ISSI (R) IS24C01B IS24C02B 1K-bit/2K-bit 2-WIRE SERIAL CMOS EEPROM ADVANCED INFORMATION NOVEMBER 2004 FEATURES DESCRIPTION * Two-Wire Serial Interface, I2CTM compatible -Bi-directional data transfer protocol * 400 KHz (2.5V) and 1 MHz (5.0V) compatibility * Low Power CMOS Technology -Standby Current less than 6 A (5.0V) -Read Current less than 2 mA (5.0V) -Write Current less than 3 mA (5.0V) * Wide Voltage Operation -Vcc = 1.8V to 5.5V for -2 version -Vcc = 2.5V to 5.5V for -3 version * Hardware Data Protection -Write Protect Pin * Sequential Read Feature * Filtered Inputs for Noise Suppression * Self time write cycle with auto clear 5 ms @ 2.5V * Organization: -IS24C01B 128x8 (128 bytes) -IS24C02B 256x8 (256 bytes) * 8 Byte Page Write Buffer * High Reliability -Endurance: 1,000,000 Cycles -Data Retention: 100 Years * Industrial and Automotive temperature ranges * 8-pin PDIP, 8-pin SOIC, and 8-pin TSSOP packages * Lead-free available The IS24C01B and IS24C02B are electrically erasable PROM devices that use the standard 2wire interface for communications. The IS24C01B and IS24C02B contain a memory array of 1K-bits (128 x 8) and 2K-bits (256 x 8), respectively. Each device is organized into 8 byte pages for page write mode. This EEPROM is offered in wide operating voltages of 1.8V to 5.5V and 2.5V to 5.5V to be compatible with most application voltages. ISSI designed this device family to be a practical, lowpower 2-wire EEPROM solution. The devices are available in 8-pin PDIP, 8-pin SOIC, and 8-pin TSSOP packages. The IS24C01B/02B maintains compatibility with the popular 2-wire bus protocol, so it is easy to use in applications implementing this bus type. The simple bus consists of the Serial Clock wire (SCL) and the Serial Data wire (SDA). Using the bus, a Master device such as a microcontroller is usually connected to one or more Slave devices such as this device. The bit stream over the SDA line includes a series of bytes, which identifies a particular Slave device, an instruction, an address within that Slave device, and a series of data, if appropriate. The IS24C01B/02B has a Write Protect pin (WP) to allow blocking of any write instruction transmitted over the bus. Copyright (c) 2004 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 1 IS24C01B ISSI IS24C02B (R) FUNCTIONAL BLOCK DIAGRAM HIGH VOLTAGE GENERATOR, TIMING & CONTROL 8 SDA 5 SCL 6 WP 7 CONTROL LOGIC SLAVE ADDRESS REGISTER & COMPARATOR A0 1 A1 2 A2 3 GND 4 X DECODER Vcc EEPROM ARRAY WORD ADDRESS COUNTER ACK Y DECODER Clock DI/O nMOS > DATA REGISTER PIN CONFIGURATION 8-Pin DIP, SOIC, TSSOP PIN DESCRIPTIONS Address Inputs SDA Serial Address/Data I/O SCL Serial Clock Input A0 1 8 VCC A1 2 7 WP WP Write Protect Input A2 3 6 SCL Vcc Power Supply GND 4 5 SDA GND Ground SCL This input clock pin is used to synchronize the data transfer to and from the device. SDA The SDA is a Bi-directional pin used to transfer addresses and data into and out of the device. The SDA pin is an open drain output and can be wire-Or'ed with other open drain or open collector outputs. The SDA bus requires a pullup resistor to Vcc. 2 A0-A2 A0, A1, A2 The A0, A1 and A2 are the device address inputs. The IS24C01B/02B uses the A0, A1, and A2 for hardware addressing and a total of 8 devices may be used on a single bus system. When the A0, A1, or A2 inputs are left floating, the input internally defaults to zero. WP WP is the Write Protect pin. If the WP pin is tied to VCC on the EEPROM, the entire array becomes Write Protected (Read only). When WP is tied to GND or left floating normal read/ write operations are allowed to the device. Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 IS24C01B ISSI IS24C02B (R) DEVICE OPERATION Stop Condition IS24C01B/02B features serial communication and supports a bi-directional 2-wire bus transmission protocol called I2CTM. The Stop condition is defined as a Low to High transition of SDA when SCL is High. All operations must end with a Stop condition. 