LTC4556 Smart Card Interface with Serial Control

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 VCC 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

产品特点 Features

Electrical Specifications Are ISO7816-3 and EMV Compatible
Control/Status Serial Port May be Daisy-Chained for Multicard Applications
Automatic Shutdown on Electrical Faults
Buck Boost Charge Pump Generates 5V, 3V or 1.8V Outputs (Smart Card Classes A, B and C)
Automatic Level Translation
Dynamic Pull-Ups Deliver Fast Signal Rise Times*
Supervisory Functions Prevent Smart Card Faults
Low Operating Current: 250mA Typical
VIN: 2.7V to 5.5V
Ultralow Shutdown Current
>10kV ESD on Smart Card Pins
Small 24-Pin 4mm x 4mm QFN Package

参数

应用

Handheld Payment Terminals
Pay Telephones
ATM Machines
POS Terminals
Computer Keyboards
Multiple S.A.M. Sockets

典型应用图

LTC4556 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC4556EUF	QFN	24	E	$2.68	$1.85
LTC4556EUF#PBF	QFN	24	E	$2.68	$1.85
LTC4556EUF#TR	QFN	24	E		$1.95
LTC4556EUF#TRPBF	QFN	24	E		$1.95

LTC4556 数据手册及相关资料下载

数据手册 (英文) : LTC4556 - Smart Card Interface with Serial Control.PDF
设计要点 (中文) : DN289 Single Interface Chip Controls Two Smart Cards.PDF
可靠性数据 : R415 Reliability Data .PDF