
Figure 5. I2C Bus Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Table 2. Device Select Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
DEVICE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Start Condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Stop Condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Acknowledge Bit (ACK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Data Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Memory Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7Table 3. Operating Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Figure 6. Write Mode Sequences with WC=1 (data write inhibited) . . . . . . . . . . . . . . . . . . . . . . . . .8
Write Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Byte Write. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Page Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8Figure 7. Write Mode Sequences with WC=0 (data write enabled) . . . . . . . . . . . . . . . . . . . . . . . . .9
Figure 8. Write Cycle Polling Flowchart using ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Minimizing System Delays by Polling On ACK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10Figure 9. Read Mode Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Read Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Random Address Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Current Address Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Sequential Read. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Acknowledge in Read Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
INITIAL DELIVERY STATE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13Table 4. Absolute Maximum Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3/29
M24C16, M24C08, M24C04, M24C02, M24C01
DC and AC PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14Table 5. Operating Conditions (M24Cxx) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Table 6. Operating Conditions (M24Cxx-W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Table 7. Operating Conditions (M24Cxx-R). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Table 8. AC Measurement Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Figure 10.AC Measurement I/O Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Table 9. Input Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Table 10. DC Characteristics (M24Cxx, Device Grade 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Table 11. DC Characteristics (M24Cxx, Device Grade 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Table 12. DC Characteristics (M24Cxx-W, Device Grade 6). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Table 13. DC Characteristics (M24Cxx-W, Device Grade 3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Table 14. DC Characteristics (M24Cxx-R) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Table 15. AC Characteristics (M24Cxx, Device Grade 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Table 16. AC Characteristics (M24Cxx, Device Grade 3; M24Cxx-W, Device Grade 6 or 3) . . . . .18
Table 17. AC Characteristics (M24Cxx-R). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Figure 11.AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21Figure 12.PDIP8 – 8 pin Plastic DIP, 0.25mm lead frame, Package Outline . . . . . . . . . . . . . . . . .21
Table 18. PDIP8 – 8 pin Plastic DIP, 0.25mm lead frame, Package Mechanical Data. . . . . . . . . .21
Figure 13.SO8 narrow – 8 lead Plastic Small Outline, 150 mils body width, Package Outline . . . .22
Table 19. SO8 narrow – 8 lead Plastic Small Outline, 150 mils body width, Package Mechanical Data
Figure 14.UFDFPN8 (MLP8) 8-lead Ultra thin Fine pitch Dual Flat Package No lead 2x3mm², Outline
Table 20. UFDFPN8 (MLP8) 8-lead Ultra thin Fine pitch Dual Flat Package No lead 2x3mm², Data.
Figure 15.TSSOP8 – 8 lead Thin Shrink Small Outline, Package Outline . . . . . . . . . . . . . . . . . . .24
Table 21. TSSOP8 – 8 lead Thin Shrink Small Outline, Package Mechanical Data . . . . . . . . . . . .24
Figure 16.TSSOP8 3x3mm² – 8 lead Thin Shrink Small Outline, 3x3mm² body size, Package Outline
Table 22. TSSOP8 3x3mm² – 8 lead Thin Shrink Small Outline, 3x3mm² body size, Mechanical Data
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26Table 23. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Table 24. How to Identify Current and New Products by the Process Identification Letter . . . . . . .27
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28Table 25. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
M24C16, M24C08, M24C04, M24C02, M24C01
SUMMARY DESCRIPTIONThese I2 C-compatible electrically erasable pro-
grammable memory (EEPROM) devices are orga-
nized as 2048/1024/512/256/128x 8 (M24C16,
M24C08, M24C04, M24C02, M24C01).
Figure 2. Logic Diagram2 C uses a two wire serial interface, comprising a
bi-directional data line and a clock line. The devic-
es carry a built-in 4-bit Device Type Identifier code
(1010) in accordance with the I2 C bus definition.
The device behaves as a slave in the I2 C 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 ProtectIn order to prevent data corruption and inadvertent
Write operations during Power-up, a Power On
Reset (POR) circuit is included. At Power-up, 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 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 (as defined in Table 6. and
Table 7.) must be applied before applying any log-
ic signal.
