24C01CT-E/ST

24C01C 1K 5.0V I2C™ Serial EEPROM Features: Description: • Single Supply with Operation from 4.5V to 5.5V • Low-Power CMOS Technology: - Read current 1 mA, max. - Standby current 5 A, max. • 2-Wire Serial Interface, I2C™ Compatible • Cascadable up to Eight Devices • Schmitt Trigger Inputs for Noise Suppression • Output Slope Control to Eliminate Ground Bounce • 100 kHz and 400 kHz Clock Compatibility • Page Write Time 1 ms max. • Self-Timed Erase/Write Cycle • 16-Byte Page Write Buffer • ESD Protection >4000V • More than 1 Million Erase/Write Cycles • Data Retention >200 Years • Factory Programming Available • Packages include 8-lead PDIP, SOIC, TSSOP, DFN, TDFN, MSOP and 6-lead SOT-23 • Pb-Free and RoHS Compliant • Temperature Ranges: - Industrial (I): -40C to +85C - Automotive (E): -40C to +125C The Microchip Technology Inc. 24C01C is a 1K bit Serial Electrically Erasable PROM with a voltage range of 4.5V to 5.5V. The device is organized as a single block of 128 x 8-bit memory with a 2-wire serial interface. Low-current design permits operation with max. standby and active currents of only 5 A and 1 mA, respectively. The device has a page write capability for up to 16 bytes of data and has fast write cycle times of only 1 ms for both byte and page writes. Functional address lines allow the connection of up to eight 24C01C devices on the same bus for up to 8K bits of contiguous EEPROM memory. The device is available in the standard 8-pin PDIP, 8-pin SOIC (3.90 mm), 8-pin 2x3 DFN and TDFN, 8-pin MSOP and TSSOP packages. The 24C01C is also available in the 6-lead SOT-23 package. Block Diagram A0 A1 A2 HV Generator I/O Control Logic Memory Control Logic EEPROM XDEC Array SDA SCL VCC YDEC VSS Sense Amp. R/W Control Package Types PDIP, MSOP DFN/TDFN SOIC, TSSOP A0 1 8 VCC A1 2 7 A2 3 VSS 4 A0 1 8 VCC Test A1 2 7 Test 6 SCL A2 3 6 SCL 5 SDA VSS 4 5 SDA  1997-2012 Microchip Technology Inc. A0 1 A1 2 A2 3 VSS 4 8 VCC 7 Test 6 SCL 5 SDA SOT-23 SCL 1 6 VCC VSS 2 5 A0 SDA 3 4 A1 DS21201K-page 1 24C01C 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings(†) VCC .............................................................................................................................................................................7.0V All inputs and outputs w.r.t. VSS ......................................................................................................... -0.6V to VCC +1.0V Storage temperature ...............................................................................................................................-65°C to +150°C Ambient temperature with power applied ................................................................................................-40°C to +125°C ESD protection on all pins  4 kV † NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. TABLE 1-1: DC CHARACTERISTICS DC CHARACTERISTICS Param. No. Sym. Characteristic Electrical Characteristics: Industrial (I): VCC = +4.5V to 5.5V Automotive (E): VCC = +4.5V to 5.5V Min. Max. Units TA = -40°C to +85°C TA = -40°C to +125°C Conditions D1 — A0, A1, A2, SCL, SDA and WP pins: — — — — D2 VIH High-level input voltage 0.7 VCC — V — D3 VIL Low-level input voltage — 0.3 VCC V — D4 VHYS Hysteresis of Schmitt Trigger inputs (SDA, SCL pins) 0.05 VCC — V (Note) D5 VOL Low-level output voltage — 0.40 V IOL = 3.0 mA @ VCC = 4.5V D6 ILI Input leakage current — ±1 A VIN = VSS or VCC, WP = VSS D7 ILO Output leakage current — ±1 A VOUT = VSS or VCC D8 CIN, COUT Pin capacitance (all inputs/outputs) — 10 pF VCC = 5.0V (Note) TA = 25°C, f = 1 MHz D9 ICC Read Operating current — 1 mA VCC = 5.5V, SCL = 400 kHz — 3 mA VCC = 5.5V D10 ICCS — 5 A VCC = 5.5V, SDA = SCL = VCC WP = VSS ICC Write Note: Standby current This parameter is periodically sampled and not 100% tested. DS21201K-page 2  1997-2012 Microchip Technology Inc. 24C01C TABLE 1-2: AC CHARACTERISTICS Electrical Characteristics: Industrial (I): VCC = +4.5V to 5.5V Automotive (E): VCC = +4.5V to 5.5V AC CHARACTERISTICS Param. No. Sym. Characteristic Min. Max. Units Conditions 1 FCLK Clock frequency — — 100 400 kHz — (I-temp) 2 THIGH Clock high time 4000 600 — — ns — (I-temp) 3 TLOW Clock low time 4700 1300 — — ns — (I-temp) 4 TR SDA and SCL rise time (Note 1) — — 1000 300 ns — (I-temp) 5 TF SDA and SCL fall time (Note 1) — 300 ns — 6 THD:STA Start condition hold