5HIHUHQFH 'HVLJQ *XLGH Part Number 101999RD5008 October 1999

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5HIHUHQFH 'HVLJQ *XLGH Part Number 101999RD5008 October 1999

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Power Telephone Answering Device
5HIHUHQFH 'HVLJQ *XLGH
Part Number 101999RD5008
October 1999
Power Telephone Answering Device User's Guide
ISD5008 REFERENCE DESIGN DISTRIBUTION DISKETTE
There files this diskette. instructions provided this page also provided accompanying diskette text format. TAD2.ZIP file contains following: Tad2.DSN: complete schematic OrCAD Ver. 7.00 format. Tad2.PPT: complete schematic PowerPoint format. Tad2-bom.TXT: parts text format. Tad2-bom.XLS: parts Bill Materials Excel format. V10files.ZIP: zipped copy firmware listings. This includes files. Make sure that have plenty paper when print there many pages this file. TAM2Guide.pdf: Users Guide Adobe format.
INSTALLATION INSTRUCTIONS ACCESS FILES
Verify that your hard drive least free space hold files this diskette. Copy TAD2.ZIP onto your hard drive separate folder (directory). WINZIP open TAD2.ZIP; then again open V10FILES.ZIP. Copy .DSN file your OrCAD project directory print schematics. have OrCAD Version 7.00 higher, PowerPoint version schematics.
Applications Department October 1999 Please address questions, email, chipcorder@isd.com.
Power Telephone Answering Device User's Guide
Voice Solutions Silicon
Power Telephone Answering Device User's Guide
5HIHUHQFH 'HVLJQ *XLGH
Power Telephone Answering System
INTRODUCTION FEATURES.5 POWERING TAD2 OPERATING TAD2 TONE BETWEEN MESSAGES POWER MANAGEMENT. ELECTRICAL DESCRIPTION.10 FIRMWARE CODE.16 SOURCE CODE OVERVIEW SCHEMATIC DIAGRAMS.
Power Telephone Answering Device User's Guide
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ISD5008 ChipCorder® Product provides high-quality, 3-volt, programmable sampling rate, single-chip record/playback solutions 8-minute messaging applications. These messaging applications ideal cellular applications, automotive communications, telephone answering devices portable communications products. CMOS-based device integrates sampling clock, anti-aliasing smoothing filters, multi-level storage array single-chip. enhanced voice features, ISD5008 eliminates external circuitry integrating automatic gain control (AGC), power amplifier/speaker driver, volume control, summing amplifiers, analog switches, interface. Software adjustable input level amplifiers also included, providing flexible interface multiple applications. ISD5008 product designed microprocessor- microcontroller-based system. Addressing, control, duration enabled through Serial Peripheral Interface (SPI) Microwireserial interface minimize count. Recordings stored on-chip non-volatile memory cells, providing zeropower message storage. This unique solution made possible through ISD's patented multilevel storage technology. Voice audio signals stored directly into memory their natural, uncompressed form, providing superior quality voice reproduction. ISD5008 Reference Design, 8-minute ISD5008 combined with ISD4004-12 total minutes storage time. Because ISD5008 includes on-board microphone speaker amplifiers, adding ISD4004-12 easily done simply connecting ports ISD5008.
Voice Solutions Silicon
Power Telephone Answering Device User's Guide
)($785(6
ISD5008 solid state contains only basic answering machine features, also offers following additional features:
One-way call record (phone number, direction, voice mail) Two-way call record (complete conversions) Private one-way message playback (while call) Two-way message playback Voice memo record playback (phone standby) Private call screening Personal outgoing message (given info) Private call announce while call (given CIDCW) In-terminal answering machine Storage minutes single chip memory additional minutes second chip Battery power backup that record incoming messages during power failures display message status with support caller
Power Telephone Answering Device User's Guide
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TAD2 system powered from either cells 4-12 wall adapter, capable through connector. center ground.
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keypad operations menu driven. base menu, "Up" "Down" keys scroll through submenus.
Main Menu
Displays number saved messages TAD.
Play Messages
"Box" symbol button will start play messages routine. messages exist, oldest message played first. messages exist, TAD2 will display message telling user that messages exist. Selecting "Left" arrow will play oldest stored message. While message playing, "Left" arrow rewinds, "Box" will stop message playing, "Right" arrow causes skip ahead next message "Up" "Down" arrows adjust volume. When message finished playing, menu changes "Box", plays message again, "Left" arrow plays previous message, "Right" arrow skips next message, "Down" arrow deletes message, "Up" arrow exits back main menu. After message finished playing user operations requested seconds, message routine will menu goes back Main menu. During time that message playing, data alternately displayed with menu information.
