APPLICATION NOTES
A V A I L A B L E
AN42 • AN44–48 • AN50 • AN52 • AN53 • AN71 • AN73
TXe9r3m12inal Voltage 0V to +15V, 100 Taps
X9312
E2POT™ Nonvolatile Digital Potentiometer
FEATURES
DESCRIPTION
• Compatible with X9C102/103/104/503
• Low Power CMOS
The Xicor X9312 is a solid state nonvolatile potentiom-
eter and is ideal for digitally controlled resistance trim-
ming.
—Active Current, 3mA Max
—Standby Current, 1mA Max
• 99 Resistive Elements
The X9312 is a resistor array composed of 99 resistive
elements. Between each element and at either end are
tappointsaccessibletothewiperelement. Thepositionof
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.
—Temperature Compensated
—±20% End to End Resistance Range
— 0 to +15V Range
• 100 Wiper Tap Points
—Wiper Positioned via Three-Wire Interface
—Similar to TTL Up/Down Counter
—Wiper Position Stored in Nonvolatile
Memory and Recalled on Power-Up
• 100 Year Wiper Position Data Retention
• X9312Z = 1KΩ
The resolution of the X9312 is equal to the maximum
resistance value divided by 99. As an example, for the
X9312U (50KΩ) each tap point represents 505Ω.
All Xicor nonvolatile memories are designed and tested
for applications requiring extended endurance and data
retention.
• X9312W = 10KΩ
• X9312U = 50KΩ
• X9312T = 100KΩ
FUNCTIONAL DIAGRAM
U/D
INC
CS
7-BIT
UP/DOWN
COUNTER
99
V
H
98
97
96
7-BIT
NONVOLATILE
MEMORY
ONE
OF
ONE-
HUNDRED
DECODER
TRANSFER
GATES
RESISTOR
ARRAY
2
1
0
STORE AND
RECALL
CONTROL
CIRCUITRY
V
CC
GND
V
V
L
W
3865 FHD F01
E2POT™ is a trademark of Xicor, Inc.
©Xicor, Inc. 1994, 1995 Patents Pending
3865-2.4 12/1/95 T1/C0/D0 NS
Characteristics subject to change without notice
1
XICOR [ XICOR INC. ]
