NM24C08UFEMT8 [FAIRCHILD]

I2C Serial EEPROM ; I2C串行EEPROM\n
NM24C08UFEMT8
型号: NM24C08UFEMT8
厂家: FAIRCHILD SEMICONDUCTOR    FAIRCHILD SEMICONDUCTOR
描述:

I2C Serial EEPROM
I2C串行EEPROM\n

可编程只读存储器 电动程控只读存储器 电可擦编程只读存储器
文件: 总13页 (文件大小:102K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
August 1999  
NM24C08U/NM24C09U  
8K-Bit Serial EEPROM  
2-Wire Bus Interface  
General Description,  
Functions  
I I2C™ compatible interface  
The NM24C08U/09U devices are 8K (8,192) bit serial interface  
CMOS EEPROMs (Electrically Erasable Programmable Read-  
OnlyMemory).ThesedevicesfullyconformtotheStandardI2C™  
2-wire protocol which uses Clock (SCL) and Data I/O (SDA) pins  
to synchronously clock data between the "master" (for example a  
microprocessor) and the "slave" (the EEPROM device). In addi-  
tion, the serial interface allows a minimal pin count packaging  
designed to simplify PC board layout requirements and offers the  
designer a variety of low voltage and low power options.  
I 8,192 bits organized as 1,024 x 8  
I Extended 2.7V – 5.5V operating voltage  
I 100 KHz or 400 KHz operation  
I Self timed programming cycle (6ms typical)  
I "Programming complete" indicated by ACK polling  
I NM24C09U: Memory "Upper Block" Write Protect pin  
Features  
NM24C09U incorporates a hardware "Write Protect" feature, by  
which, the upper half of the memory can be disabled against  
programming by connecting the WP pin to VCC. This section of  
memory then effectively becomes a ROM (Read-Only Memory)  
andcannolongerbeprogrammedaslongasWPpinisconnected  
I The I2C™ interface allows the smallest I/O pincount of any  
EEPROM interface  
I 16 byte page write mode to minimize total write time per byte  
to VCC  
.
I Typical 200µA active current (ICCA)  
I Typical 1µA standby current (ISB) for "L" devices and 0.1µA  
standby current for "LZ" devices  
Fairchild EEPROMs are designed and tested for applications requir-  
ing high endurance, high reliability and low power consumption for a  
continuously reliable non-volatile solution for all markets.  
I Endurance: Up to 1,000,000 data changes  
I Data retention greater than 40 years  
Block Diagram  
V
CC  
V
SS  
WP  
H.V. GENERATION  
TIMING &CONTROL  
START  
STOP  
SDA  
LOGIC  
CONTROL  
LOGIC  
SLAVE ADDRESS  
REGISTER &  
2
E
PROM  
COMPARATOR  
XDEC  
ARRAY  
SCL  
A2  
WORD  
ADDRESS  
COUNTER  
R/W  
YDEC  
CK  
D
OUT  
DATA REGISTER  
D
IN  
DS800009-1  
I2Cis a registered trademark of Philips Electronics N.V.  
