电子技术有限公司芯片电路分析及仿真.doc

此文档收集于网络，如有侵权，请联系网站删除SN74LVC2T45线路设计报告报告日期:2011.9.30共 （19） 页项目负责人刘志组别1组长姓名任连峰接手日期2011.8.28接收情况新照片完成日期2011.9.30完成情况仿真完成原版工艺 Bipolar V CMOS BiCMOS BCD特征尺寸0.8um最高耐压6.5V器件总数371电路类型数字样片大小照片重复率50%数字比例100%模拟比例0器件种类取值仿真模型Nwell 电阻rnwell=5k/NMOSh06mixddct02v22.lib ttPMOSh06mixddct02v22.lib tt功能模块DIR传输方向控制模块，A到B端口电平转换模块，B到A端口电平转换模块 芯片简介The SN74LVC2T45 dual-bit dual supply bus transceiver with configurable voltage translation and 3-state outputs. This dual-bit noninverting bus transceiver uses two separate configurable power-supply rails.The A port is designed to track VCCA.VCCA accepts any supply voltage from 1.65 V to 5.5 V.The B port is designed to track VCCB.VCCB accepts any supply voltage from 1.65 V to 5.5 V.This allows for universal low-voltage bidirectional translation between any of the 1.8-V,2.5-V,3.3-V,and 5-V voltage nodes.It is designed for asynchronous communication between two data buses. The logic levels of the direction-control (DIR) input activate either the B-port outputs or A-port outputs. The device transmits data from the A bus to the B bus when the B-port outputs are activated, and from B bus to A bus when the A-port outputs are activated.The DIR input circuit is referenced to VCCA.关键性能要求Each port to operate over the full 1.65-V to 5.5-V power-supply rangeVcc isolation feature If either Vcc input is at GND,both ports are in high-impedance Low power consumption ,10uA Max icc 24-mA output drive at 3.3V Ioff Supports Partial-Power-Down Mode Operation Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II 专利说明原芯片公司是否有相关专利?1、原理框图2、应用框图3、电路功能分析：整体电路：3.1 DIR 传输方向控制模块3.1.1 模块电路图3.1.2功能分析：DIR 通过两个反相器，构成一高，一低的电平作为输入，红线和黄线作为输出，分别控A到B方向传输的开关，和B到A方向传输的开关。其中红，黄两线的输出对传输方向的控制是低电平使能。 整个模块的功能是：DirB-A（红线）A-B（黄线）00 1（VCCB）1 1（VCCA） 03.1.3仿真波形图 图中 DIR输入为高电平3.3V的pulse脉冲，VCCA=3.3V，VCCB=1.8V，第一个波形为DIR输入，红、黄线分别为对应的输出。红线高电平参考VCCA，黄线高电平参考VCCB，3.1.4 关键器件和参数无3.1.5 修改和调整情况：无3.2 A 到B端口电平转换模块3.2.1 A 端口信号电平转换电路 如上图所示，A端口的信号经过两个由VCCA供电的反相器，输入到由VCCB供电的电路中，其中第一个反相器的输出（淡黄线）控制N163的开启、断开，N163漏端输出电平与淡黄线电平相反，高电平大小决定于VCCB，再进过两个反相器后输出，使Y端的输出信号（粉红线）与A端的输入信号保持同向，且高电平大小发生改变。图中，虚线左右两部分电路相互反馈，使电路性能稳定。3.3.2 输出端电路图：3.2.3功能分析：如图，来自DIR控制模块的输入信号（黄线），该信号与DIR电平反向向（低电平使能）和来自A端口电平转换后信号（粉红线）通过一个或非门的输出（紫线）控制N133的开启和关断。