X9312 XICOR | Alldatasheet
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©Xicor, Inc. 1994, 1995 Patents Pending Characteristics subject to change without notice 3865-2.4 12/1/95 T1/C0/D0 NS E2POT™ is a trademark of Xicor, Inc.
DESCRIPTION
The Xicor X9312 is a solid state nonvolatile potentiom- eter and is ideal for digitally controlled resistance trim- ming. The X9312 is a resistor array composed of 99 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 nonvola- tile memory and then be recalled upon a subsequent power-up operation. The resolution of the X9312 is equal to the maximum resistance value divided by 99. As an example, for the X9312U (50KΩ ) each tap point represents 505Ω . All Xicor nonvolatile memories are designed and tested for applications requiring extended endurance and data retention.
FEATURES
- Compatible with X9C102/103/104/503
- Low Power CMOS —Active Current, 3mA Max —Standby Current, 1mA Max
- 99 Resistive Elements —Temperature Compensated ±20% End to End Resistance Range — 0 to +15V Range
- 100 Wiper Tap Points —Wiper Positioned via Three-Wire Interface —Similar to TTL Up/Down Counter —Wiper Position Stored in Nonvolatile Memory and Recalled on Power-Up
- 100 Year Wiper Position Data Retention
- X9312Z = 1KΩ
- X9312W = 10KΩ
- X9312U = 50KΩ
- X9312T = 100KΩ FUNCTIONAL DIAGRAM 7-BIT UP/DOWN COUNTER 7-BIT NONVOLATILE MEMORY STORE AND RECALL CONTROL CIRCUITRY ONE OF ONE- HUNDRED DECODER RESISTOR ARRAY VL VW VH U/D INC CS VCC GND TRANSFER GATES
3865 FHD F01
E2POT™ Nonvolatile Digital Potentiometer X9312 Terminal Voltage 0V to +15V, 100 Taps A PPLICA TION NOTES A V AILABLE AN42 • AN44–48 • AN50 • AN52 • AN53 • AN71 • AN73
The high (VH ) and low (VL) terminals of the X9312 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is 0V and the maximum is +15V. It should be noted that the terminology of V L and VH 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. V W Vw 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 . Up/Down (U/D) The U/D input controls the direction of the wiper move- ment 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. 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 X9312 will be placed in the low power standby mode until the device is selected once again. PIN CONFIGURATION PIN NAMES Symbol Description VH High Terminal VW Wiper Terminal VL Low Terminal VSS Ground VCC Supply Voltage U/D Up/Down Input INC Increment Input CS Chip Select Input
3865 PGM T01
3863 FHD F02.1 INC U/D VH VSS X9312 DIP/SOIC
There are three sections of the X9312: the input control, counter and decode section; the nonvolatile memory; and the resistor array. The input control section oper- ates 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 re- tained for future use. The resistor array is comprised of 99 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 X9312 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 seven bit counter. The output of this counter is decoded to select one of one-hundred 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 X9312 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 X9312, 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 the keep 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 X9312 and then move the wiper up and down until the proper trim is attained. T IW/RTOTAL The electronic switches on the X9312 operate in a “make before break” mode when the wiper changes tap positions. If the wiper is moved several positions mul- tiple taps are connected to the wiper for t IW (INC to VW change). The RTOTAL value for the device can tempo- rarily be reduced by a significant amount if the wiper is moved several positions. R TOTAL with VCC Removed The end to end resistance of the array will fluctuate once VCC is removed. 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
ABSOLUTE MAXIMUM RATINGS* Voltage on CS, INC, U/D and VCC Voltage on VH and VL Referenced to VSS ΔV = |VH –VL| *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 specifica- tion is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ANALOG CHARACTERISTICS
Electrical Characteristics
Power Rating at 25°C Hz Ref: 1V Resolution Linearity Temperature Coefficient (–40°C to +85°C) X9312W, X9312U and Wiper Adjustability Unlimited Wiper Adjustment (Non-Store operation) Data Changes Physical Characteristics Marking Includes Manufacturer’s Trademark Resistance Value or Code Date Code Test Circuit #1 Test Circuit #2
3865 FHD F04 3865 FHD F05
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 /99. (3) Relative Linearity is a measure of the error in step size between taps = VW(n+1) – [Vw(n) + Ml] = +0.2 Ml.
