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X9314
Terminal Voltages 5V, 32 Taps, Log Taper
Data Sheet September 15, 2005 FN8178.1
Single Digitally Controlled Potentiometer (XDCPTM)
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 * 10k End to End Resistance * Three-Wire Up/Down Serial Interface * Wiper Resistance, 40 Typical * Nonvolatile Storage and Recall on Power-up of Wiper Position Standby Current < 500A Max (Total Package) * VCC = 3V to 5.5V Operation * 100 Year Data Retention * Offered in MSOP, SOIC Packages * Pb-Free Plus Anneal Available (RoHS Compliant)
Block Diagram
U/D INC CS 5-Bit Up/Down Counter 31 30 29 28 One of Thirty-Two Decoder VH/RH
5-Bit Nonvolatile Memory
Transfer Gates 2
Resistor Array
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* X9314WMZ (Note) X9314WMI* X9314WMIZ (Note) X9314WP X9314WPI X9314WS* X9314WSI* X9314WSIZ (Note) X9314WSZ* (Note) X9314WM-3* X9314WMZ-3 (Note) X9314WMI-3* X9314WMIZ-3 (Note) X9314WP-3 X9314WS-3* 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. X9314WP D X9314W D AAY X9314W Z 14WD 3V to 5.5V X9314WP X9314WP I X9314W X9314W I 14WI PART MARKING 314W VCC RANGE 5V 10% RTOTAL (k) 10 TEMP RANGE (C) 0 to +70 0 to +70 -40 to +85 -40 to +85 0 to +70 -40 to +85 0 to +70 -40 to +85 -40 to +85 0 to +70 0 to +70 0 to +70 -40 to +85 -40 to +85 0 to +70 0 to +70 0 to +70 PACKAGE 8 Ld MSOP 8 Ld MSOP (Pb-free) 8 Ld MSOP 8 Ld MSOP (Pb-free) 8 Ld PDIP 8 Ld PDIP 8 Ld SOIC 8 Ld SOIC 8 Ld SOIC (Pb-free) 8 Ld SOIC (Pb-free) 8 Ld MSOP 8 Ld MSOP (Pb-free) 8 Ld MSOP 8 Ld MSOP (Pb-free) 8 Ld PDIP 8 Ld SOIC 8 Ld SOIC (Pb-free)
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FN8178.1 September 15, 2005
X9314 Pin Descriptions
VH/RH and VL/RL
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 U/D VH/RH VSS
Pin Configuration
8-Lead DIP/SOIC 1 2 3 4 X9314 8 7 6 5 VCC CS VL/RL VW/RW
VW/RW
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 40.
8-Lead MSOP VH/RH VSS VW/RW VL/RL 1 2 3 4 X9314 8 7 6 5 U/D INC VCC 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 VH/RH VW/RW VL/RL VSS VCC 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.
Typical Attenuation Characteristics (dB)
0
Attenuation (dB)
-20
-40 -43.5
-60
31
28
24
20
16 Tap Position
12
8
4
0
3
FN8178.1 September 15, 2005
X9314 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.
tIW/RTOTAL
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.
SYMBOL TABLE
WAVEFORM INPUTS Must be steady May change from Low to High May change from High to Low Don't Care: Changes Allowed N/A 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
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.
