FM24C32UFTHN [FAIRCHILD]

EEPROM ; EEPROM\n
FM24C32UFTHN
型号: FM24C32UFTHN
厂家: FAIRCHILD SEMICONDUCTOR    FAIRCHILD SEMICONDUCTOR
描述:

EEPROM
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:88K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
September 2002  
FM24C32U – 32K-Bit Standard 2-Wire Bus  
Interface Serial EEPROM  
General Description  
Features  
FM24C32U is a 32Kbit CMOS non-volatile serial EEPROM orga-  
nized as 4K x 8 bit memory. This device confirms to Extended IIC  
2-wire protocol that allows accessing of memory in excess of  
16Kbit on an IIC bus. This serial communication protocol uses a  
Clock signal (SCL) and a Data signal (SDA) to synchronously  
clock data between a master (e.g. a microcontroller) and a slave  
(EEPROM). FM24C32U is designed to minimize pin count and  
simplify PC board layout requirements.  
I Extended operating voltage: 2.7V to 5.5V  
I Up to 400 KHz clock frequency at 2.7V to 5.5V  
I Low power consumption  
0.2mA active current typical  
10µA standby current typical  
1µA standby current typical (L version)  
0.1µA standby current typical (LZ version)  
I Schmitt trigger inputs  
FM24C32U offers hardware write protection where by the upper  
half (upper 16Kbit) of the memory array can be write protected by  
connecting WP pin to VCC. This section of memory then becomes  
I 32 byte page write mode  
I Self timed write cycle (6ms typical)  
I Hardware Write Protection for upper half of the array  
unalterable until the WP pin is switched to VSS  
.
I Low VCC programming lockout for VCC = 5V 10% (“H” option)  
Internal ERASE/WRITE logic is disabled if VCC is below 3.8V  
“LZ” and “L” versions of FM24C32U offer very low standby current  
making them suitable for low power applications. This device is  
offered in both SO and DIP packages.  
I Endurance: 1 Million data changes  
I Data Retention: Greater than 40 years  
I Packages: 8-Pin DIP and 8-Pin SO  
Fairchild EEPROMs are designed and tested for applications  
requiringhighendurance, highreliabilityandlowpowerconsump-  
tion.  
I Temperature range  
Commercial: 0°C to +70°C  
Industrial (V): -40°C to +85°C  
Automotive (E): -40°C to +125°C  
Block Diagram  
V
SS  
WRITE  
LOCKOUT  
V
CC  
H.V. GENERATION  
TIMING &CONTROL  
WP  
START  
STOP  
SDA  
LOGIC  
CONTROL  
LOGIC  
SLAVE ADDRESS  
REGISTER &  
COMPARATOR  
2
E
PROM  
ARRAY  
XDEC  
SCL  
A2  
A1  
A0  
WORD  
ADDRESS  
COUNTER  
R/W  
YDEC  
CK  
D
OUT  
DATA REGISTER  
D
IN  
1
© 2001 Fairchild Semiconductor Corporation  
FM24C32U Rev. A.1  
www.fairchildsemi.com  
Connection Diagram  
Dual-in-Line Package (N) and SO Package (M8)  
A0  
A1  
1
2
3
4
8
7
6
5
VCC  
WP  
FM24C32U  
A2  
SCL  
SDA  
VSS  
See Package Number N08E and M08A  
Pin Names  
VSS  
SDA  
SCL  
WP  
Ground  
Serial Data I/O  
Serial Clock Input  
Write Protect  
VCC  
Power Supply  
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FM24C32U Rev. A.1  
Ordering Information  
FM 24  
C
XX  
U
F
T
LZ  
E
XXX  
Letter  
Description  
Package  
N
8-pin DIP  
M8  
8-pin SOIC  
Temp. Range  
None  
0 to 70°C  
V
E
-40 to +125°C  
-40 to +85°C  
Voltage Operating Range  
Blank  
H
4.5V to 5.5V  
4.5V to 5.5V and VCC  
Lockout  
L
2.7V to 5.5V  
LZ  
2.7V to 5.5V and  
<1µA Standby Current  
Blank  
T
Normal Pin Out  
Rotated Die Pin Out  
SCL Clock Frequency  
Process  
Blank  
F
100KHz  
400KHz  
U
Ultralite Process  
Density  
32  
C
32K with Write Protect  
CMOS Technology  
IIC  
Interface  
24  
FM  
Fairchild Non-Volatile  
Memory  
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FM24C32U Rev. A.1  
Product Specifications  
Operating Conditions  
Absolute Maximum Ratings  
Ambient Operating Temperature  
FM24C32U  
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  
FM24C32UE  
FM24C32UV  
Lead Temperature  
Positive Power Supply  
FM24C32U/FM24C32UH  
FM24C32UL  
(Soldering, 10 seconds)  
+300°C  
4.5V to 5.5V  
2.7V to 5.5V  
2.7V to 5.5V  
ESD Rating  
2000V min.  