time 4000 600 — — ns — (I-temp) 7 TSU:STA Start condition setup time 4700 600 — — ns — (I-temp) 8 THD:DAT Data input hold time 0 — ns (Note 2) 9 TSU:DAT Data input setup time 250 100 — — ns — (I-temp) 10 TSU:STO Stop condition setup time 4000 600 — — ns — (I-temp) 11 TAA Output valid from clock (Note 2) — — 3500 900 ns — (I-temp) 12 TBUF Bus free time: Time the bus must be free before a new transmission can start 4700 1300 — — ns — (I-temp) 13 TOF Output fall time from VIH minimum to VIL maximum CB  100 pF 10 + 0.1CB 250 ns (Note 1) 14 TSP Input filter spike suppression (SDA and SCL pins) — 50 ns (Note 3) 15 TWC Write cycle time (byte or page) — 1.5 1 ms — (I-temp) 16 — Endurance 1,000,000 — Note 1: 2: 3: 4: TA = -40°C to +85°C TA = -40°C to +125°C cycles 25°C (Note 4) Not 100% tested. CB = total capacitance of one bus line in pF. 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. 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. This parameter is not tested but ensured by characterization. For endurance estimates in a specific application, please consult the Total Endurance™ Model, which can be obtained from Microchip’s web site at www.microchip.com.  1997-2012 Microchip Technology Inc. DS21201K-page 3 24C01C FIGURE 1-1: BUS TIMING DATA 5 SCL 7 SDA IN D4 2 3 8 9 4 10 6 14 11 12 SDA OUT DS21201K-page 4  1997-2012 Microchip Technology Inc. 24C01C 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE 8-pin PDIP 8-pin SOIC 8-pin TSSOP 8-pin MSOP 8-pin DFN/TDFN SOT-23 A0 1 1 1 1 1 5 Chip Select A1 2 2 2 2 2 4 Chip Select Name Function A2 3 3 3 3 3 — Chip Select VSS 4 4 4 4 4 2 Ground SDA 5 5 5 5 5 3 Serial Data SCL 6 6 6 6 6 1 Serial Clock Test 7 7 7 7 7 — Test VCC 8 8 8 8 8 6 +4.5V to 5.5V Power Supply 2.1 SDA Serial Data This is a bidirectional 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 pullup resistor to VCC (typical 10 k for 100 kHz, 2 k 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. 2.2 2.5 Noise Protection The 24C01C employs a VCC threshold detector circuit which disables the internal erase/write logic if the VCC is below 3.8 volts at nominal conditions. 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. SCL Serial Clock This input is used to synchronize the data transfer from and to the device. 2.3 A0, A1, A2 The levels on these inputs are compared with the corresponding bits in the slave address. The chip is selected if the compare is true. Up to eight 24C01C devices may be connected to the same bus by using different Chip Select bit combinations. These inputs must be connected to either VCC or VSS. For the SOT-23 devices up to four devices may be connected to the same bus using different Chip Select bit combinations. In most applications, the chip address inputs A0, A1 and A2 are hard-wired to logic ‘0’ or logic ‘1’. For applications in which these pins are controlled by a microcontroller or other programmable device, the chip address pins must be driven to logic ‘0’ or logic ‘1’ before normal device operation can proceed. 2.4 Test This pin is utilized for testing purposes only. It may be tied high, tied low or left floating.  1997-2012 Microchip Technology Inc. DS21201K-page 5 24C01C 3.0 FUNCTIONAL DESCRIPTION The 24C01C supports a bidirectional 2-wire bus and data transmission protocol. A device that sends data onto the bus is defined as transmitter, and a device receiving data as receiver. The bus has to be controlled by a master device that generates the Serial Clock (SCL), controls the bus access, and generates the Start and Stop conditions, while the 24C01C works as slave. Both master and slave can operate as transmitter or receiver, but the master device determines which mode is activated. 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). 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. 4.3 Stop Data Transfer (C) 4.4 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, although only the last sixteen will be stored when doing a write operation. When an overwrite does occur it will replace data in a first-in firstout fashion. 4.5 Acknowledge Each receiving device, when addressed, is required 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 24C01C does not generate any Acknowledge bits if an internal programming cycle is in progress. 