®
X9314
Terminal Voltages ±5V, 32 Taps, Log Taper
Data Sheet
September 5, 2006
FN8178.2
Single Digitally Controlled Potentiometer
(XDCP™)
The Intersil 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.
The XDCP can be used as a three-terminal potentiometer or
as a two-terminal variable resistor in a wide variety of
applications including control, parameter adjustments, and
signal processing.
Features
• Solid State Potentiometer
• 32 Taps
• 10kΩ End to End Resistance
• Three-Wire Up/Down Serial Interface
• Wiper Resistance, 40Ω Typical
• Nonvolatile Storage and Recall on Power-up of Wiper
Position Standby Current < 500µA Max (Total Package)
• V
CC
= 3V to 5.5V Operation
• 100 Year Data Retention
• Offered in 8 Ld MSOP, SOIC and PDIP Packages
• Pb-Free Plus Anneal Available (RoHS Compliant)
Block Diagram
U/D
INC
CS
5-Bit
Up/Down
Counter
31
30
29
5-Bit
Nonvolatile
Memory
28
One
of
Thirty-Two
Decoder
V
H
/R
H
Transfer
Gates
2
Resistor
Array
Store and
Recall
Control
Circuitry
V
CC
V
SS
1
0
V
L
/R
L
V
W
/R
W
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
X9314
Ordering Information
PART NUMBER
X9314WMI*
X9314WP
X9314WPI
X9314WS*
X9314WSI*
X9314WSIZ (Note)
X9314WSZ* (Note)
X9314WMI-3*
X9314WMIZ-3* (Note)
X9314WS-3*
X9314WSZ-3* (Note)
PART MARKING
14WI
X9314WP
X9314WP I
X9314W
X9314W I
X9314W ZI
X9314W Z
AAY
DEX
X9314W D
X9314W ZD
3 to 5.5
V
CC
RANGE
(V)
5 ±10%
R
TOTAL
(kΩ)
10
TEMP RANGE
(°C)
-40 to +85
0 to +70
-40 to +85
0 to +70
-40 to +85
-40 to +85
0 to +70
-40 to +85
-40 to +85
0 to +70
0 to +70
PACKAGE
8 Ld MSOP
8 Ld PDIP
8 Ld PDIP
8 Ld SOIC
8 Ld SOIC
PKG.
DWG. #
M8.118
MDP0031
MDP0031
M8.15
M8.15
8 Ld SOIC (Pb-free) M8.15
8 Ld SOIC (Pb-free) M8.15
8 Ld MSOP
M8.118
8 Ld MSOP (Pb-free) M8.118
8 Ld SOIC
M8.15
8 Ld SOIC (Pb-free) M8.15
*Add "T1" suffix for tape and reel.
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.
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 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
V
L
/R
L
and V
H
/R
H
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.
Pin Configuration
8 LD PDIP/SOIC
INC
U/D
V
H
/R
H
V
SS
1
2
3
4
X9314
8
7
6
5
V
CC
CS
V
L
/R
L
V
W
/R
W
8 LD MSOP
V
W
/R
W
V
W
/R
W
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.
V
H
/R
H
V
SS
V
W
/R
W
V
L
/R
L
1
2
3
4
X9314
8
7
6
5
U/D
INC
V
CC
CS
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.
Pin Names
SYMBOL
V
H
/R
H
V
W
/R
W
V
L
/R
L
V
SS
V
CC
U/D
INC
CS
DESCRIPTION
High Terminal
Wiper Terminal
Low Terminal
Ground
Supply Voltage
Up/Down Input
Increment Input
Chip Select 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.
2
FN8178.2
September 5, 2006
X9314
Typical Attenuation Characteristics (dB)
0
Attenuation (dB)
-20
-40
-43.5
-60
31
28
24
20
16
Tap Position
12
8
4
0
Principles of 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.
t
IW
/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 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.
Power-up and Down Requirement
The are no restrictions on the sequencing of V
CC
and the
voltages 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 1 millisecond
after V
CC
reaches its final value. The V
CC
ramp rate spec is
always in effect.
