Document Outline
- Table of Contents
- Product Selection
- Data Sheet Alpha
- Ap Note Alpha
X9514
1
Xicor, Inc. 1994, 1995, 1996 Patents Pending
Characteristics subject to change without notice
6487-3.5 7/3/96 T5/C3/D2 NS
DESCRIPTION
The Xicor X9514 is a push button controlled, logarithmic
taper potentiometer and is ideal for push button con-
trolled 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
2
memory and then be recalled upon a subsequent power-
on operation.
All Xicor nonvolatile products are designed and tested
for applications requiring extended endurance and data
retention.
FEATURES
Push Button Controlled
Low Power CMOS
--Active Current, 3mA Max
--Standby Current, 200
A 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 = 10K
Packages
--8-Lead PDIP
--8-Lead SOIC
--14-Lead TSSOP
FUNCTIONAL DIAGRAM
PushPotTM Potentiometer (Push Button Controlled)
X9514
6487 ILL F01.1
5-BIT
UP/DOWN
COUNTER
5-BIT
EEPROM
MEMORY
STORE AND
RECALL
CONTROL
CIRCUITRY
ONE
OF
THIRTY-
TWO
DECODER
RESISTOR
ARRAY
31
30
29
28
2
1
0
VL
VW
VH
PU
PD
ASE
TRANSFER
GATES
AUTOSTORE is a registered trademark of Xicor, Inc.
E
2
POTTM and PushPotTM are trademarks of Xicor, Inc.
Terminal Voltage
5V, 32 Taps, Log Taper
A
PPLICATION
N
OTES
A V A I L A B L E
AN42 AN4450 AN52 AN53 AN73
X9514
2
PIN DESCRIPTIONS
V
H
and V
L
The high (V
H
) and low (V
L
) terminals of the X9514 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
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:
V
IL
AUTOSTORE is enabled. When V
CC
powers-
down an automatic store cycle takes place.
V
IH
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 E
2
PROM.
PIN CONFIGURATION
PIN NAMES
Symbol
Description
V
H
High Terminal
V
W
Wiper Terminal
V
L
Low Terminal
V
SS
Ground
V
CC
Supply Voltage
PU
Push Up Input
PD
Push Down Input
ASE
AUTOSTORE Enable Input
NC
No Connect
6487 PGM T01.2
VCC
ASE
VL
VW
PU
PD
VH
VSS
1
2
3
4
8
7
6
5
X9514
DIP/SOIC
VCC
ASE
NC
NC
NC
VL
VW
6487 ILL F02.2
PU
PD
NC
NC
NC
VH
VSS
1
2
3
4
5
6
7
14
13
12
11
10
9
8
X9514
TSSOP
ATTENUATION (dB)
TAP POSITION
6487 ILL F04
0
4
8
12
16
20
24
28
31
-20
-40
-43.5
0
-60
Typical Attenuation Characteristics (dB)
X9514
3
DEVICE OPERATION
There are three sections of the X9514: the input control,
counter and decode section; the E
2
PROM 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 E
2
PROM 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 trans-
fers 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 switch-
ing 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 continu-
ously for a multiple increments/decrements. The num-
ber 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 E
2
PROM memory
whenever the chip senses a powers-down of V
CC
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 V
SS
. 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
TOTAL
with V
CC
Removed
The end to end resistance of the array will fluctuate once
V
CC
is removed.
V
CC
V
CC
PU
PD
ASE
V
SS
VH
VW
VL
3.3F
8
1
2
7
4
3
5
6
6487 ILL F05.2
V
CC
PU
PD
ASE
VH
VW
VL
V
SS
8
1
2
7
3
5
6
6487 ILL F05a
V
CC
Typical circuit with
ASE
store pin controlled by
push button switch
Typical circuit with
ASE
store pin used in
AUTOSTORE mode
X9514
4
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 V
SS
........................... 1V to +7V
Voltage on V
H
and V
L
Referenced to V
SS
V = |V
H
V
L
| ......................................................... 10V
Lead Temperature (Soldering 10 seconds) ....... 300
C
Wiper Current .....................................................
1mA
*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.
ANALOG CHARACTERISTICS
Electrical Characteristics
End-to-End Resistance Tolerance .....................
20%
Power Rating at 25
C
X9514W ...................................................... 10mW
Wiper Current ............................................
1mA Max.
Typical Wiper Resistance ......................... 40
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
w(n-1)
) = 0.08
0.05
for tap n = 2 31
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
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
100.0%
90.0%
80.0%
70.0%
60.0%
50.0%
40.0%
30.0%
20.0%
10.0%
0.0%
% Total Resistance
Tap
6487 ILL F08
X9514
5
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
1
3
mA
PU
or
PD
held at V
IL
the others at V
IH
I
SB
Standby Supply Current
200
A
PU
=
PD
= V
H
I
LI
ASE
,
PU
,
PD
Input
10
A
V
IN
= V
SS
to V
CC
Leakage Current
V
IH
ASE
,
PU
,
PD
Input
2
V
CC
+ 1
V
HIGH Voltage
V
IL
ASE
,
PU
,
PD
Input
1
0.8
V
LOW Voltage
R
W
Wiper Resistance
40
100
Max. Wiper Current
1mA
V
VH
VH Terminal Voltage
5
+5
V
V
VL
VL Terminal Voltage
5
+5
V
C
IN
(5)
ASE
,
PU
,
PD
Input
10
pF
V
CC
= 5V, V
IN
= 0V,
Capacitance
T
A
= 25
C, f = 1MHz
6487 PGM T05.4
RECOMMENDED OPERATING CONDITIONS
Temperature
Min.
