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M
Device 24AA00 24LC00 24C00
24AA00/24LC00/24C00
PACKAGE TYPES
Temp Range C,I C,I C,I,E NC NC VSS 2 3 4 8-PIN PDIP/SOIC NC 1 24xx00 8 7 6 5 VCC NC SCL SDA
128 Bit I2CTM Bus Serial EEPROM
DEVICE SELECTION TABLE
VCC Range 1.8 - 6.0 2.5 - 6.0 4.5 - 5.5
FEATURES
* Low power CMOS technology - 500 A typical active current - 500 nA typical standby current * Organized as 16 bytes x 8 bits * 2-wire serial interface bus, I2CTM compatible * 100kHz (1.8V) and 400kHz (5V) compatibility * Self-timed write cycle (including auto-erase) * 4 ms maximum byte write cycle time * 1,000,000 erase/write cycles guaranteed * ESD protection > 4kV * Data retention > 200 years * 8L DIP, SOIC, TSSOP and 5L SOT-23 packages * Temperature ranges available: - Commercial (C): 0C to +70C - Industrial (I): -40C to +85C - Automotive (E) -40C to +125C
8-PIN TSSOP NC NC NC Vss 1 2 3 4 8 7 6 5 Vcc NC SCL SDA
24xx00
5-PIN SOT-23 SCL VSS SDA 1 2 3 5 VCC
24xx00
4
NC
DESCRIPTION
The Microchip Technology Inc. 24AA00/24LC00/24C00 (24xx00*) is a 128-bit Electrically Erasable PROM memory organized as 16 x 8 with a 2-wire serial interface. Low voltage design permits operation down to 1.8 volts for the 24xx00 version, and every version maintains a maximum standby current of only 1 A and typical active current of only 500 A. This device was designed where a small amount of EEPROM is needed for the storage of calibration values, ID numbers or manufacturing information, etc. The 24xx00 is available in 8ld PDIP, 8ld SOIC (150 mil), 8ld TSSOP and the 5ld SOT-23 packages.
BLOCK DIAGRAM
HV GENERATOR
I/O CONTROL LOGIC
MEMORY CONTROL LOGIC
XDEC
EEPROM ARRAY
SDA
SCL
YDEC
VCC VSS
SENSE AMP R/W CONTROL
*24xx00 is used in this document as a generic part number for the 24AA00/24LC00/24C00 devices. I2C is a trademark of Philips Corporation.
(c) 1996 Microchip Technology Inc.
Preliminary
DS21178A-page 1
24xx00
1.0
1.1
ELECTRICAL CHARACTERISTICS
Maximum Ratings*
TABLE 1-1
Name VSS SDA SCL VCC
PIN FUNCTION TABLE
Function Ground Serial Data Serial Clock +1.8V to 6.0V (24AA00) +2.5V to 6.0V (24LC00) +4.5V to 5.5V (24C00)
Vcc ...................................................................................7.0V All inputs and outputs w.r.t. Vss................. -0.6V to Vcc +1.0V Storage temperature ..................................... -65C to +150C Ambient temp. with power applied................. -65C to +125C Soldering temperature of leads (10 seconds) ............. +300C ESD protection on all pins................................................4 kV
*Notice: Stresses above those listed under "Maximum ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
NC
No Internal Connection
TABLE 1-2
DC CHARACTERISTICS
Tamb = 0C to +70C, Vcc = 1.8V to 6.0V Tamb = -40C to +85C, Vcc = 1.8V to 6.0V Tamb = -40C to +125C, Vcc = 4.5V to 5.5V Max. Units V .3 VCC .05 VCC -10 -10 -- -- -- -- -- .40 10 10 10 2 1 1 V V V A A pF mA mA A (Note) (Note) (Note) IOL = 3.0 mA, VCC = VccMIN VIN = 0.1V to 5.5V VOUT = 0.1V to 5.5V VCC = 5.0V (Note) Tamb = 25C, f = 1 MHz VCC = 5.5V, SCL = 400 kHz VCC = 5.5V, SCL = 400 kHz VCC = 5.5V, SDA = SCL = VCC Conditions
All Parameters apply across the recom- Commercial (C): mended operating ranges unless other- Industrial (I): wise noted Automotive (E) Parameter SCL and SDA pins: High level input voltage Low level input voltage Hysteresis of Schmitt trigger inputs Low level output voltage Input leakage current Output leakage current Pin capacitance (all inputs/outputs) Operating current Standby current Note: Symbol VIH VIL VHYS VOL ILI ILO CIN, COUT ICC Write ICC Read ICCS
Min. .7 VCC
This parameter is periodically sampled and not 100% tested.
