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| 4K X76F400 Secure SerialFlash 512 x 8 bit FEATURES * 64-bit password security * One array (496 bytes) two passwords (16 bytes) --Read password --Write password * Programmable passwords * Retry counter register --Allows 8 tries before clearing of the array * 32-bit response to reset (RST input) * 8 byte sector write mode * 1MHz clock rate * 2-wire serial interface * Low power CMOS --2.5 to 5.5V operation --Standby current less than 1A --Active current less than 3 mA * High reliability endurance: --100,000 write cycles * Data retention: 100 years * Available in: --8-lead, SOIC,TSSOP DESCRIPTION The X76F400 is a password access security supervisor, containing one 3968-bit Secure SerialFlash array. Access to the memory array can be controlled by two 64-bit passwords. These passwords protect read and write operations of the memory array. The X76F400 features a serial interface and software protocol allowing operation on a popular 2-wire bus. The bus signals are a clock input (SCL) and a bi-directional data input and output (SDA). The X76F400 also features a synchronous response to reset, providing an automatic output of a hard-wired 32-bit data stream, thereby meeting the industry standard for memory cards. The X76F400 utilizes Xicor's proprietary Direct WriteTM cell, providing a minimum endurance of 100,000 cycles and a minimum data retention of 100 years. BLOCK DIAGRAM Retry Counter Data Transfer Array Access Enable Interface Logic Password Array and Password Verification Logic RST ISO Reset Response Register 496 Byte EEPROM Array SCL SDA Erase Logic www..com REV 1.0 7/5/00 www..com www.xicor.com Characteristics subject to change without notice. 1 of 14 X76F400 PIN DESCRIPTIONS Serial Clock (SCL) The SCL input is used to clock all data into and out of the device. Serial Data (SDA) SDA is an open drain serial data input/output pin. During a read cycle, data is shifted out on this pin. During a write cycle, data is shifted in on this pin. In all other cases, this pin is in a high impedance state. Reset (RST) RST is a device reset pin. When RST is pulsed high, the X76F400 will output 32 bits of fixed data, which conforms to the standard for "synchronous responseto-reset." The part must not be in a write cycle for the response-to-reset to occur. See Figure 7. If power is interrupted during the response-to-reset, the responseto-reset will be aborted and the part will return to the standby state. The response to reset is "mask programmable" only! DEVICE OPERATION The X76F400 memory array consists of 62 8-byte sectors. Read or write access to the array always begins at the first address of the sector. Read operations then can continue indefinitely. Write operations must total 8 bytes. There are two primary modes of operation for the X76F400; Protected READ and protected WRITE. Protected operations must be performed with one of two 8byte passwords. The basic method of communication for the device is generating a start condition, then transmitting a command, followed by the correct password. All parts will be shipped from the factory with all passwords equal to `0.' The user must perform ACK polling to determine the validity of the password, prior to starting a data transfer (see Acknowledge Polling). Only after the correct password is accepted, and an ACK polling has been performed, can the data transfer occur. See Figure 1. To ensure the correct communication, RST must remain LOW under all conditions except when running a "response-to-reset sequence". Data is transferred in 8-bit segments, with each transfer being followed by an ACK, generated by the receiving device. If the X76F400 is in a nonvolatile write cycle a "no ACK" (SDA = High) response will be issued in response to loading of the command byte. If a stop is issued prior to the nonvolatile write cycle, the write operation will be terminated; the part will then reset and enter into a standby mode. (The basic sequence is illustrated in Figure 1.) PIN NAMES Symbol SDA SCL RST VCC VSS NC Description Serial Data Input/Output Serial Clock Input Reset Input Supply Voltage Ground No Connect PIN CONFIGURATION SOIC VSS NC SDA NC 1 2 3 4 TSSOP VCC NC NC VSS 1 2 3 4 8 7 6 5 RST SCL SDA NC 8 7 6 5 VCC RST SCL NC After each transaction is completed, the X76F400 will reset and enter into a standby mode. This will also be the response if an