S-3511A S-3511A CMOS real-time clock that supplies sets time cale

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S-3511A S-3511A CMOS real-time clock that supplies sets time cale

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REAL-TIME CLOCK
S-3511A
S-3511A CMOS real-time clock that supplies sets time calendar data when requested CPU. Soft-ware processing reduced connecting wires interrupt/alarm function. constant voltage drive oscillation circuit also enables current consumption.
Features
current consumption typ.(VDD 25°C) Wide operating voltage range second, minute, hour, day, date, month year Interface with lines Built-in automatic calendar, automatic leap-year calculation 2099 Built-in voltage detector Built-in constant voltage circuit Built-in flag generation circuit during power-on power down Built-in alarm interrupter Steady-state interrupt frequency/duty setting function Built-in oscillation circuit (Internal External Crystal)
Applications
Cellular phone variety pagers Camera
Package
8-Pin SSOP (pin pitch: 0.65 8-Pin (pin pitch: 1.27 (Package drawing code FS008-A) (Package drawing code FJ008-D)
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A Block Diagram
XOUT
Clock generating circuit
Oscillating circuit
Timing generation
Register
Comparator
Status register
Second
Minute
Hour
week
Month
Year
Power voltage detecting circuit Constant voltage circuit
Shift register
Serial Interface
Figure
Seiko Instruments Inc.
Rev. 1.4_00 Product Code Structure
S-3511AE direction tape specifications Package name (abbreviation) 8-Pin SSOP 8-Pin Description (fixed)
REAL-TIME CLOCK S-3511A
Assignment
Package S-3511AEFS XOUT 8-Pin SSOP view
S-3511AEFJ XOUT
8-Pin view
Figure
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A
S-3511AECA
XOUT
S-3511A
Remark
size 2.10 1.60 Sizes shown design purposes only. corners shrink approximately after dicing. size:
Coordinates Symbol X-Coordinate XOUT -890 -890 -890 -890
Y-Coordinate -114 -641 Figure
Symbol
X-Coordinate
Y-Coordinate -240 -641
Seiko Instruments Inc.
Rev. 1.4_00 Description Pins
Table Symbol Description
REAL-TIME CLOCK S-3511A
Configuration
XOUT
Alarm interrupt output pin. open-drain output Depending mode register status register, outputs protective diode side Clock when time reached. disabled VDD) rewriting status register. Crystal oscillator connect (32,768 (Internal External Negative power supply (GND) Chip select input pin. During allows data input/output. allows data input. During Hi-Z state. inputdisabled state. Serial clock input pin. input/output data from performed synchronization with this clock. However, clock accepted while "L". Serial data input/output pin. normally Hi-Z state while "L". When changes from "H", input pin. will input output pin, depending subsequently input command. Positive power supply pin. CMOS input (Included pulldown resistance. protective diode side VDD)
CMOS input protective diode side VDD)
open-drain output protective diode side VDD) CMOS input
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A Absolute Maximum Ratings
Item Symbol Table Applicable pin, conditions Rating
Unit
Power voltage VSS-0.3 VSS+6.5 Input voltage SCK,SDA,CS -0.3 +6.5 Output voltage VOUT SIO,INT -0.3 +6.5 Operating temperature Topr VDD=3.0 Storage temperature Tstg +125 Caution absolute maximum ratings rated values exceeding which product couldsuffer physical damage. These values must therefore exceeded under conditions.
Recommended Operating Conditions
Item Power voltage Operating temperature
Symbol
Table Condition
Min.
Typ.
Max.
Unit
Topr
Oscillation Characteristics
Table
(Unless otherwise specified Ta=25°C, VDD=3 DS-VT-200 (crystal oscillator, CL=6 32,768 manufactured Quartz Techno Ltd.)
Item Oscillation start voltage Oscillation start time IC-to-IC frequency diversity Frequency voltage diversity Input capacity Output capacity
Symbol VSTA TSTA
Condition Within seconds VDD=1.7 Applied Applied XOUT
Min.
Typ.
Max.
Unit ppm/V
Seiko Instruments Inc.