1
© 1999 Fairchild Semiconductor Corporation  
NM24C08U/09U Rev. B.1  
www.fairchildsemi.com  
Connection Diagrams  
Dual-In-Line Package (N), SO Package (M8), and TSSOP Package (MT8)  
NC  
NC  
A2  
1
2
3
4
8
7
6
5
V
CC  
NC  
NM24C08U  
SCL  
SDA  
V
SS  
DS800009-2  
Top View  
See Package Number N08E, M08A, and MTC08  
Pin Names  
A2  
VSS  
SDA  
SCL  
NC  
Device Address Input  
Ground  
Serial Data I/O  
Serial Clock Input  
No Connection  
Power Supply  
VCC  
Dual-In-Line Package (N), SO Package (M8), and TSSOP Package (MT8)  
NC  
NC  
A2  
1
2
3
4
8
7
6
5
V
CC  
WP  
NM24C09U  
SCL  
SDA  
V
SS  
DS800009-5  
Top View  
See Package Number N08E, M08A, and MTC08  
Pin Names  
NC  
No Connection  
A2  
VSS  
Device Address Input  
Ground  
SDA  
SCL  
WP  
VCC  
Serial Data I/O  
Serial Clock input  
Write Protect  
Power Supply  
2
www.fairchildsemi.com  
NM24C08U/09U Rev. B.1  
Ordering Information  
NM 24  
C
XX  
U
F
LZ  
E
XX  
Letter Description  
Package  
N
8-pin DIP  
M8  
MT8  
8-pin SOIC  
8-pin TSSOP  
Temp. Range  
None  
0 to 70°C  
V
E
-40 to +125°C  
-40 to +85°C  
Voltage Operating Range  
SCL Clock Frequency  
Blank  
L
LZ  
4.5V to 5.5V  
2.7V to 5.5V  
2.7V to 5.5V and  
<1µA Standby Current  
Blank  
F
100KHz  
400KHz  
Ultralite  
CS100UL Process  
Density  
08  
09  
8K  
8K with Write Protect  
C
CMOS Technology  
W
Total Array Write Protect  
Interface  
24  
IIC  
NM  
Fairchild Non-Volatile  
Memory  
3
www.fairchildsemi.com  
NM24C08U/09U Rev. B.1  
Product Specifications  
Operating Conditions  
Ambient Operating Temperature  
NM24C08U/09U  
Absolute Maximum Ratings  
Ambient Storage Temperature  
65°C to +150°C  
6.5V to 0.3V  
0°C to +70°C  
-40°C to +85°C  
-40°C to +125°C  
All Input or Output Voltages  
with Respect to Ground  
NM24C08UE/09UE  
NM24C08UV/09UV  
Lead Temperature  
Positive Power Supply  
NM24C08U/09U  
(Soldering, 10 seconds)  
+300°C  
4.5V to 5.5V  
2.7V to 5.5V  
2.7V to 5.5V  
ESD Rating  
2000V min.  
NM24C08UL/09UL  
NM24C08ULZ/09ULZ  
Standard VCC (4.5V to 5.5V) DC Electrical Characteristics  
Symbol  
Parameter  
Test Conditions  
Limits  
Max  
Units  
MinTyp  
(Note 1)  
ICCA  
Active Power Supply Current  
fSCL = 400 KHz  
fSCL = 100 KHz  
0.2  
1.0  
mA  
ISB  
ILI  
Standby Current  
VIN = GND or VCC  
VIN = GND to VCC  
VOUT = GND to VCC  
10  
0.1  
0.1  
50  
µA  
µA  
µA  
V
Input Leakage Current  
Output Leakage Current  
Input Low Voltage  
1
1
ILO  
VIL  
VIH  
VOL  
0.3  
VCC x 0.3  
VCC + 0.5  
0.4  
Input High Voltage  
Output Low Voltage  
VCC x 0.7  
V
IOL = 3 mA  
V
Low VCC (2.7V to 5.5V) DC Electrical Characteristics  
Symbol  
Parameter  
Test Conditions  
Limits  
Max  
Units  
MinTyp  
(Note 1)  
ICCA  
Active Power Supply Current fSCL = 400 KHz  
fSCL = 100 KHz  
0.2  
1.0  
mA  
ISB  
Standby Current  
VIN = GND VCC = 2.7V - 4.5V  
1
0.1  
10  
10  
1
50  
µA  
µA  
µA  
or VCC  
VCC = 2.7V - 4.5V  
VCC = 4.5V - 5.5V  
ILI  
ILO  
Input Leakage Current  
Output Leakage Current  
Input Low Voltage  
VIN = GND to VCC  
VOUT = GND to VCC  
0.1  
0.1  
1
1
µA  
µA  
V
VIL  
VIH  
VOL  
0.3  
VCC x 0.3  
VCC + 0.5  
0.4  
Input High Voltage  
VCC x 0.7  
V
Output Low Voltage  
IOL = 3 mA  
V
Capacitance TA = +25°C, f = 100/400 KHz, VCC = 5V (Note 2)  
Symbol  
CI/O  
Test  
Conditions  
VI/O = 0V  
Max Units  
Input/Output Capacitance (SDA)  
Input Capacitance (A0, A1, A2, SCL)  
8
6
pF  
pF  
CIN  
VIN = 0V  
Note 1: Typical values are TA = 25°C and nominal supply voltage (5V).  