FIGURE 1-1:
BUS TIMING DATA
TF THIGH TR
SCL
TSU:STA TLOW THD:DAT TSU:DAT TSU:STO
SDA IN
THD:STA TSP TAA TBUF
SDA OUT
DS21178A-page 2
Preliminary
(c) 1996 Microchip Technology Inc.
24xx00
TABLE 1-3 AC CHARACTERISTICS
Commercial (C): Industrial (I): Automotive (E): Symbol FCLK Min -- -- -- 4000 4000 600 4700 4700 1300 -- -- -- -- 4000 4000 600 4700 4700 600 0 250 250 100 4000 4000 600 -- -- -- 4700 4700 1300 20+0.1 CB -- -- 1M Tamb = 0C to +70C, Vcc = 1.8V to 6.0V Tamb = -40C to +85C, Vcc = 1.8V to 6.0V Tamb = -40C to +125C, Vcc = 4.5V to 5.5V Max 100 100 400 -- -- -- -- -- -- 1000 1000 300 300 -- -- -- -- -- -- -- -- -- -- -- -- -- 3500 3500 900 -- -- -- 250 50 4 -- Units kHz Conditions 4.5V Vcc 5.5V (E Temp range) 1.8V Vcc 4.5V 4.5V Vcc 6.0V 4.5V Vcc 5.5V (E Temp range) 1.8V Vcc 4.5V 4.5V Vcc 6.0V 4.5V Vcc 5.5V (E Temp range) 1.8V Vcc 4.5V 4.5V Vcc 6.0V 4.5V Vcc 5.5V (E Temp range) 1.8V Vcc 4.5V 4.5V Vcc 6.0V (Note 1) 4.5V Vcc 5.5V (E Temp range) 1.8V Vcc 4.5V 4.5V Vcc 6.0V 4.5V Vcc 5.5V (E Temp range) 1.8V Vcc 4.5V 4.5V Vcc 6.0V (Note 2) 4.5V Vcc 5.5V (E Temp range) 1.8V Vcc 4.5V 4.5V Vcc 6.0V 4.5V Vcc 5.5V (E Temp range) 1.8V Vcc 4.5V 4.5V Vcc 6.0V 4.5V Vcc 5.5V (E Temp range) 1.8V Vcc 4.5V 4.5V Vcc 6.0V 4.5V Vcc 5.5V (E Temp range) 1.8V Vcc 4.5V 4.5V Vcc 6.0V (Note 1), CB 100 pF (Notes 1, 3) All Parameters apply across all recommended operating ranges unless otherwise noted Parameter Clock frequency
Clock high time
THIGH
ns
Clock low time
TLOW
ns
SDA and SCL rise time (Note 1) SDA and SCL fall time START condition hold time
TR
ns
TF THD:STA
ns ns
START condition setup time
TSU:STA
ns
Data input hold time Data input setup time
THD:DAT TSU:DAT
ns ns
STOP condition setup time
TSU:STO
ns
Output valid from clock (Note 2) Bus free time: Time the bus must be free before a new transmission can start Output fall time from VIH minimum to VIL maximum Input filter spike suppression (SDA and SCL pins) Write cycle time Endurance
TAA
ns
TBUF
ns
TOF TSP TWC
ns ns ms cycles
25C, VCC = 5.0V, Block Mode (Note 4)
Note 1: Not 100% tested. CB = total capacitance of one bus line in pF. 2: As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region (minimum 300 ns) of the falling edge of SCL to avoid unintended generation of START or STOP conditions. 3: The combined TSP and VHYS specifications are due to new Schmitt trigger inputs which provide improved noise spike suppression. This eliminates the need for a TI specification for standard operation. 4: This parameter is not tested but guaranteed by characterization. For endurance estimates in a specific application, please consult the Total Endurance Model which can be obtained on Microchip's BBS or website.
