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X76F100
Secure SerialFlash
128 x 8 Bit
FEATURES * 64-bit password security * One array (112-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 --3.0 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 PDIP, SOIC, MSOP, and smart car module
DESCRIPTION The X76F100 is a Password Access Security Supervisor, containing one 896-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 X76F100 features a serial interface and software protocol allowing operation on a popular two wire bus. The bus signals are a clock Input (SCL) and a bidirectional data input and output (SDA). Access to the device is controlled through a chip select (CS) input, allowing any number of devices to share the same bus. The X76F100 also features a synchronous response to reset providing an automatic output of a hard-wired 32-bit data stream conforming to the industry standard for memory cards. The X76F100 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
CS SCL SDA Chip Enable Data Transfer Array Access Enable Interface Logic Password Array and Password Verification Logic RST Reset Response Register Retry Counter 8K Byte SerialFlash Array Array 0 (Password Protected)
32 Byte SerialFlash Array Array 1 (Password Protected)
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X76F100
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. Chip Select (CS) When CS is high, the X76F100 is deselected and the SDA pin is at high impedance and unless an internal write operation is underway, the X76F100 will be in standby mode. CS low enables the X76F100, placing it in the active mode. Reset (RST) RST is a device reset pin. When RST is pulsed high while CS is low the X76F100 will output 32 bits of fixed data which conforms to the standard for "synchronous response to reset". CS must remain LOW and the part must not be in a write cycle for the response to reset to occur. See Figure 7. If at any time during the response to reset CS goes HIGH, the response to reset will be aborted and the part will return to the standby state. The response to reset is "mask programmable" only! DEVICE OPERATION The X76F100 memory array consists of fourteen 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 X76F100; 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 established by first enabling the device (CS LOW), 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, before starting a data transfer (see Acknowledge Polling.) Only after the correct password is accepted and a ACK polling has been performed, can the data transfer occur.
REV 1.0 6/22/00 VCC NC NC VSS 1 2 3 4 SOIC VSS CS SDA NC 1 2 3 4 MSOP VSS NC CS SDA 1 2 3 4 8 7 6 5 VCC NC RST SCL 8 7 6 5 VCC RST SCL NC VCC RST SCL NC GND CS SDA NC
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 X76F100 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 and the part will reset and enter into a standby mode. The basic sequence is illustrated in Figure 1. PIN NAMES Symbol
CS SDA SCL RST VCC VSS NC
Description
Chip Select Input Serial Data Input/Output Serial Clock Input Reset Input Supply Voltage Ground No Connect
PIN CONFIGURATION
PDIP 8 7 6 5 RST SCL SDA CS Smart Card
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X76F100
After each transaction is completed, the X76F100 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. Figure 1. X76F100 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 Figure 2 and Figure 3. Start Condition All commands are preceded by the start condition, which is a HIGH to LOW transition of SDA when SCL is HIGH. The X76F100 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 and will leave 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 eight bits. During the ninth clock cycle the receiver will pull the SDA line LOW to acknowledge that it received the eight bits of data. The X76F100 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 X76F100 will respond with an acknowledge after the receipt of each subsequent eight-bit word.
Load 8-Byte Password
Verify Password Acceptance by Use of Ack Polling
Read/Write Data Bytes
Retry Counter The X76F100 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 X76F100 supports a bidirectional 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 X76F100 will be considered a slave in all applications.
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X76F100
Figure 2. Data Validity
SCL
SDA Data Stable Data Change
Figure 3. Definition of Start and Stop Conditions
SCL
SDA
Start Condition
Stop Condition
Table 1. X76F100 Instruction Set Command after Start
1 0 0 S3 S2 S1 S00 1 0 0 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 eight 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.
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ACK Polling Once a stop condition is issued to indicate the end of the host's write sequence, the X76F100 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 (1st byte of the protocol.) If the X76F100 is still busy with the nonvolatile write operation, it will issue a "no-ACK" in response. If the nonvolatile write operation has completed, an "ACK" will be returned and the host can then proceed with the rest of the protocol.
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X76F100
Data ACK Polling Sequence
Write Sequence Completed Enter ACK Polling
Password ACK Polling Sequence
Password Load Completed Enter ACK Polling
Issue START
Issue START
Issue New Command Code
Issue Password ACK Command
ACK returned?
NO
ACK returned?
