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Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
1024x8 bit electrically erasable PROM
BR24L08-W / BR24L08F-W / BR24L08FJ-W / BR24L08FV-W / BR24L08FVM-W
The BR24L08-W series is 2-wire (I2C BUS type) serial EEPROMs which are electrically programmable.
I C BUS is a registered trademark of Philips.
2
Applications General purpose Features 1) 1024 registers x 8 bits serial architecture. 2) Single power supply (1.8V to 5.5V). 3) Two wire serial interface. 4) Self-timed write cycle with automatic erase. 5) 16byte Page Write mode. 6) Low power consumption. Write (5V) : 1.5mA (Typ.) Read (5V) : 0.2mA (Typ.) Standby (5V) : 0.1A (Typ.) 7) DATA security Write protect feature (WP pin). Inhibit to WRITE at low VCC. 8) Small package - - - DIP8 / SOP8 / SOP-J8 / SSOP-B8 / MSOP-8 9) High reliability EEPROM with Double-Cell structure. 10) High reliability fine pattern CMOS technology. 11) Endurance : 1,000,000 erase / write cycles 12) Data retention : 40 years 13) Filtered inputs in SCL*SDA for noise suppression. 14) Initial data FFh in all address. Absolute maximum ratings (Ta=25C)
Parameter Supply voltage Symbol VCC Limits -0.3 to +6.5 800(DIP8) 450(SOP8) Power dissipation Pd 450(SOP-J8) 300(SSOP-B8) 310(MSOP8) Storage temperature Operating temperature Terminal voltage
1 2 3 4
Unit V
1 2 2 3 4
mW
Tstg Topr -
-65 to +125 -40 to +85 -0.3 to VCC+0.3
C C
V
Reduced by 8.0mW for each increase in Ta of 1C over 25C. Reduced by 4.5mW for each increase in Ta of 1C over 25C. Reduced by 3.0mW for each increase in Ta of 1C over 25C. Reduced by 3.1mW for each increase in Ta of 1C over 25C.
1/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
Symbol VCC VIN Limits 1.8 to 5.5 0 to VCC Unit V V
Recommended operating conditions (Ta=25C)
Parameter Supply voltage Input voltage
DC operating characteristics (Unless otherwise specified Ta=-40 to 85C, VCC=1.8 to 5.5V)
Parameter "HIGH" input volatge 1 "LOW" input volatge 1 "HIGH" input volatge 2 "LOW" input volatge 2 "LOW" output volatge 1 "LOW" output volatge 2 Input leakage current Output leakage current Symbol VIH1 VIL1 VIH2 VIL2 VOL1 VOL2 ILI ILO ICC1 Operating current ICC2 Standby current ISB - - - - 0.5 2.0 mA A Min. 0.7VCC - 0.8VCC - - - -1 -1 - Typ. - - - - - - - - - Max. - 0.3VCC - 0.2VCC 0.4 0.2 1 1 2.0 Unit V V V V V V A A mA Conditions 2.5VVCC5.5V 2.5VVCC5.5V 1.8VVCC<2.5V 1.8VVCC<2.5V IOL=3.0mA, 2.5VVCC5.5V, (SDA) IOL=0.7mA, 1.8VVCC5.5V, (SDA) VIN=0V to VCC VOUT=0V to VCC VCC=5.5V, fSCL=400kHz, tWR=5ms, Byte Write, Page Write VCC=5.5V, fSCL=400kHz Random Read, Current Read, Sequential Read VCC=5.5V, SDA*SCL=VCC, A0, A1, A2=GND, WP=GND
This product is not designed for protection against radioactive rays.
2/25
Memory ICs
Dimension
9.30.3 8 5
6.50.3
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
5.00.2
8 5
1
0.51Min.
4 7.62
6.20.3 4.40.2
1
4
1.50.1 0.11
3.40.3
0.150.1 0.1
3.20.2
0.30.1
1.27 0.40.1
2.54
0.50.1
0 ~ 15
Fig.1(a) PHYSICAL DIMENSION (Units : mm) DIP8 (BR24L08-W)
Fig.1(b) PHYSICAL DIMENSION (Units : mm) SOP8 (BR24L08F-W)
4.90.2
0.45Min. 6.00.3 3.90.2
6.40.3 4.40.2
8765
3.00.2
8 5
1
4
1.3750.1 0.175
1.150.1 0.1
1234
0.150.1 0.1
0.20.1 0.1
1.27 0.420.1
0.220.1 0.65
(0.52)
Fig.1(c) PHYSICAL DIMENSION (Units : mm) SOP-J8 (BR24L08FJ-W)
Fig.1(d) PHYSICAL DIMENSION (Units : mm) SSOP-B8 (BR24L08FV-W)
2.90.1
8 5
4.00.2
2.80.1
1
4
0.475
0.9Max. 0.750.05 0.080.05
0.22-0.04 0.65 0.08 S
+0.05
0.290.15 0.60.2
+0.05 0.145-0.03
0.08 M
Fig.1(e) PHYSICAL DIMENSION (Units : mm) MSOP8 (BR24L08FVM-W)
0.3Min.
