Datasheet X9314WSM3, X9314WP, X9314WMM3, X9314WMM, X9314WMI3 Datasheet (XICOR)

APPLICATION NOTES

AVAILABLE

AN42 • AN44–50 • AN52 • AN53 • AN71 • AN73

Terminal Voltage ±5V, 32 Taps, Log Taper

X9314

X9314

E2POT™ Nonvolatile Digital Potentiometer

FEATURES

• Low Power CMOS

—VCC = 3V to 5.5V
—Active Current, 3mA Max
—Standby Current, 500µA Max

• 31 Resistive Elements

—Temperature Compensated
—±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

• X9314W = 10KΩ

• Packages

—8-Lead MSOP
—8-Lead PDIP
—8-Lead SOIC

FUNCTIONAL DIAGRAM

DESCRIPTION

The Xicor 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.

All Xicor nonvolatile Digitally Controlled Potentiometers
are designed and tested for applications requiring ex­tended endurance and data retention.

U/D
INC

CS

V

CC

GND

E2POT™ is a trademark of Xicor, Inc.

©Xicor, Inc. 1994, 1995, 1996 Patents Pending Characteristics subject to change without notice
6427-1.7 6/12/96 T3/C1/D8 NS

5-BIT
UP/DOWN
COUNTER

5-BIT

NONVOLATILE

MEMORY

STORE AND

RECALL

CONTROL

CIRCUITRY

ONE

OF

THIRTY -

TWO

DECODER

1

31

30

29

28

V

H

TRANSFER

GATES

2

1

0

RESISTOR

ARRAY

V

L

V

W

6427 FHD F01

X9314

PIN DESCRIPTIONS
VH and V

L

The high (VH) and low (VL) terminals of the X9314
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 VL and VH 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.

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 40Ω.

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 CONFIGURATION

8-LEAD DIP/SOIC

INC
U/D

V

V

V

V
SS

V
SS

V

H

H

W

L

1
2

X9314

3
4

8-LEAD MSOP

1
2

X9314

3
4

8
7
6
5

8
7
6
5

PIN NAMES

Symbol Description

V

H

V

W

V

L

V

SS

V

CC

High Terminal
Wiper Terminal
Low Terminal
Ground
Supply Voltage

U/D Up/Down Input

INC Increment Input
CS Chip Select Input

V

CC

CS
V

L

V

W

U/D
INC
V

CC

CS

6427 ILL F02.2

6427 PGM T01

Typical Attenuation Characteristics (dB)

0

-20

-40

-43.5

ATTENUATION (dB)

-60
31

28

24

20

16

TAP POSITION

2

12

48

6427 ILL F07

0

X9314

DEVICE 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, U/D and CS inputs control the movement of the
wiper along the resistor array. With CS set LOW the
X9314 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 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 transistions HIGH while the INC input is
also 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.

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
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 state of U/D may be changed while CS remains
LOW. 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 tIW (INC to V
change). The R

value for the device can tempo-

TOTAL

rarily be reduced by a significant amount if the wiper is
moved several positions.

R

with VCC Removed

TOTAL

The end to end resistance of the array will fluctuate once
VCC is removed.

W

SYMBOL TABLE

WAVEFORM

INPUTS

Must be
steady

May change
from LOW
to HIGH

May change
from HIGH
to LOW

Don’t Care:
Changes
Allowed

N/A

OUTPUTS

Will be
steady

Will change
from LOW
to HIGH

Will change
from HIGH
to LOW

Changing:
State Not
Known

Center Line
is High
Impedance

3

X9314

ABSOLUTE MAXIMUM RATINGS*

Temperature under Bias .................. –65°C to +135°C

Storage Temperature ....................... –65°C to +150°C

Voltage on CS, INC, U/D and V

with Respect to V

Voltage on VH and V

Referenced to V

SS

L

.................................

SS

CC

...............................

–1V to +7V
–8V to +8V

∆V = |VH–VL|

X9314W..........................................................10V

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

Wiper Current.....................................................±1mA

ANALOG CHARACTERISTICS
Electrical Characteristics

End-to-End Resistance Tolerance ..................... ±20%

Power Rating at 25°C

X9314W......................................................10mW

Wiper Current............................................ ±1mA Max.

Typical Wiper Resistance......................... 40Ω at 1mA

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

Relative Variation

Relative variation is a measure of the error in step size
between taps = log(V

w(n)

) – log(V

) = 0.07±0.003 for

w(n-1)

tap n = 2 – 31

*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 specifica­tion is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.