unsuccessful attempt is made to access a protected array. REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 2 of 14 X76F400 Figure 1. X76F400 Device Operation Load Command/Address Byte Clock and Data Conventions Data states on the SDA line can change only during SCL LOW. SDA changes during SCL HIGH are reserved for indicating start and stop conditions. Refer to Figures 2 and 3. Start Condition All commands are preceeded by the start condition, which is a HIGH to LOW transition of SDA when SCL is HIGH. The X76F400 continuously monitors the SDA and SCL lines for the start condition, and will not respond to any command until this condition is met. A start may be issued to terminate the input of a control byte or the input data to be written. This will reset the device and leave it ready to begin a new read or write command. Because of the push/pull output, a start cannot be generated while the part is outputting data. Starts are inhibited while a write is in progress. Stop Condition All communications must be terminated by a stop condition. The stop condition is a LOW to HIGH transition of SDA when SCL is HIGH. The stop condition is also used to reset the device during a command or data input sequence, leaving the device in the standby power mode. As with starts, stops are inhibited when outputting data and while a write is in progress. Acknowledge Acknowledge is a software convention used to indicate successful data transfer. The transmitting device, either master or slave, will release the bus after transmitting 8 bits. During the ninth clock cycle the receiver will pull the SDA line LOW to acknowledge that it received the 8 bits of data. The X76F400 will respond with an acknowledge after recognition of a start condition and its slave address. If both the device and a write condition have been selected, the X76F400 will respond with an acknowledge after the receipt of each subsequent 8-bit word. Load 8-Byte Password Verify Password Acceptance by Use of ACK Polling Read/Write Data Bytes Retry Counter The X76F400 contains a retry counter. The retry counter allows 8 accesses with an invalid password before any action is taken. The counter will increment with any combination of incorrect passwords. If the retry counter overflows, the memory area and both of the passwords are cleared to "0." If a correct password is received prior to retry counter overflow, the retry counter is reset and access is granted. Device Protocol The X76F400 supports a bi-directional bus oriented protocol. The protocol defines any device that sends data onto the bus as a transmitter and the receiving device as a receiver. The device controlling the transfer is a master and the device being controlled is the slave. The master will always initiate data transfers and provide the clock for both transmit and receive operations. Therefore, the X76F400 will be considered a slave in all applications. Figure 2. Data Validity SCL SDA Data Stable Data Change REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 3 of 14 X76F400 Figure 3. Definition of Start and Stop Conditions SCL SDA START Condition STOP Condition Table 1. X76F400 Instruction Set Command After Start 1 S5 S4 S3 S2 S1 S00 1 S5 S4 S3 S2 S1 S0 1 11111100 11111110 01010101 Command Description Sector Write Sector Read Change Write Password Change Read Password Password ACK Command Password Used Write Read Write Write None Illegal command codes will be disregarded. The part will respond with a "no-ACK" to the illegal byte and then return to the standby mode. All write/read operations require a password. PROGRAM OPERATIONS Sector Write The sector write mode requires issuing the 8-bit write command followed by the password and then the data bytes transferred as illustrated in Figure 4. The write command byte contains the address of the sector to be written. Data is written starting at the first address of a sector and 8 bytes must be transferred. After the last byte to be transferred is acknowledged, a stop condition is issued which starts the nonvolatile write cycle. If more or less than 8 bytes are transferred, the data in the sector remains unchanged. ACK Polling Once a stop condition is issued to indicate the end of the host's write sequence, the X76F400 initiates the internal nonvolatile write cycle. In order to take advantage of the typical 5ms write cycle, ACK polling can begin immediately. This involves