Note 2: This parameter is periodically sampled and not 100% tested.  
4
www.fairchildsemi.com  
NM24C08U/09U Rev. B.1  
AC Conditions of Test  
Input Pulse Levels  
VCC x 0.1 to VCC x 0.9  
Input Rise and Fall Times  
10 ns  
Input & Output Timing Levels VCC x 0.5  
Output Load  
1 TTL Gate and CL = 100 pF  
Read and Write Cycle Limits (Standard and Low VCC Range 2.7V - 5.5V)  
Symbol  
Parameter  
100 KHz  
MinMax  
400 KHz  
Units  
MinMax  
fSCL  
TI  
SCL Clock Frequency  
100  
100  
3.5  
400  
50  
KHz  
ns  
Noise Suppression Time Constant at  
SCL, SDA Inputs (Minimum VIN  
Pulse width)  
tAA  
SCL Low to SDA Data Out Valid  
0.3  
4.7  
0.1  
1.3  
0.9  
µs  
µs  
tBUF  
Time the Bus Must Be Free before  
a New Transmission Can Start  
tHD:STA  
tLOW  
Start Condition Hold Time  
Clock Low Period  
4.0  
4.7  
4.0  
4.7  
0.6  
1.5  
0.6  
0.6  
µs  
µs  
µs  
µs  
tHIGH  
Clock High Period  
tSU:STA  
Start Condition Setup Time  
(for a Repeated Start Condition)  
tHD:DAT  
tSU:DAT  
tR  
Data in Hold Time  
0
0
µs  
ns  
µs  
ns  
µs  
ns  
ms  
Data in Setup Time  
250  
100  
SDA and SCL Rise Time  
SDA and SCL Fall Time  
Stop Condition Setup Time  
Data Out Hold Time  
1
0.3  
tF  
300  
300  
tSU:STO  
tDH  
4.7  
0.6  
50  
300  
tWR  
(Note 3)  
Write Cycle Time - NM24C08U/09U  
- NM24C08U/09UL, NM24C08U/09ULZ  
10  
15  
10  
15  
Note 3: The write cycle time (tWR) is the time from a valid stop condition of a write sequence to the end of the internal erase/program cycle. During the write cycle, the  
NM24C08U/09U bus interface circuits are disabled, SDA is allowed to remain high per the bus-level pull-up resistor, and the device does not respond to its slave address.  
5
www.fairchildsemi.com  
NM24C08U/09U Rev. B.1  
Bus Timing  
t
t
R
F
t
HIGH  
t
t
LOW  
LOW  
SCL  
t
SU:STO  
t
t
t
SU:DAT  
SU:STA  
HD:DAT  
t
HD:STA  
SDA  
IN  
t
BUF  
t
t
AA  
DH  
SDA  
OUT  
DS800009-8  
System Layout  
Typical System Configuration  
V
V
CC  
CC  
SDA  
SCL  
Master  
Transmitter/  
Receiver  
Slave  
Transmitter/  
Receiver  
Master  
Transmitter/  
Receiver  
Master  
Transmitter  
Slave  
Receiver  
DS800009-20  
Note:  
Due to open drain configuration of SDA, a bus-level pull-up resistor is called for, (typical value = 4.7k)  
Example of 16K of Memory on 2-Wire Bus  
V
V
CC  
Note:  
The SDA pull-up resistor is required due to the open-drain/open collector output of IIC bus devices.  
The SCL pull-up resistor is recommended because of the normal SCL line inactive 'high' state.  