0.3Min.
3/25
Memory ICs
Block diagram
A0
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
1
10bit
32kbit EEPROM array 8bit 10bit Slave word address register
STOP
8
VCC
A1
2
Address decoder
Data register
7
WP
A2
3
START
Control logic ACK
6
SCL
GND
4
High voltage generator
Vcc level detect
5
SDA
Fig.2 BLOCK DIAGRAM
Pin configuration
VCC
WP
SCL
SDA
8
7
6
5
BR24L08-W BR24L08F-W BR24L08FJ-W BR24L08FV-W BR24L08FVM-W
1
A0
2
A1
3
A2
4
GND
Fig.3 PIN LAYOUT
Pin name
Pin name
VCC GND A0, A1 A2 SCL SDA
I/O - - - IN IN IN / OUT IN
Power supply Ground (0V) Out of use
Function
Slave address set Serial clock input Slave and word address, serial data input, serial data output Write protect input
1
WP
1 An open drain output requires a pull-up resistor.
4/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
Fast-mode 2.5V Vcc 5.5V Min. Typ. - - - - - - - - - - - - - - - - - - Max. 400 - - 0.3 0.3 - - - - 0.9 - - - 5 0.1 - - - - 0.6 1.2 - - 0.6 0.6 0 100 0.1 0.1 0.6 1.2 - - 0 0.1 1.0 Standard-mode 1.8V Vcc 5.5V Min. - 4.0 4.7 - - 4.0 4.7 0 250 0.2 0.2 4.7 4.7 - - 0 0.1 1.0 Typ. - - - - - - - - - - - - - - - - - - Max. 100 - - 1.0 0.3 - - - - 3.5 - - - 5 0.1 - - - kHz s s s s s s ns ns s s s s ms s ns s s
AC operating characteristics (Unless otherwise specified Ta=-40 to 85C, VCC=1.8 to 5.5V)
Parameter Clock frequency Data clock "HIGH" period Data clock "LOW" period SDA and SCL rise time SDA and SCL fall time Start condition hold time Start condition setup time Input data hold time Input data setup time Output data delay time Output data hold time Stop condition setup time Bus free time Write cycle time Noise spike width (SDA and SCL) WP hold time WP setup time WP high period
1 Not 100% tested. 1 1
Symbol fSCL tHIGH tLOW tR tF
Unit
tHD:STA tSU:STA tHD:DAT tSU:DAT
tPD
tDH tSU:STO
tBUF tWR tl
tHD:WP tSU:WP tHIGH:WP
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Memory ICs
Synchronous data timing
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
tR tF tHIGH
SCL tHD : STA SDA (IN) tBUF SDA (OUT) tPD tDH tSU : DAT tLOW tHD : DAT
SCL tSU : STA SDA tHD : STA tSU : STO
START BIT
STOP BIT
Fig.4 SYNCHRONOUS DATA TIMING
*SDA data is latched into the chip at the rising edge of SCL clock. *Output data toggles at the falling edge of SCL clock.
Write cycle timing
SCL
SDA
D0
WRITE DATA (n)
ACK tWR
STOP CONDITION START CONDITION
Fig.5 WRITE CYCLE TIMING
6/25
Memory ICs
WP timing
SCL
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
DATA (1) D1
DATA (n)
SDA
D0
ACK
ACK tWR STOP BIT
WP
tSU : WP
tHD : WP
Fig.6(a) WP TIMING OF THE WRITE OPERATION
SCL
DATA (1) D1
DATA (n)
SDA
D0
ACK
ACK
tHIGH : WP
WP
Fig.6(b) WP TIMING OF THE WRITE CANCEL OPERATION
*For the WRITE operation, WP must be "LOW" during the period of time from the rising edge of the clock which takes in D0 of first byte until the end of tWR. ( See Fig.6 (a) ) During this period, WRITE operation is canceled by setting WP "HIGH". ( See Fig.6 (b) ) *In the case of setting WP "HIGH" during tWR, WRITE operation is stopped in the middle and the data of accessing address is not guaranteed. Please write correct data again in the case.
