X9313.PDF

A PPLICATION N OTES

AVAILABLE

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

Terminal Voltage

5V, 32 Taps

X9313

E 2 POT™ Nonvolatile Digital Potentiometer

FEATURES

• Low Power CMOS

—V CC = 3V to 5.5V

—Active Current, 3mA Max

—Standby Current, 500

DESCRIPTION

The Xicor X9313 is a solid state nonvolatile potentiom-

eter and is ideal for digitally controlled resistance

trimming.

• 31 Resistive Elements

—Temperature Compensated

—

A Max

The X9313 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 nonvola-

tile memory and then be recalled upon a subsequent

power-up operation.

20% End to End Resistance Range

— –5V to +5V Range

• 32 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

• X9313Z = 1K W

• X9313W = 10K W

• Packages

—8-Lead MSOP

—8-Lead PDIP

—8-Lead SOIC

The resolution of the X9313 is equal to the maximum

resistance value divided by 31. As an example, for the

X9313W (10K

) each tap point represents 323

All Xicor nonvolatile memories are designed and tested

for applications requiring extended endurance and data

retention.

FUNCTIONAL DIAGRAM

U/D

INC

5-BIT

UP/DOWN

COUNTER

V H

5-BIT

NONVOLATILE

MEMORY

ONE

THIRTY-

TWO

DECODER

TRANSFER

GATES

RESISTOR

ARRAY

STORE AND

RECALL

CONTROL

CIRCUITRY

V CC

GND

V L

V W

3866 FHD F01

E 2 POT™ is a trademark of Xicor, Inc.

©Xicor, Inc. 1994, 1995, 1996 Patents Pending

Characteristics subject to change without notice

3866-1.5 6/12/96 T5/C1/D8 NS

X9313

X9313

PIN DESCRIPTIONS

PIN CONFIGURATION

V H and V L

The high (V H ) and low (V L ) terminals of the X9313 are

equivalent to the fixed terminals of a mechanical potenti-

ometer. The minimum voltage is –5V and the maximum is

+5V. It should be noted that the terminology of V L and V H

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.

8-LEAD DIP/SOIC

INC

U/D

V H

V SS

X9313

V CC

V L

V W

8-LEAD MSOP

V W

Vw is the wiper terminal, equivalent to the movable

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 40

V H

V SS

V W

V L

X9313

U/D

INC

V CC

3866 ILL F02.2

Up/Down (U/ D )

The U/D input controls the direction of the wiper move-

ment and whether the counter is incremented or

decremented.

PIN NAMES

Symbol

Description

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.

V H

High Terminal

V W

Wiper Terminal

V L

Low Terminal

V SS

Ground

V CC

Supply Voltage

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 X9313

will be placed in the low power standby mode until the

device is selected once again.

U/D

Up/Down Input

INC

Increment Input

Chip Select Input

3866 PGM T01

X9313

DEVICE OPERATION

Operation Notes

There are three sections of the X9313: 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 system may select the X9313, move the wiper and

deselect the device without having to store the latest

wiper position in nonvolatile memory. The wiper move-

ment is performed as described above; once the new

position is reached, the system would the keep INC

LOW while taking CS HIGH. The new wiper position

would be maintained until changed by the system or

until a power-up/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 INC, U/D and CS inputs control the movement of the

wiper along the resistor array. With CS set LOW the

X9313 is selected and enabled to respond to the

U/D and INC inputs. HIGH to LOW transitions on INC will

increment or decrement (depending on the state of the

U/D input) a seven bit counter. The output of this counter

is decoded to select one of thirty two wiper positions

along the resistive array.

The state of U/D may be changed while CS remains

LOW. This allows the host system to enable the X9313

and then move the wiper up and down until the proper

trim is attained.

T IW /R TOTAL

The electronic switches on the X9313 operate in a

“make before break” mode when the wiper changes tap

positions. If the wiper is moved several positions mul-

tiple taps are connected to the wiper for t IW (INC to V W

change). The R TOTAL value for the device can tempo-

rarily be reduced by a significant amount if the wiper is

moved several positions.

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 transistions HIGH while the INC input is

also HIGH.

When the X9313 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.

R TOTAL with V CC Removed

The end to end resistance of the array will fluctuate once

V CC is removed.

