INTERSIL X9314WS

X9314
®
Terminal Voltages ±5V, 32 Taps, Log Taper
Data Sheet
September 15, 2005
Single Digitally Controlled Potentiometer
(XDCP™)
FN8178.1
Features
• Solid State Potentiometer
The Intersil X9314 is a solid state nonvolatile potentiometer and
is ideal for digitally controlled resistance trimming.
• 32 Taps
• 10kΩ End to End Resistance
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.
• 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)
• VCC = 3V to 5.5V Operation
• 100 Year Data Retention
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.
• Offered in MSOP, SOIC Packages
• Pb-Free Plus Anneal Available (RoHS Compliant)
Block Diagram
U/D
INC
31
5-Bit
Up/Down
Counter
CS
VH/RH
30
29
5-Bit
Nonvolatile
Memory
28
One
of
Thirty-Two
Decoder
Transfer
Gates
Resistor
Array
2
Store and
Recall
Control
Circuitry
VCC
VSS
1
0
VL/RL
VW/RW
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. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
X9314
Ordering Information
PART NUMBER
X9314WM*
PART MARKING
314W
VCC RANGE
RTOTAL
(kΩ)
TEMP RANGE
(°C)
5V ±10%
10
0 to +70
8 Ld MSOP
0 to +70
8 Ld MSOP (Pb-free)
X9314WMZ (Note)
X9314WMI*
14WI
X9314WMIZ (Note)
PACKAGE
-40 to +85
8 Ld MSOP
-40 to +85
8 Ld MSOP (Pb-free)
X9314WP
X9314WP
0 to +70
8 Ld PDIP
X9314WPI
X9314WP I
-40 to +85
8 Ld PDIP
X9314WS*
X9314W
0 to +70
8 Ld SOIC
X9314WSI*
X9314W I
-40 to +85
8 Ld SOIC
-40 to +85
8 Ld SOIC (Pb-free)
0 to +70
8 Ld SOIC (Pb-free)
0 to +70
8 Ld MSOP
0 to +70
8 Ld MSOP (Pb-free)
X9314WSIZ (Note)
X9314WSZ* (Note)
X9314W Z
X9314WM-3*
14WD
X9314WMZ-3 (Note)
X9314WMI-3*
AAY
X9314WMIZ-3 (Note)
3V to 5.5V
-40 to +85
8 Ld MSOP
-40 to +85
8 Ld MSOP (Pb-free)
X9314WP-3
X9314WP D
0 to +70
8 Ld PDIP
X9314WS-3*
X9314W D
0 to +70
8 Ld SOIC
0 to +70
8 Ld SOIC (Pb-free)
X9314WSZ-3 (Note)
*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.
2
FN8178.1
September 15, 2005
X9314
Pin Descriptions
Pin Configuration
VH/RH and VL/RL
8-Lead DIP/SOIC
The high (VH/RH) and low (VL/RL) 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
VL/RL and VH/RH 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.
INC
1
8
VCC
U/D
2
7
CS
VH/RH
3
6
VL/RL
VSS
4
5
VW/RW
X9314
8-Lead MSOP
VW/RW
VH/RH
VW/RW 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.
U/D
1
8
7
INC
6
VCC
5
CS
VSS
2
VW/RW
3
VL/RL
4
X9314
Up/Down (U/D)
The U/D input controls the direction of the wiper movement
and whether the counter is incremented or decremented.
Pin Names
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)
SYMBOL
DESCRIPTION
VH/RH
High Terminal
VW/RW
Wiper Terminal
VL/RL
Low Terminal
VSS
Ground
VCC
Supply Voltage
U/D
Up/Down Input
INC
Increment Input
CS
Chip Select Input
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.
Typical Attenuation Characteristics (dB)
Attenuation (dB)
0
-20
-40
-43.5
-60
31
28
24
20
16
12
8
4
0
Tap Position
3
FN8178.1
September 15, 2005
X9314
Principles of Operation
tIW/RTOTAL
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 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 tIW (INC to VW change). The
RTOTAL value for the device can temporarily be reduced by
a significant amount if the wiper is moved several positions.
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.
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
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 powerup/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.
4
FN8178.1
September 15, 2005
X9314
Absolute Maximum Ratings
Recommended Operating Conditions
Temperature under bias . . . . . . . . . . . . . . . . . . . . . .-65°C to +135°C
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Voltage on CS, INC, U/D, and
VCC with respect to VSS . . . . . . . . . . . . . . . . . . . . . . . -1V to +7V
Voltage on VH/RH and VL/RL referenced
to VSS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +8V
∆V = |VH/RH - VL/RL| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10V
Lead temperature (soldering 10 seconds) . . . . . . . . . . . . . . . . 300°C
Wiper current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1mA
IW (10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±8.8mA
Temperature (Commercial) . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Temperature (Industrial). . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Supply Voltage (VCC) 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
(Over recommended operating conditions unless otherwise stated.)
