Page 1
APPLICATION NOTES
AVAILABLE
AN42 • AN44–50 • AN52 • AN53 • AN73
Terminal Voltage ±5V, 32 Taps, Log Taper
X9514
X9514
PushPot™ Potentiometer (Push Button Controlled)
FEATURES
• Push Button Controlled
• Low Power CMOS
—Active Current, 3mA Max
—Standby Current, 200µA Max
• 31 Resistive Elements
—Temperature Compensated
—±20% End to End Resistance Range
— –5V to +5V Range
• 32 Wiper Tap Points
—Logarithmic Taper
—Wiper Positioned via Two Push Button Inputs
—Slow & Fast Scan Modes
—AUTOSTORE® Option
—Manual Store Option
—Wiper Position Stored in Nonvolatile
Memory and Recalled on Power-Up
• 100 Year Wiper Position Data Retention
• X9514W = 10KΩ
• Packages
—8-Lead PDIP
—8-Lead SOIC
—14-Lead TSSOP
DESCRIPTION
The Xicor X9514 is a push button controlled, logarithmic
taper potentiometer and is ideal for push button controlled resistance trimming.
The X9514 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 PU and PD inputs.
The position of the wiper can be automatically stored in E
memory and then be recalled upon a subsequent poweron operation.
All Xicor nonvolatile products are designed and tested
for applications requiring extended endurance and data
retention.
2
FUNCTIONAL DIAGRAM
PU
PD
ASE
AUTOSTORE is a registered trademark of Xicor, Inc.
E2POT™ and PushPot™ are trademarks of Xicor, Inc.
©Xicor, Inc. 1994, 1995, 1996 Patents Pending Characteristics subject to change without notice
6487-3.5 7/3/96 T5/C3/D2 NS
5-BIT
UP/DOWN
COUNTER
5-BIT
EEPROM
MEMORY
STORE AND
RECALL
CONTROL
CIRCUITRY
ONE
THIRTY -
TWO
DECODER
OF
31
30
29
28
TRANSFER
GATES
2
1
0
1
RESISTOR
ARRAY
V
V
V
6487 ILL F01.1
H
L
W
Page 2
X9514
PIN DESCRIPTIONS
VH and V
L
The high (VH) and low (VL) terminals of the X9514 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 V
references the relative position of the terminal in relation
to wiper movement direction selected by the PU and PD
inputs and not the voltage potential on the terminal.
PU
The debounced PU input is for incrementing the wiper
position. An on-chip pull-up holds the PU input HIGH. A
switch closure to ground or a LOW logic level will, after
a debounce time, move the wiper to the next adjacent
higher tap position.
PD
The debounced PD input is for decrementing the wiper
position. An on-chip pull-up holds the PD input HIGH. A
switch closure to ground or a LOW logic level will, after
a debounce time, move the wiper to the next adjacent
lower tap position.
ASE
The debounced ASE (AUTOSTORE enable) pin can be
in one of two states:
VIL – AUTOSTORE is enabled. When VCC powersdown an automatic store cycle takes place.
VIH – AUTOSTORE is disabled. A LOW to HIGH will
initiate a manual store operation. This is for a user who
wishes to connect a push button switch to this pin. For
every valid push, the X9514 will store the current wiper
position to the E2PROM.
Typical Attenuation Characteristics (dB)
0
PIN CONFIGURATION
H
PIN NAMES
Symbol Description
V
H
V
W
V
L
V
SS
V
CC
PU Push Up Input
PD Push Down Input
ASE AUTOSTORE Enable Input
NC No Connect
DIP/SOIC
PU
1
PD
2
3
4
1
2
3
4
5
6
7
X9514
TSSOP
X9514
V
H
V
SS
PU
PD
NC
NC
NC
V
H
V
SS
14
13
12
11
10
8
V
CC
7
ASE
6
V
L
5
V
W
V
CC
ASE
NC
NC
NC
9
V
L
8
V
W
6487 ILL F02.2
High Terminal
Wiper Terminal
Low Terminal
Ground
Supply Voltage
6487 PGM T01.2
-20
-40
-43.5
ATTENUATION (dB)
-60
31
28
24
20
16
TAP POSITION
2
12
48
0
6487 ILL F04
Page 3
X9514
V
CC
V
CC
PU
PD
ASE
V
SS
VH
VW
VL
3.3µF
8
1
2
7
4
3
5
6
6487 ILL F05.2
DEVICE OPERATION
There are three sections of the X9514: the input control,
counter and decode section; the E2PROM 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 E2PROM 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 X9514 is designed to interface directly to two push
button switches for effectively moving the wiper up or
down. The PU and PD inputs increment or decrement a
5-bit counter respectively. The output of this counter is
decoded to select one of the thirty-two wiper positions
along the resistive array. The wiper increment input, PU
and the wiper decrement input, PD are both connected
to an internal pull-up so that they normally remain HIGH.
When pulled LOW by an external push button switch or
a logic LOW level input, the wiper will be switched to the
next adjacent tap position.
Internal debounce circuitry prevents inadvertent switching of the wiper position if PU or PD remain LOW for less
than 40ms, typical. Each of the buttons can be pushed
either once for a single increment/decrement or continuously for a multiple increments/decrements. The number of increments/decrements of the wiper position
depend on how long the button is being pushed. When
making a continuous push, after the first second, the
increment/decrement speed increases. For the first
second the device will be in the slow scan mode. Then
if the button is held for longer than 1 second the device
will be in the fast scan mode. As soon as the button is
released the X9514 will return to a standby condition.
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.
AUTOSTORE
The value of the counter is stored in E2PROM memory
whenever the chip senses a powers-down of VCC while
ASE is enabled (held LOW). When power is restored,
the content of the memory is recalled and the counter
reset to the last value stored.
