Digitally Controlled Potentiometer (XDCPTM) X9C102/103/104/503 FEATURES DESCRIPTION * Solid-state potentiometer * 3-wire serial interface * 100 wiper tap points --Wiper position stored in nonvolatile memory and recalled on power-up * 99 resistive elements --Temperature compensated --End to end resistance, 20% --Terminal voltages, 5V * Low power CMOS --VCC = 5V --Active current, 3mA max. --Standby current, 750A max. * High reliability --Endurance, 100,000 data changes per bit --Register data retention, 100 years * X9C102 = 1 k * X9C103 = 10 k * X9C503 = 50 k * X9C104 = 100 k * Packages --8-lead SOIC and DIP The X9Cxxx are Xicor digitally controlled (XDCP) potentiometers. The device consists of a resistor array, wiper switches, a control section, and nonvolatile memory. The wiper position is controlled by a threewire interface. The potentiometer is implemented by a resistor array composed of 99 resistive elements and a wiper switching network. Between each element and at either end are tap points accessible to the wiper terminal. 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 device 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 - signal processing BLOCK DIAGRAM U/D INC CS 7-Bit Up/Down Counter VCC (Supply Voltage) RH/VH 99 98 97 Up/Down (U/D) Increment (INC) Device Select (CS) 7-Bit Nonvolatile Memory VH/RH Control and Memory RW/VW VL/RL VSS (Ground) General VCC GND Store and Recall Control Circuitry 96 One of OneHundred Decoder 2 Transfer Gates Resistor Array 1 0 RL/VL RW/VW Detailed XDCP is a trademark of Xicor, Inc. REV 1.1.7 6/24/03 www.xicor.com 1 of 12 X9C102/103/104/503 PIN CONFIGURATION DIP/SOIC INC 1 U/D 2 VH/RH 3 VSS 4 X9C102/103/104/503 8 VCC 7 CS 6 VL/RL 5 VW/RW ORDERING INFORMATION Part Number Temperature Range Package End to End Resistance X9C102P 0C TO +70C 8-Lead Plastic DIP 1 k X9C102PI -40C TO +85C 8-Lead Plastic DIP 1 k X9C102S 0C TO +70C 8-Lead SOIC 1 k X9C102SI -40C TO +85C 8-Lead SOIC 1 k X9C103P 0C TO +70C 8-Lead Plastic DIP 10 k X9C103PI -40C TO +85C 8-Lead Plastic DIP 10 k X9C103S 0C TO +70C 8-Lead SOIC 10 k X9C103SI -40C TO +85C 8-Lead SOIC 10 k X9C104P 0C TO +70C 8-Lead Plastic DIP 100 k X9C104PI -40C TO +85C 8-Lead Plastic DIP 100 k X9C104S 0C TO +70C 8-Lead SOIC 100 k X9C104SI -40C TO +85C 8-Lead SOIC 100 k X9C503P 0C TO +70C 8-Lead Plastic DIP 50 k X9C503PI -40C TO +85C 8-Lead Plastic DIP 50 k X9C503S 0C TO +70C 8-Lead SOIC 50 k X9C503SI -40C TO +85C 8-Lead SOIC 50 k REV 1.1.7 6/24/03 www.xicor.com 2 of 12 X9C102/103/104/503 PIN DESCRIPTIONS Pin Symbol Brief Description 1 INC Increment . 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. 2 U/D Up/Down. The U/D input controls the direction of the wiper movement and whether the counter is incremented or decremented. 3 RH/VH RH/VH. The high (VH/RH) terminals of the X9C102/103/104/503 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is -5V and the maximum is +5V. The terminology of VH/RH and VL/RL 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. 4 VSS 5 VW/RW VW/RW. VW/RW is the wiper terminal, and is 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. 6 RL/VL RL/VL. The low (VL/RL) terminals of the X9C102/103/104/503 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is -5V and the maximum is +5V. The terminology of VH/RH and VL/RL 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. 7 CS 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 X9C102/103/104/503 device will be placed in the low power standby mode until the device is selected once again. 8 VCC VCC REV 1.1.7 6/24/03 VSS www.xicor.com 3 of 12 X9C102/103/104/503 ABSOLUTE MAXIMUM RATINGS COMMENT 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| X9C102 ............................................................... 4V X9C103, X9C503, and X9C104 ......................... 