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FN8222.1

September 19, 2005

PIN DESCRIPTIONS

Pin

Symbol

Brief Description

1INC

Increment . The INC input is negative-edge triggered. Toggling INC will move the wiper and either

increment or decrement the counter in the direction indicated by the logic level on the U/D input.

2U/D

Up/Down. The U/D input controls the direction of the wiper movement and whether the counter

is incremented or decremented.

terminals of a mechanical potentiometer. The minimum voltage is -5V and the maximum is +5V.

L

/R

L

references the relative position of the terminal in

relation to wiper movement direction selected by the U/D input and not the voltage potential on

the terminal.

4

5

potentiometer. The position of the wiper within the array is determined by the control inputs. The

wiper terminal series resistance is typically 40

Ω.

6

L

/R

L

) terminals of the X9C102/103/104/503 are equivalent to the fixed

terminals of a mechanical potentiometer. The minimum voltage is -5V and the maximum is +5V.

L

/R

L

references the relative position of the terminal in

relation to wiper movement direction selected by the U/D input and not the voltage potential on

the terminal.

7CS

CS. The device is selected when the CS input is LOW. The current counter value is stored in

nonvolatile memory when CS is returned HIGH while the INC input is also HIGH. After the store op-

eration is complete the X9C102/103/104/503 device will be placed in the low power standby mode

until the device is selected once again.

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X9C102, X9C103, X9C104, X9C503