Rev. 1.4_00 Electrical Characteristics
Table characteristics
REAL-TIME CLOCK S-3511A
(Unless otherwise specified Ta=25°C, VDD=3 DS-VT-200 (crystal oscillator, CL=6 32,768 manufactured Quartz Techno Ltd.)
Item Operating voltage range Current consumption Current consumption Input leak current Input leak current Input current Input current Output leak current1 Output leak current2 Input voltage Input voltage Output current Output current Power voltage detection voltage Power voltage detection voltage
Symbol IDD1 IDD2 IIZH IIZL IIL1 IIL2 IOZH IOZL IOL1 IOL2 VDET1 VDET2
Applicable
Condition
Min. -0.5 -0.5 -0.5 -0.5 1.72
Typ.
Max.
Unit
+70°C During communications During communications (SCK=100 kHz) SCK, VIN= SCK, VIN= VIN= VIN= INT, VOUT=VDD INT, VOUT=VSS SIO, SCK, SIO, SCK, VOUT=0.4 VOUT=0.4 Ta=+25°C +70°C
Table characteristics
(Unless otherwise specified Ta=25°C, VDD=5 DS-VT-200 (crystal oscillator, CL=6 32,768 manufactured Quartz Techno Ltd.)
Item Operating voltage range Current consumption Current consumption Input leak current Input leak current Input current Input current Output leak current1 Output leak current2 Input voltage Input voltage Output current Output current Power voltage detection voltage Power voltage detection voltage
Symbol IDD1 IDD2 IIZH IIZL IIL1 IIL2 IOZH IOZL IOL1 IOL2 VDET1 VDET2
Applicable SCK, SCK, INT, INT, SIO, SCK, SIO, SCK,
Condition +70°C During communications During communications (SCK=100 kHz) VIN= VIN= VIN= VIN= VOUT=VDD VOUT=VSS VOUT=0.4 VOUT=0.4 Ta=+25°C +70°C
Min. -0.5 -0.5 -0.5 -0.5 1.72
Typ.
Max.
Unit
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A Electrical Characteristics
(S-3511A, RL=10 CL=80
Table characteristics
Conditions VDD=1.7 70°C Input; VIH=0.8 VDD, VIL=0.2 VDD, Output; VOH=0.8 VCC, VOL=0.2 (VCC=5.0
Item
Symbol
Min.
Typ.
Max.
Unit
Clock pulse width tSCK 250000 Setup time before rising Hold time after rising tCSH Input data setup time tISU Input data hold time tIHO Output data definition time tACC Setup time before falling tCSS Hold time after falling Input rising/falling time Caution Since output form open-drain output, rising time tACC determined values load resistance (RL) load capacity (CL) outside this reference value. Table characteristics
Conditions VDD=3.0 70°C Input; VIH=0.8 VDD, VIL=0.2 VDD, Output; VOH=0.8 VCC, VOL=0.2 (VCC=5.0
Item
Symbol
Min.
Typ.
Max.
Unit
Clock pulse width tSCK 250000 Setup time before rising Hold time after rising tCSH Input data setup time tISU Input data hold time tIHO Output data definition time tACC Setup time before falling tCSS Hold time after falling Input rising/falling time 0.05 Caution Since output form open-drain output, rising time tACC determined values load resistance (RL) load capacity (CL) outside this reference value. Table characteristics
Conditions VDD=5.0 70°C Input; VIH=0.8 VDD, VIL=0.2 VDD, Output; VOH=0.8 VCC, VOL=0.2 (VCC=5.0
Item
Symbol
Min.
Typ.
Max.
Unit
Clock pulse width tSCK 250000 Setup time before rising Hold time after rising tCSH Input data setup time tISU Input data hold time tIHO Output data definition time tACC Setup time before falling tCSS Hold time after falling Input rising/falling time 0.05 Caution Since output form open-drain output, rising time tACC determined values load resistance (RL) load capacity (CL) outside this reference value. Seiko Instruments Inc.
Rev. 1.4_00 Timing Charts
tCSH
REAL-TIME CLOCK S-3511A
tCSS
Figure tISU tIHO tR,tF Figure
Input data
tSCK
tSCK
tACC
Output data
Figure
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A Description Operation
Serial interface
S-3511A receives various commands 3-wire serial interface read/write data. This section covers transfer methods this product. Communication data configuration After turning "H", send 4-bit fixed code "0110" succeedingly transfer command 3-bit length read/write command 1-bit length.