10V Lead temperature (soldering, 10 seconds)...... +300C IW (10 seconds) ................................................ 8.8mA 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. RECOMMENDED OPERATING CONDITIONS Temperature Min. Max. Supply Voltage (VCC) Limits Commercial 0C +70C X9C102/103/104/503 5V 10% -40C +85C Industrial POTENTIOMETER CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.) Limits Symbol Parameter Min. Typ. Max. Unit Test Conditions/Notes RTOTAL End to end resistance variation -20 +20 % VVH/RH VH terminal voltage -5 +5 V VVL/RL VL terminal voltage -5 +5 V Power rating 16 mW X9C102 Power rating 10 mW X9C103/104/503 4.4 mA 100 IW Wiper current RW Wiper resistance -4.4 40 Noise Resolution (1) Absolute linearity Relative linearity(2) -120 dBV 1 % -1 -0.2 Notes: (1) (2) (3) (4) (5) Ref. 1kHz +1 M(3) VW(n)(actual)-VW(n)(expected) +0.2 MI(3) VW(n + 1)(actual)-[VW(n) + MI] RTOTAL temperature coefficient 300 ppm/C X9C103/503/104 RTOTAL temperature coefficient 600 ppm/C X9C102 Ratiometric temperature coefficient CH/CL/CW Wiper Current = 1mA Potentiometer capacitances 20 10/10/25 ppm/C pF See Circuit #3, Macro Model Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = [VW(n)(actual)-VW(n)(expected )] = 1 MI Maximum. Relative linearity is a measure of the error in step size between taps = VW(n + 1)-[VW(n) + MI] = +0.2 MI. 1 MI = Minimum Increment = RTOT/99 Typical values are for TA = 25C and nominal supply voltage. This parameter is not 100% tested. REV 1.1.7 6/24/03 www.xicor.com 4 of 12 X9C102/103/104/503 D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.) Limits Symbol Parameter Min. Typ.(4) Max. Unit 1 3 mA CS = VIL, U/D = VIL or VIH and INC = 0.4V to 2.4V @ max. tCYC 200 750 A CS = VCC - 0.3V, U/D and INC = VSS or VCC - 0.3V 10 A VIN = VSS to VCC ICC VCC active current ISB Standby supply current ILI CS, INC, U/D input leakage current VIH CS, INC, U/D input HIGH voltage 2 VCC + 1 V VIL CS, INC, U/D input LOW voltage -1 0.8 V 10 pF CIN(2) CS, INC, U/D input capacitance Test Conditions VCC = 5V, VIN = VSS, TA = 25C, f = 1MHz ENDURANCE AND DATA RETENTION Parameter Min. Unit Minimum endurance 100,000 Data changes per bit per register Data retention 100 years Test Circuit #1 Test Circuit #2 Test Circuit #3 Macro Model VH/RH V R/R H Test Point VS Test Point V W /R W V L /R L VW/RW Force Current VL/RL RTOTAL RH RL CL 10pF CH CW 10pF 25pF RW REV 1.1.7 6/24/03 www.xicor.com 5 of 12 X9C102/103/104/503 A.C. CONDITIONS OF TEST Input pulse levels 0V to 3V Input rise and fall times 10ns Input reference levels 1.5V A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified) Symbol Parameter Limits Typ.(6) Min. Max. Unit tCl CS to INC setup 100 ns tlD INC HIGH to U/D change 100 ns tDI U/D to INC setup 2.9 s tlL INC LOW period 1 s tlH INC HIGH period 1 s tlC INC inactive to CS inactive 1 s tCPH CS deselect time (STORE) 20 ms tCPH CS deselect time (NO STORE) 100 ns tIW INC to VW/RW change tCYC 100 500 s INC input rise and fall time 500 s Power up to wiper stable 500 s 50 V/ms INC cycle time tR, tF(7) tPU(7) (7) tR VCC 4 VCC power-up rate s 0.2 POWER UP AND DOWN REQUIREMENTS At all times, voltages on the potentiometer pins must be less than VCC. The recall of the wiper position from nonvolatile memory is not in effect until the VCC supply reaches its final value. The VCC ramp rate spec is always in effect. A.C. TIMING CS tCYC tCI tIL tIC tIH tCPH 90% 90% 10% INC tID tDI tF tR U/D tIW VW MI (8) Notes: (6) Typical values are for TA = 25C 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 VW output due to a change in the wiper position. REV 1.1.7 6/24/03 www.xicor.com 6 of 12 X9C102/103/104/503 PIN NAMES DETAILED PIN DESCRIPTIONS RH/VH and RL/VL The high (VH/RH) and low (VL/RL) terminals of the X9C102/103/104/503 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is -5V and the maximum is +5V. The terminology of VH/RH and VL/RL 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. Symbol RW/VW VW/RW is the wiper terminal, and is 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. 