(c) 1996 Microchip Technology Inc.
Preliminary
DS21178A-page 3
24xx00
2.0
2.1
PIN DESCRIPTIONS
SDA Serial Data
0.1
Stop Data Transfer (C)
This is a bi-directional pin used to transfer addresses and data into and data out of the device. It is an open drain terminal, therefore the SDA bus requires a pull-up resistor to VCC (typical 10k for 100 kHz, 1k for 400 kHz). For normal data transfer SDA is allowed to change only during SCL low. Changes during SCL high are reserved for indicating the START and STOP conditions.
A LOW to HIGH transition of the SDA line while the clock (SCL) is HIGH determines a STOP condition. All operations must be ended with a STOP condition.
4.3
Data Valid (D)
The state of the data line represents valid data when, after a START condition, the data line is stable for the duration of the HIGH period of the clock signal. The data on the line must be changed during the LOW period of the clock signal. There is one bit of data per clock pulse. Each data transfer is initiated with a START condition and terminated with a STOP condition. The number of the data bytes transferred between the START and STOP conditions is determined by the master device and is theoretically unlimited.
2.2
SCL Serial Clock
This input is used to synchronize the data transfer from and to the device.
2.3
Noise Protection
The SCL and SDA inputs have Schmitt trigger and filter circuits which suppress noise spikes to assure proper device operation even on a noisy bus.
4.4
Acknowledge
3.0
FUNCTIONAL DESCRIPTION
The 24xx00 supports a bi-directional 2-wire bus and data transmission protocol. A device that sends data onto the bus is defined as a transmitter, and a device receiving data as a receiver. The bus has to be controlled by a master device which generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions, while the 24xx00 works as slave. Both master and slave can operate as transmitter or receiver, but the master device determines which mode is activated.
Each receiving device, when addressed, is obliged to generate an acknowledge after the reception of each byte. The master device must generate an extra clock pulse which is associated with this acknowledge bit. Note: The 24xx00 does not generate any acknowledge bits if an internal programming cycle is in progress.
4.0
BUS CHARACTERISTICS
The following bus protocol has been defined: * Data transfer may be initiated only when the bus is not busy. * During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in the data line while the clock line is HIGH will be interpreted as a START or STOP condition. Accordingly, the following bus conditions have been defined (Figure 4-1).
The device that acknowledges has to pull down the SDA line during the acknowledge clock pulse in such a way that the SDA line is stable LOW during the HIGH period of the acknowledge related clock pulse. Of course, setup and hold times must be taken into account. A master must signal an end of data to the slave by not generating an acknowledge bit on the last byte that has been clocked out of the slave. In this case, the slave must leave the data line HIGH to enable the master to generate the STOP condition (Figure 4-2).
4.1
Bus not Busy (A)
Both data and clock lines remain HIGH.
4.2
Start Data Transfer (B)
A HIGH to LOW transition of the SDA line while the clock (SCL) is HIGH determines a START condition. All commands must be preceded by a START condition.
DS21178A-page 4
Preliminary
(c) 1996 Microchip Technology Inc.
24xx00
FIGURE 4-1:
SCL (A) (B)
DATA TRANSFER SEQUENCE ON THE SERIAL BUS
(C) (D) (C) (A)
SDA
START CONDITION
ADDRESS OR ACKNOWLEDGE VALID
DATA ALLOWED TO CHANGE
STOP CONDITION
FIGURE 4-2:
ACKNOWLEDGE TIMING
Acknowledge Bit
SCL SDA
1
2
3
4
5
6
7
8
9
1
2
3
Data from transmitter Transmitter must release the SDA line at this point allowing the Receiver to pull the SDA line low to acknowledge the previous eight bits of data.
Data from transmitter Receiver must release the SDA line at this point so the Transmitter can continue sending data.