Temperature Coefficient

(–40°C to +85°C)

X9314W .....................................+600 ppm/°C Typical

Ratiometric Temperature Coefficient ............ ±20 ppm

Wiper Adjustability

Unlimited Wiper Adjustment

(Non-Store operation)

Wiper Position Store Operations ............. 100,000

Data Changes

Physical Characteristics

Marking Includes

Manufacturer’s Trademark
Resistance Value or Code
Date Code

Typical Electrical Taper

100.0%

90.0%

80.0%

70.0%

60.0%

50.0%

40.0%

% Total Resistance

30.0%

20.0%

10.0%

0.0%

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

Tap

4

6427 ILL F06

X9314

RECOMMENDED OPERATING CONDITIONS

Temperature Min. Max.

Commercial 0°C +70°C
Industrial –40°C +85°C
Military –55°C +125°C

6427 PGM T03.1

Supply Voltage Limits

X9314 5V ±10%

X9314-3 3V to 5.5V

6427 PGM T04.1

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

Limits

Symbol Parameter Min. Typ.

I

I

CC

SB

VCC Active Current 1 3 mA CS = VIL, U/D = VIL or VIH and

Standby Supply Current 500 µA CS = VCC – 0.3V, U/D and INC =

(4)

Max. Units Test Conditions

INC = 0.4V/2.4V @ max. t

CYC

VSS or VCC – 0.3V

I

LI

CS, INC, U/D Input ±10 µAVIN = VSS to V

CC

Leakage Current

V

IH

CS, INC, U/D Input 2 VCC + 1 V
HIGH Voltage

V

IL

CS, INC, U/D Input –1 0.8 V
LOW Voltage

R

W

V

VH

V

VL

C

IN

Wiper Resistance 40 100 Ω Max. Wiper Current ±1mA
VH Terminal Voltage –5 +5 V
VL Terminal Voltage –5 +5 V

(5)

CS, INC, U/D Input 10 pF VCC = 5V, VIN = VSS,
Capacitance TA = 25°C, f = 1MHz

6427 PGM T05.3

STANDARD PARTS

Part Number Maximum Resistance Wiper Increments Minimum Resistance

X9314W 10KΩ Log Taper 40Ω

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

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

Test Circuit #1 Test Circuit #2

V

V

H

TEST POINT

V

W

V

L

6427 ILL F04 6427 ILL F05

5

H

TEST POINT

V

W

FORCE

V

L

CURRENT

6427 PGM T08.1

X9314

A.C. CONDITIONS OF TEST

Input Pulse Levels 0V to 3V
Input Rise and Fall Times 10ns
Input Reference Levels 1.5V

6427 PGM T05.1

MODE SELECTION

CS INC U/D Mode

L H Wiper Up
L L Wiper Down

H X Store Wiper Position

H X X Standby

L X No Store, Return to

Standby

6427 PGM T06

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

Limits

Symbol Parameter Min. Typ.

t

Cl

t

lD

t

DI

t

lL

t

lH

t

lC

t

CPH

t

IW

t

CYC

t

R, tF

t

PU

tR V

(7)

(7)

CC

CS to INC Setup 100 ns
INC HIGH to U/D Change 100 ns
U/D to INC Setup 2.9 µs
INC LOW Period 1 µs
INC HIGH Period 1 µs
INC Inactive to CS Inactive 1 µs
CS Deselect Time 20 ms
INC to Vw Change 100 500 µs
INC Cycle Time 4 µs
INC Input Rise and Fall Time 500 µs

Power up to Wiper Stable 500 µs
V

Power-up Rate 0.2 50 mV/µs

CC

(6)

Max. Units

6427 PGM T07.3

A.C. Timing

CS

t

CYC

t

CI

INC

U/D

t

IW

V

W

Notes: (6) Typical values are for TA = 25°C and nominal supply voltage.