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) 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. DS21201K-page 6  1997-2012 Microchip Technology Inc. 24C01C FIGURE 4-1: SCL (A) DATA TRANSFER SEQUENCE ON THE SERIAL BUS (B) (C) (D) Start Condition Address or Acknowledge Valid (C) (A) SDA FIGURE 4-2: Stop Condition Data Allowed to Change ACKNOWLEDGE TIMING Acknowledge Bit SCL SDA 1 2 3 4 5 6 7 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.  1997-2012 Microchip Technology Inc. 8 9 1 2 3 Data from transmitter Receiver must release the SDA line at this point so the Transmitter can continue sending data. DS21201K-page 7 24C01C 5.0 DEVICE ADDRESSING A control byte is the first byte received following the Start condition from the master device (Figure 5-1). The control byte consists of a four-bit control code; for the 24C01C this is set as ‘1010’ binary for read and write operations. The next three bits of the control byte are the Chip Select bits (A2, A1, A0). The Chip Select bits allow the use of up to eight 24C01C devices on the same bus and are used to select which device is accessed. The Chip Select bits in the control byte must correspond to the logic levels on the corresponding A2, A1 and A0 pins for the device to respond. These bits are in effect the three Most Significant bits of the word address. For the SOT-23 package, the A2 address pin is not available. During device addressing, the A2 Chip Select bit should be set to ‘0’. The last bit of the control byte defines the operation to be performed. When set to a ‘1’ a read operation is selected, and when set to a ‘0’ a write operation is selected. Following the Start condition, the 24C01C monitors the SDA bus checking the control byte being transmitted. Upon receiving a ‘1010’ code and appropriate Chip Select bits, the slave device outputs an Acknowledge signal on the SDA line. Depending on the state of the R/W bit, the 24C01C will select a read or write operation. DS21201K-page 8 FIGURE 5-1: CONTROL BYTE FORMAT Read/Write Bit Chip Select Bits Control Code S 1 0 1 0 A2 A1 A0 R/W ACK Slave Address Start Bit 5.1 Acknowledge Bit Contiguous Addressing Across Multiple Devices The Chip Select bits A2, A1, A0 can be used to expand the contiguous address space for up to 8K bits by adding up to eight 24C01C devices on the same bus. In this case, software can use A0 of the control byte as address bit A8, A1 as address bit A9, and A2 as address bit A10. It is not possible to sequentially read across device boundaries. For the SOT-23 package, up to four 24C01C devices can be added for up to 4K bits of address space. In this case, software can use A0 of the control byte as address bit A8, and A1 as address bit A9. It is not possible to sequentially read across device boundaries.  1997-2012 Microchip Technology Inc. 24C01C 6.0 WRITE OPERATIONS 6.1 Byte Write After the receipt of each word, the four lower order Address Pointer bits are internally incremented by one. The higher order four bits of the word address remains constant. If the master should transmit more than 16 bytes prior to generating the Stop condition, the address counter will roll over and the previously received data will be overwritten. As with the byte write operation, once the Stop condition is received an internal write cycle will begin (Figure 6-2). Following the Start signal from the master, the device code (4 bits), the Chip Select bits (3 bits), and the R/W bit, which is a logic low, is placed onto the bus by the master transmitter. The device will acknowledge this control byte during the ninth clock pulse. The next byte transmitted by the master is the word address and will be written into the Address Pointer of the 24C01C. After receiving another Acknowledge signal from the 24C01C the master device will transmit the data word to be written into the addressed memory location. The 24C01C acknowledges again and the master generates a Stop condition. This initiates the internal write cycle, and during this time the 24C01C will not generate Acknowledge signals (Figure 6-1). 