1
FN8160.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
X9116
Low Noise, Low Power, Low Cost
Digitally Controlled Potentiometer
(XDCPTM)
The Intersil X9116 is a digitally controlled nonvolatile
potentiometer designed to be used in trimmer applications.
The pot consists of 15 equal resistor segments that connect
to the wiper pin through programmable CMOS switches. The
tap position is programmed through a 3-wire up/down serial
port. The last position of the wiper is stored in a nonvolatile
memory location which is recalled at the time of power up of
the device.
The wiper moves through sequential tap positions with
inputs on the serial port. A falling edge on INC (bar) causes
the tap position to increment one position up or down based
on whether the U/D (bar) pin is held high or low.
The X9116 can be used in many applications requiring a
variable resistance. In many cases it can replace a
mechanical trimmer and offers many advantages such as
temperature and time stability as well as the reliability of a
solid state solution.
Features
Solid-state nonvolatile
16 wiper taps
3-wire up/down serial interface
V
CC
= 2.7V and 5V
Active current < 50A max.
Standby current < 1A max.
R
TOTAL
= 10k
Packages: MSOP-8, SOIC
Pb-free plus anneal available (RoHS compliant)
Pinout
Block Diagram
V
H
/R
H
V
CC
INC
U/D
1
2
3
4
8
7
6
5
X9116
SOIC/MSOP
V
SS
CS
V
L
/R
L
V
W
/R
W
Control
and
Memory
Up/Down
(U/D)
Increment
(INC)
Device Select
(CS)
V
CC
(Supply Voltage)
V
SS
(Ground)
R
H
/V
H
R
W
/V
W
R
L
/V
L
General
R
L
R
H
0
1
2
3
*
13
14
15
R
W
-R
L
Resistance
10k
9.34k
8.68k
* k
2.08k
1.42k
760
100
Data Sheet
September 12, 2005
2
FN8160.1
September 12, 2005
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 X9116
are equivalent to the fixed terminals of a mechanical
potentiometer. The minimum voltage is V
SS
and the
maximum is V
CC
.
V
W
/R
W
R
w
/R
w
is the wiper terminal and is 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 200
to
400
depending upon V
CC
.
Up/Down (U/D)
The U/D input controls the direction of the wiper movement
and whether the counter is incremented (up) or decremented
(down).
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 X9116 will be placed in
the low power standby mode until the device is selected
once again.
Principles of Operation
There are three sections of the X9116: the input control,
counter and decode section; the nonvolatile memory; and
Ordering Information
PART NUMBER
(BRAND)
PART MARKING
V
CC
LIMITS
(V)
R
TOTAL
(k
)
TEMPERATURE RANGE
(C)
PACKAGE
X9116WM8*
AAZ
5V 10%
10
0 to 70
8 Ld MSOP
X9116WM8Z* (Note)
AKY
0 to 70
8 Ld MSOP (Pb-free)
X9116WM8I*
AFL
-40 to 85
8 Ld MSOP
X9116WM8IZ* (Note)
DCG
-40 to 85
8 Ld MSOP (Pb-free)
X9116WS8*
X9116W
0 to 70
8 Ld SOIC
X9116WS8Z* (Note)
X9116W Z
0 to 70
8 Ld SOIC (Pb-free)
X9116WS8I*
X9116W I
-40 to 85
8 Ld SOIC
X9116WS8IZ* (Note)
X9116W Z I
-40 to 85
8 Ld SOIC (Pb-free)
X9116WM8-2.7*
AFK
-2.7-5.5
0 to 70
8 Ld MSOP
X9116WM8Z-2.7* (Note)
AOJ
0 to 70
8 Ld MSOP (Pb-free)
X9116WM8I-2.7*
ABA
-40 to 85
8 Ld MSOP
X9116WM8IZ-2.7* (Note)
AKS
-40 to 85
8 Ld MSOP (Pb-free)
X9116WS8-2.7*
X9116W F
0 to 70
8 Ld SOIC
X9116WS8Z-2.7* (Note)
X9116W Z F
0 to 70
8 Ld SOIC (Pb-free)
X9116WS8I-2.7*
X9116W G
-40 to 85
8 Ld SOIC
X9116WS8IZ-2.7* (Note)
X9116W Z G
-40 to 85
8 Ld SOIC (Pb-free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
*Add "T1" suffix for tape and reel.
Pin Descriptions
SYMBOL
DESCRIPTION
VH/RH
High Terminal
VW/RW
Wiper Terminal
VL/RL
Low Terminal
VSS
Ground
VCC
Supply Voltage
U/D
Up/Down Control Input
INC
Increment Control Input
CS
Chip Select Input
X9116
3
FN8160.1
September 12, 2005
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 15 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 pin.