7/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
Device operation 1) Start condition (Recognition of start bit) * All commands are proceeded by the start condition, which is a HIGH to LOW transition of SDA when SCL is HIGH. * The device continuously monitors the SDA and SCL lines for the start condition and will not respond to any command until this condition has been met. (See Fig.4 SYNCHRONOUS DATA TIMING) 2) Stop condition (Recognition of stop bit) * All communications must be terminated by a stop condition, which is a LOW to HIGH transition of SDA when SCL is HIGH. (See Fig.4 SYNCHRONOUS DATA TIMING) 3) Notice about write command * In the case that stop condition is not executed in WRITE mode, transferred data will not be written in a memory. 4) Device addressing * Following a START condition, the master output the slave address to be accessed. * The most significant four bits of the slave address are the "device type identifier", for this device it is fixed as "1010". * The next bit (device address) identify the specified device on the bus. The device address is defined by the state of A2 input pin. This IC works only when the device address inputted from SDA pin correspond to the state of A2 input pin. Using this address scheme, up to two devices may be connected to the bus. * The next two bits (P1, P0) are used by the master to select t four 256 word page of memory. P1, P0 set to "0" "0" - - - - - - 1page (000 to 0FF) P1, P0 set to "0" "1" - - - - - - 2page (100 to 1FF) P1, P0 set to "1" "0" - - - - - - 3page (200 to 2FF) P1, P0 set to "1" "1" - - - - - - 4page (300 to 3FF) * The last bit of the stream (R/W - - - READ / WRITE) determines the operation to be performed. When set to "1", a read operation is selected ; when set to "0", a write operation is selected. R / W set to "0" - - - - - - WRITE (including word address input of Random Read) R / W set to "1" - - - - - - READ
1010
A2
P1
P0
R/W
5) Write protect (WP) When WP pin set to VCC (H level), write protect is set for 1024 words (all address). When WP pin set to GND (L level), enable to write 1024 words (all address). Either control this pin or connect to GND (or VCC). It is inhibited from being left unconnected.
8/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
6) Acknowledge * Acknowledge is a software convention used to indicate successful data transfers. The transmitter device will release the bus after transmitting eight bits. (When inputting the slave address in the write or read operation, transmitter is -COM. When outputting the data in the read operation, it is this device.) * During the ninth clock cycle, the receiver will pull the SDA line LOW to acknowledge that the eight bits of data has been received. (When inputting the slave address in the write or read operation, receiver is this device. When outputting the data in the read operation, it is -COM.) * The device will respond with an Acknowledge after recognition of a START condition and its slave address (8bit). * In the WRITE mode, the device will respond with an Acknowledge, after the receipt of each subsequent 8-bit word (word address and write data). * In the READ mode, the device will transmit eight bit of data, release the SDA line, and monitor the line for an Acknowledge. * If an Acknowledge is detected, and no STOP condition is generated by the master, the device will continue to transmit the data. If an Acknowledge is not detected, the device will terminate further data transmissions and await a STOP condition before returning to the standby mode. (See Fig.7 ACKNOWLEDGE RESPONSE FROM RECEIVER)
START CONDITION
(START BIT)
SCL
(From -COM)
1
8
9
SDA
(-COM OUTPUT DATA)
SDA
(IC OUTPUT DATA)
Acknowledge Signal (ACK Signal)
Fig.7 ACKNOWLEDGE RESPONSE FROM RECEIVER
9/25
Memory ICs
Byte write
S T A R T SDA LINE
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
SLAVE ADDRESS
W R I T E
WA 7
WORD ADDRESS
WA 0
DATA
S T O P
1 0 1 0 A2 P1 P0
D7
D0
RA /C WK
A C K
A C K
WP
Fig.8 BYTE WRITE CYCLE TIMING
* By using this command, the data is programmed into the indicated word address. * When the master generates a STOP condition, the device begins the internal write cycle to the nonvolatile memory array.
Page write
S T A R T W R I T E
SLAVE ADDRESS
WORD ADDRESS (n)
DATA (n)
DATA (n+15)
S T O P
SDA LINE
1 0 1 0 A2 P1 P0
WA 7
WA 0
D7
D0
D0
RA /C WK
A C K
A C K
A C K
WP
Fig.9 PAGE WRITE CYCLE TIMING
* This device is capable of sixteen byte Page Write operation. * When two or more byte data are inputted, the four low order address bits are internally incremented by one after the receipt of each word. The six higher order bits of the address (P1, P0, WA7 to WA4) remain constant. * If the master transmits more than sixteen words, prior to generating the STOP condition, the address counter will "roll over", and the previous transmitted data will be overwritten.
