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APPLICATION NOTES AVAILABLE
AN99 * AN115 * AN120 * AN124 * AN133 * AN134 * AN135
Terminal Voltage 5V, 32 Taps
X9511
Single Digitally-Controlled (XDCPTM) Potentiometer (Push Button Controlled)
FEATURES * 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 --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 * X9511W = 10K * Packages --8-lead PDIP --8-lead SOIC DESCRIPTION The Xicor X9511 is a push button controlled potentiometer that is ideal for push button controlled resistance trimming. The X9511 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 power-on operation. The resolution of the X9511 is equal to the maximum resistance value divided by 31. As an example, for the X9511W (10K) each tap point represents 323. All Xicor nonvolatile products are designed and tested for applications requiring extended endurance and data retention.
BLOCK DIAGRAM
PU PD 5-Bit Up/Down Counter
31 30 29
VH
5-Bit EEPROM Memory
28 One of Thirty-Two Decoder 2
Transfer Gates
Resistor Array
ASE
Store and Recall Control Circuitry
1 0 VL VW
AUTOSTORE is a registered trademark of Xicor, Inc.
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X9511
PIN DESCRIPTIONS VH/RH and VL/RL The high (VH/RH) and low (VL/RL) terminals of the X9511 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 reference 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 powers down, an automatic store cycle takes place. VIH--AUTOSTORE is disabled. A LOW to HIGH will initiate a manual store operation. This is for the user who wishes to connect a push button switch to this pin. For every valid push, the X9511 will store the current wiper position to the EEPROM. PIN CONFIGURATION
DIP/SOIC PU PD VH VSS 1 2 3 4 X9511 8 7 6 5 VCC ASE VL VW
PIN NAMES Symbol
VH/RH VW/RW VL/RL VSS VCC PU PD ASE
Description
High Terminal Wiper Terminal Low Terminal Ground Supply Voltage Push Up Input Push Down Input AUTOSTORE Enable Input
DEVICE OPERATION There are three sections of the X9511: the input control, counter and decode section; the EEPROM 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 EEPROM 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 X9511 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 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 go into the fast scan mode. As soon as the button is released the X9511 will return to a standby condition.
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X9511
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 EEPROM memory whenever the chip senses a power-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 powerup and then taken LOW, the wiper will not respond to the PU or PD inputs until ASE is brought HIGH and held HIGH. Figure 1. Typical circuit with ASE store pin controlled by push button switch
VCC 8 1 2 7 VCC PU PD ASE VH VW VL VSS 3 5 6 8 1 2 7 VCC PU PD ASE VSS VH VW VL 4 3 5 6
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.
Figure 2. Typical circuit with ASE store pin used in AUTOSTORE mode
VCC 3.3F
2K
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X9511
ABSOLUTE MAXIMUM RATINGS Temperature under bias ....................-65C to +135C Storage temperature .........................-65C to +150C Voltage on PU, PD, and VCC with respect to VSS.................................. -1V to +7V Voltage on VH and VL referenced to VSS.................................... -8V to +8V V = |VH-VL| X9511W ............................................................. 10V Lead temperature (soldering 10 seconds)..........300C Wiper current ............................................................1mA ANALOG CHARACTERISTICS Electrical Characteristics End-to-end resistance tolerance .......................... 20% Power rating at 25C X9511W ......................................................... 10mW Wiper current ................................................. 1mA Max. Typical wiper resistance ...........................40 at 1mA Typical noise ............................ < -120dB/Hz Ref: 1V Resolution Resistance ............................................................ 3% Linearity Absolute linearity(1) ............................................1.0 Ml(2) Relative linearity(3) .............................................0.2 Ml(2)
Notes: (1) Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = (Vw(n)(actual)-Vw(n)(expected)) = 1 Ml Maximum. (2) 1 Ml = Minimum Increment = RTOT/31. (3) Relative linearity is a measure of the error in step size between taps = VW(n+1)- [Vw(n) + Ml] = +0.2 Ml
COMMENT Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only; 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. Temperature Coefficient -40C to +85C X9511W ...................................... +300 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
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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X9511
RECOMMENDED OPERATING CONDITIONS Temperature
Commercial Industrial
Min.
0C -40C
Max.
+70C +85C
Supply Voltage
X9511
Limits
5V 10%
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.) Limits Symbol
ICC ISB ILI VIH VlL RW VVH VVL CIN
(5)
Parameter
VCC active current Standby supply current PU, PD, ASE input leakage current PU, PD, ASE input HIGH voltage PU, PD, ASE input LOW voltage Wiper resistance VH terminal voltage VL terminal voltage ASE, PU, PD input capacitance
Min.
Typ.(4)
1 100
Max.
3 200 10 VCC + 1 0.8
Unit
mA A A V V V V pF
Test Conditions
PU or PD held at VIL the other at VIH PU = PD = VIH VIN = VSS to VCC
2 -1 40 -5 -5
100 +5 +5 10
Max. Wiper Current 1mA
VCC = 5V, VIN = 0V, TA = 25C, f = 1MHz
Notes: (4) Typical values are for TA = 25C and nominal supply voltage. (5) This parameter is periodically sampled and not 100% tested.
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.) Limits Symbol
tGAP tDB tS SLOW tS FAST tPU
(7) (7) (7)
Parameter
Time between two separate push button events Debounce time After debounce to wiper change on a slow mode Wiper change on a fast mode Power up to wiper stable VCC power-up rate AUTOSTORE cycle time AUTOSTORE threshold voltage AUTOSTORE cycle end voltage
Min.
0
Typ.(6)
30
Max.
60 375 75 500 50
Unit s
ms ms ms
100 25 0.2 2
250 50
s
mV/s ms V V
tR VCC tASTO
(7)
VASTH(7) VASEND
(7)
4 3.5
POWER UP AND DOWN REQUIREMENTS The are no restrictions on the sequencing of VCC and the voltage 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 1ms after VCC reaches its final value. The VCC ramp rate spec is always in effect.
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X9511
AUTOSTORE Cycle Timing Diagram
5
VCC VASTH Autos Cycle in Progress
Volts (V)
VASEND tASTO Store Time
Time (ms)
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.
Slow Mode Timing
tDB PU tGAP
MI(1) VW
Note:
(1) MI in the A.C. timing diagram refers to the minimum incremental change in the wiper voltage.
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X9511
Fast Mode Timing
tDB PU
tS FAST
tS SLOW
VW
MI(1) 1 Second
Note:
(1) MI in the A.C. timing diagram refers to the minimum incremental change in the wiper voltage.
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X9511
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)
.073 (1.84) 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
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X9511
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)
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X9511
ORDERING INFORMATION X9511X X X Temperature Range Blank = Commercial = 0C to +70C I = Industrial = -40C to +85C Package P = 8-Lead Plastic DIP S = 8-Lead SOIC End to End Resistance W = 10K
LIMITED WARRANTY
(c)Xicor, Inc. 2000 Patents Pending
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, or licenses are implied. TRADEMARK DISCLAIMER: Xicor and the Xicor logo are registered trademarks of Xicor, Inc. AutoStore, Direct Write, Block Lock, SerialFlash, MPS, and XDCP are also trademarks of Xicor, Inc. All others belong to their respective owners. U.S. PATENTS Xicor products are covered by one or more of the following U.S. Patents: 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; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084,667; 5,153,880; 5,153,691; 5,161,137; 5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. 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 occurrence. 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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Characteristics subject to change without notice.
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