FM24C32ULZ  
Standard VCC (4.5V to 5.5V) DC Electrical Characteristics  
Symbol  
Parameter  
Test Conditions  
Limits  
Typ  
Units  
Min  
Max  
(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  
10  
50  
µA  
Input Leakage Current  
VIN = GND A0, A1, A2, WP  
0.1  
0.5  
1
2
µA  
µA  
to VCC  
SCL  
ILO  
VIL  
Output Leakage Current  
Input Low Voltage  
VOUT = GND to VCC  
0.1  
1
µA  
V
0.3  
VCC x 0.3  
VCC + 0.5  
0.4  
VIH  
VOL  
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  
Units  
Min  
Typ  
Max  
(Note 1)  
ICCA  
Active Power Supply Current fSCL = 400 KHz  
fSCL = 100 KHz  
0.2  
1.0  
mA  
ISB  
(Note 3)  
Standby Current  
VIN = GND VCC = 2.7V - 4.5V (L)  
1
0.1  
10  
10  
1
50  
µA  
µA  
µA  
or VCC  
VCC = 2.7V - 4.5V (LZ)  
VCC = 4.5V - 5.5V  
ILI  
Input Leakage Current  
VIN = GND A0, A1, A2, WP  
to VCC SCL  
0.1  
0.5  
1
2
µA  
µA  
ILO  
VIL  
Output Leakage Current  
Input Low Voltage  
VOUT = GND to VCC  
0.1  
1
µA  
V
0.3  
VCC x 0.3  
VCC + 0.5  
0.4  
VIH  
VOL  
Input High Voltage  
Output Low Voltage  
VCC x 0.7  
V
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.  
Note 3: The "L" and "LZ" versions can be operated in the 2.7V to 5.5V VCC range. However the ISB values for L and LZ are applicable only when VCC is in the 2.7V to 4.5V range.  
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FM24C32U Rev. A.1  
AC Testing Input/Output Waveforms  
AC Test Conditions  
Input Pulse Levels  
VCC x 0.1 to VCC x 0.9  
10 ns  
0.9VCC  
0.7VCC  
0.3VCC  
Input Rise and Fall Times  
0.1VCC  
Input & Output Timing Levels VCC x 0.3 to VCC x 0.7  
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  
400 KHz  
Units  
Min  
Max  
Min  
Max  
fSCL  
TI  
SCL Clock Frequency  
100  
100  
3.5  
400  
KHz  
ns  
Noise Suppression Time Constant at  
SCL, SDA Inputs (Minimum VIN  
Pulse width)  
50  
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
ns  
ns  
µs  
ns  
µs  
ns  
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 4)  
Write Cycle Time  
4.5V to 5.5V VCC  
2.7V to 4.5V VCC  
10  
15  
10  
15  
ms  
Note 4: 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  
FM24C32U 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. Refer  
"Write Cycle Timing" diagram.  
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
AA  
t
DH  
SDA  
OUT  
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FM24C32U Rev. A.1  
Write Cycle Timing  
SCL  
SDA  
8th BIT  
WORD n  
ACK  
t
WR  
STOP  
START  
CONDITION  
CONDITION  
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.  