10/25
Memory ICs
Current read
S T A R T SDA LINE
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
SLAVE ADDRESS
R E A D
DATA
S T O P
1
0
1
0 A2 P1 P0
D7
D0
RA /C WK Fig.10 CURRENT READ CYCLE TIMING
A C K
* In case that the previous operation is Random or Current Read (which includes Sequential Read respectively), the internal address counter is increased by one from the last accessed address (n). Thus Current Read outputs the data of the next word address (n+1). If the last command is Byte or Page Write, the internal address counter stays at the last address (n). Thus Current Read outputs the data of the word address (n). * If an Acknowledge is detected, and no STOP condition is generated by the master (-COM), the device will continue to transmit the data. [ It can transmit all data (8kbit 1024word) ] * If an Acknowledge is not detected, the device will terminate further data transmissions and await a STOP condition before returning to the standby mode. Note) If an Acknowledge is detected with "Low" level, not "High" level, command will become Sequential Read. So the device transmits the next data, Read is not terminated. In the case of terminating Read, input Acknowledge with "High" always, then input stop condition. Random read
S T A R T SDA LINE
SLAVE ADDRESS
W R I T E
WA 7
WORD ADDRESS(n)
WA 0
S T A R T
SLAVE ADDRESS
R E A D
DATA(n)
S T O P
1 0 1 0 A2P1P0
1 0 1 0 A2A1PS
D7
D0
RA /C WK
A C K
RA /C WK
A C K
Fig.11 RANDOM READ CYCLE TIMING
* Random read operation allows the master to access any memory location indicated word address. * If an Acknowledge is detected, and no STOP condition is generated by the master (-COM), the device will continue to transmit the data. [ It can transmit all data (8kbit 1024word) ] * If an Acknowledge is not detected, the device will terminate further data transmissions and await a STOP condition before returning to the standby mode. Note) If an Acknowledge is detected with "Low" level, not "High" level, command will become Sequential Read. So the device transmits the next data, Read is not terminated. In the case of terminating Read, input Acknowledge with "High" always, then input stop condition.
11/25
Memory ICs
Sequential read
S T A R T SDA LINE
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
SLAVE ADDRESS
R E A D
DATA(n)
DATA(n+x)
S T O P
1 0 1 0 A2 P1 P0
D7
D0
D7
D0
RA /C WK
A C K
A C K
A C K
Fig.12 SEQUENTIAL READ CYCLE TIMING (Current Read)
* If an Acknowledge is detected, and no STOP condition is generated by the master (-COM), the device will continue to transmit the data. [ It can transmit all data (8kbit 1024word) ] * If an Acknowledge is not detected, the device will terminate further data transmissions and await a STOP condition before returning to the standby mode. * The Sequential Read operation can be performed with both Current Read and Random Read. Note) If an Acknowledge is detected with "Low" level, not "High" level, command will become Sequential Read. So the device transmits the next data, Read is not terminated. In the case of terminating Read, input Acknowledge with "High" always, then input stop condition.
12/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
Application 1) WP effective timing WP is fixed to "H" or "L" usually. But in case of controlling WP to cancel the write command, please pay attention to [ WP effective timing ] as follows. During write command input, write command is canceled by controlling WP "H" within the WP cancellation effective period. The period from the start condition to the rising edge of the clock which take in D0 of the data (the first byte of the data for Page Write) is the cancellation invalid period. WP input is don't care during the period. Setup time for rising edge of the SCL which takes in D0 must be more than 100ns. The period from the rising edge of SCL which takes in D0 to the end of internal write cycle (tWR) is the cancellation effective period. In case of setting WP to "H" during tWR, WRITE operation is stopped in the middle and the data of accessing address is not guaranteed, so that write correct data again please. It is not necessary waiting tWR (5msmax.) after stopping command by WP, because the device is stand by state.
* The rising edge of the clock which take in D0 SCL SCL * The rising edge of SDA D0 ACK
SDA
D1
D0
ACK
SDA
AN ENLARGEMENT
AN ENLARGEMENT
SDA
S T A R T
SLAVE ADDRESS
A C K L
WORD ADDRESS
A C K L
D7
D6
D5
D4
D3
D2
D1
D0
A C K L
DATA
A C K L
A C K L
S T O P
tWR
WP cancellation invalid period WP
WP cancellation effective period
Stop of the write operation Data is not guaranteed
No data will be written
Fig.13 WP EFFECTIVE TIMING
13/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
2) Software reset Please execute software reset in case that the device is an unexpected state after power up and / or the command input need to be reset. There are some kinds of software reset. Here we show three types of example as follows. During dummy clock, please release SDA bus (tied to VCC by pull up resistor). During that time, the device may pull the SDA line LOW for Acknowledge or outputting or read data. If the master controls the SDA line HIGH, it will conflict with the device output LOW then it makes a current overload. It may cause instantaneous power down and may damage the device.