It is recommended that the total line capacitance be less than 400pF  
CC  
SDA  
SCL  
V
V
V
V
CC  
CC  
CC  
CC  
NM24C02U/03U  
NM24C02U/03U  
NM24C04U/05U  
NM24C08U/09U  
A0 A1 A2  
V
A0 A1 A2  
V
A1 A2  
V
A2 V  
SS  
SS  
SS  
SS  
To V  
CC  
or V  
SS  
To V  
CC  
or V  
SS  
To V  
CC  
or V  
To V  
or V  
SS  
SS  
CC  
DS800009-9  
Device  
Address Pins  
A1  
Memory Size # of Page  
Blocks  
A0  
A2  
NM24C08U/09U  
No Connect  
No Connect  
ADR  
8192 Bits  
4
6
www.fairchildsemi.com  
NM24C08U/09U Rev. B.1  
Device Operation Input (A2)  
Pin Descriptions  
Device address pin A2 is connected to V  
or V  
to configure  
CC  
SS  
Serial Clock (SCL)  
the EEPROM chip address. Table 1 shows the active pin.  
The SCL input is used to clock all data into and out of the device.  
Serial Data (SDA)  
Table 1.  
SDA is a bidirectional pin used to transfer data into and out of the  
device. It is an open drain output and may be wireORed with any  
number of open drain or open collector outputs.  
Device  
A0  
A1  
A2 Effects of Addresses  
NM24C08U/09U  
x
x
ADR 21 = 2; 2 x (4 x 2k) = 16K  
WP Write Protection (NM24C09U Only)  
Background Information (IIC Bus)  
If tied to V , PROGRAM operations onto the upper half of the  
CC  
As mentioned, the IIC bus allows synchronous bidirectional com-  
munication between Transmitter/Receiver using the SCL (clock)  
and SDA (Data I/O) lines. All communication must be started with  
a valid START condition, concluded with a STOP condition and  
acknowledged by the Receiver with an ACKNOWLEDGE condi-  
tion.  
memory will not be executed. READ operations are possible. If  
tied to V , normal operation is enabled, READ/WRITE over the  
SS  
entire memory is possible.  
Thisfeatureallowstheusertoassigntheupperhalfofthememory  
as ROM which can be protected against accidental programming.  
When write is disabled, slave address and word address will be  
acknowledged but data will not be acknowledged.  
As shown below, the EEPROMs on the IIC bus may be configured  
in any manner required, the total memory addressed can not  
exceed 16K (16,384 bits). EEPROM memory address program-  
ming is controlled by 2 methods:  
Device Operation  
The NM24C08U/09U supports a bidirectional bus oriented proto-  
col. The protocol defines any device that sends data onto the bus  
as a transmitter and the receiving device as the receiver. The  
device controlling the transfer is the master and the device that is  
controlled is the slave. The master will always initiate data  
transfers and provide the clock for both transmit and receive  
operations. Therefore, the NM24C08U/09U will be considered a  
slave in all applications.  
Hardware configuring the A2 pin (Device Address pin) with  
pull-up or pull-down to VCC or VSS. All unused pins must be  
grounded (tied to VSS).  
Software addressing the required PAGE BLOCK within the  
device memory array (as sent in the Slave Address string).  
For devices with densities greater than 16K, a different protocol,  
theExtendedIICprotocol,isused.RefertoNM24C32Udatasheet  
(for example) for additional details.  
Clock and Data Conventions  
Addressing an EEPROM memory location involves sending a  
command string with the following information:  
[DEVICE TYPE][DEVICE ADDRESS][PAGE BLOCK AD-  
DRESS][BYTE ADDRESS]  
Data states on the SDA line can change only during SCL LOW.  
SDA state changes during SCL HIGH are reserved for indicating  
start and stop conditions. Refer to Figure 2 and Figure 3 on next  
page.  
Start Condition  
DEFINITIONS  
All commands are preceded by the start condition, which is a  
HIGH to LOW transition of SDA when SCL is HIGH. The  
NM24C08U/09UcontinuouslymonitorstheSDAandSCLlinesfor  
the start condition and will not respond to any command until this  
condition has been met.  
BYTE  
PAGE  
8 bits (byte) of data  
16 sequential addresses (one byte  
each) that may be programmed  
during a 'Page Write' programming  
cycle  
Stop Condition  
PAGE BLOCK  
2048 (2K) bits organized into 16  
pages of addressable memory.  