Fixed code
Command
Read/Write
Figure Communication data Command configuration There seven types commands which read from write various registers. table below lists them. command that listed table provides operation. Table Command list Description Reset (year), (month), (day), (day week), (minute), (second)) Status register access Real-time data access (year data Real-time data access (hour data Alarm time/frequency duty setting Test mode start Test mode
Don't care this command. This command access-disabled specific test. Data reading When input data from synchronization with falling after turning "H", data included into inside S-3511A eighth rising clock state data reading reached when "1". state leads output data corresponding each command synchronization with falling subsequent clock input. Remark When number clocks less than eight, state clock waiting reached processing done. When clocks more than required, they processed order from first clocks other than those required ignored.
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A
Real-time data reading
TEST
Command
Year data Output mode switching
Second data Input mode switching
Real-time data reading
TEST
Command
Hour data Output mode switching
Second data Input mode switching
Status register reading
POWER
Command Output mode switching
Status data
Input mode switching
Figure Read communication
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A
Data writing When input data from synchronization with falling after turning "H", data included into inside S-3511A eighth rising clock state data writing reached when "0". state, data written registers according each command synchronization with falling subsequent clock input.
Real-time data writing
TEST
Command
Year data
Second data
Real-time data writing
TEST
Command
Hour data
Second data
Status register writig
POWER
Command
Status data
Figure Write communication
Seiko Instruments Inc.
Register configuration
REAL-TIME CLOCK S-3511A
Real-time data register real-time data register 56-bit register which stores code data year, month, day, week, hour, minute second. read/write operation performed realtime data access command sends receives data from first digit year data.
Year data Sets lower digits Christian links together with auto calender feature till 2,099. Month data count value automatically changed auto calender feature: (leap year) (common year) data
week data septenary counter. that corresponds week.
Hour data AM/PM 12-hour expression, 0:AM 1:PM. 24-hour expression, this flag meaning either must written.
Minute data
TEST
Second data test flag TEST Turns during test mode.
Figure
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A
Status register status register 8-bit register which allows display various modes. POWER flag read-only others read/write-enabled.
POWER 12/24 INTAE INTME INTFE
Figure B7:POWER This flag turns power voltage detecting circuit operates during power-on changes power voltage (below VDET). Once turning "1", this flag does turns back even when power voltage reaches exceeds detection voltage. When flag "1", must send reset command status register read command), turn "0". read-only flag. This flag used 12-hour 24-hour expression. 12-hour expression 24-hour expression B5:INTAE This flag used choose state output with alarm interrupt output set. Enable this flag after setting alarm time that forms meeting condition register: Alarm interrupt output disabled. Alarm interrupt output enabled. B3:INTME This flag used make output per-minute edge interrupt per-minute steady interrupt. make output per-minute steady interrupt, INTME INTFE Alarm interrupt selected frequency steady interrupt output Per-minute edge interrupt per-minute steady interrupt output B1:INTFE This flag used make output per-minute steady interrupt output period minute, duty) selected frequency steady interrupt. Note that register considered data frequency/duty selected frequency steady interrupt chosen. Alarm interrupt per-minute edge interrupt output Per-minute steady interrupt selected frequency steady interrupt output B4,B2 having written contents, they ignored. When they read, read from them.
B6:12/24
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A
Alarm time/Frequency duty setting register alarm time/frequency duty setting registers 16-bit registers which sets alarm time frequency duty. They switched INTAE INTFE register. AM/PM flag must accordance with 12-hour 24-hour expression. AM/PM flag rightly then hour data alarm data. alarm time/frequency duty setting register write-only register. When INTAE
register
Figure register (alarm) register considered alarm time data. Having same configuration time minutes registers real-time data register configuration, they represent hours minutes with codes. When setting them, none-existent day. Data must accordance with 12-hour 24-hour expression that status register. When INTFE register considered frequency duty data. turning each registers "1", frequency corresponding each chosen ANDed form.
