M14C04

M14C16 M14C04 Memory Card IC 16/4 Kbit Serial I²C Bus EEPROM s Two Wire I2C Serial Interface Supports 400 kHz Protocol Single Supply Voltage (2.5 V to 5.5 V) Hardware Write Control BYTE and PAGE WRITE (up to 16 Bytes) BYTE, RANDOM and SEQUENTIAL READ Modes 2 2 s s s s 2 2 s s s s s s Self-Timed Programming Cycle Automatic Address Incrementing Enhanced ESD/Latch-Up Behaviour 1 Million Erase/Write Cycles (minimum) 40 Year Data Retention (minimum) 5 ms Programming Time (typical) Micromodule (D20) DESCRIPTION Each device is an electrically erasable programmable memory (EEPROM) fabricated with STMicroelectronics’s High Endurance, Single Polysilicon, CMOS technology. This guarantees an endurance typically well above one million Erase/Write cycles, with a data retention of 40 years. The memory operates with a power supply as low as 2.5 V. The M14C16 and M14C04 are each available in wafer form (either sawn or unsawn) and in micromodule form (on film). Each memory is compatible with the I2C memory standard. This is a two wire serial interface that Table 1. Signal Names SDA Serial Data/Address Input/ Output Serial Clock Write Control Supply Voltage Ground Wafer Figure 1. Logic Diagram VCC SCL WC M14xxx SDA SCL WC VCC GND GND AI02217 March 1999 1/13 M14C16, M14C04 Figure 2. D20 Contact Connections master acknowledges the receipt of the data byte in the same way. Data transfers are terminated by a STOP condition after an Ack for WRITE, and after a NoACK for READ. Power On Reset: V CC Lock-Out Write Protect In order to prevent data corruption and inadvertent write operations during power up, a Power On Reset (POR) circuit is included. The internal reset is held active until the V CC voltage has reached the POR threshold value, and all operations are disabled – the device will not respond to any command. In the same way, when VCC drops from the operating voltage, below the POR threshold value, all operations are disabled and the device will not respond to any command. A stable and valid V CC must be applied before applying any logic signal. SIGNAL DESCRIPTION Serial Clock (SCL) The SCL input pin is used to synchronize all data in and out of the memory. A pull up resistor can be connected from the SCL line to VCC. (Figure 3 indicates how the value of the pull-up resistor can be calculated). Serial Data (SDA) The SDA pin is bi-directional, and is used to transfer data in or out of the memory. It is an open drain output that may be wire-OR’ed with other open drain or open collector signals on the bus. A pull up resistor must be connected from the SDA bus to VCC. (Figure 3 indicates how the value of the pull-up resistor can be calculated). Write Control (WC ) The hardware Write Control contact (WC ) is useful for protecting the entire contents of the memory from inadvertent erase/write. The Write Control signal is used to enable (WC=VIL) or disable VCC WC GND SCL SDA AI02168 uses a bi-directional data bus and serial clock. The memory carries a built-in 7-bit unique Device Type Identifier code (1010xxx, for the M14C16, and 101000x, for the M14C04, as shown in Table 3) in accordance with the I2C bus definition. Only one memory can be attached to each I2C bus. The memory behaves as a slave device in the I2C protocol, with all memory operations synchronized by the serial clock. Read and write operations are initiated by a START condition, generated by the bus master. The START condition is followed by the Device Select Code which is composed of a stream of 7 bits (1010xxx, for the M14C16, and 101000x, for the M14C04, as shown in Table 3), plus one read/write bit (R/W ) and is terminated by an acknowledge bit. When writing data to the memory, the memory inserts an acknowledge bit during the 9th bit time, following the bus master’s 8-bit transmission. When data is read by the bus master, the bus Table 2. Absolute Maximum Ratings 1 Symbol TA TSTG VIO VCC VESD Parameter Ambient Operating Temperature Storage Temperature Input or Output range Supply Voltage Value 0 to 70 Wafer form Module form -65 to 150 -40 to 120 -0.6 to 6.5 -0.3 to 6.5 4000 400 Unit °C °C V V V V Electrostatic Discharge Voltage (Human Body model) 2 Electrostatic Discharge Voltage (Machine model) 3 Note: 1. Except for the rating “Operating Temperature Range”, stresses above those listed in the Table “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the ST SURE Program and other relevant quality documents. 