CAT24C01B 1K-Bit Serial EEPROM FEATURES ■ 2-Wire Serial Interface ■ 1,000,000 Program/Erase Cycles ■ 1.8 to 6.0Volt Operation ■ 100 Year Data Retention ■ Low Power CMOS Technology ■ 8-pin DIP, 8-pin SOIC, 8 pin TSSOP or 8-pin MSOP ■ 4-Byte Page Write Buffer ■ Commercial, Industrial and Automotive Temperature Ranges ■ Self-Timed Write Cycle with Auto-Clear DESCRIPTION The CAT24C01B is a 1K-bit Serial CMOS EEPROM internally organized as 128 words of 8 bits each. Catalyst’s advanced CMOS technology substantially reduces device power requirements. The CAT24C01B features a 4-byte page write buffer. The device operates via a 2wire serial interface and is available in 8-pin DIP, 8-pin SOIC, 8-pin TSSOP or 8-pin MSOP. PIN CONFIGURATION BLOCK DIAGRAM SOIC Package (J) DIP Package (P) 1 2 3 4 NC NC NC VSS 8 7 6 5 VCC TEST SCL SDA 1 2 3 4 NC NC NC VSS 8 7 6 5 EXTERNAL LOAD VCC TEST SCL SDA VCC VSS 5020 FHD F01 MSOP Package (R) 1 2 3 4 NC NC NC VSS 8 7 6 5 SDA TSSOP Package (U) VCC TEST SCL SDA NC NC NC VSS 1 2 3 4 8 7 6 5 VCC TEST SCL SDA WORD ADDRESS BUFFERS COLUMN DECODERS START/STOP LOGIC XDEC E2PROM EEPROM CONTROL LOGIC DATA IN STORAGE PIN FUNCTIONS Pin Name SENSE AMPS SHIFT REGISTERS DOUT ACK Function NC No Connect SDA Serial Data/Address SCL Serial Clock VCC +1.8V to +6.0V Power Supply VSS Ground TEST Test Input (GND, VCC or Floating) © 1999 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice HIGH VOLTAGE/ TIMING CONTROL SCL 1 STATE COUNTERS Doc. No. 25085-00 7/99 S-1 CAT24C01B ABSOLUTE MAXIMUM RATINGS* *COMMENT Temperature Under Bias ................. –55°C to +125°C Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability. Storage Temperature ....................... –65°C to +150°C Voltage on Any Pin with Respect to Ground(1) ........... –2.0V to +VCC + 2.0V VCC with Respect to Ground ............... –2.0V to +7.0V Package Power Dissipation Capability (Ta = 25°C) .................................. 1.0W Lead Soldering Temperature (10 secs) ............ 300°C Output Short Circuit Current(2) ........................ 100mA RELIABILITY CHARACTERISTICS Symbol Units Reference Test Method 1,000,000 Cycles/Byte MIL-STD-883, Test Method 1033 Data Retention 100 Years MIL-STD-883, Test Method 1008 VZAP(3) ESD Susceptibility 2000 Volts MIL-STD-883, Test Method 3015 ILTH(3)(4) Latch-up 100 mA NEND(3) TDR (3) Parameter Min. Endurance Max. JEDEC Standard 17 D.C. OPERATING CHARACTERISTICS VCC = +1.8V to +6.0V, unless otherwise specified. Limits Symbol Max. Units Test Conditions Power Supply Current 3 mA fSCL = 100 KHz Standby Current (VCC = 5.0V) 0 µA VIN = GND or VCC ILI Input Leakage Current 10 µA VIN = GND to VCC ILO Output Leakage Current 10 µA VOUT = GND to VCC VIL Input Low Voltage –1 VCC x 0.3 V VIH Input High Voltage VCC x 0.7 VCC + 0.5 V ICC ISB (5) Parameter Min. Typ. VOL1 Output Low Voltage (VCC = 3.0V) 0.4 V IOL = 3 mA VOL2 Output Low Voltage (VCC = 1.8V) 0.5 V IOL = 1.5 mA CAPACITANCE TA = 25°C, f = 1.0 MHz, VCC = 5V Symbol Test Max. Units Conditions CI/O(3) Input/Output Capacitance (SDA) 8 pF VI/O = 0V CIN(3) Input Capacitance (A0, A1, A2, SCL, WP) 6 pF VIN = 0V Note: (1) The minimum DC input voltage is –0.5V. During transitions, inputs may undershoot to –2.0V for periods of less than 20 ns. Maximum DC voltage on output pins is VCC +0.5V, which may overshoot to VCC + 2.0V for periods of less than 20ns. (2) Output shorted for no more than one second. No more than one output shorted at a time. (3) This parameter is tested initially and after a design or process change that affects the parameter. (4) Latch-up protection is provided for stresses up to 100 mA on address and data pins from –1V to VCC +1V. (5) Standby Current (ISB) = 0µA (<900nA). Doc. No. 25085-00 7/99 S-1 2 CAT24C01B A.C. CHARACTERISTICS VCC = +1.8V to +6.0V, CL=1TTL Gate and 100pF (unless otherwise specified). Read & Write Cycle Limits Symbol Parameter 1.8V, 2.5V Min. Max. 4.5V-5.5V Min. Max. Units FSCL Clock Frequency 100 400 kHz TI(1) Noise Suppression Time Constant at SCL, SDA Inputs 100 100 ns tAA SCL Low to SDA Data Out and ACK Out 3.5 1 µs tBUF(1) Time the Bus Must be Free Before a New Transmission Can Start tHD:STA Start Condition Hold Time tLOW 4.7 1.2 µs 4 0.6 µs Clock Low Period 4.7 1.2 µs tHIGH Clock High Period 4 0.6 µs tSU:STA Start Condition Setup Time (for a Repeated Start Condition) 4.7 0.6 µs tHD:DAT Data In Hold Time 