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73S8004R-ILF 参数 Datasheet PDF下载

73S8004R-ILF图片预览
型号: 73S8004R-ILF
PDF下载: 下载PDF文件 查看货源
内容描述: [Microprocessor Circuit, PDSO28,]
分类和应用: 光电二极管外围集成电路
文件页数/大小: 18 页 / 298 K
品牌: TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
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73S8004R  
Low Cost Smart Card Interface  
POWER SUPPLY  
The TDK 73S8004R smart card interface IC incorporates a LDO voltage regulator. The voltage output is  
controlled by the digital input 5V/#V. This regulator is able to provide either 3V or 5V card voltage from the power  
supply applied on the VPC pin. Three voltage supervisors constantly check the presence of the voltages VDD, VPC  
and VCC. A card deactivation sequence is forced upon fault of any of these voltage supervisors. The two voltage  
supervisors for VPC and VCC are linked so that a fault is generated to activate a deactivation sequence when the  
voltage VPC becomes lower than VCC. It allows the 73S8004R to operate at lower VPC voltage when using 3V  
cards only.  
The voltage regulator can provide a current of at least 65mA on VCC to comply with EMV 4.0 specification. The  
VPC voltage supervisor threshold values are also defined from the EMV 4.0 specification. Digital circuitry is  
powered by the power supply applied on the VDD pin. VDD also defines the voltage range to interface with the  
system controller. A third voltage supervisor monitors the VDD voltage. It is used to initialize the ISO-7816-3  
sequencer at power-on, and to deactivate the card at power-off or upon fault. The voltage threshold of the VDD  
voltage supervisor is internally set by default to 2.3V nominal. However, it may be desirable, in some applications,  
to modify this threshold value. The pin VDDF_ADJ (pin 18 in the SO package, pin 17 in the MLF package) is used  
to connect an external resistor REXT to ground to raise the VDD fault voltage to another value VDDF. The resistor  
value is defined as follows:  
R
EXT= 56k/(VDDF - 2.33)  
When this capability is not used, the VDDF_ADJ must be left open.  
CARD POWER SUPPLY  
The card power supply is internally provided by the LDO regulator, and controlled by the digital ISO-7816-3  
sequencer. Card voltage selection is carried out by the digital input 5V/#V.  
Depending on the applications, the requirements in terms of both VCC minimum voltage and transient currents that  
the interface must be able to provide to the card are different. An external capacitor must be connected between  
the VCC pin and to the card ground in order to guarantee stability of the LDO regulator, and to handle the  
transient requirements. The type and value of this capacitor can be optimized to meet the desired specification.  
The table below shows the recommended capacitors for each VPC power supply configuration and applicable  
specification.  
Specification Requirement  
Application  
Max  
Min VCC Voltage allowed  
During transient current  
Min VPC Power  
Supply  
transient  
current  
charge  
Specification  
Capacitor Type  
Capacitor Value  
required  
X7R  
w/  
EMV 4.0  
ISO-7816-3  
4.6V  
4.5V  
30nA.s  
4.75V  
4.75V  
3.3 µF  
1 µF  
20nA.s  
ESR < 100mΩ  
Table 1: Choice of VCC pin capacitor  
Page 5  
© 2002-2003 TDK Semiconductor Corporation  
Proprietary and Confidential  
Rev 1.1