Record Memo
Records memo message (without Data) from microphone. "Box" starts stops recording.
Record
Records outgoing message that played when phone line answered. "Box" starts stops recording.
Voice Solutions Silicon
Power Telephone Answering Device User's Guide
Play
Plays back Outgoing message speaker.
Change Pass Code
Displays currently password. "Left" "Right" arrows move cursor. "Up" "Down" arrows change digit cursor location. "Box" saves password.
Phone Answering
TAD2 will answer phone after rings. outgoing message played first. pressed during outgoing message, message recorded saved. pressed, DTMF commands executed. When calling party hangs recording ended. "Box" will also recording. slave phone taken off-hook, action that currently taking place immediately stopped message saved.
DTMF Commands
When pressed while outgoing message played, stopped. After stopped, user enters pass code. incorrectly entered, TAD2 returns outgoing message after which then entered again. pass code entered correctly, oldest stored message begins playing. Three keys perform following functions. will back ("rewind") currently playing message. currently playing message already beginning, previous message will played. will save currently playing message next message will begin playing. pressed, currently playing message will deleted then next message will begin playing.
Power Telephone Answering Device User's Guide
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next last (1198) ISD5008 played when TAD2 interrupts (EOM OVL) each message. There 1600 tone recorded last rows. desired audible indication could recorded these last rows.
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Power management accomplished using different power savings modes W78LE54 combined with peripheral power modes. W91030 CID2 device, MT88L85 DTMF transceiver, ISD5008, ISD4004 have sleep modes. DAA, display, analog multiplex circuits powered through transistors turned when needed.
Doze Mode
When microcontroller still active waiting timer interrupts user input, processor placed into idle mode. this mode processor core clock input stopped, leaving timers, interrupts, etc. running enabled. While this mode, microcontroller's power consumption dropped 80%. When interrupt received (from timer, etc.), processor again begins execute.
Suspend Mode
firmware implements second inactivity timeout. When this timeout occurs, sub-systems powered down microcontroller suspended. This lowest power mode. When suspend executed, subsystems first powered off. Then state microcontroller's internal registers saved into internal RAM. Note that reset, contents preserved while hardware registers not. Next, microcontroller suspended. activity ceases until system resumed. resume, microcontroller reset. latch implemented allow control reset. output from microcontroller used enable reset latch. While enabled latch will generate reset upon occurrence switch closure, ringing, slave phone going off-hook. When microcontroller reset, same output disables reset latch (all microcontroller port pins HIGH reset) once microcontroller actually reset.
Voice Solutions Silicon
Power Telephone Answering Device User's Guide
Upon resume internal registers restored from settings that were saved during suspend routine. After resume completed, required action will then complete. I.e. menu function, ringing, etc.
Slave Suspend Mode
Anytime slave phone off-hook, W91030 (together w/MT88L85 economy using common crystal) powered while remainder system suspended. tone detected, system resumed. line captured placing off-hook, energizing disconnect slave phone, then data captured. After this, de-energized placed onhook. data stored well displayed that user switch-hook answer second call, desired.
Figure Block Figure TAD2
Display Switch Buffer Control Switches Decode Latch Switch Switch Data W78LE54 Switch Switch DTMF Tranceiver W91030 CID2 AUXIN ISD4004 ISD5008 AUXOUT
ANAOUT
Current Sense Relay Differential
Phone
Ring Audio Audio Line
ANAIN
Microphone
Speaker
Speaker
Power Telephone Answering Device User's Guide
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Power Supply
board supplied with from cells 4-12 from wall adapter, capable connector's center ground. input voltage VDC) supplies regulator, well display's contrast bias generator. output supplies majority TAD2's circuitry; some directly while others powered through transistor switches.
Digital Circuitry
W78LE54 Microcontroller Winbond W78LE54 microcontroller contains code EEPROM, bytes data RAM, three timers, UART, four ports serial port.
Port Port shared between 74HC574 8-bit latch, MT88L85AN DTMF transceiver, 74HC245, ISD5008, ISD4004. port drives input latch. Port bits used communicate with DTMF transceiver. buffer interfaces with display. Bits used data data components.
