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APPLICATION NOTES
AVAILABLE
AN42 * AN44-50 * AN52 * AN53 * AN73
Terminal Voltage 5V, 32 Taps, Log Taper X9514
X9514
PushPotTM Potentiometer (Push Button Controlled)
FEATURES DESCRIPTION
The Xicor X9514 is a push button controlled, logarithmic taper potentiometer and is ideal for push button controlled resistance trimming. The X9514 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 E2 memory and then be recalled upon a subsequent poweron operation. All Xicor nonvolatile products are designed and tested for applications requiring extended endurance and data retention.
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* * *
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 --Logarithmic Taper --Wiper Positioned via Two Push Button Inputs --Slow & Fast Scan Modes --AUTOSTORE(R) Option --Manual Store Option --Wiper Position Stored in Nonvolatile Memory and Recalled on Power-Up 100 Year Wiper Position Data Retention X9514W = 10K Packages --8-Lead PDIP --8-Lead SOIC --14-Lead TSSOP
FUNCTIONAL DIAGRAM
PU PD 5-BIT UP/DOWN COUNTER 31 30 29 5-BIT EEPROM MEMORY 28 VH
ONE OF THIRTYTWO DECODER
TRANSFER GATES 2
RESISTOR ARRAY
ASE
STORE AND RECALL CONTROL CIRCUITRY
1 0 VL VW
6487 ILL F01.1
AUTOSTORE is a registered trademark of Xicor, Inc. E2POTTM and PushPotTM are trademarks of Xicor, Inc. (c)Xicor, Inc. 1994, 1995, 1996 Patents Pending 6487-3.5 7/3/96 T5/C3/D2 NS
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Characteristics subject to change without notice
X9514
PIN DESCRIPTIONS VH and VL The high (VH) and low (VL) terminals of the X9514 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 and VH references 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: VIL - AUTOSTORE is enabled. When VCC powersdown an automatic store cycle takes place. VIH - AUTOSTORE is disabled. A LOW to HIGH will initiate a manual store operation. This is for a user who wishes to connect a push button switch to this pin. For every valid push, the X9514 will store the current wiper position to the E2PROM. Typical Attenuation Characteristics (dB)
0
PU PD NC NC NC VH VSS 1 2 3 4 5 6 7 X9514 14 13 12 11 10 9 8 VCC ASE NC NC NC VL VW
6487 ILL F02.2
PIN CONFIGURATION
DIP/SOIC PU PD VH VSS 1 2 3 4 X9514 8 7 6 5 VCC ASE VL VW
TSSOP
PIN NAMES Symbol VH VW VL VSS VCC PU PD ASE NC Description High Terminal Wiper Terminal Low Terminal Ground Supply Voltage Push Up Input Push Down Input AUTOSTORE Enable Input No Connect
6487 PGM T01.2
ATTENUATION (dB)
-20
-40 -43.5
-60
31
28
24
20
16 TAP POSITION
12
8
4
0
6487 ILL F04
2
X9514
DEVICE OPERATION There are three sections of the X9514: the input control, counter and decode section; the E2PROM 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 E2PROM 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 X9514 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 switching 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 Typical circuit with ASE store pin controlled by push button switch 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 be in the fast scan mode. As soon as the button is released the X9514 will return to a standby condition. 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 E2PROM memory whenever the chip senses a powers-down of VCC 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 VSS. 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. RTOTAL with VCC Removed The end to end resistance of the array will fluctuate once VCC is removed. Typical circuit with ASE store pin used in AUTOSTORE mode
VCC
VCC 8 1 2 7 VCC PU PD ASE VH VW VL VSS 3 5 6
3.3F
8 1 2 7
VCC PU PD ASE
VSS VH VW VL
4 3 5 6
6487 ILL F05a
6487 ILL F05.2
3
X9514
ABSOLUTE MAXIMUM RATINGS* Temperature under Bias .................. -65C to +135C Storage Temperature ....................... -65C to +150C Voltage on PU, PD, ASE and VCC with Respect to VSS ........................... -1V to +7V Voltage on VH and VL Referenced to VSS V = |VH-VL| ......................................................... 10V Lead Temperature (Soldering 10 seconds) ....... 300C Wiper Current ..................................................... 1mA *COMMENT Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and 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.