2-WIRE BUS The two-wire bus is defined as a Serial Data line (SDA), and a Serial Clock line (SCL). The protocol defines any device that sends data onto the SDA bus as a transmitter, and the receiving devices as receivers. The bus is controlled by Master device that generates the SCL, controls the bus access, and generates the Stop and Start conditions. The IS24C01B/02B is the Slave device on the bus. The Bus Protocol: - Data transfer may be initiated only when the bus is not busy - During a data transfer, the SDA line must remain stable whenever the SCL line is high. Any changes in the SDA line while the SCL line is high will be interpreted as a Start or Stop condition. The state of the SDA line represents valid data after a Start condition. The SDA line must be stable for the duration of the High period of the clock signal. The data on the SDA line may be changed during the Low period of the clock signal. There is one clock pulse per bit of data. Each data transfer is initiated with a Start condition and terminated with a Stop condition. Acknowledge (ACK) After a successful data transfer, each receiving device is required to generate an ACK. The Acknowledging device pulls down the SDA line. Reset The IS24C01B/02B contains a reset function in case the 2-wire bus transmission is accidentally interrupted (eg. a power loss), or needs to be terminated midstream. The reset is caused when the Master device creates a Start condition. To do this, it may be necessary for the Master device to monitor the SDA line while cycling the SCL up to nine times. (For each clock signal transition to High, the Master checks for a High level on SDA.) Standby Mode Power consumption is reduced in standby mode. The IS24C01B/02B will enter standby mode: a) At Power-up, and remain in it until SCL or SDA toggles; b) Following the Stop signal if a no write operation is initiated; or c) Following any internal write operation. Start Condition The Start condition precedes all commands to the device and is defined as a High to Low transition of SDA when SCL is High. The EEPROM monitors the SDA and SCL lines and will not respond until the Start condition is met. Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 3 IS24C01B ISSI IS24C02B DEVICE ADDRESSING WRITE OPERATION The Master begins a transmission by sending a Start condition. The Master then sends the address of the particular Slave devices it is requesting. The Slave device (Fig. 5) address is 8 bits. Byte Write The four most significant bits of the Slave device address are fixed as 1010 for the IS24C01B/02B. The next three bits of the Slave address are specific for each of the EEPROM. The bit values enable access to multiple memory blocks or multiple devices. The IS24C01B/02B uses the three bits A0, A1, and A2 in a comparison with the hard-wired input values on the A0, A1, and A2 pins. Up to eight units may share the 2-wire bus. The last bit of the Slave address specifies whether a Read or Write operation is to be performed. When this bit is set to 1, a Read operation is selected, and when set to 0, a Write operation is selected. After the Master transmits the Start condition and Slave address byte (Fig. 5), the appropriate 2-wire Slave (eg.IS24C02B) will respond with ACK on the SDA line. The Slave will pull down the SDA on the ninth clock cycle, signaling that it received the eight bits of data. The selected EEPROM then prepares for a Read or Write operation by monitoring the bus. (R) In the Byte Write mode, the Master device sends the Start condition and the Slave address information (with the R/W set to Zero) to the Slave device. After the Slave generates an ACK, the Master sends the byte address that is to be written into the address pointer of the IS24C01B/02B. After receiving another ACK from the Slave, the Master device transmits the data byte to be written into the address memory location. The IS24C01B/02B acknowledges once more and the Master generates