5.0
DEVICE ADDRESSING
FIGURE 5-1:
CONTROL BYTE FORMAT
Read/Write Bit
After generating a START condition, the bus master transmits a control byte consisting of a slave address and a Read/Write bit that indicates what type of operation is to be performed. The slave address for the 24xx00 consists of a 4-bit device code (1010) followed by three don't care bits. The last bit of the control byte determines the operation to be performed. When set to a one a read operation is selected, and when set to a zero a write operation is selected. (Figure 5-1). The 24xx00 monitors the bus for its corresponding slave address all the time. It generates an acknowledge bit if the slave address was true and it is not in a programming mode.
Device Select Bits
Don't Care Bits 0 X X X R/W ACK
S
1
0
1
Slave Address Start Bit Acknowledge Bit
(c) 1996 Microchip Technology Inc.
Preliminary
DS21178A-page 5
24xx00
6.0
6.1
WRITE OPERATIONS
Byte Write
7.0
ACKNOWLEDGE POLLING
Following the start signal from the master, the device code (4 bits), the don't care bits (3 bits), and the R/W bit (which is a logic low) are placed onto the bus by the master transmitter. This indicates to the addressed slave receiver that a byte with a word address will follow after it has generated an acknowledge bit during the ninth clock cycle. Therefore, the next byte transmitted by the master is the word address and will be written into the address pointer of the 24xx00. Only the lower four address bits are used by the device, and the upper four bits are don't cares. The 24xx00 will acknowledge the address byte and the master device will then transmit the data word to be written into the addressed memory location. The 24xx00 acknowledges again and the master generates a stop condition. This initiates the internal write cycle, and during this time the 24xx00 will not generate acknowledge signals (Figure 7-2). After a byte write command, the internal address counter will not be incremented and will point to the same address location that was just written. If a stop bit is transmitted to the device at any point in the write command sequence before the entire sequence is complete, then the command will abort and no data will be written. If more than 8 data bits are transmitted before the stop bit is sent, then the device will clear the previously loaded byte and begin loading the data buffer again. If more than one data byte is transmitted to the device and a stop bit is sent before a full eight data bits have been transmitted, then the write command will abort and no data will be written. The 24xx00 employs a VCC threshold detector circuit which disables the internal erase/ write logic if the VCC is below 1.5V (24AA00 and 24LC00) or 3.8V (24C00) at nominal conditions.
Since the device will not acknowledge during a write cycle, this can be used to determine when the cycle is complete (this feature can be used to maximize bus throughput). Once the stop condition for a write command has been issued from the master, the device initiates the internally timed write cycle. ACK polling can be initiated immediately. This involves the master sending a start condition followed by the control byte for a write command (R/W = 0). If the device is still busy with the write cycle, then no ACK will be returned. If no ACK is returned, then the start bit and control byte must be re-sent. If the cycle is complete, then the device will return the ACK and the master can then proceed with the next read or write command. See Figure 7-1 for flow diagram.
FIGURE 7-1:
ACKNOWLEDGE POLLING FLOW
Send Write Command
Send Stop Condition to Initiate Write Cycle
Send Start
Send Control Byte with R/W = 0
Did Device Acknowledge (ACK = 0)? YES Next Operation
NO
FIGURE 7-2:
BUS ACTIVITY MASTER SDA LINE
BYTE WRITE
S T A R T S 1 0 1 CONTROL BYTE WORD ADDRESS DATA S T O P P A C K A C K
0
X
X
X
0 A C K
X
X
X
X
BUS ACTIVITY X = Don't Care Bit
DS21178A-page 6
Preliminary
(c) 1996 Microchip Technology Inc.
24xx00
8.0 READ OPERATIONS
Read operations are initiated in the same way as write operations with the exception that the R/W bit of the slave address is set to one. There are three basic types of read operations: current address read, random read, and sequential read. device as part of a write operation. After the word address is sent, the master generates a start condition following the acknowledge. This terminates the write operation, but not before the internal address pointer is set. Then the master issues the control byte again but with the R/W bit set to a one. The 24xx00 will then issue an acknowledge and transmits the eight bit data word. The master will not acknowledge the transfer but does generate a stop condition and the device discontinues transmission (Figure 8-2). After this command, the internal address counter will point to the address location following the one that was just read.
