2711P-RDT10C

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描述

2711P-RDT10C

PCM單元由一小塊硫族化合物合金構(gòu)成(即，至少含有一種元素周期表中的VI族元素，外加一種V和IV族元素)。相同類型的材料也廣泛用于可重寫的光存儲(chǔ)介質(zhì)的有效層，如CD和DVD。通過電脈沖施加熱量，就可以讓PCM單元快速從有序的結(jié)晶相(電阻較低)快速切換為無序的、無定形的相(電阻較高)。從單晶相到無定形相的切換以及逆向的變化，是由熔化和快速冷卻(或者一種稱為重結(jié)晶的稍微慢一些的過程)來實(shí)現(xiàn)的。熔化溫度在500oC~600oC之間的GST(鍺、銻和碲)，已經(jīng)成為最有前途的PCM器件材料之一。
由于上述這些合金的晶體相和無定形相的電阻值不同，這些器件可以存儲(chǔ)二進(jìn)制的數(shù)據(jù)。高電阻的無定形態(tài)代表二進(jìn)制0；低電阻的晶體態(tài)代表1。在無定形相中，GST材料原子在短程內(nèi)具有有序結(jié)構(gòu)，自由電子密度較低，這意味著高電阻率。這有時(shí)被稱為RESET相，因?yàn)樗窃赗ESET操作后形成的，在該操作中，DUT的溫度升高至略超過熔點(diǎn)，然后GST突然淬火冷卻。冷卻速率對于無定形層的形成極為關(guān)鍵。
在結(jié)晶相中，GST材料具備了長程原子有序性和高自由電子密度，從而形成了較低的電阻率。這也稱為SET相，因?yàn)樗窃赟ET操作完成后形成的，在該操作中，材料的溫度上升至重結(jié)晶溫度以上，但低于熔點(diǎn)，然后以稍慢的速度冷卻至容許晶粒在整個(gè)層內(nèi)形成。結(jié)晶相的電阻的范圍一般是1k~10k。結(jié)晶相是一個(gè)低能量態(tài)；在材料處于無定形相時(shí)，若對其加熱至接近結(jié)晶溫度，它傾向于自發(fā)地切換至結(jié)晶相。
當(dāng)前某些PCM設(shè)計(jì)和材料可以實(shí)現(xiàn)多個(gè)截然不同的水平，例如16個(gè)結(jié)晶態(tài)而非僅僅2個(gè)，每個(gè)都具有不同的電特性。這就使得單個(gè)單元可以代表多個(gè)bit，從而大大提升了存儲(chǔ)密度。

。

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專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊

PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實(shí)力庫存商家


選擇深圳長欣，選擇放心，售后無憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營：本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊”（不管能不能看懂，先了解個(gè)大概，以便學(xué)習(xí)編程時(shí)查找）；
2、由位控邏輯入手，逐漸增加定時(shí)、計(jì)數(shù)等條件，把或、與、非關(guān)系理順；
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類型轉(zhuǎn)換；
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解（最好是有個(gè)物理回路驗(yàn)證，比如變頻器+電機(jī)+測速傳感器）；
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制（盡量避免跳轉(zhuǎn)，非跳不可時(shí)也是跳的越近越好）；
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動(dòng)器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌，由于PLC的基本框架大同小異，學(xué)會(huì)一種至于其它的學(xué)習(xí)起來也就簡單了。

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