Figure 3. DIP, SO, TSSOP and MLP Connections (Top View)Note:1. NC = Not Connected See PACKAGE MECHANICAL section for package dimensions, and how to identify pin-1.
5/29
M24C16, M24C08, M24C04, M24C02, M24C01
SIGNAL DESCRIPTION
Serial Clock (SCL). This input signal is used to
strobe all data in and out of the device. In applica-
tions where this signal is used by slave devices to
synchronize the bus to a slower clock, the bus
master must have an open drain output, and a
pull-up resistor can be connected from Serial
Clock (SCL) to VCC. (Figure 4. 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 bus master
has a push-pull (rather than open drain) output.
Serial Data (SDA). This bi-directional signal is
used to transfer data in or out of the device. 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 Se-
rial Data (SDA) to VCC. (Figure 4. indicates how
the value of the pull-up resistor can be calculated).
Chip Enable (E0, E1, E2). These input signals
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
to VCC or VSS, to establish the Device Select
Code.
Write Control (WC). This input signal is useful
for protecting the entire contents of the memory
from inadvertent write operations. Write opera-
tions are disabled to the entire memory array when
Write Control (WC) is driven High. When uncon-
nected, the signal is internally read as VIL, and
Write operations are allowed.
When Write Control (WC) is driven High, Device
Select and Address bytes are acknowledged,
Data bytes are not acknowledged.
M24C16, M24C08, M24C04, M24C02, M24C01
Figure 5. I2 C Bus Protocol
Table 2. Device Select CodeNote:1. The most significant bit, b7, is sent first. E0, E1 and E2 are compared against the respective external pins on the memory device. A10, A9 and A8 represent most significant bits of the address.
7/29
M24C16, M24C08, M24C04, M24C02, M24C01
DEVICE OPERATION The device supports the I2 C protocol. This is sum-
marized in Figure 5.. 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 bus master, and the other as the slave de-
vice. A data transfer can only be initiated by the
bus master, which will also provide the serial clock
for synchronization. The M24Cxx device is always
a slave in all communication.
Start ConditionStart is identified by a falling edge of Serial Data
(SDA) while Serial Clock (SCL) is stable in the
High state. A Start condition must precede any
data transfer command. The device continuously
monitors (except during a Write cycle) Serial Data
(SDA) and Serial Clock (SCL) for a Start condition,
and will not respond unless one is given.
Stop ConditionStop is identified by a rising edge of Serial Data
(SDA) while Serial Clock (SCL) is stable and driv-
en High. A Stop condition terminates communica-
tion between the device and the bus master. A
Read command that is followed by NoAck can be
followed by a Stop condition to force the device
into the Stand-by mode. A Stop condition at the
end of a Write command triggers the internal EE-
PROM Write cycle.
Acknowledge Bit (ACK)The acknowledge bit is used to indicate a success-
ful byte transfer. The bus transmitter, whether it be
bus master or slave device, releases Serial Data
(SDA) after sending eight bits of data. During theth clock pulse period, the receiver pulls Serial
Data (SDA) Low to acknowledge the receipt of the
eight data bits.
Data InputDuring data input, the device samples Serial Data
(SDA) on the rising edge of Serial Clock (SCL).
For correct device operation, Serial Data (SDA)
must be stable during the rising edge of Serial
Clock (SCL), and the Serial Data (SDA) signal
must change only when Serial Clock (SCL) is driv-
en Low.
Memory AddressingTo start communication between the bus master
and the slave device, the bus master must initiate
a Start condition. Following this, the bus master
sends the Device Select Code, shown in Table 2.
(on Serial Data (SDA), most significant bit first).
The Device Select Code consists of a 4-bit Device
Type Identifier, and a 3-bit Chip Enable “Address”
(E2, E1, E0). To address the memory array, the 4-
bit Device Type Identifier is 1010b.