(7) This parameter is periodically sampled and not 100% tested.
(8) MI in the A.C. timing diagram refers to the minimum incremental change in the VW output due to a change in the wiper position.

t

IL

t

ID

t

IH

t

IC

t

DI

MI

6

(8)

t

CPH

t

F

90% 90%

10%

t

R

6427 FHD F03

X9314

PACKAGING INFORMATION

8-LEAD MINIATURE SMALL OUTLINE GULL WING PACKAGE TYPE M

0.012 + 0.006 / -0.002
(0.30 + 0.15 / -0.05)

0.118 ± 0.002
(3.00 ± 0.05)

0.030 (0.76)

0.118 ± 0.002
(3.00 ± 0.05)

0.0256 (0.65) TYP

R 0.014 (0.36)

0.0216 (0.55)

0.036 (0.91)

0.032 (0.81)

0.040 ± 0.002
(1.02 ± 0.05)

0.007 (0.18)

0.005 (0.13)

NOTE:

1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS)

7° TYP

0.008 (0.20)

0.004 (0.10)

0.150 (3.81)

0.193 (4.90)

REF.
REF.

3003 ILL 01

7

X9314

PACKAGING INFORMATION

8-LEAD PLASTIC DUAL IN-LINE PACKAGE TYPE P

0.430 (10.92)

0.360 (9.14)

0.260 (6.60)

0.240 (6.10)

PIN 1 INDEX

PIN 1

0.300

(7.62) REF.

0.060 (1.52)

0.020 (0.51)

HALF SHOULDER WIDTH ON

ALL END PINS OPTIONAL

SEATING

PLANE

0.150 (3.81)

0.125 (3.18)

0.015 (0.38)
MAX.

TYP. 0.010 (0.25)

0.110 (2.79)

0.090 (2.29)

0.325 (8.25)

0.300 (7.62)

0.065 (1.65)

0.045 (1.14)

0.020 (0.51)

0.016 (0.41)

NOTE:

1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)

2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH

0.145 (3.68)

0.128 (3.25)

0.025 (0.64)

0.015 (0.38)

0°

15°

3926 FHD F01

8

X9314

PACKAGING INFORMATION

8-LEAD PLASTIC SMALL OUTLINE GULL WING PACKAGE TYPE S

PIN 1 INDEX

(4X) 7°

0.050 (1.27)

0.010 (0.25)

0.020 (0.50)

X 45°

PIN 1

0.014 (0.35)

0.019 (0.49)

0.188 (4.78)

0.197 (5.00)

0.150 (3.80)

0.158 (4.00)

0.004 (0.19)

0.010 (0.25)

0.228 (5.80)

0.244 (6.20)

0.053 (1.35)

0.069 (1.75)

0.050" TYPICAL

0° – 8°

0.0075 (0.19)

0.010 (0.25)

0.016 (0.410)

0.037 (0.937)

0.250"

FOOTPRINT

NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)

3926 FHD F22.1

9

0.050"
TYPICAL

0.030"

TYPICAL

8 PLACES

X9314

ORDERING INFORMATION

X9314 E2POT 10K Ohms, Log Taper

X9314W X X X

VCC Range

Blank = VCC = 5V ±10%
3 = VCC = 3V to 5.5V

Temperature Range

Blank = 0°C to +70°C
I = –40°C to +85°C
M = –55°C to +125°C

Package

M = 8-Lead MSOP
P = 8-Lead Plastic DIP
S = 8-Lead SOIC

End to End Resistance

W = 10KΩ

Part Mark Convention

X9314W X

P = 8-Lead Plastic DIP
Blank = 8-Lead SOIC

(Date Code) X

Blank = 5V ±10%, 0°C to 70°C
I = 5V ±10%, -40°C to +85°C
D = 3V to 5.5V, 0°C to 70°C
E = 3V to 5.5V, -40°C to +85°C

LIMITED WARRANTY

Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Xicor, Inc. makes no warranty,
express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement.
Xicor, Inc. makes no warranty of merchantability or fitness for any purpose. Xicor, Inc. reserves the right to discontinue production and change specifications and
prices at any time and without notice.

Xicor, Inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xicor, Inc. product. No other circuits, patents, licenses are
implied.

U.S. PATENTS

Xicor products are covered by one or more of the following U.S. Patents: 4,263,664; 4,274,012; 4,300,212; 4,314,265; 4,326,134; 4,393,481; 4,404,475;
4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846; 4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829, 482; 4,874, 967; 4,883, 976. Foreign patents and
additional patents pending.

LIFE RELATED POLICY

In situations where semiconductor component failure may endanger life, system designers using this product should design the system with appropriate error
detection and correction, redundancy and back-up features to prevent such an occurence.

Xicor's products are not authorized for use in critical components in life support devices or systems.

1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose
failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant
injury to the user.

2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or effectiveness.

10