DTMF DTMF DTMF DTMF DTMF DTMF MISO. DTMF MOSI. Unused. Latch/buffer input. Latch/buffer input. Latch/buffer input. Latch/buffer input. Latch/buffer input. Latch/buffer input. Latch/buffer input. Latch/buffer input.
Voice Solutions Silicon
Power Telephone Answering Device User's Guide
74HC574 8-bit latch that drives several control signals:
FSKEN HIGH enables decoder device. 358PDN HIGH powers DTMF decoder devices down. CIDMUT HIGH mutes phone connected second phone jack. Unused. MICEN HIGH enables Microphone input input Mux. 138_0 encoded input 74HC138 input. 138_1 encoded input 74HC138 input. 138_2 encoded input 74HC138 input.
74HC138 decoder. outputs used chip selects select switch inputs.
DTMFCS\ selects DTMF device. IS2SS\ selects ISD4004 device. IS1SS\ selects ISD5008 device. selects switch selects switch selects switch selects switch selects switch
Power Telephone Answering Device User's Guide
Port Port used follows:
Unused. SLEEP\ enables resume-reset latch during suspend. MEMCLK drives clock line NVRAM. MEMDAT In/out data line NVRAM. VAON\ powers rail. OFFHK\ powers places off-hook state. DISP\ powers display. ISDCLK Drives serial data clock lines.
Port Port used follows:
OUTEN Drives clock line 74HC574 Latch. latch updated rising edge. DECEN\ enables 74HC138 decoded output. DTMFINT\ Input from DTMF encoder/decoder signify receipt DTMF tone. DISDE\ enables display data buffer. DISRS Register select signal display port. DISE signal display port. RING Active HIGH input from device signify receipt ringing. Active HIGH input from signify that phone connected slave phone jack Off-hook state.
Voice Solutions Silicon
Power Telephone Answering Device User's Guide
Port Port used follows:
CIDDAT Serial input from Device into UART. Active input from switch input array. ISDRAC\ Active from pins devices. ISDINT\ Active interrupt from wired ORed RAC's INTs devices. CIDINT\ Active interrupt from device signify receipt carrier into decoder. CASDET Active HIGH input from decoder indicate receipt tone. used. used.
MT88L85AN DTMF Transceiver Mitel MT88L85AN DTMF Transceiver. powered down 358PDN signal. When enabled valid DTMF tone detected, DTMFINT\ driven LOW. microcontroller then enables data with DTMFCS\ reads binary encoded nibble through Port microcontroller also send nibble through Port transmit DTMF tone acknowledge during Call Waiting Caller routine.
W91030 Caller Decoder Winbond W91030 Caller decoder. contains 1200 baud decoder with carrier detect output. decoded serial data stream captured UART within microcontroller. device powered down 358PDN. device also detects ringing tone call-waiting Caller After first ring detect, microcontroller powers decoder monitors CIDINT\. When carrier detected (CIDINT\ LOW), microcontroller then configures UART 1200 baud begins reading data. After preamble been decoded, data stored into memory.
Power Telephone Answering Device User's Guide
When slave phone goes off-hook current sensor (U1) detects current W91030 setup detect tone. When tone detected, acknowledged, then same routine capture data stream. Once processing completed, microcontroller then puts device back sleep (358PDN HIGH).
24LC64 NVRAM 24LC64 NVRAM industry standard bytes) with wire interface. interface implemented through Port bits 2.3. firmware auto-detects size. NVRAM used store message mappings data. retains this data during power outages while changing batteries.
Alphanumeric Display display comprised Optrex DMC-16249 display 74HC245 buffer. display powered down when needed always powered. buffer drives data into display while remaining control signals, driven microcontroller's P2.4 P2.5.
Voice Solutions Silicon
Power Telephone Answering Device User's Guide
Analog Circuitry
Analog input level control ISD5008, contains differential analog input (MIC+ MIC-), singleended analog inputs (AUXIN ANAIN), differential analog output (ANAOUT+ ANAOUT-), single-ended output (AUXOUT), speaker amplifier. inputs multiplexed [CD4066] analog switches. pair switches selects microphone while second pair selects DAA. U8's, [ISD4004] output drives ANAIN U12's [MT88L85] TONE output drives AUXIN. AUXOUT drives input; ANAOUT drives U8's [ISD4004] input. speaker connected speaker outputs ISD5008. ISD5008 switches selected inputs their destination outputs. level control functions within ISD5008 manipulated through serial bus.
implemented discretely with U3A, U3B, U3C, LMC6484 amp, Clare ITC117P integrated function device, Isolation ringer contains opto-isolated relay, diode bridge, Darlington transistor, ring detector. Darlington configured shunt regulator allow current) transformer. coupled phone line through relay. ring signal coupled through into dual LEDs Wire Wire Converter supplies reference voltage while configured wire wire converters. secondary coupled converter. side secondary supplied with reference voltage. other driven through R28. configured both inverting non-inverting amplifier. inverting amplifier received signal non-inverting amplifier transmitted signal. signals summed point R28. result that transmitted signal output minimum below received signal. Above approximately below from receive signal.
