73S8024C datasheet(4/22 Pages) MAXIM

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73S8024C Data Sheet

DS_8024C_023

Rev. 1.3

Pin Description

1.1

Card Interface

Name

(SO)

Description

Card I/O: Data signal to/from card. Includes a pull-up resistor to VCC.

AUX1

AUX1: Auxiliary data signal to/from card. Includes a pull-up resistor to VCC.

AUX2

AUX2: Auxiliary data signal to/from card. Includes a pull-up resistor to VCC.

RST

Card reset: provides reset (RST) signal to card.

CLK

Card clock: provides clock (CLK) signal to card. The rate of this clock is

determined by crystal oscillator frequency and CLKDIV selections.

PRES

Card Presence switch: active high indicates card is present. Includes a pull-

down current source.

PRES

Card Presence switch: active low indicates card is present. Includes a pull-up

current source.

VCC

Card power supply: logically controlled by the sequencer, output of DC-DC

converter. Requires an external filter capacitor to the card GND.

GND

Card ground.

1.2

Miscellaneous Inputs and Outputs

Name

(SO)

Description

XTALIN

Crystal oscillator input: can either be connected to crystal or driven as a source

for the card clock.

XTALOUT

Crystal oscillator output: connected to crystal. Left open if XTALIN is being

used as an external clock input.

VDDF_ADJ

VDD fault threshold adjustment input: this pin can be used to adjust the VDDF

value (that controls deactivation of the card). Must be left open if unused.

Non-connected pin.

1.3

Power supply and ground

Name

(SO)

Description

VDD

6, 21

System controller interface supply voltage, supply voltage for internal power

supply and DC-DC converter power supply source.

GND

DC-DC converter ground.

GND

Digital ground.

LIN

External inductor. Connect external inductor from pin 5 to VDD. Keep the

inductor close to pin 5.

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