MAX6656

MAX6656
MAX6656MEE
Rev. A
RELIABILITY REPORT
FOR
MAX6656MEE
PLASTIC ENCAPSULATED DEVICES
February 3, 2004
MAXIM INTEGRATED PRODUCTS
120 SAN GABRIEL DR.
SUNNYVALE, CA 94086
Written by
Reviewed by
Jim Pedicord
Quality Assurance
Reliability Lab Manager
Bryan J. Preeshl
Quality Assurance
Executive Director
Conclusion
The MAX6656 successfully meets the quality and reliability standards required of all Maxim products. In addition,
Maxim’s continuous reliability monitoring program ensures that all outgoing product will continue to meet Maxim’s quality
and reliability standards.
Table of Contents
I. ........Device Description
II. ........Manufacturing Information
III. .......Packaging Information
IV. .......Die Information
V. ........Quality Assurance Information
VI. .......Reliability Evaluation
......Attachments
I. Device Description
A. General
The MAX6656 is a precise voltage and temperature monitor. The digital thermometer reports the temperature of two
remote sensors and its own die temperature. The remote sensors are diode-connected transistors—typically a lowcost, easily mounted 2N3906 PNP type—that replace conventional thermistors or thermocouples. Remote accuracy
is ±1°C for multiple transistor manufacturers with no calibration necessary. The remote channels can also measure
the die temperature of other ICs, such as microprocessors, that contain a substrate-connected PNP with its
collector grounded and its base and emitter available for temperature-sensing purposes. The temperature is digitized
with 11-bit resolution.
The MAX6656 also measure it’s own supply voltage and three external voltages with 8-bit resolution. Each voltage
input's sensitivity is set to give approximately 3/4-scale output code when the input voltage is at its nominal value.
The MAX6656 operates on a +3.3V supply and its second voltage monitor is 5V.
The 2-wire serial interface accepts standard SMBus™ Write Byte, Read Byte, Send Byte, and Receive Byte
commands to program the alarm thresholds and to read data. The MAX6656 also provide SMBus alert response and
timeout functions. The MAX6656 measures automatically and autonomously, with the conversion rate
programmable. The adjustable rate allows the user to control the supply current.
In addition to the SMBus ALERT -bar output, the MAX6656 features an OVERT -bar output, which is used as a
temperature reset that remains active only while the temperature is above the maximum temperature limit. The
OVERT-bar output is optimal for fan control or for system shutdown.
B. Absolute Maximum Ratings
Item
VCC to GND
DXN_ to GND
SMBCLK, SMBDATA, ALERT, STBY, OVERT to GND
VIN1 to GND
VIN2 to GND
VIN3 to GND
All Other Pins to GND
SMBDATA, ALERT, OVERT Current
DXN_ Current
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Lead Temperature (soldering, 10s)
Continuous Power Dissipation (+70°C)
16-Pin QSOP
Derates above +70°C
16-Pin QSOP
Rating
-0.3V to +6V
-0.3V to +0.8V
-0.3V to +6V
-0.3V to +16V
-0.3V to +6V
-0.3V to +6V
-0.3V to (VCC + 0.3V)
-1mA to +50mA
±1mA
-55°C to +125°C
+150°C
-65°C to +150°C
+300°C
667mW
8.3mW/°C
II. Manufacturing Information
A. Description/Function: Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors
B. Process:
B8 (Standard 0.8 micron silicon gate CMOS)
C. Number of Device Transistors:
26,783
D. Fabrication Location:
California, USA
E. Assembly Location:
Thailand or Philippines
F. Date of Initial Production:
July, 2001
III. Packaging Information
A. Package Type:
16-Lead QSOP
B. Lead Frame:
Copper
C. Lead Finish:
Solder Plate
D. Die Attach:
Silver-Filled Epoxy
E. Bondwire:
Gold (1 mil dia.)
F. Mold Material:
Epoxy with silica filler
G. Assembly Diagram:
Buildsheet # 05-2901-0011
H. Flammability Rating:
Class UL94-V0
I. Classification of Moisture Sensitivity
per JEDEC standard JESD22-A112:
Level 1
IV. Die Information
A. Dimensions:
86 x 144 mils
B. Passivation:
Si3N4/SiO2 (Silicon nitride/ Silicon dioxide)
C. Interconnect:
Aluminum/Copper/Si
D. Backside Metallization:
None
E. Minimum Metal Width:
.8 microns (as drawn)
F. Minimum Metal Spacing:
.8 microns (as drawn)
G. Bondpad Dimensions:
5 mil. Sq.
H. Isolation Dielectric:
SiO2
I. Die Separation Method:
Wafer Saw
V. Quality Assurance Information
A. Quality Assurance Contacts: Jim Pedicord
(Manager, Reliability Operations)
Bryan Preeshl
(Executive Director of QA)
Kenneth Huening (Vice President)
B. Outgoing Inspection Level:
0.1% for all electrical parameters guaranteed by the Datasheet.
0.1% For all Visual Defects.