SYMBOL TABLE

WAVEFORM

INPUTS

OUTPUTS

Must be

steady

Will be

steady

May change

from LOW

to HIGH

Will change

from LOW

to HIGH

May change

from HIGH

to LOW

Will change

from HIGH

to LOW

Don’t Care:

Changes

Allowed

Changing:

State Not

Known

N/A

Center Line

is High

Impedance

X9313

ABSOLUTE MAXIMUM RATINGS*

Temperature under Bias .................. –65

C to +135

*COMMENT

Stresses above those listed under “Absolute Maximum

Ratings” may cause permanent damage to the device.

This is a stress rating only and the functional operation

of the device at these or any other conditions above

those listed in the operational sections of this specifica-

tion is not implied. Exposure to absolute maximum

rating conditions for extended periods may affect device

reliability.

Storage Temperature ....................... –65

C to +150

Voltage on CS, INC, U/D and V CC

with Respect to V SS ............................... –1V to +7V

Voltage on V H and V L Referenced to V SS

Wiper Current .....................................................

1mA

ANALOG CHARACTERISTICS

Electrical Characteristics

End-to-End Resistance Tolerance .....................

20%

X9313Z ....................................... +600 ppm/

C to +85

X9313Z ....................................................... 16mW

X9313W ...................................................... 10mW

Wiper Current ............................................

C Typical

X9313W, X9313U, X9313T ........ +300 ppm/

C Typical

Ratiometric Temperature Coefficient ............

20 ppm

1mA Max.

Typical Wiper Resistance ......................... 40

Wiper Adjustability

Unlimited Wiper Adjustment (Non-Store operation)

Wiper Position Store Operations ............... 10,000

Data Changes

at 1mA

Typical Noise .......................... < –120dB/ Hz Ref: 1V

Resolution

Resistance ............................................................. 3%

Physical Characteristics

Marking Includes

Manufacturer’s Trademark

Resistance Value or Code

Date Code

Linearity

Absolute Linearity (1) ........................................

1.0 Ml (2)

Relative Linearity (3) .....................................

0.2 Ml (2)

Test Circuit #1

Test Circuit #2

V H

TEST POINT

V W

FORCE

CURRENT

V L

3866 FHD F04

3866 FHD F05

Notes: (1) Absolute Linearity is utilized to determine actual wiper voltage versus expected voltage

= (V w(n) (actual) – V w(n) (expected)) = ± 1 Ml Maximum.

(2) 1 Ml = Minimum Increment = R TOT /31.

(3) Relative Linearity is a measure of the error in step size between taps = V W(n+1) – [V w(n) + Ml] = +0.2 Ml.

V = |V H –V L |

X9313Z ............................................................. 4V

X9313W, X9313U, X9313T ............................ 10V

Lead Temperature (Soldering 10 seconds) ....... 300

Temperature Coefficient

(–40

Power Rating at 25

X9313

RECOMMENDED OPERATING CONDITIONS

Temperature

Min.

Max.

Supply Voltage

Limits

Commercial

+70

X9313

10%

Industrial

–40

+85

X9313-3

3V to 5.5V

3866 PGM T04.1

Military

–55

+125

3866 PGM T03.1

D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)

Limits

Symbol

Parameter

Min.

Typ. (4)

Max. Units

Test Conditions

I CC

V CC Active Current

CS = V IL , U/D = V IL or V IH and

INC = 0.4V/2.4V @ max. t CYC

I SB

Standby Supply Current

200

500

CS = V CC – 0.3V, U/D and INC =

V SS or V CC – 0.3V

I LI

CS, INC, U/D Input

A IN = V SS to V CC

Leakage Current

V IH

CS, INC, U/D Input

V CC + 1

HIGH Voltage

V IL

CS, INC, U/D Input

–1

0.8

LOW Voltage

R W

Wiper Resistence

100

Max. Wiper Current

1mA

V VH

VH Terminal Voltage

–5

V VL

VL Terminal Voltage

–5

C IN (5) CS, INC, U/D Input

V CC = 5V, V IN = V SS ,

Capacitance

T A = 25

C, f = 1MHz

3866 PGM T05.3

STANDARD PARTS

Part Number

Maximum Resistance

Wiper Increments

Minimum Resistance

X9313Z

32.3

X9313W

10K

323

X9313U

50K

2381

X9313T

100K

3226

W 3866 PGM T08.1

Notes: (4) Typical values are for T A = 25 ° C and nominal supply voltage.

(5) This parameter is periodically sampled and not 100% tested.

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