LIMITS
SYMBOL
RTOTAL
VVL/RL
PARAMETER
TEST CONDITIONS/NOTES
MIN
TYP
End to End Resistance Tolerance
UNITS
±20
%
VH/RH Terminal Voltage
-5
+5
V
VL/RL Terminal Voltage
-5
+5
V
10
mW
100
Ω
±4.4
mA
Power Rating
at 25°C
RW
Wiper Resistance
IW = ±1mA, VCC = 5V
IW
Wiper Current
Noise
Ref: 1kHz
Relative variation. Error in step size
between taps.
log (Rw(n)) - log Rw(n - 1))
RTOTAL Temperature Coefficient
for -40°C to +85°C
40
-120
0.070.003
Potentiometer Capacitance
dBV
0.07 + 0.003
±600
Ratiometric Temperature Coefficient
CH/CL/CW
MAX
ppm/°C
±20
See Circuit #3
10/10/25
ppm/°C
pF
NOTE:
1. This parameter is periodically sampled and not 100% tested.
Power-up and Down Requirement
The are no restrictions on the sequencing of VCC 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 VCC reaches its final value. The VCC ramp rate spec is
always in effect.
5
FN8178.1
September 15, 2005
X9314
DC Electrical Specifications
(Over recommended operating conditions unless otherwise specified.)
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP(2)
MAX
UNITS
1
3
mA
ICC
VCC Active Current
CS = VIL, U/D = VIL or VIH and
INC = 0.4V/2.4V @ max. tCYC
ISB
Standby Supply Current
CS = VCC - 0.3V, U/D and INC = VSS or
VCC - 0.3V
500
µA
ILI
CS, INC, U/D Input Leakage Current
VIN = VSS to VCC
±10
µA
VIH
CS, INC, U/D Input HIGH Voltage
2
VCC + 1
V
VIL
CS, INC, U/D Input LOW Voltage
-1
0.8
V
CIN(3)
CS, INC, U/D Input Capacitance
10
pF
VCC = 5V, VIN = VSS, TA = 25°C, f = 1MHz
Standard Parts
PART NUMBER
MAXIMUM RESISTANCE
WIPER INCREMENTS
MINIMUM RESISTANCE
X9314W
10kΩ
Log Taper
40Ω
NOTES:
2. Typical values are for TA = 25°C and nominal supply voltage.
3. This parameter is periodically sampled and not 100% tested.
Test Circuit #1
Test Circuit #2
Circuit #3 SPICE Macromodel
Macro Model
VH/RH
VH/RH
RTOTAL
Test Point
Test Point
VW/RW
RH
CH
VW/RW
Force
Current
CW
10pF
VL/RL
VL/RL
CL
RL
10pF
25pF
RW
A.C. Conditions of Test
Mode Selection
INPUT PULSE LEVELS
0V to 3V
CS
Input rise and fall times
10ns
L
H
Wiper up
Input reference levels
1.5V
L
L
Wiper down
H
X
Store wiper position
X
X
Standby
L
X
No store, return to standby
H
6
INC
U/D
MODE
FN8178.1
September 15, 2005
X9314
AC Electrical Specifications
(Over recommended operating conditions unless otherwise specified)
LIMITS
SYMBOL
PARAMETER
MIN
TYP(4)
UNITS
MAX
tCl
CS to INC Setup
100
ns
tlD
INC HIGH to U/D Change
100
ns
tDI
U/D to INC Setup
2.9
µs
tlL
INC LOW Period
1
µs
tlH
INC HIGH Period
1
µs
tlC
INC Inactive to CS Inactive
1
µs
tCPH
CS Deselect Time
20
ms
tIW
INC to VW Change
tCYC
100
INC Cycle Time
500
µs
4
µs
tR, tF(5)
tPU(5)
INC Input Rise and Fall Time
500
µs
Power-up to Wiper Stable
500
µs
tR VCC
VCC Power-up Rate
50
mV/µs
0.2
A.C. Timing
CS
tCYC
tIL
tCI
tIC
tIH
tCPH
90%
INC
tID
tDI
tF
90%
10%
tR
U/D
tIW
VW
MI (6)
NOTES:
4. Typical values are for TA = 25°C and nominal supply voltage.
5. This parameter is periodically sampled and not 100% tested.
6. MI in the A.C. timing diagram refers to the minimum incremental change in the VW output due to a change in the wiper position.
7
FN8178.1
September 15, 2005
X9314
Packaging Information
8-Lead Miniature Small Outline Gull Wing Package Type M
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.
R 0.014 (0.36)
0.118 ± 0.002
(3.00 ± 0.05)
0.030 (0.76)
0.0216 (0.55)
0.036 (0.91)
0.032 (0.81)
0.040 ± 0.002
(1.02 ± 0.05)
7° Typ.
0.008 (0.20)
0.004 (0.10)
0.0256" Typical
0.150 (3.81)
Ref.
0.193 (4.90)
Ref.
0.007 (0.18)
0.005 (0.13)
0.025"
Typical
0.220"
FOOTPRINT
0.020"
Typical
8 Places
NOTE:
1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS)
8
FN8178.1
September 15, 2005
X9314
Packaging Information
8-Lead Plastic Small Outline Gull Wing Package Type S
0.150 (3.80) 0.228 (5.80)
0.158 (4.00) 0.244 (6.20)
Pin 1 Index
Pin 1
0.014 (0.35)
0.019 (0.49)
0.188 (4.78)
0.197 (5.00)
(4X) 7°
0.053 (1.35)
0.069 (1.75)
0.004 (0.19)
0.010 (0.25)
0.050 (1.27)
0.010 (0.25)
X 45°
0.020 (0.50)
0.050"Typical
0.050"
Typical
0° - 8°
0.0075 (0.19)
0.010 (0.25)
0.250"
0.016 (0.410)
0.037 (0.937)
FOOTPRINT
0.030"
Typical
8 Places
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
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
9
FN8178.1
September 15, 2005