73S8024C Maxim, 73S8024C Datasheet - Page 5

• Manufacturer Part Number: 73S8024C
• Description: The 73S8024C is a single smart card interface IC, compliant to the electrical requirements of ISO 7816-3 and EMV 4
• Manufacturer: Maxim

DS_8024C_023
1.4 Microcontroller Interface
Rev. 1.3
Name
CMDVCC
5V/#V
PWRDN
CLKDIV1
CLKDIV2
OFF
RSTIN
I/OUC
AUX1UC
AUX2UC
(SO)
Pin
19
23
20
26
27
28
3
8
1
2
Description
Command V
converter to ramp the V
5 volt / 3 volt card selection: Logic one selects 5 volts for V
low selects 3 volt operation. When the part is to be used with a single card voltage,
this pin should be tied to either GND or V
pull-up resistor to default this pin high (selection of 5 V card) when unconnected.
Power Down control input (active high): When Power Down (PD) mode is
activated; all internal analog functions are disabled to place the 73S8024C in its
lowest power consumption mode. The PD mode is allowed only out of a card
session (= PWRDN high is not taken into account when CMDVCC = 0). Must be
tied to ground when the power down function is not used.
Sets the divide ratio from the XTALIN oscillator (or external clock input) to the card
clock. These pins include pull-down resistors.
Interrupt signal to the processor (active low): Multi-function indicating fault
conditions and card presence. Open drain output configuration; it includes an
internal 20 kΩ pull-up to V
Reset Input: This signal is the reset command to the card.
System controller data I/O to/from the card. Includes internal pull-up resistor to V
System controller auxiliary data I/O to/from the card. Includes internal pull-up
resistor to V
System controller auxiliary data I/O to/from the card. Includes internal pull-up
resistor to V
DD.
DD.
CC
(negative assertion): Logic low on this pin causes the DC-DC
CLKDIV1
CC
0
0
1
1
supply to the card and initiates a card activation sequence.
DD.
CLKDIV2
0
1
1
0
DD
. However, it includes a high impedance
Clock Rate
XTALIN/8
XTALIN/4
XTALIN/2
XTALIN
CC
and card interface, logic
73S8024C Data Sheet
DD.
5