Typical System Configuration  
VCC  
VCC  
SDA  
SCL  
Master  
Transmitter/  
Receiver  
Slave  
Transmitter/  
Receiver  
Master  
Transmitter/  
Receiver  
Master  
Transmitter  
Slave  
Receiver  
Note:  
Due to open drain configuration of SDA and SCL, a bus-level pull-up resistor is called for, (typical value = 4.7k)  
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FM24C32U Rev. A.1  
Device Type  
Background Information (IIC Bus)  
IIC bus is designed to support a variety of devices such as RAMs,  
EPROMs etc., along with EEPROMS. Hence to properly identify  
various devices on the IIC bus, a 4-bit Device Typeidentifier  
stringisused. ForEEPROMS, this4-bitstringis1-0-1-0. EveryIIC  
device on the bus internally compares this 4-bit string to its own  
Device Typestring to ensure proper device selection.  
Extended IIC specification is an extension of Standard IIC speci-  
fication to allow addressing of EEPROMs with more than 16Kbits  
of memory on an IIC bus. The difference between the two  
specifications is that Extended IIC specification defines two bytes  
of Array Addressinformation while Standard IIC specification  
defines only one. All other aspects are identical between the two  
specifications. Using two bytes of Array Address and 3 address  
signals (A2, A1 and A0), it is now possible to address up to 4 Mbits  
(28 * 28 * 23 * 8 = 4 Mbits) of memory on an IIC bus.  
Device/Page Block Selection  
Whenmultipledevicesofthesametype(e.g.multipleEEPROMS)  
are present on the IIC bus, then the A2, A1 and A0 address  
information bits are used in device selection. Every IIC device on  
the bus internally compares this 3-bit string to its own physical  
configuration (A2, A1 and A0 pins) to ensure proper device  
selection. This comparison is in addition to the Device Type”  
comparison.  
Note that due to format difference, it is not possible to have  
peripherals which follow Standard IIC specification (e.g. 16K bit  
EEPROM) and peripherals which follow Extended IIC specifica-  
tion (e.g. 32K bit EEPROM) on a common IIC bus.  
IIC bus allows synchronous bi-directional communication be-  
tween a TRANSMITTER and a RECEIVER using a Clock signal  
(SCL) and a Data signal (SDA). Additionally there are up to three  
Address signals (A2, A1 and A0) which collectively serve as chip  
select signalto a device (e.g. EEPROM) on the bus.  
In addition to selecting an EEPROM, these 3 bits are also used to  
select a page blockwithin the selected EEPROM. Each page  
blockis512Kbit(64KBytes)insize. IfanEEPROMcontainsmore  
than one page bock then the selection of a page block within the  
EEPROM is by using A2, A1 and A0 bits.  
All communication on the IIC bus must be started with a valid  
START condition (by a MASTER), followed by transmittal (by the  
MASTER) of byte(s) of information (Address/Data). For every  
byte of information received, the addressed RECEIVER provides  
a valid ACKNOWLEDGE pulse to further continue the communi-  
cation unless the RECEIVER intends to discontinue the commu-  
nication. Depending on the direction of transfer (Write or Read),  
the RECEIVER can be a SLAVE or the MASTER. A typical IIC  
communication concludes with a STOP condition (by the MAS-  
TER).  
Read/Write Bit  
Last bit of the Slave Address indicates if the intended access is  
Read or Write. If the bit is "1," then the access is Read, whereas  
if the bit is "0," then the access is Write.  
Acknowledge  
Acknowledge is an active LOW pulse on the SDA line driven by an  
addressed receiver to the addressing transmitter to indicate  
receipt of 8-bits of data. The receiver provides an ACK pulse for  
every 8-bits of data received. This handshake mechanism is done  
as follows: After transmitting 8-bits of data, the transmitter re-  
leases the SDA line and waits for the ACK pulse. The addressed  
receiver, if present, drives the ACK pulse on the SDA line during  
the 9th clock and releases the SDA line back (to the transmitter).  
