24C128 ETC1 | Alldatasheet

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CMOS I²C 2-WIRE BUS 128K/256K ELECTRICALLY ERASABLE PROGRAMMABLE ROM 16K/32K X 8 BIT EEPROM Turbo IC, Inc. 24C128/24C256 SERIAL DATA (SDA) SDA is a bidirectional pin used to transfer data in and out of the Turbo IC 24C128/24C256. The pin is an open-drain output. A pull-up resistor WRITE PROTECT (WP) When the write protect input is connected to Vcc, the entire memory is protected against write op- erations. For normal write operation, the write protect pin should be grounded. When this pin is left unconnected, WP is interpreted as zero. PIN DESCRIPTION DEVICE ADDRESSES (A2-A0) The address inputs are used to define the 3 least significant bits of the 7-bit device address code - 1010 (A2) (A1) (A0). These pins can be con- nected either high or low. A maximum of eight Turbo IC 24C128/24C256 can be connected in parallel, each with a unique device address. When these pins are left unconnected, the device ad- dresses are interpreted as zero. must be connected from SDA to Vcc. SERIAL CLOCK (SCL) The SCL input synchronizes the data on the SDA bus. It is used in conjunction with SDA to define the start and stop conditions. It is also used in conjunction with SDA to transfer data to and from the Turbo IC 24C128/24C256. GND VCC WP SCL SDA 8 pin PDIP GND VCC WP SCL SDA 8 pin SOIC PIN DESCRIPTION DESCRIPTION: The Turbo IC 24C128/24C256 is a serial 128K/256K EEPROM fabricated with Turbo’s proprietary, high reliabil- ity, high performance CMOS technology. It’s 128K/256K of memory is organized as 16384/32768 x 8 bits. The memory is configured as 256/512 pages with each page containing 64 bytes. This device offers significant advantages in low power and low voltage applications. The Turbo IC 24C128/24C256 uses the extended I²C ad- dressing protocol and 2-wire serial interface which includes a bidirectional serial data bus synchronized by a clock. It offers a flexible byte write and a faster 64-byte page write. The entire memory can be protected by the write protect pin. The Turbo IC 24C128/24C256 is assembled in either a 8- pin PDIP or 8-pin SOIC package. Pin #1 (A0), #2 (A1), and #3 (A2) are device address input pins which are hardwired by the user. Pin #4 is the ground (Vss). Pin #5 is the serial data (SDA) pin used for bidirectional transfer of data. Pin #6 is the serial clock (SCL) input pin. Pin #7 is the write protect (WP) input pin, and Pin #8 is the power supply (Vcc) pin. All data is serially transmitted in bytes (8 bits) on the SDA bus. To access the Turbo IC 24C128/24C256 (slave) for a read or write operation, the controller (master) issues a start condition by pulling SDA from high to low while SCL is high. The master then issues the device address byte which con- sists of 1010 (A2) (A1) (A0) (R/W). The 4 most significant bits (1010) are a device type code signifying an EEPROM device. The A[2:0] bits represent the input levels on the 3 device address input pins. The read/write bit determines whether to do a read or write operation. After each byte is transmitted, the receiver has to provide an acknowledge by pulling the SDA bus low on the ninth clock cycle. The ac- knowledge is a handshake signal to the transmitter indicat- ing a successful data transmission. FEATURES :

  • Extended Power Supply Voltage Single Vcc for Read and Programming (Vcc = 2.7 V to 5.5 V)(Vcc = 4.5V to 5.5V)
  • Low Power (Isb = 2µa @ 5.5 V)
  • Extended I²C Bus, 2-Wire Serial Interface
  • Support Byte Write and Page Write (64 Bytes)
  • Automatic Page write Operation (maximum 10 ms) Internal Control Timer Internal Data Latches for 64 Bytes
  • Hardware Data Protection by Write Protect Pin
  • High Reliability CMOS Technology EEPROM Cell Endurance : 100,000 Cycles Data Retention : 100 Years
  • 8 pin JDEC 300 mil wide PDIP AND 8 pin 150 mil wide SOIC packages PRODUCT PRELIMINARY