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 electronic switches on the device 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 t
IW
(INC to V
W
change). The
R
TOTAL
value for the device can temporarily be reduced by
a significant amount if the wiper is moved several positions.
When the device is powered-down, the last wiper position
stored will be maintained in the nonvolatile memory. When
power is restored, the contents of the memory are recalled
and the wiper is set to the value last stored.
Instructions and Programming
The INC, U/D and CS inputs control the movement of the
wiper along the resistor array. With CS set LOW, the device
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 four
bit counter. The output of this counter is decoded to select
one of 16 wiper positions along the resistive array.
The value of the counter is stored in nonvolatile memory
whenever CS transitions HIGH while the INC input is also
HIGH.
The system may select the X9116, move the wiper, and
deselect the device without having to store the latest wiper
position in nonvolatile memory. After the wiper movement is
performed as described above and once the new position is
reached, the system must keep INC LOW while taking CS
HIGH. The new wiper position will be maintained until
changed by the system or until a power-up/down cycle
recalls the previously stored data.
This procedure allows 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 device and then
move the wiper up and down until the proper trim is attained.
Symbol Table
Mode Selection
CS
INC
U/D
MODE
L
H
Wiper Up
L
L
Wiper Down
H
X
Store Wiper Position
H
X
X
Standby Current
L
X
No Store, Return to Standby
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
X9116
4
FN8160.1
September 12, 2005
Absolute Maximum Ratings
Recommended Operating Conditions
Temperature under bias . . . . . . . . . . . . . . . . . . . . . .-65C to +135C
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65C to +150C
Voltage on CS, INC, U/D, V
H
/R
H
, V
L
/R
L
and V
CC
with respect to V
SS
. . . . . . . . . . . . . . . . . . . . . -1V to +7V
V = |V
H
/R
H
-V
L
/R
L
|. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
Lead temperature (soldering, 10 seconds) . . . . . . . . . . . . . . . 300
C
I
W
(10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10.0mA
Temperature Range
Commercial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to +70C
Industrial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40C to +85C
Supply Voltage (V
CC
) Limits
X9116 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V 10%
X9116-2.7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Potentiometer Specifications
Over recommended operating conditions unless otherwise stated
SYMBOL
PARAMETER
TEST CONDITIONS/NOTES
MIN
TYP
MAX
UNIT
R
TOTAL
End to end resistance variation
-20
+20
%
V
VH
V
H
/R
H
terminal voltage
V
SS
=
0V
V
SS
V
CC
V
V
VL
V
L
/R
L
terminal voltage
V
SS
= 0V
V
SS
V
CC
V
Power rating
R
TOTAL
= 10k
10
mW
R
W
Wiper resistance
I
W
= 1mA, V
CC
= 5V
200
400
R
W
Wiper resistance
I
W
= 1mA, V
CC
= 2.7V
400
1000
I
W
Wiper current
-5.0
+5.0
mA
Noise
Ref: 1kHz
-120
dBV
Hz
Resolution
6
%
Absolute linearity (Note 1)
V
w(n)(actual)
- V
w(n)(expected)
-1
+1
MI (Note 3)
Relative linearity (Note 2)
V
w(n+1)
- [V
w(n) + MI
]
-0.2
+0.2
MI
(Note 3)
R
TOTAL
temperature coefficient
300
ppm/C
Ratiometric temperature coefficient
20
ppm/C
C
H
/C
L
/C
W
Potentiometer capacitances
See Circuit #3
10/10/25
pF
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. Relative linearity is a measure of the error in step size between taps = V
W(n+1 )
-[V
w(n)
+ Ml] = 0.2 Ml.
3. 1 Ml = Minimum Increment = R
TOT
/15.
X9116
5
FN8160.1
September 12, 2005
DC Electrical Specifications
Over recommended operating conditions unless otherwise specified
SYMBOL
PARAMETER
TEST CONDITIONS
MIN TYP (Note 4)
MAX
UNIT
I
CC1
V
CC
active current (Increment)
CS = V
IL
, U/D = V
IL
or V
IH
and
INC = 0.4V/2.4V @ max t
CYC
150
A
I
CC2
VCC active current (Store) (EEPROM Store) CS = V
IH
, U/D = V
IL
or V
IH
and
INC = V
IH
@ max t
WR
400
A
I
SB
Standby supply current
CS = V
CC
0.3V, U/D and INC = V
SS
or
V
CC
0.3V
1
A
I
LI
CS, INC, U/D input leakage current
V
IN
= V
SS
to V
CC
10
A
V
IH
CS, INC, U/D input HIGH voltage
2V
V
CC
+ 0.5
V
V
IL
CS, INC, U/D input LOW voltage
-0.5
0.8
V
C
IN
(Note 5) CS, INC, U/D input capacitance
V
CC
= 5V, V
IN
= V
SS
, T
A
= 25C,
f = 1MHz
10
pF
4. Typical values are for T
A
= 25C and nominal supply voltage.