Refer Figure 3.  
Addressing an EEPROM memory location involves sending a  
command string with the following information:  
[DEVICE TYPE][DEVICE/PAGE BLOCK SELECTION][R/W  
BIT][ARRAY ADDRESS#1][ARRAY ADDRESS#0]  
Slave Address  
Slave Address is an 8-bit information consisting of a Device type  
field (4bits), Device/Page block selection field (3bits) and Read/  
Write bit (1bit).  
Array Address#1  
This is an 8-bit information containing the most significant 8-bits of  
16-bit memory array address of a location to be selected within a  
page block of the device.  
Slave Address Format  
Array Address#0  
Device Type  
Identifier  
Device/Page Block  
Selection  
This is an 8-bit information containing the least significant 8-bits of  
16-bit memory array address of a location to be selected within a  
page block of the device.  
1
0
1
0
A2  
A1  
A0 R/W (LSB)  
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FM24C32U Rev. A.1  
Pin Descriptions  
Device Operation  
The FM24C32U supports a bi-directional bus oriented protocol.  
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 FM24C32U will be considered a slave  
in all applications.  
Serial Clock (SCL)  
The SCL input is used to clock all data into and out of the device.  
Serial Data (SDA)  
SDA is a bi-directional 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.  
Write Protect (WP)  
Clock and Data Conventions  
If tied to V , PROGRAM operations onto the upper half (upper  
CC  
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 Figure 1.  
16Kbits)ofthememorywillnotbeexecuted.READoperationsare  
possible. If tied to V , normal operation is enabled, READ/  
SS  
WRITE over the entire memory is possible.  
Start Condition  
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.  
All commands are preceded by the start condition, which is a  
HIGHtoLOWtransitionofSDAwhenSCLisHIGH.TheFM24C32U  
continuously monitors the SDA and SCL lines for the start condi-  
tion and will not respond to any command until this condition has  
been met. Refer Figure 2.  
This pin has an internal pull-down circuit. However, on systems  
where write protection is not required it is recommended that this  
Stop Condition  
pin is tied to VSS  
.
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 FM24C32U to place the device in the  
standby power mode. Refer Figure 2.  
Device Selection Inputs A2, A1 and A0 (as  
appropriate)  
These inputs collectively serve as chip selectsignal to an  
EEPROM when multiple EEPROMs are present on the same IIC  
bus. Hence these inputs should be connected to VCC or VSS in a  
unique manner to allow proper selection of an EEPROM amongst  
multiple EEPROMs. During a typical addressing sequence, every  
EEPROM on the IIC bus compares the configuration of these  
inputs to the respective 3 bit Device/Page block selection”  
information (part of slave address) to determine a valid selection.  
For e.g. if the 3 bit Device/Page block selectionis 1-0-1, then the  
EEPROM whose Device Selection inputs(A2, A1 and A0) are  
connected to VCC-VSS-VCC respectively, is selected.  
FM24C32U Array Addressing  
During Read/Write operations, addressing the EEPROM memory  
array involves in providing 2 address bytes, Word Address 1and  
Word Address 0." However on FM24C32U only the 4 least  
significant bits (LSB) of Word Address 1byte are used in  
decoding the access location. The remaining 4 bits are not used  
and are recommended to be set to 0. All 8 bits of the Word  
Address 0byte are used in decoding the access location.  
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FM24C32U Rev. A.1  
Data Validity (Figure 1)  
SCL  
SDA  
DATA STABLE  
DATA  
CHANGE  
Start and Stop Definition (Figure 2)  
SCL  
SDA  
START  
STOP  
CONDITION  
CONDITION  
Acknowledge Response from Receiver (Figure 3)  
SCL FROM  
MASTER  
1
8
9
DATA OUTPUT  
FROM  
TRANSMITTER  
t
DH  
t
AA  
DATA OUTPUT  
FROM  
RECEIVER  
START  
CONDITION  
ACKNOWLEDGE  
PULSE  
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FM24C32U Rev. A.1  
Page Write is initiated in the same manner as the Byte Write  
operation; but instead of terminating the cycle after transmitting  
the first data byte, the master can further transmit up to 31 more  
bytes. After the receipt of each byte, FM24C32U will respond with  
an acknowledge pulse, increment the internal address counter to  
thenextaddress,andisreadytoacceptthenextdata.Ifthemaster  
should transmit more than 32 bytes prior to generating the STOP  
condition, the address counter will roll overand previously  
loaded data will be re-loaded. As with the Byte Write operation, all  
inputs are disabled until completion of the internal write cycle.  
