SN74HC257DR 鏅傞枔锛�2025/5/12 16:19:09 闁辫畝锛�23

SN74HC257DR 鏄竴娆句締鑷痉宸炲剙鍣� (TI) 鐨勯珮閫� CMOS 3-8 绶氳纰煎櫒/瑙ｇ⒓鍣�锛岄噰鐢� HC (High-speed CMOS) 宸ヨ棟鍒堕€犮€傝┎鍣ㄤ欢鑳藉鍦ㄤ綆鍔熻€楃殑鎯呮硜涓嬫彁渚涜純楂樼殑閫熷害鎬ц兘锛屽苟涓斿叿鏈夐珮鍣伈瀹归檺锛屽吋瀹� TTL 杓稿嚭闆诲钩銆�
銆€銆€瑭茶姱鐗囧寘鍚竴鍊� 3 杓稿叆鍦板潃璀⒓鍣ㄥ拰 8 鍊嬩簰鏂ョ殑杓稿嚭閫氶亾銆傞€氶亷杓稿叆鐨� 3 浣嶄簩閫�(j矛n)鍒跺湴鍧€淇¤櫉锛圓0銆丄1 鍜� A2锛�锛屽彲浠ユ縺娲诲叾涓竴鍊嬪皪鎳�(y墨ng)鐨勮几鍑虹锛圷0 鑷� Y7锛夈€傛湭閬镐腑鐨勮几鍑哄皣淇濇寔楂橀浕骞崇媭鎱�(t脿i)銆傛澶�锛孲N74HC257DR 鎻愪緵浜嗕竴鍊嬩娇鑳藉紩鑵筹紙G锛�锛岀敤浜庡暉鐢ㄦ垨绂佺敤鏁村€嬪櫒浠剁殑鍔熻兘銆�

鍙冩暩(sh霉)

閭忚集椤炲瀷锛�3-8 绶氳纰煎櫒/瑙ｇ⒓鍣�
銆€銆€灏佽椤炲瀷锛欴灏佽 (SOIC)
銆€銆€宸ヤ綔闆诲鑼冨湇锛�2V 鑷� 6V
銆€銆€鍌虫挱寤堕伈鏅傞枔锛氭渶澶� 13ns (鍏稿瀷鍊�)
銆€銆€宸ヤ綔婧害鑼冨湇锛�-40掳C 鑷� +125掳C
銆€銆€闈滄厠(t脿i)闆绘祦锛氭渶澶� 1渭A锛堝湪 Vcc = 4.5V 涓嬶級
銆€銆€杓稿嚭椹�(q奴)鍕曡兘鍔涳細卤25mA
銆€銆€鍣伈瀹归檺锛氣墺 0.6V (楂橀浕骞�), 鈮� -0.4V (浣庨浕骞�)
銆€銆€Ioff 鏀寔锛氭敮鎸�
銆€銆€闆绘簮闆绘祦锛氭渶澶� 20渭A

鐗规€�

SN74HC257DR 鍏锋湁浠ヤ笅椤憲鐗规€э細
銆€銆€1. 楂橀€熸€ц兘锛氬叾鍌虫挱寤堕伈鏅傞枔鍍呯偤 13ns锛岄仼鍚堥渶瑕佸揩閫熼熆鎳�(y墨ng)鐨勬噳(y墨ng)鐢ㄥ牬鏅€�
銆€銆€2. 瀵伐浣滈浕澹撹寖鍦嶏細鏀寔寰� 2V 鍒� 6V 鐨勫闆诲鑼冨湇锛岄仼鐢ㄤ簬澶氱ó闆绘簮鐠�(hu谩n)澧冦€�
銆€銆€3. 浣庡姛鑰楄ō(sh猫)瑷堬細闈滄厠(t脿i)闆绘祦灏忎簬 1渭A锛屽湪渚挎敎寮忚ō(sh猫)鍌欎腑鑳藉鏈夋晥寤堕暦闆绘睜澹藉懡銆�
銆€銆€4. 楂樺櫔鑱插闄愶細绗﹀悎杌嶇敤妯�(bi膩o)婧�(zh菙n) MIL-M-38510/429锛岀⒑淇濆湪鎯″姡鐠�(hu谩n)澧冧笅鍙潬閬�(y霉n)琛�銆�
銆€銆€5. Ioff 鍔熻兘锛氱暥(d膩ng)杓稿嚭闂�(gu膩n)闁夋檪锛孖off 鍔熻兘鍙槻姝㈢附绶氱埈鐢�锛屼繚璀�(h霉)鏁�(sh霉)鎿�(j霉)瀹屾暣鎬у拰纭欢瀹夊叏銆�
銆€銆€6. ESD 淇濊(h霉)锛氬収(n猫i)缃潨闆绘斁闆讳繚璀�(h霉)闆昏矾锛屽寮�(qi谩ng)鍣ㄤ欢鐨勯妫掓€�銆�
銆€銆€7. 鑸� TTL 鍏煎锛氳几鍑洪浕骞冲彲浠ョ洿鎺ヨ垏 TTL 鍣ㄤ欢閫ｆ帴锛岀啊鍖栫郴绲�(t菕ng)瑷�(sh猫)瑷堛€�

鎳�(y墨ng)鐢�

SN74HC257DR 寤ｆ硾鎳�(y墨ng)鐢ㄤ簬鍚勭ó鏁�(sh霉)瀛楅浕璺腑锛屽挨鍏堕仼鐢ㄤ簬闇€瑕佸璺伕鎿囧姛鑳界殑鍫存櫙銆傚叾鍏稿瀷鎳�(y墨ng)鐢ㄥ寘鎷細
銆€銆€1. 鍦板潃璀⒓锛氱敤浜庡井铏曠悊鍣ㄧ郴绲�(t菕ng)鐨勫瓨鍎插櫒鎿�(ku貌)灞�锛屽皣鍦板潃淇¤櫉杞�(zhu菐n)鎻涚偤鐗瑰畾鐨勭墖閬镐俊铏熴€�
銆€銆€2. 澶氳矾寰�(f霉)鐢�/瑙ｅ京(f霉)鐢細瀵︾従(xi脿n)澶氳矾杓稿叆/杓稿嚭鐨勯伕鎿囧拰鍒囨彌銆�
銆€銆€3. 鎺у埗閭忚集锛氬湪宸ユキ(y猫)鎺у埗銆佹秷璨�(f猫i)椤為浕瀛愬拰鍏朵粬宓屽叆寮忕郴绲�(t菕ng)涓彁渚涚簿纰虹殑閭忚集鎺у埗銆�
銆€銆€4. 椤ず椹�(q奴)鍕曪細閰嶅悎鍏朵粬鑺墖锛岀敤浜� LED 鎴� LCD 椤ず灞忕殑娈电⒓椹�(q奴)鍕�銆�
銆€銆€5. 鏁�(sh霉)鎿�(j霉)閫氫俊锛氬湪鏁�(sh霉)鎿�(j霉)鍌宠几閬庣▼涓€�(j矛n)琛岄€氶亾閬告搰鍜屼俊铏熻矾鐢便€