issuing the start condition followed by the new command code of 8 bits (first byte of the protocol). If the X76F400 is still busy with the nonvolatile write operation, it will issue a "noACK" in response. If the nonvolatile write operation is completed, an "ACK" will be returned and the host can then proceed with the rest of the protocol. Data ACK Polling Sequence Write Sequence Completed Enter ACK Polling Issue START Issue New Command Code ACK Returned? YES PROCEED NO REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 4 of 14 X76F400 After the password sequence, there is always a nonvolatile write cycle. This is done to discourage random guesses of the password if the device is being tampered with. In order to continue the transaction, the X76F400 requires the master to perform a password ACK polling sequence with the specific command code of 55h. As with regular acknowledge polling the user can either time out for 10ms and then issue the ACK polling once, or continuously loop as described in the flow. If the password inserted is correct, the nonvolatile cycle in response to the password ACK polling sequence is over, and an "ACK" is returned. If the password inserted is incorrect, a "no ACK" is returned, even if the nonvolatile cycle is over. Therefore, the user cannot be certain that the password is incorrect until the 10ms write cycle time has elapsed. Password ACK Polling Sequence Password Load Completed Enter ACK Polling READ OPERATIONS Read operations are initiated in the same manner as write operations but with a different command code. Sector Read With sector read, a sector address is supplied with the read command. Once the password has been acknowledged data may be read from the sector. An acknowledge must follow each 8-bit data transfer. A read operation always begins at the first byte in the sector, but may stop at any time. Random accesses to the array are not possible. Continuous reading from the array will return data from successive sectors. After reading the last sector in the array, the address is automatically set to the first sector in the array and data can continue to be read out. After the last bit has been read, a stop condition is generated without sending a preceding acknowledge. Issue START Issue Password ACK Command ACK Returned? NO YES PROCEED REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 5 of 14 X76F400 Figure 4. Sector Write Sequence (Password Required) Host Commands X76F400 Response START Write Command Write Password 7 Write Password 0 SDA S ACK ACK ACK ACK STOP P ACK ACK ACK ACK 8th CLK Wait tWC OR Password ACK Command If ACK, then Password Matches ACK Password ACK Command ACK Host Commands START S X76F400 Response No-ACK Wait tWC Data ACK Polling Figure 5. Acknowledge Polling SCL 8th CLK of 8th Pwd. Byte `ACK' CLK `ACK' CLK SDA `ACK' START Condition 8th Bit ACK or No ACK Figure 6. Sector Read Sequence (Password Required) Host Commands X76F400 Response START Read Command Read Password 7 Read Password 0 SDA S ACK ACK ACK ACK Data n STOP P ACK Data 0 Wait tWC OR Password ACK Command If ACK, then Password Matches ACK Password ACK Command ACK Host Commands START S X76F400 Response No-ACK REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 6 of 14 X76F400 PASSWORDS Passwords are changed by sending the "change read password" or "change write password" commands in a normal sector write operation. A full 8 bytes containing the new password must be sent, following successful transmission of the current write password and a valid password ACK response. The user can use a repeated ACK polling command to check that a new password has been written correctly. An ACK indicates that the new password is valid. There is no way to read any of the passwords. RESPONSE-TO-RESET (DEFAULT = 19 40 AA 55) The ISO Response-to-reset is controlled by the RST and CLK pins. When RST is pulsed high during a clock pulse, the device will output 32 bits of data, one bit per clock, and it resets to the standby state. This conforms to the ISO standard for "synchronous response to reset." The part must not be in a write cycle for the response-to-reset to occur. After initiating a nonvolatile write cycle, the RST pin must not be pulsed until the nonvolatile write cycle is complete. If not, the ISO response will not be activated. If the RST is pulsed HIGH and the CLK is within the RST pulse (meet the tNOL spec.) in the