REV 1.1.1 2/7/02
Characteristics subject to change without notice.
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Single Digitally-Controlled (XDCP
TM
) Potentiometer (Push Button Controlled)
FEATURES
Push button controlled
Low power CMOS
--Active current, 3mA max
--Standby current, 200A max
31 resistive elements
--Temperature compensated
--
20% end to end resistance range
--5V to +5V range
32 wiper tap points
--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
X9511W = 10K
Packages
--8-lead PDIP
--8-lead SOIC
DESCRIPTION
The Xicor X9511 is a push button controlled potentiom-
eter that is ideal for push button controlled resistance
trimming.
The X9511 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 sub-
sequent power-on operation.
The resolution of the X9511 is equal to the maximum
resistance value divided by 31. As an example, for the
X9511W (10K
) each tap point represents 323
.
All Xicor nonvolatile products are designed and tested
for applications requiring extended endurance and data
retention.
BLOCK DIAGRAM
5-Bit
Up/Down
Counter
5-Bit
EEPROM
Memory
Store and
Recall
Control
Circuitry
One
of
Thirty-Two
Decoder
Resistor
Array
V
H
PU
Transfer
Gates
ASE
V
L
V
W
0
1
2
28
29
30
31
PD
X9511
AUTOSTORE is a registered trademark of Xicor, Inc.
A
PPLICATION
N
OTES
A V A I L A B L E
AN99 AN115 AN120 AN124 AN133 AN134 AN135
Terminal Voltage 5V, 32 Taps
X9511
Characteristics subject to change without notice.
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PIN DESCRIPTIONS
V
H
/R
H
and V
L
/R
L
The high (V
H
/R
H
) and low (V
L
/R
L
) terminals of the
X9511 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
L
/R
L
and V
H
/R
H
reference 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 ini-
tiate a manual store operation. This is for the user who
wishes to connect a push button switch to this pin. For
every valid push, the X9511 will store the current wiper
position to the EEPROM.
PIN CONFIGURATION
PIN NAMES
DEVICE OPERATION
There are three sections of the X9511: the input control,
counter and decode section; the EEPROM 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 EEPROM 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 X9511 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
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 go into the fast scan mode. As soon as the button is
released the X9511 will return to a standby condition.
V
H
V
CC
PU
PD
1
2
3
4
8
7
6
5
X9511
DIP/SOIC
V
SS
ASE
V
L
V
W
Symbol
Description
V
H
/R
H
High Terminal
V
W
/R
W
Wiper Terminal
V
L
/R
L
Low Terminal
V
SS
Ground
V
CC
Supply Voltage
PU
Push Up Input
PD
Push Down Input
ASE
AUTOSTORE Enable Input
X9511
Characteristics subject to change without notice.
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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 EEPROM memory
whenever the chip senses a power-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.
Figure 1. Typical circuit with ASE store pin
controlled by push button switch
Figure 2. Typical circuit with ASE store pin used in
AUTOSTORE mode
3
5
6
8
1
2
7
V
CC
2K
V
CC
PU
PD
ASE
V
H
V
W
V
L
V
SS
4
3
5
8
1
2
7
V
CC
V
CC
PU
PD
ASE
V
SS
V
H
V
W
V
L
3.3F
6
X9511
Characteristics subject to change without notice.
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ABSOLUTE MAXIMUM RATINGS
Temperature under bias ....................65
C to +135
C
Storage temperature .........................65
C to +150
C
Voltage on PU, PD, and V
CC
with respect to V
SS
.................................. 1V to +7V
Voltage on V
H
and V
L
referenced to V
SS
.................................... 8V to +8V
V = |V
H
V
L
|
X9511W ............................................................. 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
X9511W ......................................................... 10mW
Wiper current
.................................................
1mA Max.
Typical wiper resistance ...........................40
at 1mA
Typical noise ............................ < 120dB/
Hz Ref: 1V
Resolution
Resistance ............................................................ 3%
Linearity
Absolute linearity
(1)
............................................
