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06/01/04
RELIABILITY REPORT FOR
DS21Q58, Rev B1
Dallas Semiconductor
4401 South Beltwood Parkway Dallas, TX 75244-3292
Prepared by: Don Lipps Staff Reliability Engineer Dallas Semiconductor 4401 South Beltwood Pkwy. Dallas, TX 75244-3292 Email : don.lipps@dalsemi.com ph: 972-371-3739 fax: 972-371-6016
Conclusion: The following qualification successfully meets the quality and reliability standards required of all Dallas Semiconductor products and processes: DS21Q58, Rev B1 In addition, Dallas Semiconductor's continuous reliability monitor program ensures that all outgoing product will continue to meet Maxim's quality and reliability standards. The current status of the reliability monitor program can be viewed at http://www.maxim-ic.com/TechSupport /dsreliability.html. Device Description: A description of this device can be found in the product data sheet. You can find the product data sheet at http://dbserv.maxim-ic.com/l_datasheet3.cfm. Reliability Derating: The Arrhenius model will be used to determine the acceleration factor for failure mechanisms that are temperature accelerated. AfT = exp((Ea/k)*(1/Tu - 1/Ts)) = tu/ts AfT = Acceleration factor due to Temperature tu = Time at use temperature (e.g. 55C) ts = Time at stress temperature (e.g. 125C) k = Boltzmann's Constant (8.617 x 10-5 eV/K) Tu = Temperature at Use (K) Ts = Temperature at Stress (K) Ea = Activation Energy (e.g. 0.7 ev) The activation energy of the failure mechanism is derived from either internal studies or industry accepted standards, or activation energy of 0.7ev will be used whenever actual failure mechanisms or their activation energies are unknown. All deratings will be done from the stress ambient temperature to the use ambient temperature. An exponential model will be used to determine the acceleration factor for failure mechanisms, which are voltage accelerated. AfV = exp(B*(Vs - Vu)) AfV = Acceleration factor due to Voltage Vs = Stress Voltage (e.g. 7.0 volts) Vu = Maximum Operating Voltage (e.g. 5.5 volts) B = Constant related to failure mechanism type (e.g. 1.0, 2.4, 2.7, etc.) The Constant, B, related to the failure mechanism is derived from either internal studies or industry accepted standards, or a B of 1.0 will be used whenever actual failure mechanisms or their B are unknown. All deratings will be done from the stress voltage to the maximum operating voltage. Failure rate data from the operating life test is reported using a Chi-Squared statistical model at the 60% or 90% confidence level (Cf).
The failure rate, Fr, is related to the acceleration during life test by: Fr = X/(ts * AfV * AfT * N * 2) X = Chi-Sq statistical upper limit N = Life test sample size
Failure Rates are reported in FITs (Failures in Time) or MTTF (Mean Time To Failure). The FIT rate is related to MTTF by: MTTF = 1/Fr NOTE: MTTF is frequently used interchangeably with MTBF. The calculated failure rate for this device/process is: FAILURE RATE: MTTF (YRS): 34521 FITS: 3.3
The parameters used to calculate this failure rate are as follows: Cf: 60% Ea: 0.7 B: 0 Tu: 25
C
Vu: 5.5
Volts
The reliability data follows. A the start of this data is the device information. The next section is the detailed reliability data for each stress. The reliability data section includes the latest data available. Device Information: Process: Passivation: Die Size: Number of Transistors: Interconnect: Gate Oxide Thickness: E6H-2P2M,HPVt,TCZ ALOCOS:GOI Passivation w/OxyNitride-Nov. 4% PSG 416 x 405 1 Aluminum / 1% Silicon / 0.5% Copper 150 A
ELECTRICAL CHARACTERIZATION
DESCRIPTION ESD SENSITIVITY ESD SENSITIVITY ESD SENSITIVITY ESD SENSITIVITY ESD SENSITIVITY LATCH-UP LATCH-UP DATE CODE CONDITION 0418 0418 0418 0418 0418 0418 0418 EOS/ESD S5.1 HBM 500 VOLTS EOS/ESD S5.1 HBM 1000 VOLTS EOS/ESD S5.1 HBM 2000 VOLTS EOS/ESD S5.1 HBM 4000 VOLTS EOS/ESD S5.1 HBM 8000 VOLTS JESD78, I-TEST 125C JESD78, Vsupply TEST 125C Total: READPOINT QUANTITY 1 1 1 1 1 PUL'S PUL'S PUL'S PUL'S PUL'S 3 3 3 3 3 6 6 FAILS 0 0 0 3 3 0 0 6
OPERATING LIFE
DESCRIPTION HIGH VOLTAGE LIFE HIGH TEMP OP LIFE HIGH TEMP OP LIFE HIGH TEMP OP LIFE HIGH TEMP OP LIFE DATE CODE CONDITION 0310 0332 0336 0402 0418 125C, 6.0 VOLTS 125C, 5.25 VOLTS 125C, 5.25 VOLTS 125C, 3.5 VOLTS 125C, 5.0 VOLTS READPOINT QUANTITY 1000 HRS 1000 HRS 1000 HRS 1000 HRS 192 HRS Total: 80 77 77 45 77 FAILS 0 0 0 0 0 0
FAILURE RATE:
MTTF (YRS): 34521
FITS:
3.3

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