RECOMMENDED OPERATING CONDITIONS Temperature Min. Max. Commercial 0 °C +70 °C Industrial –40 °C +85 °C Military –55 °C +125 °C 3865 PGM T03.1 Supply Voltage Limits X9312 5V ±10% 3865 PGM T04.1 D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.) Limits Symbol Parameter Min. Typ. (4) Max. Units Test Conditions ICC VCC Active Current 1 3 mA CS = VIL, U/D = VIL or VIH and INC = 0.4V/2.4V @ max. tCYC ISB Standby Supply Current 500 1000 µA CS = VCC – 0.3V, U/D and INC = VSS or VCC – 0.3V ILI CS, INC, U/D Input ±10 µAV IN = VSS to VCC Leakage Current VIH CS, INC, U/D Input 2 V CC + 1 V HIGH Voltage VIL CS, INC, U/D Input –1 0.8 V LOW Voltage R W Wiper Resistence 40 100 Ω Max. Wiper Current ±1mA VVH VH Terminal Voltage 0 15 V VVL VL Terminal Voltage 0 15 V C IN(5) CS, INC, U/D Input 10 pF V CC = 5V, VIN = VSS , Capacitance T A = 25°C, f = 1MHz 3865 PGM T05.3 STANDARD PARTS Part Number Maximum Resistance Wiper Increments Minimum Resistance X9312Z 1K Ω 10.1Ω 40Ω X9312W 10K Ω 101Ω 40Ω X9312U 50K Ω 505Ω 40Ω X9312T 100K Ω 1010Ω 40Ω 3865 PGM T08.1Notes: (4) Typical values are for TA = 25°C and nominal supply voltage. (5) This parameter is periodically sampled and not 100% tested.
A.C. CONDITIONS OF TEST Input Pulse Levels 0V to 3V Input Rise and Fall Times 10ns Input Reference Levels 1.5V 3865 PGM T05.1 MODE SELECTION CS INC U/D Mode L H Wiper Up L L Wiper Down H X Store Wiper Position H X X Standby L X No Store, Return to Standby
3865 PGM T06
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified) Limits Symbol Parameter Min. Typ. (6) Max. Units tCl CS to INC Setup 100 ns tlD INC HIGH to U/D Change 100 ns tDI U/D to INC Setup 1 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 100 500 µs tCYC INC Cycle Time 4 µs tR, tF(7) INC Input Rise and Fall Time 500 µs tPU (7) Power up to Wiper Stable 500 µs tR VCC (7) VCC Power-up Rate 0.2 50 mV/ µs 3865 PGM T07.4 A.C. Timing
3865 FHD F03
Notes: (6) Typical values are for TA = 25°C and nominal supply voltage. (7) This parameter is periodically sampled and not 100% tested. (8) MI in the A.C. timing diagram refers to the minimum incremental change in the V W output due to a change in the wiper position. CS INC U/D VW tCI tIL tIH tCYC tID tDI tIW MI (8) tIC tCPH tF tR 10% 90% 90%
0.020 (0.51) 0.016 (0.41) 0.150 (3.81) 0.125 (3.18) 0.325 (8.25) 0.300 (7.62) 0.110 (2.79) 0.090 (2.29) 0.430 (10.92) 0.360 (9.14) 0.300 (7.62) REF. PIN 1 INDEX 0.140 (3.56) 0.130 (3.30) 0.020 (0.51) 0.015 (0.38)
3926 FHD F01
0.062 (1.57) 0.058 (1.47) 0.255 (6.47) 0.020 (0.51) TYP. 0.010 (0.25) 15° NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 0.092 (2.34) DIA. NOM. HALF SHOULDER WIDTH ON ALL END PINS OPTIONAL 0.015 (0.38) MAX. PACKAGING INFORMATION 8-LEAD PLASTIC DUAL IN-LINE PACKAGE TYPE P NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
0.150 (3.80) 0.158 (4.00) 0.228 (5.80) 0.244 (6.20) 0.014 (0.35) 0.019 (0.49) PIN 1 PIN 1 INDEX 0.010 (0.25) 0.020 (0.50) 0.050 (1.27) 0.188 (4.78) 0.197 (5.00) 0.004 (0.19) 0.010 (0.25) 0.053 (1.35) 0.069 (1.75) (4X) 7° 0.027 (0.683) 0.037 (0.937) 0.0075 (0.19) 0.010 (0.25) 0° – 8° X 45°
3926 FHD F22
8-LEAD PLASTIC SMALL OUTLINE GULL WING PACKAGE TYPE S NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESIS IN MILLIMETERS)
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. Temperature Range Blank = Commercial = 0°C to +70°C I = Industrial = –40°C to +85°C M = Military = –55°C to +125°C Package P = 8-Lead Plastic DIP S = 8-Lead SOIC End to End Resistance Z = 1KΩ W = 10KΩ U = 50KΩ T = 100KΩ X9312X X X