Refer Figure 5 for the address, acknowledge, and data transfer  
sequence.  
Write Operations  
BYTE WRITE  
For byte write operation, two bytes of address are required after  
the slave address. These two bytes select 1 out of the 4096  
locations in the memory. The master provides these two address  
bytes and for each address byte received, FM24C32U responds  
with an acknowledge pulse. Master then provides a byte of data  
tobewrittenintothememory.Uponreceiptofthisdata,FM24C32U  
respondswithanacknowledgepulse. Themasterthenterminates  
the transfer by generating a stop condition, at which time the  
FM24C32U begins the internal write cycle to the memory. While  
the internal write cycle is in progress the FM24C32U inputs are  
disabled, and the device will not respond to any requests from the  
master for the duration of tWR. Refer Figure 4 for the address,  
acknowledge and data transfer sequence.  
Acknowledge Polling  
Once the stop condition is issued to indicate the end of the hosts  
write operation, the FM24C32U initiates the internal write cycle.  
ACKpollingcanbeinitiatedimmediately. Thisinvolvesissuingthe  
start condition followed by the slave address for a write operation.  
If the FM24C32U is still busy with the write operation, no ACK will  
be returned. If the FM24C32U has completed the write operation,  
an ACK will be returned and the host can then proceed with the  
next read or write operation.  
PAGE WRITE  
To minimize write cycle time, FM24C32U offers Page Write  
feature, which allows simultaneous programming of up to 32  
contiguous bytes. To facilitate this feature, the memory array is  
organized in terms of Pages. A Page consists of 32 contiguous  
byte locations starting at every 32-Byte address boundary (for  
example, starting at array address 0x0000, 0x0020, 0x0040 etc.).  
Page Write operation is confined to a single page. In other words  
a Page Write operation will not cross over to locations on the next  
page but will roll overto the beginning of the same page  
whenever end of page is reached and additional data bytes are a  
continued to be provided. A Page Write operation can be initiated  
tobeginatanylocationwithinapage(startingaddressofthePage  
Write operation need not be the starting address of a Page).  
Write Protection  
Programmingoftheupperhalf(upper8Kbit)ofthememorywillnot  
take place if the WP pin of the FM24C32U is connected to V  
.
CC  
The FM24C32U will respond to slave and byte addresses; but if  
the memory accessed is write protected by the WP pin, the  
FM24C32U will not generate an acknowledge after the first byte  
of data has been received. Thus the program cycle will not be  
started when the stop condition is asserted.  
Byte Write (Figure 4)  
S
Page Write (Figure 5)  
S
SLAVE  
ADDRESS  
WORD  
ADDRESS (1)  
WORD  
ADDRESS (0)  
DATA  
T
A
R
T
T
O
P
Bus Activity:  
Master  
SDA Line  
A
C
K
A
C
K
A
C
K
A
C
K
Bus Activity:  
EEPROM  
S
S
T
O
P
SLAVE  
ADDRESS  
WORD  
ADDRESS (1)  
WORD  
ADDRESS (0)  
DATA n  
DATA n+31  
T
A
R
T
Bus Activity:  
Master  
SDA Line  
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
Bus Activity:  
EEPROM  
10  
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FM24C32U Rev. A.1  
will not acknowledge the transfer but does generate the stop  
condition, and therefore the FM24C32U discontinues transmis-  
sion. Refer Figure 7 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.  
Sequential Read  
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 FM24C32U continues to output data for each acknowl-  
edgereceived. Thereadoperationisterminatedbythemasternot  
responding with an acknowledge or by generating a stop condi-  
tion.  