0 0 ns tSU:DAT Data In Setup Time 250 100 ns tR(1) SDA and SCL Rise Time 1 0.3 µs SDA and SCL Fall Time 300 300 ns tF (1) tSU:STO Stop Condition Setup Time 4.7 0.6 µs tDH Data Out Hold Time 100 100 ns Power-Up Timing(1)(2) Symbol Parameter Max. Units tPUR Power-up to Read Operation 1 ms tPUW Power-up to Write Operation 1 ms Write Cycle Limits Symbol Parameter tWR Write Cycle Time Min. Typ. Max Units 10 ms interface circuits are disabled, SDA is allowed to remain high, and the device does not respond to its input. The write cycle time is the time from a valid stop condition of a write sequence to the end of the internal program/erase cycle. During the write cycle, the bus Note: (1) This parameter is tested initially and after a design or process change that affects the parameter. (2) tPUR and tPUW are the delays required from the time VCC is stable until the specified operation can be initiated. 3 Doc. No. 25085-00 7/99 S-1 CAT24C01B FUNCTIONAL DESCRIPTION SDA: Serial Data/Address The CAT24C01B bidirectional serial data/address pin is used to transfer data into and out of the device. The SDA pin is an open drain output and can be wired with other open drain or open collector outputs. The CAT24C01B uses a 2-wire data transmission protocol. The protocol defines any device that sends data to the bus to be a transmitter and any device receiving data to be a receiver. Data transfer is controlled by the Master device which generates the serial clock and all START and STOP conditions for bus access. The CAT24C01B operates as a Slave device. Both the Master and Slave devices can operate as either transmitter or receiver, but the Master device controls which mode is activated. 2-WIRE BUS PROTOCOL The following defines the features of the 2-wire bus protocol: (1) Data transfer may be initiated only when the bus is not busy. PIN DESCRIPTIONS (2) During a data transfer, the data line must remain stable whenever the clock line is high. Any changes in the data line while the clock line is high will be interpreted as a START or STOP condition. SCL: Serial Clock The CAT24C01B serial clock input pin is used to clock all data transfers into or out of the device. This is an input pin. Figure 1. Bus Timing tF tHIGH tLOW tR tLOW SCL tSU:STA tHD:STA tHD:DAT tSU:DAT tSU:STO SDA IN tAA tBUF tDH SDA OUT 5020 FHD F03 Figure 2. Write Cycle Timing SCL SDA 8TH BIT BYTE n ACK tWR STOP CONDITION START CONDITION ADDRESS 5020 FHD F04 Figure 3. Start/Stop Timing SDA SCL 5020 FHD F05 START BIT Doc. No. 25085-00 7/99 S-1 STOP BIT 4 CAT24C01B START Condition (with the R/W bit set to zero) to the Slave device. After the Slave generates an acknowledge, the Master device transmits the data byte to be written into the addressed memory location. The CAT24C01B acknowledge once more and the Master generates the STOP condition, at which time the device begins its internal programming cycle to nonvolatile memory. While this internal cycle is in progress, the device will not respond to any request from the Master device. 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 CAT24C01B monitors the SDA and SCL lines and will not respond until this condition is met. STOP Condition A LOW to HIGH transition of SDA when SCL is HIGH determines the STOP condition. All operations must end with a STOP condition. Page Write Acknowledge The CAT24C01B writes up to 4 bytes of data in a single write cycle, using the Page Write operation. The Page Write operation is initiated in the same manner as the Byte Write operation, however instead of terminating after the initial word is transmitted, the Master is allowed to send up to 3 additional bytes. After each byte has been transmitted the CAT24C01B will respond with an acknowledge, and internally increment the low order address bits by one. The high order bits remain unchanged. After a successful data transfer, each receiving device is required to generate an acknowledge. The Acknowledging device pulls down the SDA line during the ninth clock cycle, signaling that it received the 8 bits of data. The CAT24C01B responds with an acknowledge after receiving a START condition and its word address. If the device has been selected along with a write operation, it responds with an acknowledge after receiving each 8bit byte. If the Master transmits more than 4 bytes prior to sending the STOP condition, the address counter ‘wraps around,’ and previously transmitted data will be overwritten. When the CAT24C01B is in a READ mode it transmits 8 bits of data, releases the SDA line, and monitors the line for an acknowledge. Once it receives this acknowledge, the CAT24C01B will continue to transmit data. If no acknowledge is sent by the Master, the device terminates data transmission and waits for a STOP condition. Once all 4 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 CAT24C01B in a single write cycle. Acknowledge Polling WRITE OPERATIONS The disabling of the inputs can be used to take advan- Byte Write In the Byte Write mode, the Master device sends the START condition and the word address information Figure 4. Acknowledge Timing SCL FROM MASTER 1 8 9 DATA OUTPUT FROM TRANSMITTER DATA OUTPUT FROM RECEIVER START ACKNOWLEDGE 5020 FHD F06 5 Doc. No. 25085-00 7/99 S-1 CAT24C01B Sequential Read tage of the typical write cycle time. Once the stop condition is issued to indicate the end of the host’s write operation, the CAT24C01B initiates the internal write cycle. ACK polling can be initiated immediately. This involves issuing the start condition followed by the byte address for a write operation. If the CAT24C01B is still busy with the write operation, no ACK will be returned. If the CAT24C01B has completed the write operation, an ACK will be returned and the host can then proceed with the next read or write operation. The Sequential READ operation can be initiated after the 24C01B sends the initial 8-bit byte requested, the Master will respond with an acknowledge which tells the device it requires more data. The CAT24C01B will continue to output an 8-bit byte for each acknowledge sent by the Master. The operation is terminated when the Master fails to respond with an acknowledge, thus sending the STOP condition. The data being transmitted from the CAT24C01B is output sequentially with data from address N followed by data from address N+1. The READ operation address counter increments all of the CAT24C01B address bits so that the entire memory array can be read during one operation. If more than bytes are read out, the counter will “wrap around” and continue to clock out data bytes. READ OPERATIONS The READ operation for the CAT24C01B is initiated in the same manner as the write operation with the one exception that the R/W bit is set to a one. Two different READ operations are possible: Byte READ and Sequential READ. It should be noted that the ninth clock cycle of the read operation is not a "don't care." To terminate a read operation, the master must either issure a stop condition during the ninth cycle or hold SDA HIGH during the ninth clock cycle and then issue a stop condition. Byte Read To initiate a read operation, the master sends a start condition followed by a seven bit word address and a read bit. The CAT24C01B responds with an acknowledge and then transmits the eight bits of data. The read operation is terminated by the master; by not responding with an acknowledge and by issuing a stop condition. Refer to Figure 7 for the start word address, read bit, acknowledge and data transfer sequence. Figure5. Byte Write Timing BUS ACTIVITY: SDA LINE S T A WORD R ADDRESS(n) T S T O P S P BUS ACTIVITY: M S B LRA S / C BW K DATA n A C K Figure 6. Page Write Timing BUS ACTIVITY: SDA LINE BUS ACTIVITY: Doc. No. 25085-00 7/99 S-1 S T A R T WORD ADDRESS(n) DATA n S T O P DATA n+3 DATA n+1 P S M S B LRA S / C BW K A C K 6 A C K A C K CAT24C01B Figure 7. Byte Read Timing BUS ACTIVITY MASTER SDA LINE S T A WORD R ADDRESS(n) T S T O P DATA n P S BUS ACTIVITY CAT24C01B LRA S / C BW K M S B A C K Figure 8. Sequential Read Timing A C K A C K BUS ACTIVITY MASTER ADDRESS S T O P A C K SDA LINE BUS ACTIVITY CAT24C01B P R A / C WK DATA n DATA n+1 DATA n+x DATA n+2 ORDERING INFORMATION Prefix CAT Optional Company ID Device # 24C01B Product Number 24C01B: 1K Suffix J I -1.8 Temperature Range Blank = Commercial (0˚ - 70˚C) I = Industrial (-40˚ - 85˚C) A = Automotive (-40˚ - 105˚C)* Package P: PDIP J: SOIC (JEDEC) U: TSSOP R: MSOP TE13 Tape & Reel TE13: 2000/Reel Operating Voltage Blank: 2.5V - 6.0V 1.8: 1.8V - 6.0V * -40˚ to +125˚C is available upon request Notes: (1) The device used in the above example is a 24C01BJI-1.8TE13 (SOIC, Industrial Temperature, 1.8 Volt to 6 Volt Operating Voltage, Tape & Reel) 7 Doc. No. 25085-00 7/99 S-1