DUMMY CLOCK x 14 START x 2
SCL
1
2
13
14
COMMAND
SDA
COMMAND
Fig.14-(a) DUMMY CLOCK x 14 + START + START
START
DUMMY CLOCK x 9
START
SCL
1
2
8
9
COMMAND
SDA
COMMAND
Fig.14-(b) START+ DUMMY CLOCK x 9 + START
START x 9
SCL
1
2
3
7
8
9
COMMAND
SDA
COMMAND
Fig.14-(c) START x 9
COMMAND starts with start condition.
14/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
3) Acknowledge polling Since the device ignore all input commands during the internal write cycle, no ACK will be returned. When the master send the next command after the write command, if the device returns the ACK, it means that the program is completed. If no ACK id returned, it means that the device is still busy. By using Acknowledge polling, the waiting time is minimized less than tWR=5ms. In case of operating Write or Current Read right after Write, first, send the slave address (R / W is "HIGH" or "LOW" respectively). After the device returns the ACK, continue word address input or data output respectively.
THE FIRST WRITE COMMAND
During the internal write cycle, no ACK will be returned. (ACK=HIGH)
S T A R T
WRITE COMMAND
S T O P
S T A R T
SLAVE ADDRESS
A C K H
S T A R T
SLAVE ADDRESS
A C K H
***
tWR
THE SECOND WRITE COMMAND
***
S T A R T
SLAVE ADDRESS
A C K H
S T A R T
SLAVE ADDRESS
A C K L
WORD ADDRESS
A C K L
DATA
A C K L
S T O P
tWR After the internal write cycle is completed ACK will be returned (ACK=LOW). Then input next Word Address and data.
Fig.15 SUCCESSIVE WRITE OPERATION BY ACKNOWLEDGE POLLING
15/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
4) Command cancellation by start and stop condition During a command input, it is canceled by the successive inputs of start condition and stop condition. (Fig.4) But during ACK or data output, the device may output the SDA line LOW. In such cases, operation of start and stop condition is impossible, so that the reset can't work. Execute the software reset in the cases. (See Page14) Operating the command cancel by start and stop condition during the command of Random Read or Sequential Read or Current Read, internal address counter is not confirmed. Therefore operation of Current Read after this in not valid. Operate a Random Read in this case.
SCL
SDA
1
0
1
0
START CONDITION
STOP CONDITION
Fig.16 COMMAND CANCELLATION BY START AND STOP CONDITION DURING THE INPUT OF SLAVE ADDRESS
16/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
5) Notes for power supply VCC rises through the low voltage region in which internal circuit of IC and the controller are unstable, so that device may not work properly due to an incomplete reset of internal circuit. To prevent this, the device has the feature of P.O.R. and LVCC. In the case of power up, keep the following conditions to ensure functions of P.O.R and LVCC. (1) It is necessary to be "SDA=`H' " and "SCL='L' or `H' ". (2) Follow the recommended conditions of tR, tOFF, Vbot for the function of P.O.R. durning power up.
tR VCC Recommended conditions of tR, tOFF, Vbot tR tOFF 0 VCC rising wave from Below 10ms Vbot Below 100ms tOFF Above 10ms Above 10ms Vbot Below 0.3V Below 0.2V
(3) Prevent SDA and SCL from being "Hi-Z". In case that condition 1. and / or 2. cannot be met, take following actions. A) Unable to keep condition 1. (SDA is "LOW" during power up.) Control SDA, SCL to be "HIGH" as figure below.
VCC tLOW SCL
SDA After VCC becomes stable tDH tSU:DAT After VCC becomes stable tSU:DAT
a) SCL="H" and SDA="L"
b) SCL="L" and SDA="L"
B) Unable to keep condition 2. After power becomes stable, execute software reset. (See Page14 ) C) Unable to keep condition 1 and 2. Follow the instruction A first, then the instruction B.
* LVCC circuit LVCC circuit inhibit write operation at low voltage, and prevent an inadvertent write. Below the LVCC voltage (Typ.=1.2V), write operation is inhibited.
17/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
6) I / O circuit * Pull up resister of SDA pin The pull up resister is needed because SDA is NMOS open drain. Decide the value of this resister (RPU) properly, by considering VIL, IL characteristics of a controller which control the device and VOH, IOL characteristics of the device. If large RPU is chosen, clock frequency need to be slow. In case of small RPU, the operating current increases. * Maximum of RPU Maximum of RPU is determined by following factor. SDA rise time determined by RPU and the capacitance of bus line (CBUS) must be less than TR. And the other timing must keep the conditions of AC spec. When SDA bus is HIGH, the voltage A of SDA bus determined by a total input leak (IL) of the all devices connected to the bus and RPU must be enough higher than input HIGH level of a controller and the device, including noise margin 0.2VCC.