Current Address Read  
Internally the FM24C32U 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  
"1," the FM24C32U issues an acknowledge and transmits the  
eight bit word. The master will not acknowledge the transfer but  
does generate a stop condition, and therefore the FM24C32U  
discontinues transmission. Refer Figure 6 for the sequence of  
address, acknowledge and data transfer.  
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" to the  
beginning of the memory. FM24C32U continues to output data for  
each acknowledge received. Refer Figure 8 for the address,  
acknowledge, and data transfer sequence.  
Random Read  
Random read operations allow the master to access any memory  
location in a random manner. Prior to issuing the slave address  
with the R/W bit set to "1," the master must first perform a  
dummywrite operation. The master issues the start condition,  
slave address with the R/W bit set to "0" and then the byte  
address. After the byte address acknowledge, the master imme-  
diately issues another start condition and the slave address with  
the R/W bit set to one. This will be followed by an acknowledge  
from the FM24C32U and then by the eight bit word. The master  
Low VCC WRITE Lockout  
FM24C32U -Hversion offers low VCC write lockout feature to  
safeguard data whenever Vcc falls below 3.8V. Normally, the  
operating VCC for FM24C32U Hversion is 5V. However during  
system operation if the VCC reaches below 3.8V, then internally all  
write commands to the array are locked out.  
Current Address Read (Figure 6)  
S
T
A
R
T
S
T
O
P
SLAVE  
ADDRESS  
Bus Activity:  
Master  
1 0 1  
0
1
SDA Line  
A
C
K
NO  
A
C
K
Bus Activity:  
EEPROM  
DATA  
Random Read (Figure 7)  
S
T
A
R
T
S
S
T
O
P
T
A
R
T
SLAVE  
ADDRESS  
WORD  
ADDRESS (1)  
WORD  
ADDRESS (0)  
SLAVE  
ADDRESS  
Bus Activity:  
Master  
DATA  
0
1
SDA Line  
A
C
K
A
C
K
A
C
K
A
C
K
NO  
Bus Activity:  
EEPROM  
A
C
K
Sequential Read (Figure 8)  
S
T
O
P
A
C
K
A
C
K
A
C
K
Bus Activity:  
Slave  
Master  
Address  
SDA Line  
A
C
K
NO  
DATA n +1  
DATA n +1  
DATA n + 2  
DATA n + x  
A
C
K
Bus Activity:  
EEPROM  
11  
www.fairchildsemi.com  
FM24C32U Rev. A.1  
Physical Dimensions inches (millimeters) unless otherwise noted  
0.189 - 0.197  
(4.800 - 5.004)  
8
7
6
3
5
4
0.228 - 0.244  
(5.791 - 6.198)  
1
2
Lead #1  
IDENT  
0.150 - 0.157  
(3.810 - 3.988)  
0.053 - 0.069  
(1.346 - 1.753)  
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  
0.004  
(0.102)  
All lead tips  
0.0075 - 0.0098  
(0.190 - 0.249)  
Typ. All Leads  
0.014  
(0.356)  
0.016 - 0.050  
(0.406 - 1.270)  
Typ. All Leads  
0.050  
(1.270)  
Typ  
0.014 - 0.020  
Typ.  
(0.356 - 0.508)  
8-Pin Molded Small Outline Package (M8)  
Package Number M08A  
12  
www.fairchildsemi.com  
FM24C32U Rev. A.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
3
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
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  
Fax: +852-2722-8383  
4F, Natsume Bldg.  
Deutsch  
English  
Français  
Italiano  
+49 (0) 8141-6102-0  
+44 (0) 1793-856856  
+33 (0) 1-6930-3696  
+39 (0) 2-249111-1  
2-18-6, Yushima, Bunkyo-ku  
Tokyo, 113-0034 Japan  
Tel: 81-3-3818-8840  
Fax: 81-3-3818-8841  
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.  
13  
www.fairchildsemi.com  
FM24C32U Rev. A.1  

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