register
32768 16384 8192 4096
2048 1024
Figure register (frequency duty)
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A
Example 000A
output
selected frequency steady interrupt output
Figure Clock output Test flag test flag 1-bit register which assigned second data real-time data register. transferred data considered test mode starting command receiving test mode starting command noises, set. When set, must send test mode ending command reset command. Initialization Note that S-3511A different initializing operations, depending states. When power turned When power turned status register "82h" register "8000h" power-on detecting circuit. other words, sets (POWER flag) status register clock output from pin. This provided adjust oscillating frequencies. normal use, reset command must sent when power turned Real-time data register (year), (month), (day), (day week), (hour), (minute), (second) Status register "82h" register "8000h" When power voltage detecting circuits operates power voltage detecting circuit included S-3511A operates sets (POWER flag) internal status register when power turned power voltage reduced. Once set, held even after power voltage gets equal higher than detection voltage, i.e., power voltage detector threshold. When flag "1", must send reset command from initialize flag. this point, other registers does change. However, POWER flag during power-on reset (S-3511A does reach indefinite area during backup), have send reset command.
Seiko Instruments Inc.
When reset command received When reset command received, each register turns follows:
REAL-TIME CLOCK S-3511A
Real-time data register (year), (month), (day), (day week), (hour), (minute), (second) Status register "00h" register "0000h"
POWER flag Command status read command data command Don't care status data reset command
LINE
POWER
backup state (S-3511A does reach indefinite area)
POWER command data command
LINE
POWER status data
status read command
real-time data read command
Figure Initializing
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A
Processing none-existent data end-of-month
When writing real-time data, validate treat invalid data end-of-month correction. [None-existent data processing] Table Register Normal data Error data Result Year data Month data data week data Hour data (24-hour) (12-hour) Minute data Second data 12-hour expression, write AM/PM flag. AM/PM flag ignored 24-hour expression, o'clock o'clock read read operation. None-existent data processing second data performed carry pulse second after writing. this point, carry pulse sent minute counter. [End-of-month correction] none-existent corrected first next month. example, February changed March Leap-year correction also performed here. Interrupt There five types output format from pin, which selected INTAE, INTME INTFE bits status register. Alarm interrupt output Alarm interrupt enabled setting hour minute data register turning status register's INTAE INTME INTFE "0". When hour data met, output from pin. Since output held, rewrite INTAE status register through serial communication turn output high (OFF state). coincidence signal retains minute. attention that signal output from once again when disable enable communication executed during this one-minute period. Selected frequency steady interrupt output When frequency/duty data register turn status register's INTME INTFE "1", clock register output from pin. Per-minute edge interrupt output When first minute carry performed after status register's INTME with INTFE with "0", output from pin. Since output held, rewrite INTAE, INTME INTFE status register through serial communication. When perform disable enable communication while minute carry processing signal being retained (for ms), signal output from again.
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A
Per-minute steady interrupt output When first minute carry performed after status register's INTME INTFE with "1", clock output from with period minute duty). When perform disable enable communication while "L", signal output from again. Caution changing output mode, give care state register output. per-minute edge interrupt output per-minute steady interrupt output chosen, register have meaning. Table Interrupt description INTFE Description Output disabled Selected frequency steady interrupt output Per-minute edge interrupt output Per-minute steady interrupt output Alarm interrupt output
INTAE Don't care
INTME
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A
Alarm interrupt output
Change program INTAE INTME=INTFE=0 Alarm time corresponds Alarm time corresponds
signal output again case minute less
Selected frequency steady interrupt output
Change program INTFE INTAE=INTME=0 Free output starts
Per-minute edge interrupt output
Change program INTME INTAE=INTFE=0 signal output again case less Minute-carry processing Minute-carry processing
Per-minute steady interrupt output
Change program (OFF)
INTFE,INTME INTAE=0
Minute-carry processing
Minute-carry processing
Minute-carry processing
Minute-carry processing
Minute-carry processing
signal output again case less.
signal output case more. signal output next minute-carry processing.
During power-on detecting circuit operation
Change reset command INTFE INTAE=INTME=0
Figure Output mode
Seiko Instruments Inc.
