CypressメーカーCY14B256Kの使用説明書/サービス説明書
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CY14B256K 256 Kbit (32K x 8) nvSRAM with Real T ime Clock Cypress Semiconductor Corpora tion • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600 Document Number: 001-06431 Rev .
CY14B256K Document Number: 001-06431 Rev . *H Page 2 of 28 Pin Configurations Figure 1. 48-Pin SSOP Pin Definitions Pin Name Alt IO T ype Description A 0 –A 14 Input Address Inputs. Used to select one of the 32,768 bytes of the nvSRAM. DQ0-DQ7 Input or Output Bidirectional Dat a IO lines .
CY14B256K Document Number: 001-06431 Rev . *H Page 3 of 28 Device Operation The CY14B256K nvSRAM consists of two functional components paired in the same physical cell. Th e component s are SRAM memory cell and a nonvolatile QuantumTrap cell. The SRAM memory cell operates as a standard fast static RAM.
CY14B256K Document Number: 001-06431 Rev . *H Page 4 of 28 t DELA Y , multi ple SRAM READ operations take place. If a WRITE is in progress when HSB is pulled LOW , it allows a time, t DELA Y , to complete. However , any SRAM WRITE cycles requested after HSB goes LOW are inhibited until HSB retu rns HIGH.
CY14B256K Document Number: 001-06431 Rev . *H Page 5 of 28 Low A verage Active Power CMOS technology provides the CY14B25 6K the benefit of drawing significantly le ss current when it is cycled at times longer than 50 ns. Figure 3 shows the relation ship between I CC and READ and/or WRITE cycle time.
CY14B256K Document Number: 001-06431 Rev . *H Page 6 of 28 T able 1. Mode Selection CE WE OE A13–A0 Mode IO Power H X X X Not Selected Output High Z S tandby L H L X Read SRAM Output Data Active L L.
CY14B256K Document Number: 001-06431 Rev . *H Page 7 of 28 Real Time Clock Operation nvTIME Operation The CY14B256K consists of internal registe rs that contain clock, alarm, watchdog, interrupt, and co ntro l functions. RTC registers use the last 16 address locati ons of the SRAM .
CY14B256K Document Number: 001-06431 Rev . *H Page 8 of 28 Calibrating the Clock The RTC is driven by a quartz controlled oscillator with a nominal frequency of 32.768 kHz. Clock accu racy depends on the quality of the crystal and calibration. The crystal oscillators typically have an error of + 20ppm to + 35ppm.
CY14B256K Document Number: 001-06431 Rev . *H Page 9 of 28 Power Monitor The CY14B256K provides a power management sch eme with power fail interru pt capability . It also controls the inte rnal switch to backup po wer for the cl ock and prot ects t he memory from lo w V CC access.
CY14B256K Document Number: 001-06431 Rev . *H Page 10 of 28 Figure 5. Interrupt Block Diagram Figure 6. RTC Recommende d Componen t Configurati on WDF - W atchdog T imer Flag WIE - W atchdog I nterrup.
CY14B256K Document Number: 001-06431 Rev . *H Page 1 1 of 28 T able 3. RTC Register Map [5, 6] Register BCD Format Data [5 ] Fu nction/Range D7 D6 D5 D4 D3 D2 D1 D0 0x7FFF 10s Y ears Y ears Y ears: 00.
CY14B256K Document Number: 001-06431 Rev . *H Page 12 of 28 T able 4. Register Map Detail 0x7FFF Time Keeping - Y ears D7 D6 D5 D4 D3 D2 D1 D0 10s Y ears Y ears Contains the lower two BCD digits of the year . Lower nibble (four bits) contains the value for years; upper nibble (four bits) contains the value for 10s of years.
CY14B256K Document Number: 001-06431 Rev . *H Page 13 of 28 0X7FF8 Calibration/Con trol D7 D6 D5 D4 D3 D2 D1 D0 OSCEN 0 Calibration Sign Calibration OSCEN Oscillator Enable. When set to 1, the oscillator is stopped . When set to 0, the oscillator runs.
CY14B256K Document Number: 001-06431 Rev . *H Page 14 of 28 0x7FF4 Alarm - Hours D7 D6 D5 D4 D3 D2 D1 D0 M 10s Alarm Hours Alarm Hours Contains the alarm value for the hours and the ma sk bit to select or desele ct the hours value. M Match. When this bit is set to 0, the hours valu e is used in the alarm match.