5. This parameter is periodically sampled and not 100% tested.
Endurance And Data Retention
PARAMETER
MIN
UNIT
Minimum endurance
100,000
Data changes per bit
Data retention
100
Years
Test Circuit #1
Test Circuit #2
Circuit #3 SPICE Macro Model
Test Point
V
W
/R
W
V
H
/R
H
V
L
/R
L
V
S
Force
Current
V
L
VW
V
H
/R
H
V
W
/R
W
V
L
/R
L
Test Point
C
H
C
L
R
W
10pF
10pF
R
H
R
L
R
TOTAL
C
W
25pF
A.C. Conditions of Test
Input pulse levels
0V to 3V
Input rise and fall times
10ns
Input reference levels
1.5V
X9116
6
FN8160.1
September 12, 2005
Power Up and Down Requirements
There are no restrictions on the power-up or power-down conditions of V
CC
and the voltages applied to the potentiometer pins
provided that V
CC
is always more positive than or equal to V
H
, V
L
, and V
W
, i.e., V
CC
V
H
, V
L
, V
W
. The V
CC
ramp rate spec is
always in effect.
A.C. Timing
NOTES:
6. Typical values are for T
A
= 25C and nominal supply voltage.
7. This parameter is not 100% tested.
8. MI in the A.C. timing diagram refers to the minimum incremental change in the V
W
output due to a change in the wiper position.
DC Electrical Specifications
Over recommended operating conditions unless otherwise specified
SYMBOL
PARAMETER
MIN
TYP (NOTE 6)
MAX
UNIT
t
Cl
CS to INC setup
100
ns
t
lD
INC HIGH to U/D change
100
ns
t
DI
U/D to INC setup
2.9
s
t
lL
INC LOW period
1
s
t
lH
INC HIGH period
1
s
t
lC
INC inactive to CS inactive
1
s
t
CPH
CS deselect time (STORE)
10
ms
t
IW
INC to Vw change
1
5
s
t
CYC
INC cycle time
4
s
t
R
, t
F
(Note 7)
INC input rise and fall time
500
s
t
PU
(Note 7)
Power up to wiper stable
5
s
t
R
V
CC
(Note 7)
VCC Power-up rate
15
50
mV/s
t
WR
Store cycle
5
10
ms
CS
INC
U/D
V
W
t
CI
t
IL
t
IH
t
CYC
t
ID
t
DI
t
IW
MI
(Note 8)
t
IC
t
CPH
t
F
t
R
10%
90%
90%
(store)
X9116
7
FN8160.1
September 12, 2005
Basic Configurations of Electronic Potentiometers
Basic Circuits
V
R
V
W
/R
W
V
R
I
Three terminal potentiometer;
variable voltage divider
Two terminal variable resistor;
variable current
V
H
V
L
Cascading Techniques
Buffered Reference Voltage
+
+5V
R
1
+V
5V
V
W
V
REF
V
OUT
OP-07
V
W
V
W
/R
W
+V
+V
+V
X
(a)
(b)
V
OUT
= V
W
/R
W
Noninverting Amplifier
+
V
S
V
O
R
2
R
1
V
O
= (1+R
2
/R
1
)V
S
LM308A
Voltage Regulator
R
1
R
2
I
adj
V
O
(REG) = 1.25V (1+R
2
/R
1
)+Iadj R
2
V
O
(REG)
V
IN
317
Comparator with Hysteresis
V
UL
= {R
1
/(R
1
+R
2
)} V
O
(max)
V
LL
= {R
1
/(R
1
+R
2
)} V
O
(min)
+
V
S
V
O
R
2
R
1
}
}
LT311A
+5V
-5V
(for additional circuits see AN115)
X9116
8
FN8160.1
September 12, 2005
Packaging information
0.118 0.002
(3.00 0.05)
0.040 0.002
(1.02 0.05)
0.150 (3.81)
Ref.
0.193 (4.90)
0.030 (0.76)
0.036 (0.91)
0.032 (0.81)
0.007 (0.18)
0.005 (0.13)
0.008 (0.20)
0.004 (0.10)
0.0216 (0.55)
7 Typ.
R 0.014 (0.36)
0.118 0.002
(3.00 0.05)
0.012 + 0.006 / -0.002
(0.30 + 0.15 / -0.05)
0.0256 (0.65) Typ.
8-Lead Miniature Small Outline Gull Wing Package Type M
NOTE:
1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS)
0.220"
0.0256" Typical
0.025"
Typical
0.020"
Typical
8 Places
FOOTPRINT
Ref.
X9116
9
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN8160.1
September 12, 2005
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
X9116
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