同时粉红线信号，输入一个当DIR控制为A到B传输时，其功能为反相器，B到A传输时其输出为高阻的cell2。它的输出（深蓝色线）驱动P148管的开启和关断。该N133，P148 组成类反相器结构输出到B端。若B到A传输信号，上述提到的N管，P管同时截止，阻止B端口信号输入此电路，使其通过第一个图的电路输入。DIR控制信号同时控制A2端口电路的或非门，故能实现两个信号端传输方向的控制。Power down：正常工作时，电源通过二极管D6为P148衬底提供电压。断电后VCCB=0，若Y端输入高电平：P238，P237，P187导通，Y端的高电平通过P238为衬底提供高电平（红线），通过P237使P148的栅为高电平，P148截止。通过P187的导通使P122P186管的栅极为高电平，P122P186 截止。此功能可防止电流流入芯片，实现关断功能。3.2.3 仿真分析 黄线为VCCB，红线为ICCB，可以看出在VCCB降为0后，ICCB也降为0 。3.2.4 关键器件和参数无3.2.5 修改和调整情况：无3.3 B到A端口电平转换模块，与A到B端口电平转换模块电路相同，功能一致，故不做分析。4整体仿真分析 此电路实现的功能如下表格所示：该电路的功能仿真波形如下图所示：DIR为高，A data to B bus (A-B) 1.8V输入 转1.8V输出 （1.8-V1.8V)黄线为A端口信号，红线为B端口信号。1.8V-2V1.8V-:3.3V1.8V-5VDIR为低，B data to A bus （B-A) 黄线为B端口信号，红线为A端口信号。1.8V-1.8V2.5V-1.8V3.3V-1.8V5V-1.8V根据图中信号转换显示，芯片功能仿真正常。5参数的性能设计 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)From-to VccI VccO Min MaxTESTSpecUnitVCCAVCCAVCCB1.655.5VCCBVIHA1-B1 1.8 1.8 1.170.841.17V 2.5 2.81.71.191.7 3.3 3.521.602 5 5 3.52.48 B1 1.81.80.630.840.63V 2.5 2.80.71.160.7 3.3 3.50.81.540.8 5 50.542.380.54VIHDir-B1 1.8 1.8 1.170.841.17V 2.5 2.81.71.171.7 3.3 3.521.562 5 5 3.52.40 B1 1.8 1.80.630.820.63V 2.5 2.80.71.150.7 3.3 3.50.81.530.8 5 50.54 2.370.54conditionsVCCAVCCB MIN MAX TestUnitVOHIOH=-4mAVI=VIH1.651.651.21.59VIOH=-8mA2.32.31.92.2IOH=-24mA332.42.9IOH=-32mA4.54.53.84.38VOLIOL=4mAVI=VIL1.651.650.450.04VIOL=8mA2.32.30.30.06IOL=24mA330.550.15IOL=32mA4.54.50.550.16II DIRVI=VCCA or GND1.81.821.45uAIoff A VI or Vo=0 to5.50520uA B5020IozA or BVO=VCCO or GND3.33.321.18uAIccAVI=VccI or GNDIo=03.33.331.43uA5021.430520IccBVI=VccI or GNDIo=03.33.331.46uA50200521.43IccA AOne A at VCCA-0.6v;DIR=VCCAB =open55500uADIRDIR at VccA-0.6v;A=VccA or GNDB =open501.46IccB BOne B at VCCB-0.6v;DIR=GND A =open 5 5504.4uAswitching characteristics over recommended operating free-air temperature range,CL=15pF (unless otherwise noted) (see Figure 1)VCCA=1.8V Tr=2.5ns Tf=2.5ns RL=2k Cp=15pFrom to VccB=1.8VTESTvccB=2.5VTESTUnitminMaxminMaxTPLHA-B317.74.62.210.33.8ns TPHL2.814.34.32.28.53.7TPLHB-A317.74.32.3164.0TPHL2.814.35.72.112.95.4TPHZDIR-A10.630.95.910.330.55.9TPLZ7.319.77.17.519.65.7TPHZDIR-B1027.95.98.414.96.2TPLZ6.519.55.97.212.64.7TPZHDIR-A37.28.928.68.1TPZL42.28.727.87.8TPZHDIR-B37.44.729.94.7TPZL45.27.3396.0From