(8 bits) x (16 bytes) x (16 pages)  
= 2048 bits  
All communications are terminated by a stop condition, which is a  
LOW to HIGH transition of SDA when SCL is HIGH. The stop  
condition is also used by the NM24C08U/09U to place the device  
in the standby power mode.  
MASTER  
Any IIC device CONTROLLING the  
transfer of data (such as a  
microprocessor)  
Write Cycle Timing  
Acknowledge  
SLAVE  
Device being controlled  
(EEPROMs are always considered  
Slaves)  
Acknowledge is a hardware convention used to indicate success-  
ful data transfers. The transmitting device, either master or slave,  
will release the bus after transmitting eight bits.  
TRANSMITTER  
RECEIVER  
Device currently SENDING data on  
the bus (may be either a Master or  
Slave).  
During the ninth clock cycle the receiver will pull the SDA line to  
LOW to acknowledge that it received the eight bits of data. Refer  
to Figure 4.  
Device currently RECEIVING data  
on the bus (Master or Slave)  
7
www.fairchildsemi.com  
NM24C08U/09U Rev. B.1  
Write Cycle Timing  
SCL  
SDA  
8th BIT  
WORD n  
ACK  
t
WR  
STOP  
CONDITION  
START  
CONDITION  
DS800009-10  
Note:  
The write cycle time (tWR) is the time from a valid stop condition of a write sequence to the end of the internal erase/program cycle.  
Data Validity (Figure 2)  
SCL  
SDA  
DATA STABLE  
DATA  
CHANGE  
DS800009-11  
Start and Stop Definition (Figure 3)  
SCL  
SDA  
START  
STOP  
CONDITION  
CONDITION  
DS800009-12  
Acknowledge Response from Receiver (Figure 4)  
SCL FROM  
MASTER  
1
8
9
DATA OUTPUT  
FROM  
TRANSMITTER  
DATA OUTPUT  
FROM  
RECEIVER  
START  
ACKNOWLEDGE  
DS800009-13  
8
www.fairchildsemi.com  
NM24C08U/09U Rev. B.1  
Refer to the following table for Slave Addresses string details:  
Write Cycle Timing (Continued)  
TheNM24C08U/09Udevicewillalwaysrespondwithanacknowl-  
edge after recognition of a start condition and its slave address. If  
both the device and a write operation have been selected, the  
NM24C08U/09U will respond with an acknowledge after the  
receipt of each subsequent eight bit byte.  
Device  
A0 A1 A2 Page Page Block  
Blocks Addresses  
NM24C08U/09U  
P
P
A
4
00 01 10 11  
A: Refers to a hardware configured Device Address pin  
P: Refers to an internal PAGE BLOCK memory segment.  
In the read mode the NM24C08U/09U slave will transmit eight bits  
of data, release the SDA line and monitor the line for an acknowl-  
edge. If an acknowledge is detected and no stop condition is  
generated by the master, the slave will continue to transmit data.  
If an acknowledge is not detected, the slave will terminate further  
data transmissions and await the stop condition to return to the  
standby power mode.  
All IIC EEPROMs use an internal protocol that defines a PAGE  
BLOCK size of 2K bits (for Word addressess 0000 through 1111).  
Therefore, address bits A0, A1, or A2 (if designated 'P') are used  
to access a PAGE BLOCK in conjunction with the Word address  
used to access any individual data byte (Word).  
The last bit of the slave address defines whether a write or read  
condition is requested by the master. A '1' indicates that a read  
operation is to be executed, and a '0' initiates the write mode.  
Device Addressing  
Following a start condition the master must output the address of  
the slave it is accessing. The most significant four bits of the slave  
address are those of the device type identifier (see Figure 5). This  
is fixed as 1010 for all EEPROM devices.  
A simple review: After the NM24C08U/09U recognizes the start  
condition, the devices interfaced to the IIC bus wait for a slave  
address to be transmitted over the SDA line. If the transmitted  
slave address matches an address of one of the devices, the  
designated slave pulls the line LOW with an acknowledge signal  
and awaits further transmissions.  