8.1
Current Address Read
The 24xx00 contains an address counter that maintains the address of the last word accessed, internally incremented by one. Therefore, if the previous read access was to address n, the next current address read operation would access data from address n + 1. Upon receipt of the slave address with the R/W bit set to one, the device issues an acknowledge and transmits the eight bit data word. The master will not acknowledge the transfer but does generate a stop condition and the device discontinues transmission (Figure 8-1).
8.3
Sequential Read
8.2
Random Read
Sequential reads are initiated in the same way as a random read except that after the device transmits the first data byte, the master issues an acknowledge as opposed to a stop condition in a random read. This directs the device to transmit the next sequentially addressed 8-bit word (Figure 8-3). To provide sequential reads the 24xx00 contains an internal address pointer which is incremented by one at the completion of each read operation. This address pointer allows the entire memory contents to be serially read during one operation.
Random read operations allow the master to access any memory location in a random manner. To perform this type of read operation, first the word address must be set. This is done by sending the word address to the
FIGURE 8-1:
CURRENT ADDRESS READ
BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY S T A R T CONTROL BYTE S T O P
S 1 0 1 0 XXX 1
P
A C K DATA N O A C K
X = Don't Care Bit
FIGURE 8-2:
RANDOM READ
S T A R T CONTROL BYTE WORD ADDRESS (n)
XXXX
BUS ACTIVITY MASTER
S T A R T
CONTROL BYTE
S T O P
S 10 10XXX0
S 10 10XXX1
P
A C K DATA (n) N O A C K
SDA LINE
BUS ACTIVITY
X = Don't Care Bit
A C K
A C K
FIGURE 8-3:
BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY
SEQUENTIAL READ
CONTROL BYTE DATA n DATA n + 1 DATA n + 2 DATA n + X S T O P
P
A C K A C K A C K A C K N O A C K
(c) 1996 Microchip Technology Inc.
Preliminary
DS21178A-page 7
24xx00
NOTES:
DS21178A-page 8
Preliminary
(c) 1996 Microchip Technology Inc.
24xx00
NOTES:
(c) 1996 Microchip Technology Inc.
Preliminary
DS21178A-page 9
24xx00
NOTES:
DS21178A-page 10
Preliminary
(c) 1996 Microchip Technology Inc.
24xx00
24XX00 PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. 24xx00 -- /P Package: P SN ST OT = = = = Plastic DIP (300 mil Body), 8-lead Plastic SOIC (150 mil Body) TSSOP, 8-lead SOT-23, 5 lead
Temperature Range: Device:
Blank = 0C to +70C I = -40C to +85C E = -40C to +125C 24AA00 24AA00T 24LC00 24LC00T 24C00 24C00T 128 bit 1.8V I2C Serial EEPROM 128 bit 1.8V K I2C Serial EEPROM (Tape and Reel) 128 bit 2.5V I2C Serial EEPROM 128 bit 2.5V K I2C Serial EEPROM (Tape and Reel) 128 bit 5.0V I2C Serial EEPROM 128 bit 5.0V K I2C Serial EEPROM (Tape and Reel)
Sales and Support
Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. Your local Microchip sales office (see last page) 2. The Microchip Corporate Literature Center U.S. FAX: (602) 786-7277 3. The Microchip's Bulletin Board, via your local CompuServe number (CompuServe membership NOT required). Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. Development Tools For the latest version information and upgrade kits for Microchip Development Tools, please call 1-800-755-2345 or 1-602-786-7302. The latest version of Development Tools software can be downloaded from either our Bulletin Board or Worldwide Web Site. (Information on how to connect to our BBS or WWW site can be found in the On-Line Support section of this data sheet.)
(c) 1996 Microchip Technology Inc.
Preliminary
DS21178A-page 11
Worldwide Sales & Service
AMERICAS
Corporate Office
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All rights reserved. (c) 1996, Microchip Technology Incorporated, USA. 12/96 Printed on recycled paper.
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip's products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. All rights reserved. All other trademarks mentioned herein are the property of their respective companies.
DS21178A-page 12
Preliminary
(c) 1996 Microchip Technology Inc.

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