2. MIL-STD-883C, 3015.7 (100 pF, 1500 Ω) 3. EIAJ IC-121 (Condition C) (200 pF, 0 Ω) 2/13 M14C16, M14C04 (WC =VIH) write instructions to the entire memory area. When unconnected, the WC input is internally read as VIL and write operations are allowed. When WC=1, Device Select and Address bytes are acknowledged, Data bytes are not acknowledged. Please see the Application Note AN404 for a more detailed description of the Write Control feature. DEVICE OPERATION The memory device supports the I2C protocol, as summarized in Figure 4. Any device that sends data on to the bus is defined to be a transmitter, and any device that reads the data to be a receiver. The device that controls the data transfer is known as the master, and the other as the slave. A data transfer can only be initiated by the master, which will also provide the serial clock for synchronization. The memory device is always a slave device in all communication. Start Condition START is identified by a high to low transition of the SDA line while the clock, SCL, is stable in the high state. A START condition must precede any data transfer command. The memory device continuously monitors (except during a programming cycle) the SDA and SCL lines for a START condition, and will not respond unless one is given. Stop Condition STOP is identified by a low to high transition of the SDA line while the clock SCL is stable in the high state. A STOP condition terminates communication between the memory device and the bus master. A STOP condition at the end of a Read command, after (and only after) a NoACK, forces the memory device into its standby state. A STOP condition at the end of a Write command triggers the internal EEPROM write cycle. Acknowledge Bit (ACK) An acknowledge signal is used to indicate a successful data transfer. The bus transmitter, either master or slave, will release the SDA bus after sending 8 bits of data. During the 9th clock pulse period the receiver pulls the SDA bus low to acknowledge the receipt of the 8 data bits. Data Input During data input, the memory device samples the SDA bus signal on the rising edge of the clock, SCL. For correct device operation, the SDA signal must be stable during the clock low-to-high transition, and the data must change only when the SCL line is low. Memory Addressing To start communication between the bus master and the slave memory, the master must initiate a START condition. Following this, the master sends 8 bits to the SDA bus line (with the most significant bit first). These bits represent the Device Select Code (7 bits) and a RW bit. The seven most significant bits of the Device Select Code are the Device Type Identifier, according to the I2C bus definition. For the memory device, the seven bits are fixed as shown in Table 3. The 8th bit is the read or write bit (RW). This bit is set to ‘1’ for read and ‘0’ for write operations. If a match occurs on the Device Select Code, the corresponding memory gives an acknowledgment on the SDA bus during the 9 th bit time. If the memory does not match the Device Select code, it will deselect itself from the bus, and go into stand-by mode. Figure 3. Maximum R L Value versus Bus Capacitance (CBUS) for an I2C Bus VCC 20 Maximum RP value (kΩ) 16 RL 12 8 4 0 10 100 CBUS (pF) AI01665 RL SDA MASTER fc = 100kHz fc = 400kHz SCL CBUS CBUS 1000 3/13 M14C16, M14C04 Figure 4. I2C Bus Protocol SCL SDA START CONDITION SDA INPUT