Power voltage detecting circuit
REAL-TIME CLOCK S-3511A
S-3511A internal power voltage detecting circuit. This circuit gives sampling movement only 15.6 once second. power voltage decreases below detection voltage (VDET), latch circuit latches level, sampling movement stops. Only when subsequent communication status read command, output latch circuit transferred sift register sampling movement resumed. Decrease power voltage monitored reading POWER flag. That say, once decrease power voltage detected, detecting operation performed held unless perform initialization send status read command. Caution When power voltage increased first read operation performed after decrease power voltage occurs latch circuit latches "H", read POWER flag. However, next read operation performed after sampling detecting circuit, POWER flag reset since sampling subsequently allowed. timing diagram below.
VDET
Communication Stop Stop Stop
Sampling pulse
Latch circuit output
POWER flag VDET
Communication Sampling pulse Stop Stop Stop Stop
Latch circuit output POWER flag
[Timing sampling pulse]
Carry pulse Latch timing 15.6
Carry-up timing
Sampling pulse
Figure Timing power voltage detecting circuit
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A
Example software treatment Initialization flow power-on START
Power
S-3511A back-up power turned only side, reset command does need transferring. conditions good (e.g., noise) probable changes commands occurs serial communications, recommended make sure TEST flag.
POWER=1 Reset command transfer
test ending command used alternately
TEST=1 Reset command transfer
Status register setting command transfer Real-time data setting command transfer register setting command transfer
Figure Initialization flow
Seiko Instruments Inc.
Rev. 1.4_00 Samples Application Circuits
S-3511AEFS External XOUT
REAL-TIME CLOCK S-3511A
System power
with protective diode side, relation VCCVDD problem. give great care standard. Make communications after system power turned stable state obtained. Figure Application circuit
Power switching circuit S-3511AEFS External XOUT System power
Make communications after system power turned stable state obtained. Figure Application circuit Caution application circuits above guarantee proper operation. Evaluate actual application determine correct constants.
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A
Adjustment Oscillating Frequency
Configuration oscillating circuit Since crystal oscillation sensitive external noises (clock accuracy affected), following measures essential optimizing your oscillating circuit configuration: Place S-3511A, crystal oscillator external capacitor (Cg) close each other possible. Make high insulation resistance between pins substrate wiring patterns XOUT. place signal power lines close oscillating circuit.
XOUT Crystal oscillator:32,768 CL=6 Cg=3
Oscillating circuit internal constant standard values: Rf=20 Rd=220 Cd=12
S-3511A
Figure Connection diagram
Seiko Instruments Inc.
Measurement oscillating frequencies
REAL-TIME CLOCK S-3511A
When power turned S-3511A internal power-on detecting circuit operating outputs signal from select crystal oscillator optimize value. Turn power measure signal with frequency counter following circuit configuration shown Figure Remark error range relation time shifted approximately seconds month calculated using following expression). ppm) seconds minutes hours days 2.592 seconds
XOUT
Open pull-up
Frequency counter
S-3511A
Figure Connection diagram Caution high-accuracy frequency counter order). Since signal continues output, must send reset command normal operation. Determine with frequency slow/fast range property referred.
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A
Adjustment oscillating frequencies
Matching crystal oscillator with nominal frequency must performed with parasitic capacitance board included. Select crystal oscillator optimize value accordance with flow chart below.
START
Select crystal oscillator.
Variable capacity <Trimer capacitor> <Fixed capacitor> center variable capacitor.
specification
Does frequency match Change
optimal value
Make fine adjustment frequency variable capacity.
Figure Crystal oscillator setting flow making matching adjustment with crystal, contact appropriate crystal maker determine value (load capacity) value (equivalent serial resistance). value value Typ. recommended values. value selection must performed actual since parasitic capacitance affects Select value range from frequency does match, change value crystal. Adjust rotation angle variable capacity that capacity value somewhat smaller than center, confirm oscillating frequency center value variable capacity. This done order make capacity center value smaller than half actual capacity value because smaller capacity value makes greater quantity changes frequency. frequency does match, change value crystal. Caution Oscillating frequencies changed ambient temperature power voltage. Refer property samples. crystal oscillator operates slower higher lower ambient temperature than 25°C. Therefore, recommended adjust oscillator operate somewhat faster normal temperature.
Seiko Instruments Inc.