NO
YES PROCEED
YES PROCEED
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 X76F100 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 that was inserted was correct, then an "ACK" will be returned once the nonvolatile cycle in response to the password ACK polling sequence is over. If the password that was inserted was incorrect, then a "no ACK" will be 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.
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.
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X76F100
Figure 4. Sector Write Sequence (Password Required)
Host Commands X76F100 Response START Write Command Write Password 7 Write Password 0
SDA S ACK ACK ACK ACK STOP P ACK ACK ACK ACK
Wait tWC OR Password ACK Command
If ACK, Then Password Matches ACK Password ACK Command ACK Host Commands START
S X76F100 Responce No-ACK
Wait tWC Data ACK Polling
Figure 5. Acknowledge Polling
SCL 8th CLK of 8th Pwd. Byte `ACK' CLK 8th CLK `ACK' CLK
SDA
`ACK' Start Condition
8th Bit ACK or no ACK
Figure 6. Sector Read Sequence (Password Required)
Host Commands X76F100 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 X76F100 Response No-ACK
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X76F100
PASSWORDS Passwords are changed by sending the "change read password" or "change write password" commands in a normal sector write operation. A full eight 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 00 AA 55) The ISO Response to reset is controlled by the RST, CS and CLK pins. When RST is pulsed high, while CS is low, the device will output 32-bits of data, one bit per clock. This conforms to the ISO standard for "synchronous response to reset". CS must remain LOW and 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. Also, any attempt to pulse the RST pin in the middle of an ISO transaction will stop the transaction with the SDA pin in high impedance. The user will have to issue a stop condition and start the transaction again. If at any time during the Response to Reset CS goes HIGH, 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. Continued clocks after the 32-bits, will output the 32-bit sequence again, starting at byte 0.
Figure 7. Response to RESET(RST)
CS RST
SCK
SO
10011000 LSB Byte 0
0 00000 00
01010101
10101010 MSB 3
MSB LSB 1
MSB LSB 2
MSB LSB
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X76F100
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
X76F100 X76F100-3
Limits
4.5V to 5.5V 3.0V 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 = CS = VSS fSCL = VCC x 0.1/VCC x 0.9 Levels @ 400 kHz, SDA = Open RST = CS = 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 0.3 0.4 VCC x 0.7 VCC + 0.5
A A A A V V V
VIH
VOL
IOL = 3mA
CAPACITANCE TA = +25C, f = 1MHz, VCC = 5V Symbol
COUT CIN
(3) (3)
Test
Output Capacitance (SDA) Input Capacitance (RST, SCL, CS)
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% tested.
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X76F100
AC CHARACTERISTICS (TA = -40C to +85C, VCC = +3.0V to +5.5V, unless otherwise specified.) Symbol
fSCL tAA
(3)
Parameter
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 Device Deselect to SDA high impedance Device Select to RST active RST High Time RST Setup Time CS Setup Time CS Hold Time
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 0 0 1.5 500 200 100
(2) (2)
Max.
1 0.9
Unit
MHz s s s s s s ns ns
tBUF tHD:STA tLOW tHIGH tSU:STA tHD:DAT tSU:DAT tR tF tSU:STO tDH tNOL tRDV tCDV tDHZ(1) tSR
(1)
300 300
ns ns s s ns
450 450 450
ns ns ns ns s ns ns ns
tRST tSU:RST tSU:CS tSU:CS
Notes: (1) These Specs are not defined in the ISO 7816-3 Standard, since CS is not defined. (2) Cb = total capacitance of one bus line in pF (3) tAA = 1.1s Max below VCC = 3.0V.
RESET AC SPECIFICATIONS Power Up Timing Symbol
tPUR
(1) (1)
Parameter
Time from Power Up to Read Time from Power Up to Write
Min.
Typ.(2)
Max.