SDA CHANGE STOP CONDITION SCL 1 2 3 7 8 9 SDA MSB ACK START CONDITION SCL 1 2 3 7 8 9 SDA MSB ACK STOP CONDITION AI00792 Write Operations Following a START condition the master sends a Device Select code with the RW bit set to ’0’, as shown in Table 4. The memory acknowledges it and waits for a byte address, which provides access to the memory area. After receipt of the address, the memory again responds with an acknowledge and waits for the data byte. Writing in the memory may be inhibited if input pin WC is taken high. Any write command with WC =1 (during a period of time from the START condition until the end of the address) will not modify the memory content and will NOT be acknowledged on data bytes, as shown in Figure 5. Table 3. Device Select Code 1 Device Code b7 M14C16 Select M14C04 Select 1 1 b6 0 0 b5 1 1 b4 0 0 b3 A10 0 Chip Enable b2 A9 0 b1 A8 A8 RW b0 RW RW Note: 1. A10, A9 and A8 correspond to the most significant bits of the memory array address word. 4/13 M14C16, M14C04 Byte Write In the Byte Write mode, after the Device Select code and the address, the master sends one data byte. If the addressed location is write protected by the WC pin, the memory replies with a NoACK, and the location is not modified. If, instead, the WC pin has been held at 0, as shown in Figure 6, the memory replies with an ACK. The master terminates the transfer by generating a STOP condition. Page Write The Page Write mode allows up to 16 bytes to be written in a single write cycle, provided that they are all located in the same ’row’ in the memory: that is the most significant memory address bits (b10-b4 for the M14C16 and b8-b4 for the M14C04) are the same. The master sends from one up to 16 bytes of data, each of which is acknowledged by the memory if the WC pin is low. If the WC pin is high, each data byte is followed by a NoACK and the location is not modified. After each byte is transferred, the internal byte address counter (the four least significant bits only) is incremented. The transfer is terminated by the master generating a STOP condition. Care must be taken to avoid address counter ’roll-over’ which could result in data being overwritten. Note that, for any byte or page write mode, the generation by the master of the STOP condition starts the internal memory program cycle. This STOP condition triggers an internal memory program cycle only if the STOP condition is internally decoded immediately after the ACK bit; any STOP condition decoded out of this "10th bit" time slot will not trigger the internal programming cycle. All inputs are disabled until the completion of this cycle and the Memory will not respond to any request. Minimizing System Delays by Polling On ACK During the internal write cycle, the memory disconnects itself from the bus, and copies the data from its internal latches to the memory cells. The maximum write time (t w) is indicated in Table 5, but the Figure 5. Write Mode Sequences with WC=1 WC ACK BYTE WRITE START DEV SEL R/W ACK NO ACK DATA IN STOP ACK NO ACK DATA IN 1 BYTE ADDR WC ACK PAGE WRITE START DEV SEL R/W NO ACK DATA IN 3 BYTE ADDR DATA IN 2 WC (cont'd) NO ACK PAGE WRITE (cont'd) NO ACK DATA IN N STOP AI02803B 5/13 M14C16, M14C04 Table 4. Operating Modes Mode Current Address Read Random Address Read ‘1’ Sequential Read Byte Write Page Write Note: 1. X = VIH or VIL. RW bit ‘1’ ‘0’ WC 1 X X Bytes 1 1 Initial Sequence START, Device Select, RW = ‘1’ START, Device Select, RW = ‘0’, Address reSTART, Device Select, RW = ‘1’ X X VIL VIL ≥1 1 ≤ 16 ‘1’ ‘0’ ‘0’ Similar to Current or Random Mode START, Device Select, RW = ‘0’ START, Device Select, RW = ‘0’ Figure 6. Write Mode Sequences with WC=0 WC ACK BYTE WRITE START DEV SEL R/W ACK DATA IN STOP ACK DATA IN 1 ACK DATA IN 2 ACK BYTE ADDR WC ACK PAGE WRITE START DEV SEL R/W ACK DATA IN 3 BYTE ADDR WC (cont'd) ACK PAGE WRITE (cont'd) DATA IN N ACK STOP AI02804 typical time is shorter. To