DESCRIPTION (Continued) For a write operation, the master issues a start condition, device address byte, 2 memory address bytes, and then up to 64 data bytes. The Turbo IC 24C128/24C256 acknowledges after each byte transmission. To terminate the transmission, the master issues a stop condition by pulling SDA from low to high while SCL is high. For a read operation, the master issues a start condition and a device address byte. The Turbo IC 24C128/24C256 ac- knowledges, and then transmits a data byte, which is ac- cessed from the EEPROM memory. The master acknowl- edges, indicating that it requires more data bytes. The Turbo IC 24C128/24C256 transmits more data bytes, with the memory address counter automatically incrementing for each data byte, until the master does not acknowledge, indicating that it is terminating the transmission. The master then is- sues a stop condition. DEVICE OPERATION: BIDIRECTIONAL BUS PROTOCOL: The Turbo IC 24C128/24C256 follows the extended I²C bus protocol. The protocol defines any device that sends data onto the SDA bus as a transmitter, and the receiving device as a receiver. The device controlling the transfer is the mas- ter and the device being controlled is the slave. The master always initiates the data transfers, and provides the clock for both transmit and receive operations. The Turbo IC 24C128/ 24C256 acts as a slave device in all applications. Either the master or the slave can take control of the SDA bus, de- pending on the requirement of the protocol. START/STOP CONDITION AND DATA TRANSITIONS: While SCL clock is high, a high to low transition on the SDA bus is recognized as a START condition which precedes any read or write operation. While SCL clock is high, a low to high transition on the SDA bus is recognized as a STOP con- dition which terminates the communication and places the Turbo IC 24C128/24C256 into standby mode. All other data transitions on the SDA bus must occur while SCL clock is low to ensure proper operation. ACKNOWLEDGE: All data is serially transmitted in bytes (8 bits) on the SDA bus. The acknowledge protocol is used as a handshake sig- nal to indicate successful transmission of a byte of data. The bus transmitter, either the master or the slave (Turbo IC 24C128/24C256), releases the bus after sending a byte of data on the SDA bus. The receiver pulls the SDA bus low during the ninth clock cycle to acknowledge the successful transmission of a byte of data. If the SDA is not pulled low during the ninth clock cycle, the Turbo IC 24C128/24C256 terminates the data transmission and goes into standby mode. For the write operation, the Turbo IC 24C128/24C256 ac- knowledges after the device address byte, acknowledges after each memory address byte, and acknowledges after each subsequent data byte. For the read operation, the Turbo IC 24C128/24C256 ac- knowledges after the device address byte. Then the Turbo IC 24C128/24C256 transmits each subsequent data byte, and the master acknowledges after each data byte transfer, indi- cating that it requires more data bytes. The Turbo IC 24C128/ 24C256 monitors the SDA bus for the acknowledge. To ter- minate the transmission, the master does not acknowledge, and then sends a stop condition. Write Cycle Timing Note: The write cycle time tWC is the time from a valid stop condition of a write sequence to the end of the internal clear / write cycle. SCL SDA WORD n 8th BIT ACK STOP CONDITION START CONDITION tWC Turbo IC, Inc. 24C128/24C256 PRODUCT PRELIMINARY

Turbo IC, Inc. Output Acknowledge Start and Stop Definition SDA SCL DATA STABLE DATA STABLE DATA CHANGE SDA SCL START STOP SCL DATA IN DATA OUT ACKNOWLEDGE START 24C128/24C256 PRODUCT PRELIMINARY