Slave Addresses (Figure 5)  
Device Type  
Identifier  
Device  
Address  
1
0
1
0
A2  
A1  
A0 R/W (LSB)  
NM24C08U/09U  
Page  
Block Address  
DS800009-14  
9
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NM24C08U/09U Rev. B.1  
Acknowledge Polling  
Write Operations  
Once the stop condition is issued to indicate the end of the hosts  
write operation the NM24C08U/09U initiates the internal write  
cycle. ACK polling can be initiated immediately. This involves  
issuing the start condition followed by the slave address for a write  
operation. If the NM24C08U/09U is still busy with the write  
operation no ACK will be returned. If the NM24C08U/09U has  
completed the write operation an ACK will be returned and the  
host can then proceed with the next read or write operation.  
BYTE WRITE  
For a write operation a second address field is required which is  
awordaddressthatiscomprisedofeightbitsandprovidesaccess  
to any one of the 256 bytes in the selected page of memory. Upon  
receipt of the byte address the NM24C08U/09U responds with an  
acknowledge and waits for the next eight bits of data, again,  
responding with an acknowledge. The master then terminates the  
transfer by generating a stop condition, at which time the  
NM24C08U/09U begins the internal write cycle to the nonvolatile  
memory. While the internal write cycle is in progress the  
NM24C08U/09U inputs are disabled, and the device will not  
respond to any requests from the master. Refer to Figure 6 for the  
address, acknowledge and data transfer sequence.  
Write Protection (NM24C09U Only)  
Programming of the upper half of the memory will not take place  
if the WP pin of the NM24C09U is connected to V . The  
CC  
NM24C09U will accept slave and byte addresses; but if the  
memoryaccessediswriteprotectedbytheWPpin,theNM24C09U  
will not generate an acknowledge after the first byte of data has  
beenreceived,andthustheprogramcyclewillnotbestartedwhen  
the stop condition is asserted.  
PAGE WRITE  
The NM24C08U/09U is capable of a sixteen byte page write  
operation. It is initiated in the same manner as the byte write  
operation; but instead of terminating the write cycle after the first  
data byte is transferred, the master can transmit up to fifteen more  
bytes. After the receipt of each byte, the NM24C08U/09U will  
respond with an acknowledge.  
After the receipt of each byte, the internal address counter  
incrementstothenextaddressandthenextSDAdataisaccepted.  
If the master should transmit more than sixteen bytes prior to  
generating the stop condition, the address counter will "roll over"  
andthepreviouslywrittendatawillbeoverwritten. Aswiththebyte  
write operation, all inputs are disabled until completion of the  
internal write cycle. Refer to Figure 7 for the address, acknowl-  
edge, and data transfer sequence.  
Byte Write (Figure 6)  
S
T
A
R
T
S
T
O
P
SLAVE  
ADDRESS  
WORD  
ADDRESS  
Bus Activity:  
Master  
DATA  
SDA Line  
A
C
K
A
C
K
A
C
K
Bus Activity:  
NM24C08U/09U  
DS800009-15  
Page Write (Figure 7)  
S
T
A
R
T
S
T
O
P
SLAVE  
ADDRESS  
Bus Activity:  
Master  
WORD ADDRESS (n)  
DATA n  
DATA n + 1  
DATA n + 15  
SDA Line  
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
Bus Activity:  
NM24C08U/09U  
DS800009-16  
10  
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NM24C08U/09U Rev. B.1  
start condition and the slave address with the R/W bit set to one.  
ThiswillbefollowedbyanacknowledgefromtheNM24C08U/09U  
andthenbytheeightbitdata.Themasterwillnotacknowledgethe  
transfer but does generate the stop condition, and therefore the  
NM24C08U/09U discontinues transmission. Refer to Figure 9 for  
the address, acknowledge and data transfer sequence.  
Read Operations  
Read operations are initiated in the same manner as write  
operations, with the exception that the R/W bit of the slave  
address is set to a one. There are three basic read operations:  
current address read, random read, and sequential read.  