VCC - ILRPU - 0.2VCC VIH
MICRO COMPUTER BR24LXX RPU
RPU
0.8VCC - VIH IL
A
SDA PIN
IL
IL
Examples : When VCC=3V IL=10A VIH=0.7VCC According to 2 RPU 0.8x3-0.7x3 10x10-6
THE CAPACITANCE OF BUS LINE (CBUS)
300 [k]
18/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
* The minimum value RPU The minimum value of RPU is determined by following factors. Meet the condition that VOLMAX=0.4V, IOLMAX=3mA when the device output low on SDA line.
VCC - VOL IOL RPU RPU VCC - VOL IOL
VOLMAX (=0.4V) must be lower than the input LOW level of the controller and the EEPROM including recommended noise margin (0.1VCC).
VOLMAX VIL - 0.1VCC Examples : VCC=3V, VOL=0.4V, IOL=3mA, the VIL of the controller and the EEPROM is VIL=0.3VCC According to 1 RPU 3-0.4 3x10-3
867 [] and VOL =0.4[V] VIL =0.3x3 =0.9[V]
so that condition 2 is met
* Pull up resister of SCL pin In the case that SCL is controlled by CMOS output, the pull up resister of SCL is not needed. But in the case that there is a timing at which SCL is Hi-Z, connect SCL to VCC with pull up resister. Several several dozen k is recommended as a pull up resister, which is considered with the driving ability of the output port of the controller.
7) Connections of A0, A1, A2, WP pin * Connections of device address pin (A0, A1, A2) The state of device address PIN are compared with the device address send by the master, then one of the devices which are connected to the identical bus is selected. Pull up or down these pins, or connect them to VCC or GND. Pins which is not used as device address (N.C. PIN) may be either HIGH, LOW, and Hi-Z. The type of the device which have N.C. PIN BR24L16 / F / FJ / FV / FVM-W BR24L08 / F / FJ / FV / FVM-W BR24L04 / F / FJ / FV / FVM-W A0, A1, A2 A0, A1 A0
* Connections of WP pin The WP input allows or inhibits write operations. When WP is HIGH, only READ is available and WRITE to any address is inhibited. Both Read and Write are available when WP is LOW. In the case that the device is used as a ROM, it is recommended that WP is pulled up or connected to VCC. In the case that both READ and WRITE are operated, WP pin must be pulled down or connected to GND or controlled.
19/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
8) Notes for noise on VCC * About bypass capacitor Noise and surges on power line may cause the abnormal function. It is recommended that the bypass capacitors (0.1F) are attached on the VCC and GND line beside the device. The attachment of bypass capacitors on the board near by connector is also recommended.
IC capacitor 0.01 to 0.1F
PRINT BASE
GND
VCC
capacitor 10 to 100F
9) The notice about the connection of controller * About RS The open drain interface is recommended for SDA port in I2C BUS. But, in the case that Tri-state CMOS interface is applied to SDA, insert a series resister RS between SDA pin of the device and a pull up resister RPU. It limits the current from PMOS of controller to NMOS of EEPROM. RS also protects SDA pin from surges. Therefore, RS is able to be used though SDA port is open drain.
RPU RS SDA PIN
CONTROLLER
EEPROM ACK
SCL
SDA "H" OUTPUT OF CONTROLLER "L" OUTPUT OF EEPROM
The "H" output of controller and the "L" output of EEPROM may cause current overload to SDA line.
20/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
* The maximum value of RS The maximum value of RS is determined by following factors. SDA rise time determined by RPU and the capacitance of bus line (CBUS ) of SDA must be less than tR. And the other timing must also keep the conditions of the AC timing. When the device outputs LOW on SDA line, the voltage of the bus A determined by RPU and RS must be lower than the inputs LOW level of the controller, including recommended noise margin (0.1VCC).
(VCC-VOL) x RS + VOL+0.1VCC VIL RPU+RS RS VIL-VOL-0.1VCC x RPU 1.1VCC-VIL
Examples : When VCC=3V, VIL=0.3VCC, VOL=0.4V, RPU=20k According to 2 RS 0.3x3-0.4-0.1x3 x 20x103 1.1x3-0.3x3
1.67 [k]
VCC
RPU
A
RS VOL
CAPACITANCE OF BUS LINE (CBUS)
VIL CONTROLLER EEPROM
* The minimum value of RS The minimum value of RS is determined by the current overload due to the conflict on the bus. The current overload may cause noise on the power line and instantaneous power down. The following conditions must be met, where is the maximum permissible current. The maximum permissible current depends on VCC line impedance and so on. It need to be less than 10mA for EEPROM.
VCC RS RS VCC
RPU RS "L" OUTPUT
Examples : When VCC=3V, =10mA RS 3 10x10-3
MAXIMUM CURRENT "H" OUTPUT
300 []
CONTROLLER
EEPROM
21/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
10) The special character DATA The following characteristic data are typ. value.