make use of this, an ACK polling sequence can be used by the master. The sequence, as shown in Figure 7, is as follows: – Initial condition: a Write is in progress. – Step 1: the master issues a START condition followed by a device select byte (first byte of the new instruction). – Step 2: if the memory is busy with the internal write cycle, no ACK will be returned and the master goes back to Step 1. If the memory has terminated the internal write cycle, it responds 6/13 M14C16, M14C04 Figure 7. Write Cycle Polling Flowchart using ACK WRITE Cycle in Progress START Condition DEVICE SELECT with RW = 0 NO First byte of instruction with RW = 0 already decoded by M14xxx ACK Returned YES NO Next Operation is Addressing the Memory YES ReSTART Send Byte Address STOP Proceed WRITE Operation Proceed Random Address READ Operation AI02165 with an ACK, indicating that the memory is ready to receive the second part of the next instruction (the first byte of this instruction having been sent during Step 1). Read Operations Read operations are independent of the state of the WC pin. On delivery, the memory content is set at all “1’s” (FFh). Current Address Read The memory has an internal address counter. Each time a byte is read, this counter is incremented. For the Current Address Read mode, following a START condition, the master sends a device select with the RW bit set to ‘1’. The memory acknowledges this, and outputs the byte addressed by the internal address counter. The counter is then incremented. The master must not acknowledge the byte output, and terminates the transfer with a STOP condition, as shown in Figure 8. Random Address Read A dummy write is performed to load the address into the address counter, as shown in Figure 8. This is followed by another START condition from the master and the device select is repeated with the RW bit set to ‘1’. The memory acknowledges this, and outputs the byte addressed. The master must not acknowledge the byte output, and terminates the transfer with a STOP condition. Sequential Read This mode can be initiated with either a Current Address Read or a Random Address Read. However, in this case the master does acknowledge the data byte output, and the memory continues to output the next byte in sequence. To terminate the stream of bytes, the master must not acknowledge the last byte output, and must generate a STOP condition. The output data comes from consecutive addresses, with the internal address counter automatically incremented after each byte output. 7/13 M14C16, M14C04 Figure 8. Read Mode Sequences ACK CURRENT ADDRESS READ START DEV SEL R/W NO ACK DATA OUT STOP ACK DEV SEL * START R/W ACK RANDOM ADDRESS READ START DEV SEL * R/W ACK NO ACK DATA OUT STOP NO ACK ACK AI01942 BYTE ADDR ACK SEQUENTIAL CURRENT READ START DEV SEL R/W ACK ACK DATA OUT 1 DATA OUT N STOP ACK SEQUENTIAL RANDOM READ START DEV SEL * R/W ACK DEV SEL * START ACK BYTE ADDR DATA OUT 1 R/W ACK NO ACK DATA OUT N STOP Note: 1. The seven most significant bits of the Device Select bytes of a Random Read (in the 1 st and 3rd bytes) must be identical. After the last memory address, the address counter will ‘roll-over’ and the memory will continue to output data from the start of the memory block. Acknowledge in Read Mode In all read modes the memory waits for an acknowledgment during the 9th bit time. If the master does not pull the SDA line low during this time, the memory terminates the data transfer and switches to its standby state. 