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| TI IP机顶盒解决方案(3) | |||||
作者：61IC 文章来源：本站原创 点击数： 更新时间：2007-1-18  |
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The PCF8574 and PCF8574A are two-wire I2C bus™ to 8-bit parallel bus I/O expanders from TI’s I2C logic portfolio. They are designed to provide a simple and cost-effective method to monitor and control several peripheral signals. The difference between the PCF8574 and PCF8574A is the I2C address. Key Features • Pin-to-pin compatible and functionally equivalent with competitive offerings. These are offered in a variety of packages including: 20-pin TVSOP (23% smaller than 20-pin TSSOP) 20-pin QFN package (62% smaller than 20-pin TSSOP); industry’s smallest PCF8574 and PCF8574A package Two-wire I2C bus to eight-bit bidirectional parallel-bus expander Operating supply voltage from 2.5-V to 6-V VCC Low standby current consumption of 10 mA maximum (FSCL = 0 Hz) Open-drain interrupt output to signal a change on an I/O pin Latched outputs with high-current drive capability for driving LEDs • Addressed by three hardware-address pins Applications Fan control LED drivers System monitoring Temperature sensor monitoring Push button monitoring Eight-bit bidirectional  PCF8574/A功能方框图  The TS5A23157 is a dual single-pole, double-throw (SPDT) analog switch designed for 1.65- to 5.5-V VCC operation. The TS5A23157 can handle both analog and digital signals and permits signals with amplitudes of up to 5.5 V (peak) to be transmitted in either direction without clipping. Analog switches in the TS switch product family provide lowpower consumption and high speed while maintaining exceptional signal integrity. Typical applications include analog signal routing, signal gating, chopping and digital signal multiplexing/demultiplexing. Key Features Passes both analog and digital signals Specified break-before-make switching Low-charge injection Excellent on-resistance matching Low total harmonic distortion 1.8- to 5.5-V single-supply operation Bidirectional data flow with near-zero propagation delay Benefits Optimizes circuit routing on densely populated PCBs Low-power consumption (10 μA at 1.95 V) supports portable applications Supports both digital and analog applications Low input/output capacitance minimizes loading and signal distortion TS5A23157DGSR offers space-saving, low-profile TSSOP (MSOP-10) package 
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| TI IP网络摄像机解决方案 TI IP机顶盒解决方案(1) TI IP机顶盒解决方案(2) TI IP机顶盒解决方案(4) |
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