C. Observed Outgoing Defect Rate: < 50 ppm
D. Sampling Plan: Mil-Std-105D
VI. Reliability Evaluation
A. Accelerated Life Test
The results of the 135°C biased (static) life test are shown in Table 1. Using these results, the Failure
Rate (λ) is calculated as follows:
λ=
1
=
MTTF
1.83
(Chi square value for MTTF upper limit)
192 x 4389 x 239 x 2
Temperature Acceleration factor assuming an activation energy of 0.8eV
λ = 4.54 x 10-9
λ = 4.54 F.I.T. (60% confidence level @ 25°C)
This low failure rate represents data collected from Maxim’s reliability qualification and monitor programs.
Maxim also performs weekly Burn-In on samples from production to assure reliability of its processes. The
reliability required for lots which receive a burn-in qualification is 59 F.I.T. at a 60% confidence level, which equates
to 3 failures in an 80 piece sample. Maxim performs failure analysis on rejects from lots exceeding this level. The
attached Burn-In Schematic (Spec. # 06-5744) shows the static circuit used for this test. Maxim also performs
1000 hour life test monitors quarterly for each process. This data is published in the Product Reliability Report (RR1M).
B. Moisture Resistance Tests
Maxim evaluates pressure pot stress from every assembly process during qualification of each new design.
Pressure Pot testing must pass a 20% LTPD for acceptance. Additionally, industry standard 85°C/85%RH or
HAST tests are performed quarterly per device/package family.
C. E.S.D. and Latch-Up Testing
The TS06-1 die type has been found to have all pins able to withstand a transient pulse of ±1500V, per MilStd-883 Method 3015 (reference attached ESD Test Circuit). Latch-Up testing has shown that this device
withstands a current of ±250mA.
Table 1
Reliability Evaluation Test Results
MAX6656MEE
TEST ITEM
TEST CONDITION
Static Life Test (Note 1)
Ta = 135°C
Biased
Time = 192 hrs.
FAILURE
IDENTIFICATION
SAMPLE
SIZE
NUMBER OF
FAILURES
DC Parameters
& functionality
239
0
Moisture Testing (Note 2)
Pressure Pot
Ta = 121°C
P = 15 psi.
RH= 100%
Time = 168hrs.
DC Parameters
& functionality
100
0
85/85
Ta = 85°C
RH = 85%
Biased
Time = 1000hrs.
DC Parameters
& functionality
77
0
DC Parameters
77
Mechanical Stress (Note 2)
Temperature
Cycle
-65°C/150°C
1000 Cycles
Method 1010
Note 1: Life Test Data may represent plastic DIP qualification lots.
Note 2: Generic package/process data.
0
Attachment #1
TABLE II. Pin combination to be tested. 1/ 2/
Terminal A
(Each pin individually
connected to terminal A
with the other floating)
Terminal B
(The common combination
of all like-named pins
connected to terminal B)
1.
All pins except VPS1 3/
All VPS1 pins
2.
All input and output pins
All other input-output pins
1/ Table II is restated in narrative form in 3.4 below.
2/ No connects are not to be tested.
3/ Repeat pin combination I for each named Power supply and for ground
(e.g., where VPS1 is VDD, VCC, VSS, VBB, GND, +VS, -VS, VREF, etc).
3.4
Pin combinations to be tested.
a.
Each pin individually connected to terminal A with respect to the device ground pin(s) connected
to terminal B. All pins except the one being tested and the ground pin(s) shall be open.
b.
Each pin individually connected to terminal A with respect to each different set of a combination
of all named power supply pins (e.g., VSS1, or VSS2 or VSS3 or VCC1 , or VCC2 ) connected to
terminal B. All pins except the one being tested and the power supply pin or set of pins shall be
open.
c.
Each input and each output individually connected to terminal A with respect to a combination of
all the other input and output pins connected to terminal B. All pins except the input or output pin
being tested and the combination of all the other input and output pins shall be open.
TERMINAL C
R1
R2
S1
TERMINAL A
REGULATED
HIGH VOLTAGE
SUPPLY
S2
C1
DUT
SOCKE
T
SHORT
TERMINAL B
Mil Std 883D
Method 3015.7
Notice 8
TERMINAL D
R = 1.5kΩ
C = 100pf
CURRENT
PROBE
(NOTE 6)
ONCE PER SOCKET
ONCE PER BOARD
100 OHMS
10K
+5.5V
10K
10K
10K
1
16
2
15
3
14
0.1pF
PNP390
6
IN 10
+12V
4
13
5
12
6
11
7
10
8
9
26K
9.6K
24K
PNP390
6
IN 10
14.4K
16 PIN-QSOP
10K
DEVICES: MAX 6655/6656
DRAWN BY: HAK TAN
MAX. EXPECTED CURRENT = 5mA
NOTES:
DOCUMENT I.D. 06-5744
REVISION A
MAXIM
TITLE: BI
Circuit (MAX6655/6656)
PAGE
2
OF 3
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