DEVICE ADDRESSING: Following the start condition, the master will issue a device address byte consisting of 1010 (A2) (A1) (A0) (R/W) to ac- cess the selected Turbo IC 24C128/24C256 for a read or write operation. The A[2:0] bits must match with the address input pins of the selected Turbo IC 24C128/24C256. If there is a match, the selected Turbo IC 24C128/24C256 acknowl- edges during the ninth clock cycle by pulling the SDA bus low. If there is no match, the Turbo IC 24C128/24C256 does not acknowledge during the ninth clock cycle and goes into standby mode. The (R/W) bit is a high (1) for read and low (0) for write. DATA INPUT DURING WRITE OPERATION: During the write operation, the Turbo IC 24C128/24C256 latches the SDA bus signal on the rising edge of the SCL clock. DATA OUTPUT DURING READ OPERATION: During the read operation, the Turbo IC 24C128/24C256 se- rially shifts the data onto the SDA bus on the falling edge of the SCL clock. MEMORY ADDRESSING: The memory address is sent by the master in the form of 2 memory address bytes. The memory address bytes can only be sent as part of a write operation. The most significant address byte B(14) B(13) (B12) (B11) (B10) (B9) (B8) is sent first, where B(14) is a “don’t care” bit in the 24C128. Then the least significant address byte (B7) (B6) (B5) (B4) (B3) (B2) (B1) (B0) is sent last. BYTE WRITE OPERATION: The master initiates the byte write operation by issuing a start condition, followed by the device address byte 1010 (A2) (A1) (A0) 0, followed by 2 memory address bytes, fol- lowed by one data byte, then a stop condition. After each byte transfer, the Turbo IC 24C128/24C256 acknowledges the successful data transmission by pulling the SDA bus low. The stop condition starts the internal EEPROM write cycle, and all inputs are disabled until the completion of the write cycle. If the WP pin is high, then the stop condition does not start the internal write cycle and the Turbo IC 24C128/24C256 is immediately ready for the next command. PAGE WRITE OPERATION: The master initiates the page write operation by issuing a start condition, followed by the device address byte 1010 (A2) (A1) (A0) 0, followed by 2 memory address bytes, fol- lowed by up to 64 data bytes, then a stop condition. After each byte transfer, the Turbo IC 24C128/24C256 acknowl- edges the successful data transmission by pulling SDA low. After each data byte transfer, the memory address counter is automatically incremented by one. The stop condition starts the internal EEPROM write cycle only if the stop condition occurs in the clock cycle im- mediately following the acknowledge (10th clock cycle). All inputs are disabled until the completion of the write cycle. If the WP pin is high (1), then the stop condition does not start the internal write cycle, and the Turbo IC 24C128/24C256 is immediately ready for the next command. POLLING ACKNOWLEDGE: During the internal write cycle of a write operation in the Turbo IC 24C128/24C256, the completion of the write cycle can be detected by polling acknowledge. The master starts acknowl- edge polling by issuing a start condition, then followed by the device address byte 1010 (A2) (A1) (A0) 0. If the internal write cycle is finished, the Turbo IC 24C128/24C256 acknowl- edges by pulling the SDA bus low. If the internal write cycle is still ongoing, the Turbo IC 24C128/24C256 does not acknowl- edge because it’s inputs are disabled. Therefore, the device will not respond to any command. By using polling acknowl- edge, the system delay for write operations can be reduced. Otherwise, the system needs to wait for the maximum inter- nal write cycle time, tWC, given in the spec. POWER ON RESET: The Turbo IC 24C128/24C256 has a Power On Reset circuit (POR) to prevent data corruption and accidental write op- erations during power up. On power up, the internal reset signal is on and the Turbo IC 24C128/24C256 will not re- spond to any command until the VCC voltage has reached the POR threshold value. Turbo IC, Inc. 24C128/24C256 PRODUCT PRELIMINARY

Turbo IC, Inc. Device Address R/W MSB LSB * = Don't care bits ! = Don't care bit for 24C128 Page Write Byte Write 24C128/24C256 PRODUCT PRELIMINARY SDA LINE DEVICE ADDRESS FIRST WORD ADDRESS SECOND WORD ADDRESS DATA S T O P A C K A C K L S B A C K M S B L S B R W A C K S T A R T W R I T E M S B 128K * ! M S B 256K SDA LINE DEVICE ADDRESS FIRST WORD ADDRESS (n) SECOND WORD ADDRESS (n) DATA (n) S T O P A C K A C K L S B A C K M S B L S B R W A C K S T A R T W R I T E * ! M S B 256K A C K DATA (n + x) M S B 128K

Turbo IC, Inc. Random Read Current Address Read CURRENT ADDRESS READ: The internal memory address counter of the Turbo IC 24C128/ 24C256 contains the last memory address accessed during the previous read or write operation, incremented by one. To start the current address read operation, the master issues a start condition, followed by the device address byte 1010 (A2) (A1) (A0) 1. The Turbo IC 24C128/24C256 responds with an acknowledge by pulling the SDA bus low, and then serially shifts out the data byte accessed from memory at the location corresponding to the memory address counter. The master does not acknowledge, then sends a stop condi- tion to terminate the read operation. It is noted that the memory address counter is incremented by one after the data byte is shifted out. RANDOM ADDRESS READ: The master starts with a dummy write operation (one with no data bytes) to load the internal memory address counter by first issuing a start condition, followed by the device address byte 1010 (A2) (A1) (A0) 0, followed by the 2 memory ad- dress bytes. Following the acknowledge from the Turbo IC 24C128/24C256, the master starts the current read opera- tion by issuing a start condition, followed by the device ad- dress byte 1010 (A2) (A1) (A0) 1. The Turbo IC 24C128/ 24C256 responds with an acknowledge by pulling the SDA bus low, and then seri- ally shifts out the data byte accessed from memory at the location corresponding to the memory address counter. The master does not acknowledge, then sends a stop condition to terminate the read operation. It is noted that the memory address counter is incremented by one after the data byte is shifted out. SEQUENTIAL READ: The sequential read is initiated by either a current address read or random address read. After the Turbo IC 24C128/ 24C256 serially shifts out the first data byte, the master ac- knowledges by pulling the SDA bus low, indicating that it re- quires additional data bytes. After the data byte is shifted out, the Turbo IC 24C128/24C256 increments the memory address counter by one. Then the Turbo IC 24C128/24C256 shifts out the next data byte. The sequential reads continues for as long as the master keeps acknowledging. When the memory address counter is at the last memory location, the counter will ‘roll-over’ when incremented by one to the first location in memory (address zero). The master terminates the sequential read operation by not acknowledging, then sends a stop condition. SDA LINE DEVICE ADDRESS S T O P N O A C K M S B L S B R W A C K S T A R T R E A D M S B DATA 24C128/24C256 PRODUCT PRELIMINARY SDA LINE DEVICE ADDRESS DATA n S T O P N O A C K A C K A C K M S B L S B R W A C K S T A R T W R I T E R E A D DEVICE ADDRESS WORD ADDRESS N DUMMY WRITE * ! S T A R T