6.2 Note: Page Write The write control byte, word address and the first data byte are transmitted to the 24C01C in the same way as in a byte write. But instead of generating a Stop condition, the master transmits up to 15 additional data bytes to the 24C01C which are temporarily stored in the on-chip page buffer and will be written into the memory after the master has transmitted a Stop condition. FIGURE 6-1: Page write operations are limited to writing bytes within a single physical page, regardless of the number of bytes actually being written. Physical page boundaries start at addresses that are integer multiples of the page buffer size (or ‘page size’) and end at addresses that are integer multiples of [page size – 1]. If a Page Write command attempts to write across a physical page boundary, the result is that the data wraps around to the beginning of the current page (overwriting data previously stored there), instead of being written to the next page as might be expected. It is therefore necessary for the application software to prevent page write operations that would attempt to cross a page boundary. BYTE WRITE Bus Activity Master S T A R T SDA Line S Control Byte Word Address S T O P Data P A C K Bus Activity FIGURE 6-2: A C K A C K PAGE WRITE Bus Activity Master S T A R T SDA Line S Control Byte Bus Activity  1997-2012 Microchip Technology Inc. Word Address (n) Data n S T O P Data n + 15 Data n +1 P A C K A C K A C K A C K A C K DS21201K-page 9 24C01C 7.0 ACKNOWLEDGE POLLING 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)? NO YES Next Operation DS21201K-page 10  1997-2012 Microchip Technology Inc. 24C01C 8.0 READ OPERATION 8.2 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 24C01C as part of a write operation. 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. 8.1 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 24C01C 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 24C01C 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. Current Address Read The 24C01C 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 24C01C 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 24C01C discontinues transmission (Figure 8-1). FIGURE 8-1: S T A R T SDA Line S Control Byte P Bus Activity FIGURE 8-2: To provide sequential reads the 24C01C contains an internal Address Pointer which is incremented by one at the completion of each operation. This Address Pointer allows the entire memory contents to be serially read during one operation. The internal Address Pointer will automatically roll over from address 7F to address 00. N O A C K RANDOM READ Bus Activity Master S T A R T Control Byte S T A R T Word Address (n) S SDA Line Control Byte S T O P Data (n) P S A C K A C K Bus Activity Bus Activity Master Sequential Read Sequential reads are initiated in the same way as a random read except that after the 24C01C transmits the first data byte, the master issues an acknowledge as opposed to a Stop condition in a random read. This directs the 24C01C to transmit the next sequentially addressed 8-bit word (Figure 8-3). S T O P Data A C K FIGURE 8-3: 8.3 CURRENT ADDRESS READ Bus Activity Master Random Read A C K N O A C K SEQUENTIAL READ Control Byte Data n Data n + 1 Data n + 2 S T O P Data n + X P SDA Line Bus Activity A C K  1997-2012 Microchip Technology Inc. A C K A C K A C K N O A C K DS21201K-page 11 24C01C 9.0 PACKAGING INFORMATION 9.1 Package Marking Information 8-Lead PDIP (300 mil) XXXXXXXX T/XXXNNN YYWW 8-Lead SOIC (3.90 mm) XXXXXXXT XXXXYYWW NNN 8-Lead TSSOP Example: 24C01CI SN e3 0527 13F Example: 4C1C TYWW I527 NNN 13F XXXXT YWWNNN 8-Lead 2x3 DFN XXX YWW NN 8-Lead 2x3 TDFN DS21201K-page 12 24C01C I/P e3 13F 0527 XXXX 8-Lead MSOP XXX YWW NN Example: Example: 4C1CI 52713F Example: 2N7 527 13 Example: AN7 527 13  1997-2012 Microchip Technology Inc. 24C01C 1st Line Marking Codes Part Number 24C01C Note: TSSOP MSOP 4C1C 4C1CT DFN TDFN SOT-23 I Temp. E Temp. I Temp. E Temp. I Temp. E Temp. 2N7 2N8 AN7 AN8 HANN HBNN T = Temperature grade (I, E) 6-Lead SOT-23 HAEC XXNN Legend: XX...X T Y YY WW NNN e3 Note: Example: Part number or part number code Temperature (I, E) Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code (2 characters for small packages) Pb-free JEDEC designator for Matte Tin (Sn) Note: For very small packages with no room for the Pb-free JEDEC designator e3 , the marking will only appear on the outer carton or reel label. Note: In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. Please visit www.microchip.com/Pbfree for the latest information on Pb-free conversion. *Standard OTP marking consists of Microchip part number, year code, week code, and traceability code.  1997-2012 Microchip Technology Inc. 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