6
H INPUT VOLTAGE : VIH (V)
6 5 4 3 2 1
SPEC Ta=85C Ta=-40C Ta=25C
1
L OUTPUT VOLTAGE : VOL (V)
4
SPEC
L INPUT VOLTAGE : VIL (V)
5
0.8
0.6
Ta=25C
3 2 1 0 0
Ta=85C Ta=-40C Ta=25C
0.4
Ta=85C SPEC
0.2
Ta=-40C
1
2
3
4
5
6
0 0
1
2
3
4
5
6
0 0
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
L OUTPUT CURRENT : IOL (mA)
Fig.17 High input voltage VIH (A0,A1,A2,SCL,SDA,WP)
Fig.18 Low input voltage VIL (A2,SCL,SDA,WP)
Fig.19 Low output voltage VOL-IOL (VCC=1.8V)
1
INPUT LEAK CURRENT : ILI (A)
L OUTPUT VOLTAGE : VOL (V)
1.2 1 0.8 0.6 0.4 0.2 0 0
Ta=85C Ta=25C Ta=-40C
1.2
OUTPUT LEAK CURRENT : ILO (A)
SPEC SPEC
0.8
1 0.8 0.6 0.4 0.2 0 0
Ta=85C Ta=25C Ta=-40C
0.6
SPEC
0.4
Ta=25C Ta=85C
0.2
Ta=-40C
0 0
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
L OUTPUT CURRENT : IOL (mA)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.20 Low output voltage VOL-IOL (VCC=2.5V)
Fig.21 Input leakage current ILI (A2,SCL,WP)
Fig.22 Output leakage current ILO(SDA)
2.5
CURRENT CONSUMPTION AT READING : ICC2 (mA) CURRENT CONSUMPTION AT WRITING : ICC1 (mA)
SPEC
0.6
SPEC
2.5
CURRENT CONSUMPTION AT WRITING : ICC1 (mA)
SPEC
2
fSCL=400kHz DATA=AAh
0.5 0.4 0.3
Ta=85C Ta=25C fSCL=400kHz DATA=AAh
2
fSCL=100kHz DATA=AAh
1.5
Ta=25C Ta=85C Ta=-40C
1.5
Ta=25C Ta=85C Ta=-40C
1
1
0.2 0.1 0 0
Ta=-40C
0.5
0.5
0 0
1
2
3
4
5
6
1
2
3
4
5
6
0 0
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.23 Write operating current ICC1 (fSCL=400kHz)
Fig.24 Read operating current ICC2 (fSCL=400kHz)
Fig.25 Write operating current ICC1 (fSCL=100kHz)
22/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
2.5
SPEC
0.6
CURRENT CONSUMPTION AT READING : ICC2 (mA)
10000
SPEC
2
SCL FREQUENCY : fSCL (kHz)
0.5 0.4 0.3 0.2 0.1 0 0
Ta=85C Ta=25C fSCL=100kHz DATA=AAh
STANDBY CURRENT : ISB (A)
Ta=85C Ta=25C Ta=-40C
1000
SPEC1
1.5
100
SPEC2
1
0.5
Ta=85C Ta=25C Ta=-40C
10
Ta=-40C
1
2
3
4
5
6
0 0
1
2
3
4
5
6
1 0
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.26 Read operating current ICC2 (fSCL=100kHz)
Fig.27 Standby current ISB
Fig.28 Clock frequency fSCL
DATA CLK H TIME : tHIGH (s)
DATA CLK L TIME : tLOW (s)
SPEC2
SPEC2
START CONDITION HOLD TIME : tHD:STA (s)
5
5
5
SPEC2
4
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
4
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
4
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
3
3
3
2
Ta=-40C Ta=25C Ta=85C
2
SPEC1 Ta=85C Ta=25C Ta=-40C
2
Ta=-40C Ta=25C Ta=85C
1
SPEC1
1
1
SPEC1
0 0
1
2
3
4
5
6
0 0
1
2
3
4
5
6
0 0
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.29 Data clock "H" period tHIGH
Fig.30 Data clock "L" period tLOW
Fig.31 Start condition hold time tHD:STA
START CONDITION SET UP TIME : tSU:STA (s)
6
INPUT DATA HOLD TIME : tHD:DAT (ns)
50
SPEC2 SPEC1,2
50
INPUT DATA HOLD TIME : tHD:DAT (ns)
SPEC1,2
5 4 3 2
0
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
0
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
-50 -100 -150 -200 0
Ta=85C Ta=25C Ta=-40C
-50 -100 -150
Ta=25C Ta=-40C Ta=85C
SPEC1
1 0 0
Ta=-40C Ta=25C Ta=85C
1
2
3
4
5
6
1
2
3
4
5
6
-200 0
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.32 Start condition setup time tSU:STA
Fig.33 Input data hold time tHD:DAT(HIGH)
Fig.34 Input data hold time tHD:DAT(LOW)
23/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
300
SPEC2
INPUT DATA SET UP TIME : tSU:DAT (ns)