Max.
Commercial
0
C
+70
C
Industrial
40
C
+85
C
Military
55
C
+125
C
6487 PGM T03.1
Supply Voltage
Limits
X9514
5V
10%
6487 PGM T04.1
Notes: (4) Typical values are for T
A
= 25
C and nominal supply voltage.
(5) This parameter is periodically sampled and not 100% tested.
STANDARD PARTS
Part Number
Maximum Resistance
Wiper Increments
Minimum Resistance
X9514W
10K
Log Taper
40
6487 PGM T08.1
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
X9514
6
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified)
Limits
Symbol
Parameter
Min.
Typ.
(6)
Max.
Units
t
GAP
Time Between Two Separate Push Button Events
0
s
t
DB
Debounce Time
60
ms
t
S SLOW
After Debounce to Wiper Change on a Slow Mode
100
250
375
ms
t
S FAST
(7)
Wiper Change on a Scan Mode
25
50
75
ms
t
PU
(7)
Power Up to Wiper Stable
500
s
t
R
V
cc
(7)
V
CC
Power-up Rate
0.2
50
mV/
s
t
ASTO
(7)
AUTOSTORE Cycle Time
2
ms
V
ASTH
(7)
AUTOSTORE Threshold Voltage
4
V
V
ASEND
(7)
AUTOSTORE Cycle End Voltage
3.5
V
6487 PGM T07.3
AUTOSTORE Cycle Timing Diagram
Notes: V
ASTH
AUTOSTORE threshold voltage
V
ASEND
AUTOSTORE cycle end voltage
t
ASTO
AUTOSTORE cycle time
(6) Typical values are for T
A
= 25
C and nominal supply voltage.
(7) This parameter is periodically sampled and not 100% tested.
6487 ILL F03.2
5
AUTOSTORE CYCLE IN PROGRESS
V
ASTH
V
ASEND
t
ASTO
V
CC
VOL
TS (V)
STORE TIME
TIME (ms)
X9514
7
Slow Mode Timing
Fast Mode Timing
Notes: (1) MI in the A.C. timing diagram refers to the minimum incremental change in the wiper voltage.
Notes: (1) MI in the A.C. timing diagram refers to the minimum incremental change in the wiper voltage.
PU
VW
MI
(1)
tDB
6487 ILL F06.1
tGAP
VW
6487 ILL F07
tS SLOW
tS FAST
MI
(1)
1 Second
PU
tDB
X9514
8
PACKAGING INFORMATION
3926 FHD F01
NOTE:
1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH
0.020 (0.51)
0.016 (0.41)
0.150 (3.81)
0.125 (3.18)
0.110 (2.79)
0.090 (2.29)
0.430 (10.92)
0.360 (9.14)
0.300
(7.62) REF.
PIN 1 INDEX
0.145 (3.68)
0.128 (3.25)
0.025 (0.64)
0.015 (0.38)
PIN 1
SEATING
PLANE
0.065 (1.65)
0.045 (1.14)
0.260 (6.60)
0.240 (6.10)
0.060 (1.52)
0.020 (0.51)
TYP. 0.010 (0.25)
0
15
8-LEAD PLASTIC DUAL IN-LINE PACKAGE TYPE P
HALF SHOULDER WIDTH ON
ALL END PINS OPTIONAL
0.015 (0.38)
MAX.
0.325 (8.25)
0.300 (7.62)
X9514
9
PACKAGING INFORMATION
0.150 (3.80)
0.158 (4.00)
0.228 (5.80)
0.244 (6.20)
0.014 (0.35)
0.019 (0.49)
PIN 1
PIN 1 INDEX
0.010 (0.25)
0.020 (0.50)
0.050 (1.27)
0.188 (4.78)
0.197 (5.00)
0.004 (0.19)
0.010 (0.25)
0.053 (1.35)
0.069 (1.75)
(4X) 7
0.016 (0.410)
0.037 (0.937)
0.0075 (0.19)
0.010 (0.25)
0
8
X 45
3926 FHD F22.1
8-LEAD PLASTIC SMALL OUTLINE GULL WING PACKAGE TYPE S
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
0.250"
0.050" TYPICAL
0.050"
TYPICAL
0.030"
TYPICAL
8 PLACES
FOOTPRINT
X9514
10
PACKAGING INFORMATION
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
14-LEAD PLASTIC, TSSOP PACKAGE TYPE V
See Detail "A"
.031 (.80)
.041 (1.05)
.169 (4.3)
.177 (4.5)
.252 (6.4) BSC
.025 (.65) BSC
.193 (4.9)
.200 (5.1)
.002 (.05)
.006 (.15)
.047 (1.20)
.0075 (.19)
.0118 (.30)
0
8
.010 (.25)
.019 (.50)
.029 (.75)
Gage Plane
Seating Plane
Detail A (20X)
3926 FHD F32
X9514
11
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.
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 = 10K
ORDERING INFORMATION
X9514X
X
X
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