If AUTOSTORE is to be implemented, ASE is typically
hard wired to VSS. If ASE is held HIGH during power up
and then taken LOW, the wiper will not respond to the
PU or PD inputs until ASE is brought HIGH and held
HIGH.
Manual (Push Button) Store
When ASE is not enabled (held HIGH) a push button
switch may be used to pull ASE LOW and released to
perform a manual store of the wiper position.
R
with VCC Removed
TOTAL
The end to end resistance of the array will fluctuate once
VCC is removed.
Typical circuit with ASE store pin controlled by
push button switch
V
CC
8
V
CC
1
PU
2
PD
7
ASE
VH
VW
VL
V
SS
6487 ILL F05a
3
5
6
Typical circuit with ASE store pin used in
AUTOSTORE mode
3
Page 4
X9514
ABSOLUTE MAXIMUM RATINGS*
Temperature under Bias .................. –65°C to +135°C
Storage Temperature ....................... –65°C to +150°C
Voltage on PU, PD, ASE and V
CC
with Respect to VSS........................... –1V to +7V
Voltage on VH and VL Referenced to V
SS
∆V = |VH–VL|.........................................................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
X9514W......................................................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
) – log(V
w(n)
) = 0.08±0.05
w(n-1)
for 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)
X9514W .....................................+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
6487 ILL F08
Page 5
X9514
RECOMMENDED OPERATING CONDITIONS
Temperature Min. Max.
Commercial 0°C +70°C
Industrial –40°C +85°C
Supply Voltage Limits
X9514 5V ±10%
6487 PGM T04.1
Military –55°C +125°C
6487 PGM T03.1
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)
Limits
Symbol Parameter Min. Typ.
I
I
I
CC
SB
LI
VCC Active Current 1 3 mA
Standby Supply Current 200 µA PU = PD = V
ASE, PU, PD Input 10 µAVIN = VSS to V
(4)
Max. Units Test Conditions
PU or PD held at VIL the others at V
H
CC
Leakage Current
V
IH
ASE, PU, PD Input 2 VCC + 1 V
HIGH Voltage
V
IL
ASE, PU, PD Input –1 0.8 V
LOW Voltage
R
W
V
VH
V
VL
(5)
C
IN
Wiper Resistance 40 100 Ω Max. Wiper Current ±1mA
VH Terminal Voltage –5 +5 V
VL Terminal Voltage –5 +5 V
ASE, PU, PD Input 10 pF VCC = 5V, VIN = 0V,
Capacitance TA = 25°C, f = 1MHz
6487 PGM T05.4
IH
STANDARD PARTS
Part Number Maximum Resistance Wiper Increments Minimum Resistance
X9514W 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.
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
6487 PGM T08.1
5
Page 6
X9514
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified)
Limits
Symbol Parameter Min. Typ.
(6)
Max. Units
t
GAP
t
DB
t
S SLOW
t
S FAST
(7)
t
PU
tR V
cc
t
ASTO
V
ASTH
V
ASEND
(7)
Time Between Two Separate Push Button Events 0 µs
Debounce Time 60 ms
After Debounce to Wiper Change on a Slow Mode 100 250 375 ms
(7)
Wiper Change on a Scan Mode 25 50 75 ms
Power Up to Wiper Stable 500 µs
(7)
VCC Power-up Rate 0.2 50 mV/µs
AUTOSTORE Cycle Time 2 ms
(7)
AUTOSTORE Threshold Voltage 4 V
(7)
AUTOSTORE Cycle End Voltage 3.5 V
AUTOSTORE Cycle Timing Diagram
5
VOLTS (V)
t
ASTO
V
CC
AUTOSTORE CYCLE IN PROGRESS
V
ASTH
V
ASEND
6487 PGM T07.3
Notes: V
STORE TIME
TIME (ms)
– AUTOSTORE threshold voltage
ASTH
V
– AUTOSTORE cycle end voltage
ASEND
t
– AUTOSTORE cycle time
ASTO
(6) Typical values are for TA = 25°C and nominal supply voltage.
(7) This parameter is periodically sampled and not 100% tested.
6487 ILL F03.2
6
Page 7
X9514
Slow Mode Timing
t
DB
t
GAP
PU
(1)
V
W
Notes: (1) MI in the A.C. timing diagram refers to the minimum incremental change in the wiper voltage.
MI
6487 ILL F06.1
Fast Mode Timing
t
DB
PU
t
S FAST
t
S SLOW
V
W
MI
(1)
1 Second
Notes: (1) MI in the A.C. timing diagram refers to the minimum incremental change in the wiper voltage.
7
6487 ILL F07
Page 8
X9514
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
Page 9
X9514
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)
PIN 1
X 45°
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
Page 10
X9514
PACKAGING INFORMATION
14-LEAD PLASTIC, TSSOP PACKAGE TYPE V
.025 (.65) BSC
0° – 8°
.0075 (.19)
.0118 (.30)
.193 (4.9)
.200 (5.1)
.019 (.50)
.029 (.75)
Detail A (20X)
.169 (4.3)
.177 (4.5)
.047 (1.20)
.002 (.05)
.006 (.15)
.010 (.25)
Gage Plane
Seating Plane
.252 (6.4) BSC
.031 (.80)
.041 (1.05)
See Detail “A”
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
10
3926 FHD F32
Page 11
X9514
ORDERING INFORMATION
X9514X X X
Temperature Range
Blank = Commercial = 0°C to +70°C
I = Industrial = –40°C to +85°C
M = Military = –55°C to +125°C
Package
P = 8-Lead Plastic DIP
S = 8-Lead SOIC
V = 14-Lead TSSOP
End to End Resistance
W = 10KΩ
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.
11
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