73S8014RT TERIDIAN [Teridian Semiconductor Corporation], 73S8014RT Datasheet - Page 6

• Manufacturer Part Number: 73S8014RT
• Description: Smart Card Interface
• Manufacturer: TERIDIAN [Teridian Semiconductor Corporation]

Card Interface
I/O
RST
CLK
PRES
VCC
GND
Host Processor Interface
CMDVCC%
CMDVCC#
CLKDIV1
CLKDIV2
OFF
RSTIN
I/OUC
Table 1 provides the 73S8014RT pin names, pin numbers, type, equivalent circuits and descriptions.
6
Pin Name
Pin
Number Type
19
14
15
17
18
16
20
6
7
5
1
2
3
GND
PSO
IO
IO
O
O
O
I
I
I
I
I
Table 1: 73S8014RT 20-Pin SOP Pin Definitions
Equivalent
Figure 14
Figure 13
Figure 12
Figure 16
Figure 11
Figure 16
Figure 16
Figure 16
Figure 10
Figure 16
Figure 15
Circuit
–
Card I/O: Data signal to/from card. Includes an 11K pull-up
resistor to V
Card reset: provides reset (RST) signal to card.
Card clock: provides clock signal (CLK) to card. The rate of this
clock is determined by the external crystal frequency or
frequency of the external clock signal applied on XTALIN and
CLKDIV selections.
Card Presence switch: active high indicates card is present.
Includes a high-impedance pull-down current source.
Card power supply – logically controlled by sequencer, output of
LDO regulator. Requires an external filter capacitor to the card
GND.
Card ground.
Logic low on one or both of these pins will cause the LDO
regulator to ramp the Vcc supply to the smart card and smart
card interface to the value described in the following table:
Note: See
Sets the divide ratio from the XTAL oscillator (or external clock
input) to the card clock. These pins include a pull-up resistor for
CLKDIV1 and CLKLDIV2 to provide a default rate of divide by
two.
Interrupt signal to the processor. Active Low – Multi-function
indicating fault conditions and card presence. Open drain output
configuration. It includes an internal 20kΩ 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 an 11K
pull-up resistor to V
CMDVCC%
CLKDIV1
0
0
1
1
0
0
1
1
Section 3.2
CC.
DD.
for more details.
CMDVCC#
Description
CLKDIV2
0
1
0
1
0
1
1
0
Vcc Output Voltage
CLOCK RATE
Vcc Off
XTALIN/6
XTALIN/4
XTALIN/2
XTALIN
1.8V
5.0V
3.0V
DD.
Rev. 1.0