1.0 Ml
(2)
Relative linearity
(3)
.............................................
0.2 Ml
(2)
COMMENT
Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device.
This is a stress rating only; 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 reli-
ability.
Temperature Coefficient
40
C to +85
C
X9511W ...................................... +300 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
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
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
X9511
Characteristics subject to change without notice.
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RECOMMENDED OPERATING CONDITIONS
Temperature
Min.
Max.
Commercial
0
C
+70
C
Industrial
40
C
+85
C
Supply Voltage
Limits
X9511
5V
10%
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)
STANDARD PARTS
Notes: (4) Typical values are for T
A
= 25C and nominal supply voltage.
(5) This parameter is periodically sampled and not 100% tested.
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)
POWER UP AND DOWN REQUIREMENTS
The are no restrictions on the sequencing of V
CC
and the voltage 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 1ms
after V
CC
reaches its final value. The V
CC
ramp rate spec is always in effect.
Symbol
Parameter
Limits
Unit
Test Conditions
Min.
Typ.
(4)
Max.
I
CC
V
CC
active current
1
3
mA
PU or PD held at V
IL
the other at V
IH
I
SB
Standby supply current
100
200
A
PU = PD = V
IH
I
LI
PU, PD, ASE input leakage current
10
A
V
IN
= V
SS
to V
CC
V
IH
PU, PD, ASE input HIGH voltage
2
V
CC
+ 1
V
V
lL
PU, PD, ASE input LOW voltage
1
0.8
V
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 capacitance
10
pF
V
CC
= 5V, V
IN
= 0V, T
A
= 25
C,
f = 1MHz
Part Number
Maximum Resistance
Wiper Increments
Minimum Resistance
X9511W
10KW
323
40
Symbol
Parameter
Limits
Unit
Min.
Typ.
(6)
Max.
t
GAP
Time between two separate push button events
0
s
t
DB
Debounce time
30
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 fast 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
X9511
Characteristics subject to change without notice.
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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
= 25C and nominal supply voltage.
(7) This parameter is periodically sampled and not 100% tested.
Slow Mode Timing
Note:
(1) MI in the A.C. timing diagram refers to the minimum incremental change in the wiper voltage.
V
ASTH
V
CC
V
ASEND
t
ASTO
Store Time
Autos Cycle in Progress
Volts (V)
Time (ms)
5
t
GAP
t
DB
MI
(1)
V
W
PU
X9511
Characteristics subject to change without notice.
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Fast Mode Timing
Note:
(1) MI in the A.C. timing diagram refers to the minimum incremental change in the wiper voltage.
t
DB
PU
t
S SLOW
t
S FAST
MI
(1)
1 Second
V
W
X9511
Characteristics subject to change without notice.
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PACKAGING INFORMATION
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
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
.073 (1.84)
Max.
0.325 (8.25)
0.300 (7.62)
Plane
X9511
Characteristics subject to change without notice.
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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
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
X9511
Characteristics subject to change without notice.
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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, or licenses are implied.
TRADEMARK DISCLAIMER:
Xicor and the Xicor logo are registered trademarks of Xicor, Inc. AutoStore, Direct Write, Block Lock, SerialFlash, MPS, and XDCP are also trademarks of Xicor, Inc. All
others belong to their respective owners.
U.S. PATENTS
Xicor products are covered by one or more of the following U.S. Patents: 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; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084,667; 5,153,880; 5,153,691;
5,161,137; 5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. 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 occurrence.
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.
Xicor, Inc. 2000 Patents Pending
REV 1.1.1 2/7/02
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ORDERING INFORMATION
X9511X
X
X
Temperature Range
Blank = Commercial = 0C to +70C
I = Industrial = 40C to +85C
Package
P = 8-Lead Plastic DIP
S = 8-Lead SOIC
End to End Resistance
W = 10K
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