Current Address Read  
Sequential Read  
Internally the NM24C08U/09U contains an address counter that  
maintains the address of the last byte accessed, incremented by  
one. Therefore, if the last access (either a read or write) was to  
address n, the next read operation would access data from  
address n + 1. Upon receipt of the slave address with R/W set to  
one, the NM24C08U/09U issues an acknowledge and transmits  
the eight bit byte. The master will not acknowledge the transfer  
butdoesgenerateastopcondition,andthereforetheNM24C08U/  
09U discontinues transmission. Refer to Figure 8 for the se-  
quence of address, acknowledge and data transfer.  
Sequential reads can be initiated as either a current address read  
or random access read. The first word is transmitted in the same  
manner as the other read modes; however, the master now  
responds with an acknowledge, indicating it requires additional  
data. The NM24C08U/09U continues to output data for each  
acknowledge received. The read operation is terminated by the  
master not responding with an acknowledge or by generating a  
stop condition.  
The data output is sequential, with the data from address n  
followed by the data from n + 1. The address counter for read  
operations increments all word address bits, allowing the entire  
memory contents to be serially read during one operation. After  
the entire memory has been read, the counter "rolls over" and the  
NM24C08U/09U continues to output data for each acknowledge  
received. Refer to Figure 10 for the address, acknowledge, and  
data transfer sequence.  
Random Read  
Randomreadoperationsallowthemastertoaccessanymemory  
location in a random manner. Prior to issuing the slave address  
with the R/W bit set to one, the master must first perform a  
dummywrite operation. The master issues the start condition,  
slave address and then the byte address it is to read. After the  
byte address acknowledge, the master immediately reissues the  
Current Address Read (Figure 8)  
S
T
S
T
O
P
SLAVE  
ADDRESS  
Bus Activity:  
Master  
A
R
T
SDA Line  
A
C
K
NO  
A
C
Bus Activity:  
NM24C08U/09U  
DATA  
K
DS800009-17  
Random Read (Figure 9)  
S
T
A
R
T
S
S
T
T
A
R
T
SLAVE  
ADDRESS  
WORD  
ADDRESS  
SLAVE  
Bus Activity:  
Master  
O
P
ADDRESS  
SDA Line  
A
C
K
A
C
K
A
C
K
NO  
DATA n  
A
C
K
Bus Activity:  
NM24C08U/09U  
DS800009-18  
Sequential Read (Figure 10)  
S
T
O
P
A
C
K
A
C
K
A
C
K
Bus Activity:  
Slave  
Master  
Address  
SDA Line  
A
C
K
NO  
A
C
DATA n +1  
DATA n +1  
DATA n + 2  
DATA n + x  
Bus Activity:  
NM24C08U/09U  
K
DS800009-19  
11  
www.fairchildsemi.com  
NM24C08U/09U Rev. B.1  
Physical Dimensions inches (millimeters) unless otherwise noted  
0.189 - 0.197  
(4.800 - 5.004)  
8
7
6
5
0.228 - 0.244  
(5.791 - 6.198)  
1
2
3
4
Lead #1  
IDENT  
0.150 - 0.157  
0.053 - 0.069  
(1.346 - 1.753)  
(3.810 - 3.988)  
0.010 - 0.020  
(0.254 - 0.508)  
0.004 - 0.010  
(0.102 - 0.254)  
x 45°  
8° Max, Typ.  
All leads  
Seating  
Plane  
0.04  
0.0075 - 0.0098  
(0.190 - 0.249)  
Typ. All Leads  
(0.102)  
All lead tips  
0.014  
(0.356)  
0.016 - 0.050  
(0.406 - 1.270)  
Typ. All Leads  
0.050  
(1.270)  
Typ  
0.014 - 0.020  
(0.356 - 0.508)  
Typ.  