3
FN8178.2
September 5, 2006
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
CC
with respect to V
SS
. . . . . . . . . . . . . . . . . . . . . . . -1V to +7V
Voltage on V
H
/R
H
and V
L
/R
L
referenced
to V
SS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +8V
∆V
= |V
H
/R
H
- V
L
/R
L
| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10V
Lead temperature (soldering 10s) . . . . . . . . . . . . . . . . . . . . . +300°C
Wiper current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1mA
I
W
(10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±8.8mA
Recommended Operating Conditions
Temperature (Commercial) . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Temperature (Industrial). . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Supply Voltage (V
CC
) Limits
X9314. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V ± 10%
X9314-2.7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3V to 5.5V
CAUTION: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only; 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.
Potentiometer Characteristics
SYMBOL
R
TOTAL
(Over recommended operating conditions unless otherwise stated.)
LIMITS
PARAMETER
End to End Resistance Tolerance
V
H
/R
H
Terminal Voltage
TEST CONDITIONS/NOTES
MIN
TYP
MAX
±20
UNITS
%
V
V
mW
Ω
mA
dBV
-5
-5
at +25°C
I
W
= ±1mA, V
CC
= 5V
40
+5
+5
10
100
±4.4
V
VL/RL
V
L
/R
L
Terminal Voltage
Power Rating
R
W
I
W
Wiper Resistance
Wiper Current
Noise
Relative variation. Error in step size
between taps.
R
TOTAL
Temperature Coefficient
Ratiometric Temperature Coefficient
Ref: 1kHz
log (R
w(n)
) - log R
w(n - 1)
)
for -40°C to +85°C
0.07-
0.003
-120
0.07 + 0.003
±600
±20
ppm/°C
ppm/°C
C
H
/C
L
/C
W
NOTE:
Potentiometer Capacitance
See Circuit #3
10/10/25
pF
1. This parameter is periodically sampled and not 100% tested.
4
FN8178.2
September 5, 2006
X9314
DC Electrical Specifications
(Over recommended operating conditions unless otherwise specified.)
LIMITS
SYMBOL
I
CC
I
SB
I
LI
V
IH
V
IL
C
IN(3)
PARAMETER
V
CC
Active Current
Standby Supply Current
CS, INC, U/D Input Leakage Current
CS, INC, U/D Input HIGH Voltage
CS, INC, U/D Input LOW Voltage
CS, INC, U/D Input Capacitance
V
CC
= 5V, V
IN
= V
SS
, T
A
= +25°C, f = 1MHz
TEST CONDITIONS
CS = V
IL
, U/D = V
IL
or V
IH
and
INC = 0.4V/2.4V @ max. t
CYC
CS = V
CC
- 0.3V, U/D and INC = V
SS
or
V
CC
- 0.3V
V
IN
= V
SS
to V
CC
2
-1
MIN
TYP
(2)
1
MAX
3
500
±10
V
CC
+ 1
0.8
10
UNITS
mA
µA
µA
V
V
pF
Standard Parts
PART NUMBER
X9314W
NOTES:
2. Typical values are for T
A
= +25°C and nominal supply voltage.
3. This parameter is periodically sampled and not 100% tested.
MAXIMUM RESISTANCE
10kΩ
WIPER INCREMENTS
Log Taper
MINIMUM RESISTANCE
40Ω
Test Circuit #1
Test Circuit #2
V
H
/R
H
Test Point
Test Point
V
W
/R
W
V
L
/R
L
Circuit #3 SPICE Macromodel
Macro Model
V
H
/R
H
R
TOTAL
R
H
C
H
C
W
C
L
10pF
R
L
V
L
/R
L
V
W
/R
W
Force
Current
10pF
R
W
25pF
A.C. Conditions of Test
INPUT PULSE LEVELS
Input rise and fall times
Input reference levels
0V to 3V
10ns
1.5V
SYMBOL TABLE
WAVEFORM
INPUTS
Must be
steady
May change
from Low to
High
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
Mode Selection
CS
L
L
H
H
X
L
INC
U/D
H
L
X
X
X
Wiper up
Wiper down
Store wiper position
Standby
No store, return to standby
MODE
May change
from High to
Low
Don’t Care:
Changes
Allowed
N/A
5
FN8178.2
September 5, 2006
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