middle of an ISO transaction, it will output the 32 bit sequence again (starting at bit 0). Otherwise, this aborts the ISO operation and the part returns to standby state. If the RST is pulsed HIGH and the CLK is outside the RST pulse (in the middle of an ISO transaction), this aborts the ISO operation and the part returns to standby state. If power is interrupted during the response-to-reset, the response-to-reset will be aborted and the part will return to the standby state. A response-to-reset is not available during a nonvolatile write cycle. Figure 7. Response to RESET (RST) RST SCK SO 10011000 LSB Byte 0 0 00000 10 01010101 10101010 MSB 3 MSB LSB 1 MSB LSB 2 MSB LSB REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 7 of 14 X76F400 ABSOLUTE MAXIMUM RATINGS Temperature under bias ....................-65C to +135C Storage temperature ........................-65C to +150C Voltage on any pin with respect to VSS ......................................... -1V to +7V D.C. output current ............................................... 5mA Lead temperature (soldering, 10 seconds).........300C COMMENT Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only; functional operation of the device (at these or any other conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING CONDITIONS Temperature Commercial Industrial Min. 0C -40C Max. +70C +85C Supply Voltage X76F400 X76F400 - 2.5 Limits 4.5V to 5.5V 2.5V to 5.5V D.C. OPERATING CHARACTERISTICS (Over the recommended operating conditions unless otherwise specified.) Limits Symbol ICC1 Parameter VCC Supply current (Read) VCC Supply current (Write) VCC Supply current (Standby) VCC Supply current (Standby) Input leakage current Output leakage current Input LOW voltage Input HIGH voltage Output LOW voltage Min. Max. 1 Unit mA Test Conditions fSCL = VCC x 0.1/VCC x 0.9 Levels @ 400 kHz, SDA = Open RST = VSS fSCL = VCC x 0.1/VCC x 0.9 Levels @ 400 kHz, SDA = Open RST = VSS VIL = VCC x 0.1, VIH = VCC x 0.9 fSCL = 400 kHz, fSDA = 400 kHz VSDA = VSCC = VCC Other = GND or VCC-0.3V VIN = VSS to VCC VOUT = VSS to VCC ICC2(3) 3 mA ISB1(1) ISB2(1) ILI ILO VIL (2) (2) 1 1 10 10 -0.5 VCC x 0.1 0.4 VCC x 0.9 VCC + 0.5 A A A A V V V VIH VOL IOL = 3mA CAPACITANCE TA = +25C, f = 1MHz, VCC = 5V Symbol COUT(3) CIN(3) Test Output capacitance (SDA) Input capacitance (RST, SCL) Max. 8 6 Unit pF pF Conditions VI/O = 0V VIN = 0V Notes: (1) Must perform a stop command after a read command prior to measurement (2) VIL min. and VIH max. are for reference only and are not tested (3) This parameter is periodically sampled and not 100% test REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 8 of 14 X76F400 EQUIVALENT A.C. LOAD CIRCUIT 5V 1.53K Output 100pF Output 100pF 3V 1.3K A.C. TEST CONDITIONS Input pulse levels Input rise and fall times Input and output timing level Output load VCC x 0.1 to VCC x 0.9 10ns VCC x 0.5 100pF AC CHARACTERISTICS (TA = -40C to +85C, VCC = +2.5V to +5.5V, unless otherwise specified) Symbol fSCL tAA(2) tBUF tHD:STA tLOW tHIGH tSU:STA tHD:DAT tSU:DAT tR tF tSU:STO tDH tNOL tRDV tCDV tRST tSU:RST SCL clock frequency SCL LOW to SDA data out valid Time the Bus must be free before a new transmission can start Start condition hold time Clock LOW period Clock HIGH period Start condition setup time (for a repeated start condition) Data in hold time Data in setup time SDA and SCL rise time SDA and SCL fall time Stop condition setup time Data out hold time RST to SCL non-overlap RST LOW to SDA valid during response to reset CLK LOW to SDA valid during response to reset RST high time RST setup time Parameter Min. 0 0.1 1.2 0.6 1.2 0.6 0.6 10 100 20+0.1XCb 20+0.1XCb 0.6 0 500 0 0 1.5 500 (1) (1) Max. 1 0.9 Unit MHz s s s s s s ns ns 300 300 ns ns s s ns 450 450 ns ns s ns Notes: (1) Cb = total capacitance of one bus line in pF (2) tAA = 1.1s Max below VCC = 2.5V. RESET AC SPECIFICATIONS Power Up Timing Symbol tPUR (1) Parameter Time from power up to read Time from power up to write Min. Typ.(2) Max. 1 5 Unit ms ms tPUW(1) Notes: (1) Delays are measured from the time VCC is stable until the specified operation can be initiated. These parameters are periodically sampled and not 100% tested. (2) Typical values are for TA = 25C and VCC = 5.0V REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 9 of 14 X76F400 Nonvolatile Write Cycle Timing Symbol tWC Note: (1) Parameter Write cycle time Min. Typ.