to vccB=3.3TESTVccB=5TESTUnitminmaxminmaxTPLHA-B1.78.33.41.47.23.1nsTPHL1.87.13.51.773.4TPLHB-A2.115.53.81.915.13.8TPHL212.65.11.812.25.0TPHZDIR-A10.530.55.910.729.35.9TPLZ7.519.54.7719.44.7TPHZDIR-B6.511.36.04.18.65.0TPLZ4.39.74.92.17.13.9TPZHDIR-A25.27.722.27.4TPZL23.97.520.87.2TPZHDIR-B27.85.526.64.4TPZL37.65.436.34.9 VCCA=2.5 V tr=3ns tf=3nsFrom to VccB=1.8VTESTvccB=2.5VTESTUnitminMaxminMaxTPLHA-B2.3164.51.58.53.5nsTPHL2.112.94.01.47.53.4TPLHB-A2.210.33.51.58.53.2TPHL2.28.54.71.47.54.4TPHZDIR-A6.617.14.67.116.84.6TPLZ5.312.63.65.212.53.6TPHZDIR-B10.727.97.08.113.95.6TPLZ7.818.95.76.211.24.6TPZHDIR-A29.27.219.76.5TPZL36.47.221.46.4TPZHDIR-B28.67.0215.6TPZL306.724.35.4From to vccB=3.3TESTVccB=5TESTUnitminmaxminmaxTPLHA-B1.36.43.01.15.12.7nsTPHL1.35.43.20.94.63.0TPLHB-A1.483.017.52.9TPHL1.374.30.96.24.1TPHZDIR-A6.816.84.65.216.54.6TPLZ4.912.33.64.812.33.6TPHZDIR-B5.810.55.83.57.64.5TPLZ3.68.94.81.46.23.8TPZHDIR-A16.96.213.75.9TPZL17.56.013.85.7TPZHDIR-B18.74.917.44.3TPZL22.24.821.14.2 VCCA=3.3 V tr=4ns tf=4ns From to VccB=1.8VTESTvccB=2.5VTESTUnitminMaxminMaxTPLHA-B2.115.54.21.483.3nsTPHL212.64.01.373.3TPLHB-A1.78.33.21.36.42.8TPHL1.87.14.41.35.44.0TPHZDIR-A510.95.05.110.84.9TPLZ3.48.43.93.78.43.9TPHZDIR-B11.227.37.0813.75.6TPLZ9.417.75.85.611.34.6TPZHDIR-A266.717.75.9TPZL34.46.519.15.7TPZHDIR-B23.96.816.45.3TPZL23.56.517.85.1From to vccB=3.3TESTVccB=5TESTUnitminMaxminMaxTPLHA-B0.75.62.90.74.42.5nsTPHL0.853.00.742.8TPLHB-A0.75.82.70.65.42.6TPHL0.853.90.74.53.6TPHZDIR-A510.84.9510.44.9TPLZ3.98.13.93.37.83.9TPHZDIR-B5.810.45.92.97.44.6TPLZ4.38.34.815.63.8TPZHDIR-A14.15.5115.2TPZL15.45.411.95.1TPZHDIR-B13.94.612.24.0TPZL15.84.514.43.9 VCCA=5 V tr=5ns tf=5ns From to VccB=1.8VTESTvccB=2.5VTESTUnitminMaxminMaxTPLHA-B1.915.14.117.53.2nsTPHL1.812.23.80.96.23.1TPLHB-A1.47.22.915.12.5TPHL1.774.30.94.63.8TPHZDIR-A2.98.23.82.97.93.8TPZH1.46.93.11.36.73.1TPHZDIR-B11.226.16.87.213.95.6TPZH8.416.95.85114.6TPZHDIR-A24.16.116.15.3TPZL33.16.018.55.2sTPZHDIR-B226.614.25.1TPZL20.46.314.15.0From to vccB=3.3TESTVccB=5TESTUnitminMaxminMaxTPLHA-B0.65.42.80.53.92.4nsTPHL0.74.52.80.53.52.6TPLHB-A0.74.42.30.53.92.2TPHL0.743.70.53.53.4TPHZ