8/13 M14C16, M14C04 Table 5. AC Characteristics (TA = 0 to 70 °C; VCC = 2.5 V to 5.5 V) Symbol Alt. Parameter Fast I2C 400 kHz Min tCH1CH2 2 I2C 100 kHz Min Max 1000 300 20 20 4700 4000 4000 0 4.7 250 4000 4.7 1000 300 Unit Max 300 300 tR tF tR tF tSU:STA tHIGH tHD:STA tHD:DAT tLOW tSU:DAT tSU:STO tBUF tAA tDH fSCL tWR Clock Rise Time Clock Fall Time SDA Rise Time SDA Fall Time Clock High to Input Transition Clock Pulse Width High Input Low to Clock Low (START) Clock Low to Input Transition Clock Pulse Width Low Input Transition to Clock Transition Clock High to Input High (STOP) Input High to Input Low (Bus Free) Clock Low to Data Out Valid Data Out Hold Time After Clock Low Clock Frequency Write Time 200 20 20 600 600 600 0 1.3 100 600 1.3 ns ns ns ns ns ns ns µs µs ns ns µs tCL1CL2 2 tDH1DH2 2 tDL1DL2 2 tCHDX 1 tCHCL tDLCL tCLDX tCLCH tDXCX tCHDH tDHDL tCLQV tCLQX fC tW 300 300 1000 200 400 10 3500 ns ns 100 10 kHz ms Note: 1. For a reSTART condition, or following a write cycle. 2. Sampled only, not 100% tested Table 6. DC Characteristics (TA = 0 to 70 °C; VCC = 2.5 V to 5.5 V) Symbol ILI ILO ICC Parameter Input Leakage Current Output Leakage Current Supply Current VCC =2.5V, fc=400kHz (rise/fall time < 30ns) Supply Current (Stand-by) Input Low Voltage (SCL, SDA) Input High Voltage (SCL, SDA) Input Low Voltage (WC) Input High Voltage (WC) Output Low Voltage IOL = 3 mA, VCC = 5 V IOL = 2.1 mA, VCC = 2.5 V VIN = VSS or VCC , VCC = 5 V VIN = VSS or VCC , VCC = 2.5 V - 0.3 0.7 VCC - 0.3 VCC - 0.5 1 20 1 0.3 VCC VCC + 1 0.5 VCC + 1 0.4 0.4 mA µA µA V V V V V V Test Condition 0 V ≤ VIN ≤ VCC 0 V ≤ VOUT ≤ VCC, SDA in Hi-Z VCC=5V, fc=400kHz (rise/fall time < 30ns) Min. Max. ±2 ±2 2 Unit µA µA mA ICC1 VIL VIH VIL VIH VOL 9/13 M14C16, M14C04 Figure 9. AC Waveforms tCHCL SCL tDLCL SDA IN tCHDX START CONDITION tCLDX SDA INPUT SDA CHANGE STOP & BUS FREE tDHDL tDXCX tCHDH tCLCH SCL tCLQV SDA OUT DATA VALID tCLQX DATA OUTPUT SCL tW SDA IN tCHDH STOP CONDITION WRITE CYCLE tCHDX START CONDITION AI00795B Table 7. AC Measurement Conditions Input Rise and Fall Times Input Pulse Voltages Input and Output Timing Reference Voltages ≤ 50 ns 0.2VCC to 0.8VCC 0.3VCC to 0.7VCC Figure 10. AC Testing Input Output Waveforms 0.8VCC 0.7VCC 0.3VCC AI00825 0.2VCC Table 8. Input Parameters1(TA = 25 °C, f = 400 kHz) Symbol CIN CIN tNS Parameter Input Capacitance (SDA) Input Capacitance (other pins) Low Pass Filter Input Time Constant (SCL and SDA) 100 Test Condition Min. Max. 8 6 400 Unit pF pF ns Note: 1. Sampled only, not 100% tested. 10/13 M14C16, M14C04 Table 9. Ordering Information Scheme Example: M14C04 W D20 Memory Capacity 16 04 16 Kbit 4 Kbit D20 W2 W4 Operating Voltage W 2.5 V to 5.5 V S2x S4x Delivery Form Module on Super 35 mm film Unsawn wafer (275 µm ± 25 µm thickness) Unsawn wafer (180 µm ± 15 µm thickness) Sawn wafer (275 µm ± 25 µm thickness) Sawn wafer (180 µm ± 15 µm thickness) GND at top right GND at bottom right GND at bottom left GND at top left where “x” indicates the sawing orientation, as follows (and as shown in Figure 11) 1 2 3 4 ORDERING INFORMATION Devices are shipped from the factory with the memory content set at all ‘1’s (FFh). The notation used for the device number is as shown in Table 9. For a list of available options (speed, package, etc.) or for further information on any aspect of this device, please contact the ST Sales Office nearest to you. Sawn wafers are scribed and mounted in a frame on adhesive tape. The orientation is defined by the position of the GND pad on the die, viewed with active area of product visible, relative to the notches of the frame (as shown in Figure 11). The orientation of the die with respect to the plastic frame notches is specified by the Customer. One further concern, when specifying devices to be delivered in this form, is that wafers mounted on adhesive tape must be used within a limited period from the mounting date: – two months, if wafers are stored at 25°C, 55% relative humidity – six months, if wafers are stored at 4°C, 55% relative humidity 11/13 M14C16, M14C04 Figure 11. Sawing Orientation VIEW: WAFER FRONT SIDE GND GND GND GND ORIENTATION 1 2 3 4 AI02171 12/13 M14C16, M14C04 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. © 1998 STMicroelectronics - All Rights Reserved The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com 13/13