73S8014R Data Sheet
DS_8014R_012
Table 1: 73S8014R 20-Pin SOP Pin Definitions
Pin Name
Pin
Number Type
Equivalent
Circuit
Description
Card Interface
I/O
RST
CLK
14
15
17
IO
O
O
Card I/O: Data signal to/from card. Includes an 11k pull-up
resistor to V
CC.
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.
Command VCC (negative assertion): Logic low on this pin causes
the LDO regulator to ramp the V
CC
supply to the card and initiates
a card activation sequence, if a card is present.
5 volt / 3 volt card selection: Logic one selects 5 volts for V
CC
and
card interface, logic 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
DD
. However, it includes a high impedance pull-up
resistor to default this pin high (selection of 5V card) when not
connected. This pin shall not be changed when CMDVCC is low.
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.
CLKDIV1
CLKDIV2
20
5
I
CLKDIV1
0
0
1
1
OFF
RSTIN
I/OUC
1
2
3
O
I
IO
CLKDIV2
0
1
1
0
CLOCK RATE
XTALIN/8
XTALIN/4
XTALIN/2
XTALIN
PRES
VCC
GND
19
18
16
I
PSO
GND
–
Host Processor Interface
CMDVCC
6
I
5V/#V
7
I
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
DD.
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
DD.
6
Rev. 1.0
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