8-Pin Molded Small Outline Package (M8)  
Package Number M08A  
0.114 - 0.122  
(2.90 - 3.10)  
8
5
(7.72) Typ  
(4.16) Typ  
0.169 - 0.177  
(4.30 - 4.50)  
0.246 - 0.256  
(6.25 - 6.5)  
(1.78) Typ  
(0.42) Typ  
0.123 - 0.128  
(3.13 - 3.30)  
(0.65) Typ  
Land pattern recommendation  
1
4
Pin #1 IDENT  
0.0433  
Max  
(1.1)  
0.0035 - 0.0079  
See detail A  
0.002 - 0.006  
(0.05 - 0.15)  
0.0256 (0.65)  
Typ.  
Gage  
plane  
0.0075 - 0.0098  
(0.19 - 0.30)  
0°-8°  
DETAIL A  
Typ. Scale: 40X  
0.0075 - 0.0098  
(0.19 - 0.25)  
0.020 - 0.028  
(0.50 - 0.70)  
Seating  
plane  
Notes: Unless otherwise specified  
1. Reference JEDEC registration MO153. Variation AA. Dated 7/93  
8-Pin Molded Thin Shrink Small Outline Package  
Package Number MTC08  
12  
www.fairchildsemi.com  
NM24C08U/09U Rev. B.1  
Physical Dimensions inches (millimeters) unless otherwise noted  
0.373 - 0.400  
(9.474 - 10.16)  
0.090  
(2.286)  
8
7
0.032 ± 0.005  
(0.813 ± 0.127)  
RAD  
8
7
6
5
4
0.092  
(2.337)  
DIA  
0.250 - 0.005  
(6.35 ± 0.127)  
Pin #1  
IDENT  
+
Pin #1 IDENT  
1
Option 1  
1
2
3
Option 2  
0.280  
MIN  
0.040  
(1.016)  
Typ.  
(7.112)  
0.030  
0.145 - 0.200  
(3.683 - 5.080)  
0.039  
(0.991)  
MAX  
(0.762)  
0.300 - 0.320  
(7.62 - 8.128)  
20° ± 1°  
0.130 ± 0.005  
(3.302 ± 0.127)  
0.125 - 0.140  
95° ± 5°  
(3.175 - 3.556)  
0.065  
(1.651)  
0.125  
(3.175)  
DIA  
0.020  
90° ± 4°  
Typ  
0.009 - 0.015  
(0.229 - 0.381)  
(0.508)  
Min  
0.018 ± 0.003  
(0.457 ± 0.076)  
NOM  
+0.040  
-0.015  
0.325  
0.100 ± 0.010  
+1.016  
-0.381  
8.255  
(2.540 ± 0.254)  
0.045 ± 0.015  
(1.143 ± 0.381)  
0.060  
(1.524)  
0.050  
(1.270)  
Molded Dual-In-Line Package (N)  
Package Number N08E  
Life Support Policy  
Fairchild's products are not authorized for use as critical components in life support devices or systems without the express written  
approval of the President of Fairchild Semiconductor Corporation. As used herein:  
1. Life support devices or systems are devices or systems which,  
(a)areintendedforsurgicalimplantintothebody,or(b)support  
or sustain life, and whose failure to perform, when properly  
used in accordance with instructions for use provided in the  
labeling, can be reasonably expected to result in a significant  
injury to the user.  
2. A critical component is any component of a life support device  
or system whose failure to perform can be reasonably ex-  
pected to cause the failure of the life support device or system,  
or to affect its safety or effectiveness.  
Fairchild Semiconductor  
Americas  
Fairchild Semiconductor  
Europe  
Fairchild Semiconductor  
Hong Kong  
Fairchild Semiconductor  
Japan Ltd.  
Customer Response Center  
Tel. 1-888-522-5372  
Fax:  
Tel:  
Tel:  
Tel:  
Tel:  
+44 (0) 1793-856858  
8/F, Room 808, Empire Centre  
68 Mody Road, Tsimshatsui East  
Kowloon. Hong Kong  
Tel; +852-2722-8338  
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4F, Natsume Bldg.  
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Tokyo, 113-0034 Japan  
Tel: 81-3-3818-8840  
Fax: 81-3-3818-8841  
13  
www.fairchildsemi.com  
NM24C08U/09U Rev. B.1  

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