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73S8024RN-IL/F датащи(PDF) 11 Page - Maxim Integrated Products

номер детали 73S8024RN-IL/F
подробное описание детали  Low-Cost Smart Card Interface
PDF  27 Pages
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производитель  MAXIM [Maxim Integrated Products]
домашняя страница  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

73S8024RN-IL/F датащи(HTML) 11 Page - Maxim Integrated Products

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DS_8024RN_020
73S8024RN Data Sheet
Rev. 2
11
The following steps show the activation sequence and the timing of the card control signals when the
system controller pulls the CMDVCC low while the RSTIN is high:
CMDVCC
is set low.
Next, the internal VCC control circuit checks the presence of VCC at the end of t1. In normal operation,
the voltage VCC to the card becomes valid during this time. If not, OFF goes low to report a fault to
the system controller, and the power VCC to the card is shut down.
Due to the fall of RSTIN at (t2), turn I/O (AUX1, AUX2) to reception mode.
CLK is applied to the card at the end of (t3), after I/O is in reception mode.
RST is to be a copy of RSTIN after (t4). RSTIN may be set high before t4, however the sequencer will
not set RST high until 42000 clock cycles after the start of CLK.
CMDVCC
VCC
I/O
CLK
RSTIN
t1
t2 t3
t4
RST
t1 = 0.510 ms (timing by 1.5MHz internal Oscillator)
t2 = 1.5µs, I/O goes to reception state
t3 = > 0.5µs, CLK active
t4 ≥ 42000 card clock cycles. Time for RST to become the copy of RSTIN
Figure 3: Activation Sequence – RSTIN High When CMDVCCB Goes Low



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