CY14B256K Document Number: 001-06431 Rev . *H Page 15 of 28 Maximum Ratings Exceeding maximum ratin gs may impair the useful life of the device. These user guidelines are not teste d. S torage T emperature ............. .............. ...... –65 ° C to +150 ° C Ambient T emper ature wit h Power Applied .
CY14B256K Document Number: 001-06431 Rev . *H Page 16 of 28 Dat a Retention and Endurance Parameter Description Min Unit DA T A R Data Retention 20 Y ears NV C Nonvolatile STORE Operations 200 K Cap acitance These parameters are guaranteed but not tested.
CY14B256K Document Number: 001-06431 Rev . *H Page 17 of 28 AC Switching Ch aracteristics Parameter Description 25 ns 35 ns 45 ns Unit Min Max Min Max Min Max Cypress Parameter Alt.
CY14B256K Document Number: 001-06431 Rev . *H Page 18 of 28 AC Switching Ch aracteristics (continued) Parameter Description 25 ns 35 ns 45 ns Unit Min Max Min Max Min Max Cypress Parameter Alt.
CY14B256K Document Number: 001-06431 Rev . *H Page 19 of 28 AutoStore or Power Up RECALL Parameter Descrip tion CY14B256K Unit Min Max t HRECALL [17] Power Up RECALL Duration 40 ms t STORE [18, 19] STORE Cycle Duration Commercial 12.5 ms Industrial 15 ms V SWITCH Low V oltage T rigger Level 2.
CY14B256K Document Number: 001-06431 Rev . *H Page 20 of 28 Sof tware Con trolled STORE/RECALL Cycles [20, 21] Parameter Alt. Parameter Descriptio n 25 ns 35 ns 45 ns Unit Min Max Min Max Min Max t RC.
CY14B256K Document Number: 001-06431 Rev . *H Page 21 of 28 Hardware STORE Cycle Parameter Alt. Parameter Description CY14B256K Unit Min Max t DELA Y [22] Time Allowed to Comp lete SRAM Cycle 1 70 μ s t PHSB t HLHX Hardware STORE Pulse Width 15 ns Figure 15.
CY14B256K Document Number: 001-06431 Rev . *H Page 22 of 28 RTC Characteristics Parameter Description T est Conditions Min Max Unit I BAK [25] RTC Backup Current Commercial 300 nA Industrial 350 nA V RTCbat [26] R TC Battery Pin V oltage 1.8 3.3 V V RTCca p [27] RTC Capacitor Pin V oltage 1.
CY14B256K Document Number: 001-06431 Rev . *H Page 23 of 28 Part Numbering Nomenclature CY 14 B 256 K - SP 25 X C T Option: T -T ape and Reel Blank - S td.
CY14B256K Document Number: 001-06431 Rev . *H Page 24 of 28 Ordering Information All the below mentioned parts are Pb-free. Contact your local Cypress sales representative for availability of these parts.
CY14B256K Document Number: 001-06431 Rev . *H Page 25 of 28 Package Diagrams Figure 17. 48-Pin Shrunk Small Outline Package (51-85061) 51-85061-* C [+] Feedback.
CY14B256K Document Number: 001-06431 Rev . *H Page 26 of 28 Document History Page Document Title: CY14B256K 256 Kbit (32K x 8) nvSRAM with Real Time Clock Document Number: 001-06431 Rev .
CY14B256K Document Number: 001-06431 Rev . *H Page 27 of 28 *H 2663934 GVCH/PYRS 02/24/09 U pdated Features section Updated pin definition o f WE pin Updated “Reading the clock”, “Backup Power”, “S topping and starting the Oscillator” and “Alarm” descriptions under R TC operation Modified “Figure 4.
Document Number: 001-06431 Rev . *H Revised February 24, 2009 Page 28 of 28 All product s and comp any names mentioned in thi s document ar e the tradem arks of their re spective holder s. CY14B256K © Cypress Sem iconductor Corp oration, 2006-2009. The informatio n contained herein is su bject to change without notice.
デバイスCypress CY14B256Kの購入後に（又は購入する前であっても）重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります：
Cypress CY14B256Kをまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはCypress CY14B256Kの技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。Cypress CY14B256Kの取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。Cypress CY14B256Kで得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
Cypress CY14B256Kを既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はCypress CY14B256Kの不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、Cypress CY14B256Kに関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちCypress CY14B256Kデバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。
