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发表于 2010-11-13 08:47:49
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![](http://cache.amobbs.com/bbs_upload782111/files_34/ourdev_597586JZY1EM.JPG)
(原文件名:LOGIC.JPG)
5 V tolerant inputs/outputs for interfacing with 5 V logic
Wide supply voltage range:
3 V port (VCCA): 1.5 V to 3.6 V
5 V port (VCCB): 1.5 V to 5.5 V.
CMOS low power consumption
Direct interface with TTL levels
Control inputs voltage range from 2.7 V to 5.5 V
Inputs accept voltages up to 5.5 V
High-impedance outputs when VCCA or VCCB = 0 V
Complies with JEDEC standard JESD8-B/JESD36
ESD protection:
HBM EIA/JESD22-A114-B exceeds 2000 V
MM EIA/JESD22-A115-A exceeds 200 V.
Specified from -40 °C to +85 °C and -40 °C to +125 °C.
按LZ的接法,pin.1和pin.48 多接地,那就是 1An<=1Bn
pin.24=5V,pin.25=GND, 那就是 2An=>2Bn
慢慢摸索把,可能是假货坏片,你手里如果还有片子就换下试试吧,也检查下焊接等的问题
现在无良的JS很多 |
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