intersil X9314 DATA SHEET

www.BDTIC.com/Intersil

X9314

Terminal Voltages ±5V, 32 Taps, Log Taper

Data Sheet September 5, 2006

Single Digitally Controlled Potentiometer (XDCP™)

The Intersil X9314 is a solid state nonvolatile potentiometer and is ideal for digitally controlled resistance trimming.

The X9314 is a resistor array composed of 31 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 nonvolatile memory and then be recalled upon a subsequent power-up operation.

The XDCP can be used as a three-terminal potentiometer or as a two-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing.

Block Diagram

U/D INC

5-Bit

Up/Down

Counter

FN8178.2

Features

• Solid State Potentiometer

•32 Taps

•10kΩ End to End Resistance

• Three-Wire Up/Down Serial Interface

• Wiper Resistance, 40Ω Typical

• Nonvolatile Storage and Recall on Power-up of Wiper Position Standby Current < 500µA Max (Total Package)

•VCC = 3V to 5.5V Operation

• 100 Year Data Retention

• Offered in 8 Ld MSOP, SOIC and PDIP Packages

• Pb-Free Plus Anneal Available (RoHS Compliant)

VH/R

One

Transfer

Gates

Resistor

Array

L/RL

VW/R

5-Bit

Nonvolatile

Memory

Thirty-Two

Decoder

Store and

Recall

Control

Circuitry

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.

All other trademarks mentioned are the property of their respective owners.

Ordering Information

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X9314

RANGE

PART NUMBER PART MARKING

X9314WMI* 14WI 5 ±10% 10 -40 to +85 8 Ld MSOP M8.118 X9314WP X9314WP 0 to +70 8 Ld PDIP MDP0031 X9314WPI X9314WP I -40 to +85 8 Ld PDIP MDP0031 X9314WS* X9314W 0 to +70 8 Ld SOIC M8.15 X9314WSI* X9314W I -40 to +85 8 Ld SOIC M8.15 X9314WSIZ (Note) X9314W ZI -40 to +85 8 Ld SOIC (Pb-free) M8.15 X9314WSZ* (Note) X9314W Z 0 to +70 8 Ld SOIC (Pb-free) M8.15 X9314WMI-3* AAY 3 to 5.5 -40 to +85 8 Ld MSOP M8.118 X9314WMIZ-3* (Note) DEX -40 to +85 8 Ld MSOP (Pb-free) M8.118 X9314WS-3* X9314W D 0 to +70 8 Ld SOIC M8.15 X9314WSZ-3* (Note) X9314W ZD 0 to +70 8 Ld SOIC (Pb-free) M8.15

*Add "T1" suffix for tape and reel. NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate

termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

(V)

Pin Descriptions

VH/RH and VL/R

The high (V

) and low (VL/RL) terminals of the X9314

H/RH

TOTAL

(kΩ)

Pin Configuration

are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is –5V and the maximum is +5V. It should be noted that the terminology of V

and VH/RH references the relative position of the

L/RL

terminal in relation to wiper movement direction selected by the U/D

VW/R

input and not the voltage potential on the terminal.

is the wiper terminal, equivalent to the movable

W/RW

terminal of a mechanical potentiometer. The position of the wiper within the array is determined by the control inputs. The wiper terminal series resistance is typically 40Ω.

TEMP RANGE

(°C) PACKAGE

8 LD PDIP/SOIC

INC

U/D

VH/R

VW/R

VL/R

X9314

8 LD MSOP

X9314

PKG.

DWG. #

L/RL

W/RW

U/D

INC

Up/Down (U/D)

The U/D input controls the direction of the wiper movement and whether the counter is incremented or decremented.

Increment (INC)

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.

Chip Select (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 operation is complete the X9314 will be placed in the low power standby mode until the device is selected once again.

Pin Names

SYMBOL DESCRIPTION

W/RW

VL/R

V V

H/RH

L SS CC

U/D INC Increment Input

CS Chip Select Input

High Terminal

Wiper Terminal

Low Terminal

Ground Supply Voltage Up/Down Input

FN8178.2

September 5, 2006

Typical Attenuation Characteristics (dB)

www.BDTIC.com/Intersil

-20

-40

Attenuation (dB)

-43.5

X9314

-60

Principles of Operation

There are three sections of the X9314: the input control, counter and decode section; the nonvolatile memory; and the resistor array. The input control section operates just like an up/down counter. The output of this counter is decoded to turn on a single electronic switch connecting a point on the resistor array to the wiper output. Under the proper conditions the contents of the counter can be stored in nonvolatile memory and retained for future use. The resistor array is comprised of 31 individual resistors connected in series. At either end of the array and between each resistor is an electronic switch that transfers the potential at that point to the wiper.

The INC wiper along the resistor array. With CS is selected and enabled to respond to the

U/D increment or decrement (depending on the state of the U/D input) a five bit counter. The output of this counter is decoded to select one of thirty-two wiper positions along the resistive array.

The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. That is, the counter does not wrap around when clocked to either extreme.

The value of the counter is stored in nonvolatile memory whenever CS HIGH.

When the X9314 is powered-down, the last counter position stored will be maintained in the nonvolatile memory. When power is restored, the contents of the memory are recalled and the counter is reset to the value last stored.

, U/D and CS inputs control the movement of the

set LOW the X9314

and INC inputs. HIGH to LOW transitions on INC will

transistions HIGH while the INC input is also

1620242831

Tap Position

Operation Notes

The system may select the X9314, move the wiper and deselect the device without having to store the latest wiper position in nonvolatile memory. The wiper

movement is performed as described above; once the new position is reached, the system would keep the INC while taking CS HIGH. The new wiper position would be maintained until changed by the system or until a powerup/down cycle recalled the previously stored data.

This would allow the system to always power-up to a preset value stored in nonvolatile memory; then during system operation minor adjustments could be made. The adjustments might be based on user preference, system parameter changes due to temperature drift, etc.

The state of U/D This allows the host system to enable the X9314 and then move the wiper up and down until the proper trim is attained.

tIW/R

TOTAL

The electronic switches on the X9314 operate in a “make before break” mode when the wiper changes tap positions. If the wiper is moved several positions multiple taps are connected to the wiper for t R a significant amount if the wiper is moved several positions.

value for the device can temporarily be reduced by

TOTAL

may be changed while CS remains LOW.

(INC to VW change). The

LOW

Power-up and Down Requirement

The are no restrictions on the sequencing of VCC and the voltages applied to the potentiometer pins during power-up or power-down conditions. During power-up, the data sheet parameters for the DCP do not fully apply until 1 millisecond after V always in effect.

reaches its final value. The VCC ramp rate spec is

FN8178.2

September 5, 2006

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