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FN8178.1 September 15, 2005
X9314
Absolute Maximum Ratings
Temperature under bias . . . . . . . . . . . . . . . . . . . . . .-65C to +135C Storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65C to +150C 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) . . . . . . . . . . . . . . . . 300C Wiper current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1mA IW (10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.8mA
Recommended Operating Conditions
Temperature (Commercial) . . . . . . . . . . . . . . . . . . . . . 0C to +70C Temperature (Industrial). . . . . . . . . . . . . . . . . . . . . . .-40C to +85C 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
SYMBOL RTOTAL
(Over recommended operating conditions unless otherwise stated.) LIMITS
PARAMETER End to End Resistance Tolerance VH/RH Terminal Voltage
TEST CONDITIONS/NOTES
MIN
TYP
MAX 20
UNITS % V V mW mA dBV
-5 -5 at 25C IW = 1mA, VCC = 5V 40
+5 +5 10 100 4.4
VVL/RL
VL/RL Terminal Voltage Power Rating
RW IW
Wiper Resistance Wiper Current Noise Relative variation. Error in step size between taps. RTOTAL Temperature Coefficient Ratiometric Temperature Coefficient
Ref: 1kHz log (Rw(n)) - log Rw(n - 1)) for -40C to +85C 0.070.003
-120 0.07 + 0.003 600 20
ppm/C ppm/C
CH/CL/CW NOTE:
Potentiometer Capacitance
See Circuit #3
10/10/25
pF
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.
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FN8178.1 September 15, 2005
X9314
DC Electrical Specifications
SYMBOL ICC ISB ILI VIH VIL CIN(3) (Over recommended operating conditions unless otherwise specified.) LIMITS PARAMETER VCC 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 VCC = 5V, VIN = VSS, TA = 25C, f = 1MHz TEST CONDITIONS CS = VIL, U/D = VIL or VIH and INC = 0.4V/2.4V @ max. tCYC CS = VCC - 0.3V, U/D and INC = VSS or VCC - 0.3V VIN = VSS to VCC 2 -1 MIN TYP(2) 1 MAX 3 500 10 VCC + 1 0.8 10 UNITS mA A A V V pF
Standard Parts
PART NUMBER X9314W NOTES: 2. Typical values are for TA = 25C and nominal supply voltage. 3. This parameter is periodically sampled and not 100% tested. MAXIMUM RESISTANCE 10k WIPER INCREMENTS Log Taper MINIMUM RESISTANCE 40
Test Circuit #1
Test Circuit #2
VH/RH Test Point
Circuit #3 SPICE Macromodel
Macro Model
VH/RH
RTOTAL RH CH CW CL 10pF RL
Test Point VW/RW VL/RL
VW/RW Force Current VL/RL
10pF RW
25pF
A.C. Conditions of Test
INPUT PULSE LEVELS Input rise and fall times Input reference levels 0V to 3V 10ns 1.5V
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
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FN8178.1 September 15, 2005
X9314
AC Electrical Specifications
SYMBOL tCl tlD tDI tlL tlH tlC tCPH tIW tCYC tR, tF(5) tPU(5) tR VCC CS to INC Setup INC HIGH to U/D Change U/D to INC Setup INC LOW Period INC HIGH Period INC Inactive to CS Inactive CS Deselect Time INC to VW Change INC Cycle Time INC Input Rise and Fall Time Power-up to Wiper Stable VCC Power-up Rate 0.2 4 500 500 50 (Over recommended operating conditions unless otherwise specified) LIMITS PARAMETER MIN 100 100 2.9 1 1 1 20 100 500 TYP(4) MAX UNITS ns ns s s s s ms s s s s mV/s
A.C. Timing
CS tCYC tCI INC tIL tIH
tIC
tCPH 90% 90% 10%
tID U/D
tDI
tF
tR
tIW VW NOTES: 4. Typical values are for TA = 25C and nominal supply voltage. 5. This parameter is periodically sampled and not 100% tested.
MI (6)
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.
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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)
7 Typ.
0.040 0.002 (1.02 0.05)
0.008 (0.20) 0.004 (0.10)
0.0256" Typical
0.007 (0.18) 0.005 (0.13)
0.150 (3.81) Ref. 0.193 (4.90) Ref.
0.025" Typical 0.220"
FOOTPRINT
0.020" Typical 8 Places
NOTE: 1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS)
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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 - 8 0.0075 (0.19) 0.010 (0.25) 0.016 (0.410) 0.037 (0.937) 0.250"
0.050" Typical
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

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