Power Telephone Answering Device User's Guide
Interface Caller driven from ring differentially through C13, C14, R34, R35, R43, R47. clamp differential signal between ground rails. Slave Phone slave phone connected LCB110 relay LDA110 opto-isolator configured current sensor. When slave phone goes offhook, current flows through phone. opto-transistor turns which also turns When turned signal goes HIGH, indicating that slave phone off-hook. While slave phone off-hook, microcontroller will monitor W91030's CASDET signal. When detected, taken off-hook energized break current flow slave phone. After data been captured, turned back goes back on-hook.
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firmware uses maintains variables data manage storing playback messages ISD5008 ISD4004. TAD2 uses Message Address Table (MAT) described Application Notes combined with variation actual structure. actual tables maintained within NVRAM. stores data. other stores actual audio message table combined with status byte pointer into table message linked message.
NVRAM
TAD2 NVRAM that used store volatile data tables. NVRAM industry standard 24LC64 with wire interface. NVRAM manipulation performed block basis with maximum bytes transfer.
Message Address Table Structure
list tags data. tags identify beginning each message class data. followed message status byte. length byte following each (first follow MatTag; second others) length data that tag. tag's data follows length byte. each message MatEnd tag. TableEnd indicate that there more messages.
Voice Solutions Silicon
Power Telephone Answering Device User's Guide
Tags Below list definitions:
0x80
MatTag.
Beginning message string. MatTag followed MATLength. message string length bytes long plus MatTag, length byte, MATEnd. Beginning pointer field. CidTag data integer offset into table message with this audio message. message associated with audio message, CidTag message string. CidTag, exists, followed CIDLength (always then byte that message number message table. Beginning audio message string. MesTag precedes actual audio block message. followed MesLength. MesString MesLength long. Audio Blocks section definition actual audio block data. Message address table this message. always followed another MatTag TableEnd tag. message table. There more audio messages.
0x81
CidTag.
0x82
MesTag.
0x8f
MatEnd.
0x9f
TableEnd
Audio Message Blocks Each devices divided into audio blocks. Each ISD5008 audio block consists consecutive rows. Each ISD4004 audio block consists consecutive rows. length time each varies depending upon sample rate. Block0 Block127 (0h.07fh) point ISD5008 while Block128 Block255 (080h.0ffh) point ISD4004.
Power Telephone Answering Device User's Guide
Message Status message status byte follows StatTag StatLen bytes Message Table.
Status. Message New, Clear message been played. -this message message.
Used Block Table
Used Block Table table bits that represent current used status each audio block. table bytes long (256 Audio Blocks bits byte bytes). resides stored NVRAM offset UBTBlock
NVRAM
NVRAM Byte Address 0x00.0x0f Name. Description.
RootBlock
root block bytes long. holds firmware version string some variables needed power used block table block bytes long. holds image Used Block Table case power fail. audio message table holds message table audio messages. message table holds messages.
0x10 0x2f
UBTBlock
0x30 0x17ff
AudioMessageTableBlock
0x1800 0x1fff
CIDMessageTableBlock
Voice Solutions Silicon
Power Telephone Answering Device User's Guide
Maximum audio message store capability
Almost Kbytes NVRAM assigned audio MAT. actual number audio messages that stored varies depending upon number audio blocks used within each message maximum available NVRAM storage. message length limited only available audio storage. minimum length audio message bytes block audio message with CidTag field.
MatTag MatStatus MatLength CIDTag CIDLength CIDData MesTag MesLength MesData EndTag.
Table 2048 bytes NVRAM allocated store messages. Please refer MatTag, MatLength, MsgEnd, MatEnd tags above definitions. message combines these tags with actual message received. pointer store audio sequential message number table. length each message varies. Using average message length Tad2 capable storing messages. Note that this minimum will vary depending upon many name number messages stored.
Power Telephone Answering Device User's Guide
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firmware provided with TAD2 compiled using seven source code files their companion include (*.h) files. general description below while detailed description contained files included with source code file.