ANALOG CHARACTERISTICS Electrical Characteristics End-to-End Resistance Tolerance ..................... 20% Power Rating at 25C X9514W ...................................................... 10mW Wiper Current ............................................ 1mA Max. Typical Wiper Resistance ......................... 40 at 1mA Typical Noise .......................... < -120dB/ Hz Ref: 1V Relative Variation Relative variation is a measure of the error in step size between taps = log(Vw(n)) - log(Vw(n-1)) = 0.080.05 for tap n = 2 - 31 Temperature Coefficient (-40C to +85C) X9514W ..................................... +600 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
Typical Electrical Taper
100.0% 90.0% 80.0% 70.0%
% Total Resistance
60.0% 50.0% 40.0% 30.0% 20.0% 10.0% 0.0%
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Tap
6487 ILL F08
4
31
X9514
RECOMMENDED OPERATING CONDITIONS Temperature Commercial Industrial Military Min. 0C -40C -55C Max. +70C +85C +125C
6487 PGM T03.1
Supply Voltage X9514
Limits 5V 10%
6487 PGM T04.1
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.) Limits Symbol ICC ISB ILI VIH VIL RW VVH VVL CIN(5) Parameter VCC Active Current Standby Supply Current ASE, PU, PD Input Leakage Current ASE, PU, PD Input HIGH Voltage ASE, PU, PD Input LOW Voltage Wiper Resistance VH Terminal Voltage VL Terminal Voltage ASE, PU, PD Input Capacitance Min. Typ.(4) 1 Max. 3 200 10 VCC + 1 0.8 40 -5 -5 100 +5 +5 10 Units mA A A V V V V pF Max. Wiper Current 1mA Test Conditions
PU or PD held at VIL the others at VIH
PU = PD = VH VIN = VSS to VCC
2 -1
VCC = 5V, VIN = 0V, TA = 25C, f = 1MHz
6487 PGM T05.4
STANDARD PARTS Part Number X9514W Maximum Resistance 10K Wiper Increments Log Taper Minimum Resistance 40
6487 PGM T08.1
Notes: (4) Typical values are for TA = 25C and nominal supply voltage. (5) This parameter is periodically sampled and not 100% tested.
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
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X9514
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified) Limits Symbol tGAP tDB tS SLOW tS FAST(7) tPU(7) tR Vcc(7) tASTO(7) VASTH(7) VASEND(7) Parameter Time Between Two Separate Push Button Events Debounce Time After Debounce to Wiper Change on a Slow Mode Wiper Change on a Scan Mode Power Up to Wiper Stable VCC Power-up Rate AUTOSTORE Cycle Time AUTOSTORE Threshold Voltage AUTOSTORE Cycle End Voltage Min. 0 100 25 0.2 2 4 3.5 250 50 60 375 75 500 50 Typ.(6) Max. Units s ms ms ms s mV/s ms V V
6487 PGM T07.3
AUTOSTORE Cycle Timing Diagram
5
VCC
VASTH AUTOSTORE CYCLE IN PROGRESS
VOLTS (V)
VASEND tASTO STORE TIME
TIME (ms)
6487 ILL F03.2
Notes: VASTH - AUTOSTORE threshold voltage VASEND - AUTOSTORE cycle end voltage tASTO - AUTOSTORE cycle time (6) Typical values are for TA = 25C and nominal supply voltage. (7) This parameter is periodically sampled and not 100% tested.
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X9514
Slow Mode Timing
tDB PU
tGAP
MI VW
(1)
6487 ILL F06.1
Notes: (1) MI in the A.C. timing diagram refers to the minimum incremental change in the wiper voltage.
Fast Mode Timing tDB PU
tS FAST
tS SLOW VW MI (1)
1 Second
6487 ILL F07
Notes: (1) MI in the A.C. timing diagram refers to the minimum incremental change in the wiper voltage.
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X9514
PACKAGING INFORMATION
8-LEAD PLASTIC DUAL IN-LINE PACKAGE TYPE P
0.430 (10.92) 0.360 (9.14)
0.260 (6.60) 0.240 (6.10) PIN 1 INDEX PIN 1 0.300 (7.62) REF. 0.060 (1.52) 0.020 (0.51)
HALF SHOULDER WIDTH ON ALL END PINS OPTIONAL SEATING PLANE 0.150 (3.81) 0.125 (3.18)
0.145 (3.68) 0.128 (3.25)
0.025 (0.64) 0.015 (0.38) 0.065 (1.65) 0.045 (1.14) 0.020 (0.51) 0.016 (0.41)
0.110 (2.79) 0.090 (2.29)
0.015 (0.38) MAX.
0.325 (8.25) 0.300 (7.62)
TYP. 0.010 (0.25)
0 15
NOTE: 1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH
3926 FHD F01
8
X9514
PACKAGING INFORMATION
8-LEAD PLASTIC SMALL OUTLINE GULL WING PACKAGE TYPE S
0.150 (3.80) 0.158 (4.00) PIN 1 INDEX
0.228 (5.80) 0.244 (6.20)
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)
0.050 (1.27)
0.004 (0.19) 0.010 (0.25)
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)
3926 FHD F22.1
9
X9514
PACKAGING INFORMATION
14-LEAD PLASTIC, TSSOP PACKAGE TYPE V
.025 (.65) BSC
.169 (4.3) .252 (6.4) BSC .177 (4.5)
.193 (4.9) .200 (5.1)
.047 (1.20)
.0075 (.19) .0118 (.30)
.002 (.05) .006 (.15)
.010 (.25) Gage Plane 0 - 8 .019 (.50) .029 (.75) Detail A (20X) Seating Plane
.031 (.80) .041 (1.05)
See Detail "A"
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
3926 FHD F32
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X9514
ORDERING INFORMATION
X9514X
X
X Temperature Range Blank = Commercial = 0C to +70C I = Industrial = -40C to +85C M = Military = -55C to +125C Package P = 8-Lead Plastic DIP S = 8-Lead SOIC V = 14-Lead TSSOP End to End Resistance W = 10K
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, licenses are implied. U.S. PATENTS Xicor products are covered by one or more of the following U.S. Patents: 4,263,664; 4,274,012; 4,300,212; 4,314,265; 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. 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 occurence. 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.
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