the Stop condition, at which time the device begins its internal programming cycle. While this internal cycle is in progress, the device will not respond to any request from the Master device. Page Write The IS24C01B/02B is capable of 8-byte Page-Write operation. A Page-Write is initiated in the same manner as a Byte Write, but instead of terminating the internal Write cycle after the first data word is transferred, the Master device can transmit up to 7 more bytes. After the receipt of each data word, the EEPROM responds immediately with an ACK on SDA line, and the three lower order data word address bits are internally incremented by one, while the higher order bits of the data word address remain constant. If a byte address is incremented from the last byte of a page, it returns to the first byte of that page. If the Master device should transmit more than 8 bytes prior to issuing the Stop condition, the address counter will "roll over," and the previously written data will be overwritten. Once all 8 bytes are received and the Stop condition has been sent by the Master, the internal programming cycle begins. At this point, all received data is written to the IS24C01B/02B in a single Write cycle. All inputs are disabled until completion of the internal Write cycle. Acknowledge (ACK) Polling The disabling of the inputs can be used to take advantage of the typical Write cycle time. Once the Stop condition is issued to indicate the end of the host's Write operation, the IS24C01B/02B initiates the internal Write cycle. ACK polling can be initiated immediately. This involves issuing the Start condition followed by the Slave address for a Write operation. If the EEPROM is still busy with the Write operation, no ACK will be returned. If the IS24C01B/02B has completed the Write operation, an ACK will be returned and the host can then proceed with the next Read or Write operation. 4 Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 IS24C01B ISSI IS24C02B (R) READ OPERATION Random Address Read Read operations are initiated in the same manner as Write operations, except that the (R/W) bit of the Slave address is set to "1". There are three Read operation options: current address read, random address read and sequential read. Selective Read operations allow the Master device to select at random any memory location for a Read operation. The Master device first performs a 'dummy' Write operation by sending the Start condition, Slave address and byte address of the location it wishes to read. After the IS24C01B/02B acknowledges the byte address, the Master device resends the Start condition and the Slave address, this time with the R/W bit set to one. The EEPROM then responds with its ACK and sends the data requested. The Master device does not send an ACK but will generate a Stop condition. (Refer to Figure 9. Random Address Read Diagram.) Current Address Read The IS24C01B/02B contains an internal address counter which maintains the address of the last byte accessed, incremented by one. For example, if the previous operation is either a Read or Write operation addressed to the address location n, the internal address counter would increment to address location n+1. When the EEPROM receives the Slave Addressing Byte with a Read operation (R/W bit set to "1"), it will respond an ACK and transmit the 8-bit data byte stored at address location n+1. The Master should not acknowledge the transfer but should generate a Stop condition so the IS24C01B/02B discontinues transmission. If 'n' is the last byte of the memory, the data from location '0' will be transmitted. (Refer to Figure 8. Current Address Read Diagram.) Sequential Read Sequential Reads can be initiated as either a Current Address Read or Random Address Read. After the IS24C01B/02B sends the initial byte sequence, the Master device now responds with an ACK, indicating it requires additional data from the IS24C01B/02B. The EEPROM continues to output data