Each device is given a unique 3-bit code on the
Chip Enable (E0, E1, E2) inputs. When the Device
Select Code is received, the device only responds
if the Chip Enable Address is the same as the val-
ue on the Chip Enable (E0, E1, E2) inputs. How-
ever, those devices with larger memory capacities
(the M24C16, M24C08 and M24C04) need more
address bits. E0 is not available for use on devices
that need to use address line A8; E1 is not avail-
able for devices that need to use address line A9,
and E2 is not available for devices that need to use
address line A10 (see Figure 3. and Table 2. for
details). Using the E0, E1 and E2 inputs, up to
eight M24C02 (or M24C01), four M24C04, two
M24C08 or one M24C16 devices can be connect-
ed to one I2 C bus. In each case, and in the hybrid
cases, this gives a total memory capacity of Kbits, 2 KBytes (except where M24C01 devic-
es are used).
The 8th bit is the Read/Write bit (RW). This bit is
set to 1 for Read and 0 for Write operations.
If a match occurs on the Device Select code, the
corresponding device gives an acknowledgment
on Serial Data (SDA) during the 9th bit time. If the
device does not match the Device Select code, it
deselects itself from the bus, and goes into Stand-
by mode.
Table 3. Operating ModesNote:1. X = VIH or VIL.
M24C16, M24C08, M24C04, M24C02, M24C01
Figure 6. Write Mode Sequences with WC=1 (data write inhibited)
Write Operations Following a Start condition the bus master sends
a Device Select Code with the RW bit reset to 0.
The device acknowledges this, as shown in Figure
7., and waits for an address byte. The device re-
sponds to the address byte with an acknowledge
bit, and then waits for the data byte.
When the bus master generates a Stop condition
immediately after the Ack bit (in the “10th bit” time
slot), either at the end of a Byte Write or a Page
Write, the internal memory Write cycle is triggered.
A Stop condition at any other time slot does not
trigger the internal Write cycle.
During the internal Write cycle, Serial Data (SDA)
and Serial Clock (SCL) are ignored, and the de-
vice does not respond to any requests.
Byte WriteAfter the Device Select code and the address byte,
the bus master sends one data byte. If the ad-
dressed location is Write-protected, by Write Con-
trol (WC) being driven High (during the period from
the Start condition until the end of the address
byte), the device replies to the data byte with
NoAck, as shown in Figure 6., and the location is
not modified. If, instead, the addressed location is
not Write-protected, the device replies with Ack.
The bus master terminates the transfer by gener-
ating a Stop condition, as shown in Figure 7..
Page WriteThe Page Write mode allows up to 16 bytes to be
written in a single Write cycle, provided that they
are all located in the same page in the memory:
that is, the most significant memory address bits
are the same. If more bytes are sent than will fit up
to the end of the page, a condition known as ‘roll-
over’ occurs. This should be avoided, as data
starts to become overwritten in an implementation
dependent way.
The bus master sends from 1 to 16 bytes of data,
each of which is acknowledged by the device if
Write Control (WC) is Low. If the addressed loca-
tion is Write-protected, by Write Control (WC) be-
ing driven High (during the period from the Start
9/29
M24C16, M24C08, M24C04, M24C02, M24C01condition until the end of the address byte), the de-
vice replies to the data bytes with NoAck, as
shown in Figure 6., and the locations are not mod-
ified. After each byte is transferred, the internal
byte address counter (the 4 least significant ad-
dress bits only) is incremented. The transfer is ter-
minated by the bus master generating a Stop
condition.
M24C16, M24C08, M24C04, M24C02, M24C01
Figure 8. Write Cycle Polling Flowchart using ACK
Minimizing System Delays by Polling On ACKDuring the internal Write cycle, the device discon-
nects itself from the bus, and writes a copy of the
data from its internal latches to the memory cells.
The maximum Write time (tw) is shown in Table
15. to Table 17., but the typical time is shorter. To
make use of this, a polling sequence can be used
by the bus master.
The sequence, as shown in Figure 8., is: Initial condition: a Write cycle is in progress. Step 1: the bus master issues a Start condition
followed by a Device Select Code (the first
byte of the new instruction). Step 2: if the device is busy with the internal
Write cycle, no Ack will be returned and the
bus master goes back to Step 1. If the device
has terminated the internal Write cycle, it
responds with an Ack, indicating that the
device is ready to receive the second part of
the instruction (the first byte of this instruction
having been sent during Step 1).
