73S8009CN 查看數據表（PDF） - Teridian Semiconductor Corporation

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73S8009CN

Combo ISO-7816 and USB Universal Smart Card Interface IC

Teridian Semiconductor Corporation 

DS_8009CN_026

73S8009CN Data Sheet

3.8 Chip Selection

The CS pin allows multiple circuits to operate in parallel, driven from the same host control bus. When

CS is high, the pins RSTIN, CMDVCC%, CMDVCC# and CLKIN control the chip as described. The pins

I/OUC, AUX1UC, and AUX2UC have 11kΩ pull-up resistors and operate to transfer data to the smart card

via I/O, AUX1, and AUX2 when the smart card is activated. The signals OFF and RDY have 20kΩ pull-up

resistors.

When CS goes low, the states of the pins RSTIN, CMDVCC%, CMDVCC, and CLKIN are latched and held

internally. The pull-up for pins I/OUC, AUX1UC, and AUX2UC become a very weak pull-up of

approximately 3 microamperes. No transfer of data is possible between I/OUC, AUX1UC, AUX2UC and

the smart-card signals I/O, AUX1, and AUX2. The signals OFF and RDY are set to high impedance and

the internal pull-up resistors of 20kΩ are disconnected. With regard to de-activation, CS does not affect

the operation of the fault sensing circuits and card sense input. CS does not affect the action of SC/USB.

CS

OFF, I/OUC,

AUX1UC, AUX2UC

tSL

HI-Z STATE

tDZ

FUNCTIONAL

HI-Z STATE

CONTROL SIGNALS

tIS

tSI

tID

tDI

Figure 8: CS Timing Definitions

Rev. 1.4

21

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