(1) 5 Max. 10 Unit ms (1) tWC is the time from a valid stop condition at the end of a write sequence to the end of the self-timed internal nonvolatile write cycle. It is the minimum cycle time to be allowed for any nonvolatile write by the user, unless Acknowledge Polling is used. Bus Timing tF SCL tSU:STA SDA IN tAA SDA OUT tDH tBUF tHD:STA tHD:DAT tSU:DAT tSU:STO tHIGH tLOW tR Write Cycle Timing SCL SDA 8th Bit of Last Byte ACK tWC STOP Condition START Condition RST Timing Diagram--Response to a Synchronous Reset RST tRST tNOL tNOL 1 CLK Pulse st tHIGH_RST 2 CLK Pulse nd CLK tRDV I/O tSU:RST tCDV Data Bit (1) tLOW_RST 3 CLK Pulse rd Data Bit (2) REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 10 of 14 X76F400 GUIDELINES FOR CALCULATING TYPICAL VALUES OF BUS PULL UP RESISTORS Pull Up Resistance in K 100 80 60 40 20 R RMIN 20 40 60 80 100 MAX RMAX R MIN V CCMAX = ------------------------- = 1.8K I OLMIN t R = ----------------C BUS Bus Capacitance in pF tR = maximum allowable SDA rise time REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 11 of 14 X76F400 PACKAGING INFORMATION 8-Lead Plastic Small Outline Gull Wing Package Type S 0.150 (3.80) 0.228 (5.80) 0.158 (4.00) 0.244 (6.20) Pin 1 Index Pin 1 0.014 (0.35) 0.019 (0.49) 0.188 (4.78) 0.197 (5.00) (4X) 7 0.053 (1.35) 0.069 (1.75) 0.004 (0.19) 0.010 (0.25) 0.050 (1.27) 0.010 (0.25) X 45 0.020 (0.50) 0.050" Typical 0 - 8 0.0075 (0.19) 0.010 (0.25) 0.016 (0.410) 0.037 (0.937) 0.250" 0.050" Typical FOOTPRINT 0.030" Typical 8 Places NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 12 of 14 X76F400 PACKAGING INFORMATION 8-Lead Plastic, TSSOP, Package Type V .025 (.65) BSC .169 (4.3) .252 (6.4) BSC .177 (4.5) .114 (2.9) .122 (3.1) .047 (1.20) .0075 (.19) .0118 (.30) .002 (.05) .006 (.15) .010 (.25) Gage Plane 0 - 8 .019 (.50) .029 (.75) Detail A (20X) (1.78) .031 (.80) .041 (1.05) See Detail "A" (0.42) (0.65) All Measurements Are Typical Seating Plane (4.16) (7.72) NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 13 of 14 X76F400 Ordering Information X76F400 Device X X -X VCC Limits Blank = 5V 10% 2.5 = 2.5V to 5.5V Temperature Range Blank = Commercial = 0C to +70C I = Industrial= -40C to +85C Package S8 = 8-Lead SOIC V8 = 8-Lead TSSOP H = Die in waffle packs (Contact Factory) W = Die in wafer form (Contact Factory) Part Mark Convention 8-Lead SOIC X76F400 X XX Blank = 8-Lead SOIC 8-Lead TSSOP YWW 7640XX Blank = 4.5 to 5.5V, 0 to 70C I = 4.5 to 5.5V, -40 to +85C AE = 2.5 to 5.5V, 0 to 70C AF = 2.5 to 5.5V, -40 to +85C AE = 2.5 to 5.5V, 0 to +70C AF = 2.5 to 5.5V, -40 to +85C Blank = 4.5 to 5.5V, 0 to +70C I = 4.5 to 5.5V, -40 to +85C LIMITED WARRANTY (c)Xicor, Inc. 2000 Patents Pending Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Xicor, Inc. makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Xicor, Inc. makes no warranty of merchantability or fitness for any purpose. Xicor, Inc. reserves the right to discontinue production and change specifications and prices at any time and without notice. Xicor, Inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xicor, Inc. product. No other circuits, patents, or licenses are implied. TRADEMARK DISCLAIMER: Xicor and the Xicor logo are registered trademarks of Xicor, Inc. AutoStore, Direct Write, Block Lock, SerialFlash, MPS, and XDCP are also trademarks of Xicor, Inc. All others belong to their respective owners. U.S. PATENTS Xicor products are covered by one or more of the following U.S. Patents: 4,326,134; 4,393,481; 4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846; 4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829,482; 4,874,967; 4,883,976; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084,667; 5,153,880; 5,153,691; 5,161,137; 5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. Foreign patents and additional patents pending. LIFE RELATED POLICY In situations where semiconductor component failure may endanger life, system designers using this product should design the system with appropriate error detection and correction, redundancy and back-up features to prevent such an occurrence. Xicor's products are not authorized for use in critical components in life support devices or systems. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. REV 1.0 7/5/00 www.xicor.com Characteristics subject to change without notice. 14 of 14 |
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