Rev. 1.4_00 Precautions
REAL-TIME CLOCK S-3511A
apply electrostatic discharge this that exceeds performance ratings ofthe built-in electrostatic protection circuit. claims responsibility disputes arising connection with infringement products including this patents owned third party.
Seiko Instruments Inc.
REAL-TIME CLOCK S-3511A Characteristics (Reference Data)
Standby current IDD1 [µA] VDD=3 [pF] Operating drain current Input clock Ta=25°C VDD=5 IDD1 [µA] Ta=25°C Standby current
Ta=25°C
Standby current temperature VDD=5
IDD2 [µA]
VDD=5
IDD1 [µA]
VDD=3
VDD=3 1,000 frequency [kHz] Oscillating frequency [ppm] [pF]
Seiko Instruments Inc.
[°C] Oscillating frequency [ppm] Ta=25°C
Ta=25°C VDD=5
VDD=3
Oscillating frequency temperature Ta=25°C, VDD=3
REAL-TIME CLOCK S-3511A
Oscillation start time VDD=5 Ta=25°C
[ppm] -120 -160 [°C] Output current (VOUT IOL1) TSTA [mS]
VDD=3
[pF] (10) Output current (VOUT IOL2)
pins, Ta=25°C VDD=5
IOL2 [mA]
pins, Ta=25°C VDD=5
IOL1 [mA] VDD=3
VDD=3
VOUT
VOUT
Seiko Instruments Inc.
3.1±0.3
0.15 -0.05
+0.1
0.22±0.1 0.65
FS008-A-P-SD-1.1
TITLE SCALE UNIT
SSOP8-A-PKG Dimensions FS008-A-P-SD-1.1
Seiko Instruments Inc.
1.55±0.05
4.0±0.1
2.0±0.05
0.3±0.05
8.0±0.1
1.55±0.05
1.4±0.1
(4.0)
6.9±0.1
Feed direction
FS008-A-C-SD-1.1
TITLE SCALE UNIT
SSOP8-A-Carrier Tape FS008-A-C-SD-1.1
Seiko Instruments Inc.
13.5±0.5
Enlarged drawing central part
2±0.5 13±0.2
2±0.5
21±0.8
FS008-A-R-SD-1.1
TITLE SCALE UNIT
SSOP8-A-Reel FS008-A-R-SD-1.1
QTY. 2,000
Seiko Instruments Inc.
5.02±0.2
0.20±0.05
1.27
0.4±0.05
FJ008-A-P-SD-2.1
TITLE SCALE UNIT
SOP8J-A-PKG Dimensions FJ008-A-P-SD-2.1
Seiko Instruments Inc.
2.0±0.05
4.0±0.1(10 pitches:40.0±0.2) 0.3±0.05
5°max.
8.0±0.1
2.1±0.1
6.7±0.1
Feed direction
FJ008-D-C-SD-1.1
TITLE SCALE UNIT
SOP8J-D-Carrier Tape FJ008-D-C-SD-1.1
Seiko Instruments Inc.
2±0.5 Enlarged drawing central part 2±0.5 13.5±0.5
FJ008-D-R-SD-1.1
TITLE SCALE UNIT
SOP8J-D-Reel FJ008-D-R-SD-1.1
QTY. 2,000
Seiko Instruments Inc.
information described herein subject change without notice. Seiko Instruments Inc. responsible problems caused circuits diagrams described herein whose related industrial properties, patents, other rights belong third parties. application circuit examples explain typical applications products, guarantee success specific mass-production design. When products described herein regulated products subject Wassenaar Arrangement other agreements, they exported without authorization from appropriate governmental authority. information described herein other purposes and/or reproduction copying without express permission Seiko Instruments Inc. strictly prohibited. products described herein cannot used part device equipment affecting human body, such exercise equipment, medical equipment, security systems, equipment, apparatus installed airplanes other vehicles, without prior written permission Seiko Instruments Inc. Although Seiko Instruments Inc. exerts greatest possible effort ensure high quality reliability, failure malfunction semiconductor products occur. user these products should therefore give thorough consideration safety design, including redundancy, fire-prevention measures, malfunction prevention, prevent accidents, fires, community damage that ensue.

S-3511A S-3511A CMOS real-time clock that supplies sets time cale

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