for each ACK received. The Master device terminates the sequential Read operation by pulling SDA High (no ACK) indicating the last data word to be read, followed by a Stop condition. The data output is sequential, with the data from address n followed by the data from address n+1,n+2 ... etc. The address counter increments by one automatically, allowing the entire memory contents to be serially read during sequential Read operation. When the memory address boundary of 127 or 255 (depending on the device) is reached, the address counter "rolls over" to address 0, and the device continues to output data. (Refer to Figure 10. Sequential Read Diagram). Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 5 IS24C01B ISSI IS24C02B (R) FIGURE 1. TYPICAL SYSTEM BUS CONFIGURATION Vcc SDA SCL Master Transmitter/ Receiver IS24Cxx FIGURE 2. OUTPUT ACKNOWLEDGE SCL from Master 1 8 9 Data Output from Transmitter tAA Data Output from Receiver tAA ACK STOP Condition SCL START Condition FIGURE 3. START AND STOP CONDITIONS SDA 6 Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 IS24C01B ISSI IS24C02B (R) FIGURE 4. DATA VALIDITY PROTOCOL Data Change SCL Data Stable Data Stable SDA FIGURE 5. SLAVE ADDRESS BIT 7 6 5 4 3 2 1 0 1 0 1 0 A2 A1 A0 R/W FIGURE 6. BYTE WRITE SDA Bus Activity S T A R T Device Address W R I T E M S B Data Byte Address A C K * S T O P A C K A C K L M S S B B R/W * = Don't care bit for IS24C01B Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 7 IS24C01B ISSI IS24C02B (R) FIGURE 7. PAGE WRITE SDA Bus Activity S T A R T W R I T E Device Address M S B Data (n) Byte Address (n) A C K A C K * Data (n+1) A C K S T O P Data (n+7) A C K A C K L S B R/W * = Don't care bit for IS24C01B FIGURE 8. CURRENT ADDRESS READ S T A R T R E A D Device Address SDA Bus Activity S T O P Data A C K M S B L S B N O A C K R/W FIGURE 9. RANDOM ADDRESS READ S T A R T Device Address SDA Bus Activity W R I T E Byte Address (n) A C K M S B S T A R T A C K * L S B R/W Device Address R E A D S T O P Data n A C K N O A C K DUMMY WRITE * = Don't care bit for IS24C01B 8 Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 IS24C01B ISSI IS24C02B (R) FIGURE 10. SEQUENTIAL READ Device Address SDA Bus Activity R E A D Data Byte n A C K Data Byte n+1 A C K Data Byte n+2 A C K S T O P Data Byte n+X A C K N O R/W Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 A C K 9 IS24C01B ISSI IS24C02B (R) ABSOLUTE MAXIMUM RATINGS(1) Symbol VS VP TBIAS TSTG IOUT Parameter Supply Voltage Voltage on Any Pin Temperature Under Bias Storage Temperature Output Current Value -0.5 to +6.5 -0.5 to Vcc + 0.5 -55 to +125 -65 to +150 5 Unit V V C C mA Notes: 1. Stress greater than 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 sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. OPERATING RANGE (IS24C01B-2 & IS24C02B-2) Range Industrial Ambient Temperature -40C to +85C VCC 1.8V to 5.5V OPERATING RANGE (IS24C01B-3 & IS24C02B-3) Range Automotive Ambient Temperature -40C to +125C VCC 2.5V to 5.5V Note: Automotive data is preliminary. CAPACITANCE(1,2) Symbol CIN COUT Parameter Input Capacitance Output Capacitance Conditions VIN = 0V VOUT = 0V Max. 6 8 Unit pF pF Notes: 1. Tested initially and after any design or process changes that may affect these parameters. 2. Test conditions: TA = 25C, f = 1 MHz, Vcc = 5.0V. 10 Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 IS24C01B ISSI IS24C02B (R) AC WAVEFORMS Figure 11. Bus Timing tR tF tHIGH tLOW tSU:STO SCL tSU:STA tBUF tHD:DAT tHD:STA tSU:DAT SDAIN tAA tDH SDAOUT tSU:WP tHD:WP WP Figure 12. Write Cycle Timing SCL SDA 8th BIT ACK tWR WORD n STOP Condition Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 START Condition 11 IS24C01B ISSI IS24C02B (R) DC ELECTRICAL CHARACTERISTICS Industrial (TA = -40oC to +85oC), Automotive (TA = -40oC to +125oC) Symbol Parameter Test Conditions Min. Max. Unit VOL1 Output Low Voltage VCC = 1.8V, IOL = 0.15 mA -- 0.2 V VOL2 Output Low Voltage VCC = 2.5V, IOL = 3 mA -- 0.4 V VIH Input High Voltage VIL Input Low Voltage ILI Input Leakage Current ILO Output Leakage Current VCC X 0.7 VCC + 0.5 V -1.0 VCC X 0.3 V -- 3 A -- 3 A Min. Max. Unit VIN = VCC max. Notes: VIL min and VIH max are reference only and are not tested. POWER SUPPLY CHARACTERISTICS Industrial (TA = -40oC to +85oC), Automotive (TA = -40oC to +125oC) Symbol Parameter Test Conditions ICC1 Vcc Operating Current Read at 400 KHz (Vcc = 5V) -- 2.0 mA ICC2 Vcc Operating Current Write at 400 KHz (Vcc = 5V) -- 3.0 mA ISB1 Standby Current Vcc = 1.8V -- 1 A ISB2 Standby Current Vcc = 2.5V -- 2 A ISB3 Standby Current Vcc = 5.0V -- 6 A AC ELECTRICAL CHARACTERISTICS Industrial (TA = -40oC to +85oC) 1.8V-5.5V Symbol fSCL T tLow tHigh tBUF tSU:STA tSU:STO tHD:STA tHD:STO tSU:DAT tHD:DAT tSU:WP tHD:WP tDH tAA tR tF tWR Parameter SCL Clock Frequency Noise Suppression Time(1) Clock Low Period Clock High Period Bus Free Time Before New Transmission(1) Start Condition Setup Time Stop Condition Setup Time Start Condition Hold Time Stop Condition Hold Time Data In Setup Time Data In Hold Time WP pin Setup Time WP pin Hold Time Data Out Hold Time (SCL Low to SDA Data Out Change) Clock to Output (SCL Low to SDA Data Out Valid) SCL and SDA Rise Time(1) SCL and SDA Fall Time(1) Write Cycle Time Min. 0 -- 4.7 4 4.7 4 4 4 4 100 0 4 4.7 100 100 -- -- -- Max. 100 100 -- -- -- -- -- -- -- -- -- -- -- -- 3500 1000 300 10 2.5V-5.5V Min. 0 -- 1.2 0.6 1.2 0.6 0.6 0.6 0.6 100 0 0.6 1.2 50 50 -- -- -- Max. 400 50 -- -- -- -- -- -- -- -- -- -- -- -- 900 300 300 5 4.5V-5.5V Min. 0 -- 0.6 0.4 0.5 0.25 0.25 0.25 0.25 100 0 0.6 1.2 50 50 -- -- -- Max. 1000 50 -- -- -- -- -- -- -- -- -- -- -- -- 400 300 100 5 Unit KHz ns s s s s s s s ns ns s s ns ns ns ns ms Note: 1. This parameter is characterized but not 100% tested. 12 Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 IS24C01B ISSI IS24C02B (R) AC ELECTRICAL CHARACTERISTICS Automotive (TA = -40oC to +125oC) 2.5V-5.5V Symbol Parameter Min. Max. 4.5V-5.5V Min. Max. Unit fSCL SCL Clock Frequency 0 400 0 1000 KHz T Noise Suppression Time(1) -- 50 -- 50 ns tLow Clock Low Period 1.2 -- 0.6 -- s tHigh Clock High Period 0.6 -- 0.4 -- s Transmission(1) tBUF Bus Free Time Before New 1.2 -- 0.5 -- s tSU:STA Start Condition Setup Time 0.6 -- 0.25 -- s tSU:STO Stop Condition Setup Time 0.6 -- 0.25 -- s tHD:STA Start Condition Hold Time 0.6 -- 0.25 -- s tHD:STO Stop Condition Hold Time 0.6 -- 0.25 -- s tSU:DAT Data In Setup Time 100 -- 100 -- ns tHD:DAT Data In Hold Time 0 -- 0 -- ns tSU:WP WP pin Setup Time 0.6 -- 0.6 -- s tHD:WP WP pin Hold Time 1.2 -- 1.2 -- s tDH Data Out Hold Time (SCL Low to SDA Data Out Change) 50 -- 50 -- ns tAA Clock to Output (SCL Low to SDA Data Out Valid) 50 900 50 550 ns -- 300 -- 300 ns -- 300 -- 100 ns -- 10 -- 5 ms tR SCL and SDA Rise tF SCL and SDA Fall tWR Write Cycle Time Time(1) Time(1) Note: 1. This parameter is characterized but not 100% tested. Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04 13 IS24C01B ISSI IS24C02B (R) ORDERING INFORMATION Industrial Range: -40C to +85C Frequency Voltage Range Part Number Package 100 KHz 1.8V to 5.5V IS24C01B-2PI IS24C01B-2GI IS24C01B-2ZI 300-mil Plastic DIP Small Outline (JEDEC STD) TSSOP 100 KHz 1.8V to 5.5V IS24C02B-2PI IS24C02B-2GI IS24C02B-2ZI 300-mil Plastic DIP Small Outline (JEDEC STD) TSSOP Note: The specification allows for higher speed. Please see AC Characteristics (2.5V-5.5V or 4.5V-5.5V) ORDERING INFORMATION Industrial Range: -40C to +85C, Lead-free Frequency Voltage Range Part Number Package 100 KHz 1.8V to 5.5V IS24C01B-2PLI IS24C01B-2GLI IS24C01B-2ZLI 300-mil Plastic DIP Small Outline (JEDEC STD) TSSOP 100 KHz 1.8V to 5.5V IS24C02B-2PLI IS24C02B-2GLI IS24C02B-2ZLI 300-mil Plastic DIP Small Outline (JEDEC STD) TSSOP Note: The specification allows for higher speed. Please see AC Characteristics (2.5V-5.5V or 4.5V-5.5V) 14 Integrated Silicon Solution, Inc. -- www.issi.com -- 1-800-379-4774 Rev. 00B 11/15/04