Tad2.c
Tad2 contains main program loop. This where menu commands located. other procedures called from this file.
Tadio.c
Tadio contains hardware implementation specific routines. These procedures called other routines when hardware related functions needed. actual also defined here.
NVRam.c
NVRAM related procedures contained this module. NVRAM reads writes performed this module.
ISD.c
contains command processor devices. interrupt routines operations also here.
Mesman.c
Message address table procedures module. routines creating retrieving audio messages here. command processor makes calls this module obtain audio related data needed execute desired command.
Cid.c
caller routines located this module.
Display.c
display routines located this module.
Voice Solutions Silicon
CENTER GROUND. PJ-007
Regulator Digital
VCC3 SHDN BEAD 100uF LT1521-3
MBRS340T3 MBRS340T3
SCHEMATIC DIAGRAMS
VCC3 BATTERY MMBTA55L 270K 100K 22uF 2.2K
Figure Power Schematic
3.0V SENSE
10uF
DISP\
Analog
10uF
DISPWR
Display
.1uF SD103 100K 2.2uF SD103 ~-2.-3VDC DISBIA
LMC555 .001uF
130K
Power Telephone Answering Device User's Guide
Display Bias
Switched Analog (Mic. ISD5008 input mux)
VAON\ 2.2K
Note: This diagram available accompanying disk power.sch.
MMBTA55L
VCC3
FSKEN 358PDN CIDMUT MICEN
VCC3
OUTEN
DTMFCS\
VCC3 VCC3
74HC574
Voltage Monitor/Reset Timeout
100K MN13822-H 100K .1uF
IS2SS\ IS1SS\ S[0.4]
74HC138
Chip Selects
DTMF ISD4004 ISD5008 3.7h Switches
EA/VP
100K_SIP10
2N7002 RESET OUTEN DECEN\ DTMFINT\ VCC3 DISDE\ DISRS DISE CIDDAT KEY\ ISDRAC\ ISDINT\ 39pF 39pF RING P2.0 P2.1 P2.2 P2.3 P2.4 P2.5 P2.6 P2.7 D[0.7] 100K .1uF 100K 11.059MHZ
Figure Digital Schematic
P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7
RESET\
SLEEP\
SLEEP\ MEMCLK MEMDAT
VAON\ OFFHK\ DISP\ ISDCLK ISDCLK VCC3 CIDINT\ CASDET
P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 P3.0/RXD P3.1/TXD P3.2/INT0 P3.3/INT1 P3.4/T0 P3.5/T1 P3.6/WR P3.7/RD
SLEEP\ MEMCLK3 ISDCLK ISDINT\ ISDINT\ DECEN\ DISDE\ DECEN\ OUTEN
VCC3 PSEN ALE/P W78LE54 .1uF
100K_SIP10
VCC3
VCC3 .1uF .1uF .1uF
Winbond W78LE54 256Bytes 8KBytes EEROM
VCC3
NVRAM 8KByte
TONIN .1uF
3.58 INGS VREF OSC1 ST/GT
24LC64
60.4K .1uF
53.6K
CIDDAT CIDINT\ VCC3 TONOUT SD103 358PDN FSKEN CASDET .1uF
CIDA+ CIDA464K
358CLK
INGCFB VREF OSC1
358CLK
OSC2
TONE 39pF .1uF 39pF
PWDN
DTMFCS\ 358PDN DTMFINT\ MT88L85AN
RING\
Note: This diagram available accompanying disk digital.sch.
OSC2 RNGDI RINGRC RINGON DCLK DATA SLEEP FSKE MODE ALGO ALGRC ALGR 825K .1uF 226K
GND2 GND1
DTMF Transceiver
Winbond W91030 Decoder, Ring Detect, VCC3 Detect
W91030 150K RING
Power Telephone Answering Device User's Guide
Voice Solutions Silicon.22uF
Enable Reset Latch from
U14C SLEEP\ 74HC00 VCC3 100K U14B SD103 74HC00 SD103 100K 4.7K KEY\ MMBTA05L 2N7002 VCC3 RESET\ 74HC00 U14A
Reset Ringing Reset Latch
RING\
Reset Slave Phone going Off-Hook
4.7K
Reset Switch Closure
SD103 DISPWR SD103 SD103 22uF SD103
Switches
DISDE\
SD103 SD103 SD103 D[0.7] SD103 SD103 SD103
Figure Display/Keyboard Schematic
Switch Selects
Display Latch
VCC3
Power Telephone Answering Device User's Guide
S[0.4]
74HC245
Display
100K 100K
DMC-16249
DISE DISRS DISBIA
Contrast Control
20K_POT
Note: This diagram available accompanying disk dsp_key.sch.