INPUT DATA SET UP TIME : tSU:DAT (ns)
300
SPEC2
4
OUTPUT DATA DELAY TIME : tPD (s)
SPEC2
200
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
200
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
3
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
SPEC1
SPEC1
100
100
Ta=85C
2
Ta=85C Ta=25C Ta=-40C
0 -100 -200 0
Ta=85C Ta=25C Ta=-40C
0 -100 -200 0
Ta=25C
Ta=-40C
1
SPEC2
SPEC1
1
2
3
4
5
6
1
2
3
4
5
6
0 0
SPEC1
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.35 Input data setup time tSU:DAT(HIGH)
Fig.36 Input data setup time tSU:DAT(LOW)
Fig.37 Output data delay time tPD0
4
OUTPUT DATA DELAY TIME : tPD (s) OUTPUT DATA HOLD TIME : tDH (s)
SPEC2
4
SPEC2
4
OUTPUT DATA HOLD TIME : tDH (s)
SPEC2
3
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
3
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
3
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
2
Ta=-40C Ta=25C Ta=85C
2
Ta=85C Ta=25C Ta=-40C
2
Ta=-40C Ta=25C Ta=85C
1
SPEC2
SPEC1
1
SPEC2
SPEC1
1
SPEC2
SPEC1
0 0
SPEC1
1
2
3
4
5
6
0 0
SPEC1
1
2
3
4
5
6
0 0
SPEC1
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.38 Output data delay time tPD1
Fig.39 Output data hold time tDH0
Fig.40 Output data hold time tDH1
STOP CONDITION SET UP TIME : tSU:STO (s)
5
BUS OPEN TIME BEFORE TRANSMISSION : tBUF (s)
SPEC2
5
SPEC2
6
INTERNAL WRITING CYCLE TIME : tWR (ms)
SPEC1,2
4
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
4
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
5 4 3
Ta=85C Ta=-40C
3
3
Ta=25C
2
2
SPEC1
2 1
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
1
Ta=85C Ta=25C Ta=-40C
SPEC1
1
Ta=-40C Ta=25C Ta=85C
0 0
1
2
3
4
5
6
0 0
1
2
3
4
5
6
0 0
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.41 Stop condition setup time tSU:STO
Fig.42 BUS free time tBUF
Fig.43 Write cycle time tWR
24/25
Memory ICs
BR24L08-W / BR24L08F-W / BR24L08FJ-W BR24L08FV-W / BR24L08FVM-W
0.6 0.5 0.4 0.3
Ta=-40C
0.6
NOISE REDUCTION EFFECTIVE TIME : tI (SCL H) (s)
0.6
NOISE REDUCTION EFFECTIVE TIME : tI (SDA H) (s)
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
0.5
Ta=-40C
NOISE REDUCTION EFFECTIVE TIME : tI (SCL L) (s)
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
0.5 0.4
Ta=-40C
0.4
Ta=25C
0.3
Ta=85C
0.3 0.2 0.1
Ta=25C Ta=85C
0.2 0.1
SPEC1,2
0.2 0.1
Ta=25C Ta=85C SPEC1,2
SPEC1,2
0 0
1
2
3
4
5
6
0 0
1
2
3
4
5
6
0 0
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.44 Noise spike width tI (SCL H)
Fig.45 Noise spike width tI (SCL L)
Fig.46 Noise spike width tI (SDA H)
0.6
NOISE REDUCTION EFFECTIVE TIME : tI (SDA L) (s)
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
0.2
WP EFFECTIVE TIME : tHIGH:WP (s)
WP SET UP TIME : tSU:WP (s)
1.2 1
SPEC1,2
0.5 0.4 0.3 0.2 0.1
SPEC1,2 Ta=-40C Ta=25C Ta=85C
SPEC1,2
0
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
0.8
SPEC1 : FAST-MODE SPEC2 : STANDARD-MODE
-0.2
Ta=85C
0.6 0.4 0.2 0 0
Ta=-40C Ta=25C Ta=85C
-0.4
Ta=25C
Ta=-40C
0 0
1
2
3
4
5
6
-0.6 0
1
2
3
4
5
6
1
2
3
4
5
6
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.47 Noise spike width tI (SDA L)
Fig.48 WP setup time tSU:WP
Fig.49 WP high period tHIGH:WP
25/25
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document use silicon as a basic material. Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0

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