73S8009CN View Datasheet(PDF) - Teridian Semiconductor Corporation

Part Name

Description

Manufacturer

73S8009CN

Combo ISO-7816 and USB Universal Smart Card Interface IC

Teridian Semiconductor Corporation 

73S8009CN Data Sheet

DS_8009CN_026

3.9 I/O Circuitry and Timing

The states of the I/O, AUX1, and AUX2 pins are low after power on reset and they are in high when the

activation sequencer turns on the I/O reception state. See the Activation and De-activation Sequence

section for more details on when the I/O reception is enabled. The states of I/OUC, AUX1UC, and

AUX2UC are high after power on reset.

Within a card session and when the I/O reception state is turned on, the first I/O line on which a falling

edge is detected becomes the input I/O line and the other becomes the output I/O line. When the input

I/O line rising edge is detected, then both I/O lines return to their neutral state. Figure 6 shows the state

diagram of how the I/O and I/OUC lines are managed to become input or output.

Neutral

State

No

I/O

reception

Yes

I/O

&

not I/OUC

No

Yes

No

I/OUC

&

not I/O

Yes

I/OUC

in

I/OICC

in

No

No

I/OUC

I/O

yes

yes

Figure 9: I/O and I/OUC State Diagram

22

Rev. 1.4

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