Size Document Number
Date:
990601-04 DSP_KEY.SCH Wednesday, October 1999 Sheet
D[0.7] VCC3 47uF VCC3 22uF
ISDRAC\ ISDINT\ ISDCLK IS2SS\
AUDOUT ANA+ ANAAMCAP ISD4004
.1uF VCC3
MISO MOSI SCLK XCLK
VCCD VSSD VSSA VCCA VSSA VSSA
.1uF
47uF 22uF .1uF DAAIN .1uF
ISD4004
Figure 5008 Schematic
1.5K
VCCA VCCD VCCD
AUXOUT ANAOUT+ ANAOUTSP+ SPN/C
ISDCLK IS1SS\ ISDRAC\ ISDINT\ 1.5K CD4066BC MIC+ .1uF TONOUT AUXIN ANAIN
MISO MOSI SCLK XCLK
220uF
Speaker
MJ-3536
ISD5008
VSSA VSSA VSSA VSSD VSSD
WM-54B MICAMCAP ISD5008 4.7uF
.1uF
1.5K
CD4066BC
MICEN
ISD5008 Input
CD4066BC
DAAOUT
4.7K 100K
0TIE
Note: This diagram available accompanying disk 5008.sch.
MMBTA05L CD4066BC
Power Telephone Answering Device User's Guide
Size Document Number
Date:
990601-05 ISD5008.SCH Tuesday, October 1999
Sheet
Voice Solutions Silicon
VCC3 SD103 VCC3 SD103 SD103 CIDA+
Differential Input
CIDAVCC3 VCC3 100K MMBTA05L
SD103 619K 619K 100K
VCC3 .022uF_400V
.022uF_400V VCC3
OFFHK\ 2.2K VDAA MMBTA55L P2600EA
LDA110 Line Current Detect
Figure Schematic
Slave Phone Mute Relay
CIDMUT 2.2K MMBTA05L
10UF
LCB110
Slave Phone RJ11
Switched Off-Hook
VCC3 100K RING\ 100K
10_.5W
OUTA BAC/OUTA DARL BASE DARL EMIT BRG+ BRGBRG AC/RLED RLED 15_1% RELAY+ RELAYNC RING COLL RING EMIT ITC117P
8.2K
Telephone Line RJ11
Receive
TONIN DAAOUT .1uF LMC6484AIM 3.2V
Power Telephone Answering Device User's Guide
Integrated Telephone Circuit Relay, Diode Bridge, Darlington Ring Voltage Detect
.47uF_250V
464K
10uF
LMC6484AIM 3.2V LMC6484AIM
Reference Voltage
Note: This diagram available accompanying disk daa.sch.
464K 4.7uF_50V 4.7uF_50V
.1uF
DAAIN .1uF
TRANSFORMER
Transformer
Transmit
Size Document Number
Date:
990601-06 DAA.SCH Wednesday, October 1999 Sheet
,03257$17 127,&(6
warranty each product (Information Storage Devices, Inc.), contained written warranty which governs sale such product. Such warranty contained printed terms conditions under which such product sold, separate written warranty supplied with product. Please refer such written warranty with respect applicability certain applications such product. These Products subject restrictions use. Please contact list current additional restrictions these Products. purchasing these Products, purchaser these Products agrees comply with such restrictions. Please contact clarification restrictions described herein. ISD, reserves right, without further notice, change ChipCorder product specifications and/or information this document improve reliability, functions design. assumes responsibility liability ChipCorder Product. conveys license title, either expressed implied, under patent, copyright, mask work right ChipCorder Product, makes warranties representations that ChipCorder Product free from patent, copyright, mask work right infringement, unless otherwise specified. Application examples alternative uses integrated circuit contained this publication illustration purposes only makes representation warranty that such applications shall suitable specified. 100-year retention 100K record cycle projections based upon accelerated reliability tests, published Reliability Report, neither warranted guaranteed ISD. Copyright© 1999, (Information Storage Devices, Inc.) rights reserved. registered trademark ISD. ChipCorder trademark ISD. other trademarks properties their respective owners.
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Part 101999RD5008
Power Telephone Answering Device User's Guide

5HIHUHQFH 'HVLJQ *XLGH Part Number 101999RD5008 October 1999

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