X9312

1

©Xicor, Inc. 1994, 1995 Patents Pending

Characteristics subject to change without notice

3865-2.4 12/1/95 T1/C0/D0 NS

DESCRIPTION

The Xicor X9312 is a solid state nonvolatile potentiom-

eter and is ideal for digitally controlled resistance trim-

ming.

The X9312 is a resistor array composed of 99 resistive

elements. Between each element and at either end are

tap points accessible to the wiper element. The position of

the wiper element is controlled by the

CS, U/D, and INC

inputs. The position of the wiper can be stored in nonvola-

tile memory and then be recalled upon a subsequent

power-up operation.

The resolution of the X9312 is equal to the maximum

resistance value divided by 99. As an example, for the

X9312U (50K

Ω) each tap point represents 505Ω.

All Xicor nonvolatile memories are designed and tested

for applications requiring extended endurance and data

retention.

FEATURES

—Active Current, 3mA Max

—Standby Current, 1mA Max

—Temperature Compensated

—

— 0 to +15V Range

—Wiper Positioned via Three-Wire Interface

—Similar to TTL Up/Down Counter

—Wiper Position Stored in Nonvolatile

Memory and Recalled on Power-Up

Ω

Ω

Ω

Ω

FUNCTIONAL DIAGRAM

7-BIT

UP/DOWN

COUNTER

7-BIT

NONVOLATILE

MEMORY

STORE AND

RECALL

CONTROL

CIRCUITRY

ONE

OF

ONE-

HUNDRED

DECODER

RESISTOR

ARRAY

99

98

97

96

2

1

0

VL

VW

VH

U/D

INC

CS

VCC

GND

TRANSFER

GATES

3865 FHD F01

X9312

Terminal Voltage 0V to +15V, 100 Taps

A V AILABLE

AN42 • AN44–48 • AN50 • AN52 • AN53 • AN71 • AN73