PCA9539DWR 接口-I/O扩展器
规格信息：
制造商:Texas Instruments
产品种类:接口-I/O扩展器
RoHS:是
输入/输出端数量:16 I/O
接口类型:I2C, Serial, SMBus
最大时钟频率:400 kHz
中断输出:With Interrupt
工作电源电压:2.3 V to 5.5 V
最小工作温度:- 40 C
最大工作温度:+ 85 C
安装风格:SMD/SMT
封装 / 箱体:SOIC-24
封装:Cut Tape
封装:MouseReel
封装:Reel
特点:Configuration Registers, Interrupt Pin, Reset Pin
输出电流:25 mA
产品:I/O Expanders
系列:PCA9539
类型:I/O Expander
商标:Texas Instruments
逻辑系列:PCA9539
工作电源电流:100 uA
产品类型:I/O Expanders
工厂包装数量:2000
子类别:Interface ICs
单位重量:624.400 mg
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消防泵的类型并不是固定的，但是市面上绝大多数消防泵是离心泵。 离心泵只是按泵的结构来分的，而消防泵是按泵的用途来分的，道理上讲非离心泵也是可以做消防泵的。
那消防泵和离心泵的区别在哪呢？
消防泵和离心泵的区别在于，消防泵属于需要进行强制认证的消防产品，需要特殊的资质才能生产销售。 另外，消防泵较一般的清水泵其流量扬程曲线较为平坦，扬程随流星的变化不明显，流量变化后，扬程也可以保证。稳定性和安全可靠性也比较高。
而离心泵是指靠叶轮旋转产生的离心力来输送液体的泵。 离心泵和消防泵虽然都是属于离心泵的范畴，但是它们的应用场景不同。