Turbo IC, Inc. D.C. CHARACTERISTICS Symbol Parameter Condition Min Max Units Icc1 Active Vcc Current READ at 100 KHZ 0.4 1.0 MA Icc2 Active Vcc Current WRITE at 100 KHZ 2.0 3.0 MA Isb1 Standby Current Vcc = 2.7 v 0.5 uA Vcc = 5.5 v 2.0 uA Isb2 Standby Current Vcc = 4.5 v 20.0 uA Vcc = 5.5 v 35.0 uA Ili Input Leakage Current Vin=Vcc Max uA Ilo Output Leakage Current uA Vil Input Low Voltage -1.0 V Vih Input High Voltage Vcc+0.5 V Vol2 Output Low Vcc=3.0v Iol=2.1 mA 0.4 V Vol1 Output Low Vcc=2.7v Iol=-0.15 mA 0.25 V Sequential Read SDA LINE DEVICE ADDRESS DATA n DATA n +1 DATA n + 2 S T O P A C K A C K A C K M S B L S B R W A C K S T A R T R E A D N O A C K DATA n + 3 * “Absolute Maximum Ratings” may cause permanent damage to the de- vice. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sec- tion of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ABSOLUTE MAXIMUM RATINGS TEMPERATURE Storage: -65° C to 150° C Under Bias: -55° C to 125° C ALL INPUT OR OUTPUT VOLTAGES with respect to Vss +6 V to -0.3 V RECOMMENDED OPERATING CONDITIONS Temperature Range: Commercial: 0° C to 70° C Industrial: -40° C to 85° C Vcc Supply Voltage: 2.7 to 5.5 Volts 4.5 to 5.5 Volts Endurance: 100,000 Cycles/Byte (Typical) Data Retention:

100 Years

Turbo IC, Inc. 2365 Paragon Drive, Suite I, San Jose, CA 95131 Phone: 408-392-0208 Fax: 408-392-0207 See us at www.turbo-ic.com TURBO IC PRODUCTS AND DOCUMENTS All documents are subject to change without notice. Please contact Turbo IC for the latest revision of documents. Turbo IC does not assume any responsibility for any damage to the user that may result from accidents or operation under abnormal conditions. Turbo IC does not assume any responsibility for the use of any circuitry other than what embodied in a Turbo IC product. No other circuits, patents, licenses are implied. Turbo IC products are not authorized for use in life support systems or other critical systems where component failure may endanger life. System designers should design with error detection and correction, redundancy and backup features. Turbo IC, Inc. tSU.STA tHD.STA tF tLOW tHIGH tLOW tHD.DAT tSU.DAT tR tSU.STO tBUF tDH tAA SCL SDA IN SDA OUT Bus Timing Part Numbers & Order Information TU24C128/256PC-2.7 Operating Voltage blank 4.5 to 5.5 V -2.7 2.7 to 5.5 V Temperature C -Commercial I -Industrial Package P -PDIP S -SOIC 16/32K X 8 Serial EEPROM A.C. CHARACTERISTICS Symbol Parameter 2.7 volt 5.5 volt Units Min Max Min Max SCL SCL Clock Frequency 400 1000 kHZ tLOW Clock Low Period 1.2 0.6 us tHIGH Clock High Period 0.6 0.4 us tAA SCL Low to SDA Data Out 0.9 0.55 us tBUF Bus Free to New Start (1) 1.2 0.5 us tHD.STA Start Hold Time 0.6 0.25 us tSU.STA Start Setup Time 0.6 0.25 us tHD.DAT Data-in Hold Time us tSU.DAT Data-in Set-up Time 100 100 ns tR SCL and SDA Rise Time (1) 0.3 0.3 us tF SCL and SDA Fall Time (1) 300 100 ns tSU.STO Stop Setup Time 0.6 0.25 us tDH Data-out Hold Time ns tWC Write Cycle Time ms Note: 1 This parameter is characterized and not 100% tested. 24C128/24C256 PRODUCT PRELIMINARY