厂商：Freescale
类别：16位单片机
厂商：Murata
类别：抗氧体磁珠和芯片
厂商：Littelfuse
类别：保险丝座及配件
厂商：Linear
类别：高速放大器
厂商：Panasonic
类别：PhotoMOS(MOSFET输出光电耦合器)
厂商：Yageo
类别：铝电解电容
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特点Electrical Specifications Are ISO7816-3 and EMV CompatibleControl/Status Serial Port May be Daisy-Chained for Multicard ApplicationsAutomatic Shutdown on Electrical FaultsBuck Boost Charge Pump Generates 5V, 3V or 1.8V Outputs (Smart Card Classes A, B and C)Automatic Level TranslationDynamic Pull-Ups Deliver Fast Signal Rise Times*Supervisory Functions Prevent Smart Card FaultsLow Operating Current: 250mA Typical V IN : 2.7V to 5.5V Ultralow Shutdown Current>10kV ESD on Smart Card PinsSmall 24-Pin 4mm x? 4mm QFN Package典型应用典型应用描述The LTC?4556 provides all necessary power control, level translation and supervisory functions for a smart card or S.A.M. card interface. The part contains a low noise charge pump** plus LDO for generating V CC power, as well as all necessary level shifting circuitry.The card voltage can be set to either 1.8V, 3V or 5V. The LTC4556 includes a card detection channel with automatic debounce circuitry. To reduce wiring costs, the LTC4556 interfaces to a microcontroller via a simple 4-wire serial interface. Multiple devices may be connected in daisychain fashion so that the number of wires to the card socket board is independent of the number of sockets. Status data is returned over the same interface.Extensive security features ensure proper deactivation sequencing in the event of a supply fault or a smart card electrical fault. The smart card pins can withstand greater than 10kV ESD in-situ with no additional components. The LTC4556 is available in a small, low profile (0.75mm), 4mm x 4mm QFN package.*U.S. Patent No. 6,356,140 **U.S. Patent No. 6,411,531