11/29
M24C16, M24C08, M24C04, M24C02, M24C01
Figure 9. Read Mode SequencesNote: The seven most significant bits of the Device Select Code of a Random Read (in the 1st and 3rd bytes) must be identical.
Read OperationsRead operations are performed independently of
the state of the Write Control (WC) signal.
The device has an internal address counter which
is incremented each time a byte is read.
Random Address ReadA dummy Write is first performed to load the ad-
dress into this address counter (as shown in Fig-
ure 9.) but without sending a Stop condition. Then,
the bus master sends another Start condition, and
repeats the Device Select Code, with the RW bit
set to 1. The device acknowledges this, and out-
puts the contents of the addressed byte. The bus
master must not acknowledge the byte, and termi-
nates the transfer with a Stop condition.
Current Address ReadFor the Current Address Read operation, following
a Start condition, the bus master only sends a De-
vice Select Code with the RW bit set to 1. The de-
vice acknowledges this, and outputs the byte
addressed by the internal address counter. The
counter is then incremented. The bus master ter-
minates the transfer with a Stop condition, as
shown in Figure 9., without acknowledging the
byte.
M24C16, M24C08, M24C04, M24C02, M24C01
Sequential ReadThis operation can be used after a Current Ad-
dress Read or a Random Address Read. The bus
master does acknowledge the data byte output,
and sends additional clock pulses so that the de-
vice continues to output the next byte in sequence.
To terminate the stream of bytes, the bus master
must not acknowledge the last byte, and must
generate a Stop condition, as shown in Figure 9..
The output data comes from consecutive address-
es, with the internal address counter automatically
incremented after each byte output. After the last
memory address, the address counter ‘rolls-over’,
and the device continues to output data from
memory address 00h.
Acknowledge in Read ModeFor all Read commands, the device waits, after
each byte read, for an acknowledgment during theth bit time. If the bus master does not drive Serial
Data (SDA) Low during this time, the device termi-
nates the data transfer and switches to its Stand-
by mode.
INITIAL DELIVERY STATEThe device is delivered with the memory array
erased: all bits are set to 1 (each byte contains
FFh).
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M24C16, M24C08, M24C04, M24C02, M24C01
MAXIMUM RATINGStressing the device above the rating listed in the
Absolute Maximum Ratings" table may cause per-
manent 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 im-
plied. Exposure to Absolute Maximum Rating con-
ditions for extended periods may affect device
reliability. Refer also to the STMicroelectronics
SURE Program and other relevant quality docu-
ments.
Table 4. Absolute Maximum RatingsNote:1. Compliant with JEDEC Std J-STD-020B (for small body, Sn-Pb or Pb assembly), the ST ECOPACK® 7191395 specification, and
the European directive on Restrictions on Hazardous Substances (RoHS) 2002/95/EU JEDEC Std JESD22-A114A (C1=100 pF, R1=1500 Ω, R2=500 Ω)
M24C16, M24C08, M24C04, M24C02, M24C01
DC AND AC PARAMETERSThis section summarizes the operating and mea-
surement conditions, and the DC and AC charac-
teristics of the device. The parameters in the DC
and AC Characteristic tables that follow are de-
rived from tests performed under the Measure-
ment Conditions summarized in the relevant
tables. Designers should check that the operating
conditions in their circuit match the measurement
conditions when relying on the quoted parame-
ters.
Table 5. Operating Conditions (M24Cxx)Note:1. This range is Not for New Design, and will soon be replaced by the M24Cxx-W range.
Table 6. Operating Conditions (M24Cxx-W)
Table 7. Operating Conditions (M24Cxx-R)
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M24C16, M24C08, M24C04, M24C02, M24C01
Table 8. AC Measurement Conditions
Figure 10. AC Measurement I/O Waveform
Table 9. Input ParametersNote:1. TA = 25°C, f = 400kHz Sampled only, not 100% tested.
Table 10. DC Characteristics (M24Cxx, Device Grade 6)Note:1. This range is Not for New Design, and will soon be replaced by the M24Cxx-Wxx6 range.
