X9C303
®
Logarithmic Digitally Controlled Potentiometer (XDCP™)
Data Sheet
January 24, 2007
FN8223.1
Terminal Voltage ±5V, 100 Taps, Log Taper
Description
The Intersil X9C303 is a digitally controlled potentiometer
(XDCP). The device consists of a resistor array, wiper
switches, a control section, and nonvolatile memory. The
wiper position is controlled by a three-wire interface.
Features
• Solid-state potentiometer
• Three-wire serial interface
• 100 wiper tap points
- Wiper position stored in nonvolatile memory and
recalled on power-up
• 99 resistive elements, log taper
- Temperature compensated
- End to end resistance, 32kΩ ±15%
- Terminal voltages, ±5V
The resistor array is composed of 99 resistive elements.
Between each element and at either end are tap points
accessible to the wiper terminal. 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 nonvolatile memory
and then be recalled upon a subsequent power-up
operation.
• Low power CMOS
- VCC = 5V
- Active current, 3mA max.
- Standby current, 750µA max.
The device can be used as a three-terminal potentio-meter
or as a two-terminal variable resistor in a wide variety of
applications ranging from control, to signal processing, to
• High reliability
- Endurance, 100,000 data changes per bit
- Register data retention, 100 years
parameter adjustment. Digitally-controlled potentiometers
provide three powerful application advantages; (1) the
variability and reliability of a solid-state potentiometer, (2) the
flexibility of computer-based digital controls, and (3) the use
of nonvolatile memory for potentiometer settings retention.
• Packages
- 8 Ld TSSOP
- 8 Ld SOIC
- 8 Ld PDIP
Block Diagram
U/D
INC
CS
7-Bit
Up/Down
Counter
99
98
97
96
RH/VH
7-Bit
Nonvolatile
Memory
One
of
One-
Resistor
Transfer
Hundred
Decoder
Array
Gates
2
1
0
Store and
Recall
Control
Circuitry
VCC
VSS
RL/VL
RW/VW
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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