1 5
Unit
ms ms
tPUW
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
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X76F100
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
CS Timing Diagram (Selecting/Deselecting the Part)
SCL tSU:CS CS from Master tHD:CS
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X76F100
RST Timing Diagram--Response to a Synchronous Reset
tSR CS
RST tNOL CLK
tRST tNOL
1st CLK Pulse
tHIGH_RST
2nd CLK Pulse
tRDV I/O
tSU:RST
tCDV Data Bit (1)
tLOW_RST Data Bit (2)
3rd CLK Pulse
CS
RST
CLK tDHZ I/O Data Bit (N) Data Bit (N+1) (N+2)
GUIDELINES FOR CALCULATING TYPICAL VALUES OF BUS PULL UP RESISTORS
Pull Up Resistance in K
100 80 60 40 20 RMIN 20 40 60 80 100 RMAX
V CCMAX R MIN = ------------------------- = 1.8K I OLMIN
tR R MAX = ----------------C BUS
tR = maximum allowable SDA rise time
Bus Capacitance in pF
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X76F100
PACKAGING INFORMATION 8-Lead Miniature Small Outline Gull Wing Package Type M
0.118 0.002 (3.00 0.05) 0.012 + 0.006 / -0.002 (0.30 + 0.15 / -0.05) 0.0256 (0.65) Typ.
R 0.014 (0.36) 0.118 0.002 (3.00 0.05)
0.030 (0.76) 0.0216 (0.55)
0.036 (0.91) 0.032 (0.81)
7 Typ.
0.040 0.002 (1.02 0.05)
0.008 (0.20) 0.004 (0.10)
0.0256" Typical
0.007 (0.18) 0.005 (0.13)
0.150 (3.81) Ref. 0.193 (4.90) Ref.
0.025" Typical 0.220"
FOOTPRINT
0.020" Typical 8 Places
NOTE: 1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS)
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X76F100
PACKAGING INFORMATION 8-Lead Plastic Dual In-Line Package Type P
0.430 (10.92) 0.360 (9.14)
0.260 (6.60) 0.240 (6.10) Pin 1 Index Pin 1 0.300 (7.62) Ref. 0.060 (1.52) 0.020 (0.51)
Half Shoulder Width On All End Pins Optional Seating Plane 0.150 (3.81) 0.125 (3.18)
0.145 (3.68) 0.128 (3.25) 0.025 (0.64) 0.015 (0.38) 0.065 (1.65) 0.045 (1.14) 0.020 (0.51) 0.016 (0.41)
0.110 (2.79) 0.090 (2.29)
.073 (1.84) Max.
0.325 (8.25) 0.300 (7.62)
Typ. 0.010 (0.25)
0 15
NOTE: 1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH
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X76F100
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)
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X76F100
PACKAGING INFORMATION 8 Pad Chip on Board Smart Card Module Type X
0.465 0.002 (11.81 0.05) 0.088 (2.24) Min Epoxy Free Area (Typ.) 0.285 (7.24) Max. See Note 7 Sht. 2 R. 0.078 (2.00) 0.069 (1.75) Min Epoxy Free Area (Typ.)
0.270 (6.86) Max. See Note 7 Sht. 2 0.420 0.002 (10.67 0.05) A A 0.008 0.001 (0.20 0.03) 0.210 0.002 (5.33 0.05)
0.233 0.002 (5.92 0.05) SECTION A-A FR4 Tape Die Glob Size 0.0235 (0.60) Max. 0.015 (0.38) Max. 0.008 (0.20) Max.
See Detail Sheet 3 0.146 0.002 (3.71 0.05)
Copper, Nickel Plated, Gold Flash 0.174 0.002 (4.42 0.05)
R. 0.013 (0.33) (8x)
VCC
0.105 0.002 (2.67 0.05) Typ.
VSS
RST
CS
(8x)
SCL
SDA
0.105 0.002 (8x) (2.67 0.05)
NC
NC
NOTE: ALL DIMENSIONS IN INCHES AND (MILLIMETERS) REV 1.0 6/22/00
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X76F100
Ordering Information X76F100 Device X X -X VCC Limits Blank = 5V 10% 3.0 = 3.0V to 5.5V Temperature Range Blank = Commercial = 0C to +70C I = Industrial= -40C to +85C Package S8 = 8-Lead SOIC M8 = 8-Lead MSOP P = 8-Lead PDIP H = Die in Waffle Packs W = Die in Wafer Form X = Smart Card Module Part Mark Convention 8-Lead MSOP EYWW XXX AAQ = 3.0 to 5.5V, 0 to +70C AAR = 3.0 to 5.5V, -40 to +85C AAS = 4.5 to 5.5V, 0 to +70C AAT = 4.5 to 5.5V, -40 to +85C 8-Lead SOIC/PDIP X76F100 X XX Blank = 8-Lead SOIC
D = 3.0 to 5.5V, 0 to +70C E = 3.0 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.
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