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. 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 X9C102/103/104/503 device will be placed in the low power standby mode until the device is selected once again. PIN CONFIGURATION INC 1 8 VCC U/D 2 7 CS VH/RH 3 6 VL/RL VSS 4 5 VW/RW REV 1.1.7 6/24/03 VH /RH High Terminal VW/RW Wiper Terminal VL/RL Low Terminal VSS Ground VCC Supply Voltage U/D Up/Down Control Input INC Increment Control Input CS Chip Select Control Input NC No Connection PRINCIPLES OF OPERATION There are three sections of the X9Cxxx: 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 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 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 electronic switches on the device 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/RW change). The RTOTAL value for the device can temporarily be reduced by a significant amount if the wiper is moved several positions. When the device is powered-down, the last wiper position stored will be maintained in the nonvolatile memory. When power is restored, the contents of the memory are recalled and the wiper is set to the value last stored. DIP/SOIC X9C102/103/104/503 Description www.xicor.com 7 of 12 X9C102/103/104/503 INSTRUCTIONS AND PROGRAMMING MODE SELECTION The INC, U/D and CS inputs control the movement of the wiper along the resistor array. With CS set LOW the device 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. CS U/D Mode L H Wiper Up L L Wiper Down H X Store Wiper Position X X Standby Current L X No Store, Return to Standby L H Wiper Up (not recommended) L L Wiper Down (not recommended) H The value of the counter is stored in nonvolatile memory whenever CS transitions HIGH while the INC input is also HIGH. The system may select the X9Cxxx, move the wiper, and deselect the device without having to store the latest wiper position in nonvolatile memory. After the wiper movement is performed as described above and once the new position is reached, the system must keep INC LOW while taking CS HIGH. The new wiper position will be maintained until changed by the system or until a power-down/up cycle recalled the previously stored data. INC SYMBOL TABLE WAVEFORM This procedure allows 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... 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 N/A Changing: State Not Known Center Line is High Impedance The state of U/D may be changed while CS remains LOW. This allows the host system to enable the device and then move the wiper up and down until the proper trim is attained. REV 1.1.7 6/24/03 www.xicor.com 8 of 12 X9C102/103/104/503 PERFORMANCE CHARACTERISTICS Contact the factory for more information. APPLICATIONS INFORMATION Electronic digitally controlled (XCDP) potentiometers provide three powerful application advantages; (1) the variability and reliability of a solid-state potentiometer, (2) the flexibility of computer-based digital controls, and (3) the retentivity of nonvolatile memory used for the storage of multiple potentiometer settings or data. Basic Configurations of Electronic Potentiometers VR VR VH/RH VW/RW VL/RL I Three terminal potentiometer; variable voltage divider Two terminal variable resistor; variable current Basic Circuits Buffered Reference Voltage Noninverting Amplifier Cascading Techniques R1 +V +5V +V VS +V +5V VW VREF + VOUT R2 R1 VW/RW VOUT = VW/RW (a) Voltage Regulator (b) VO = (1+R2/R1)VS Offset Voltage Adjustment R1 VO (REG) Comparator with Hysteresis R2 VS VS LT311A - + VO 100K R1 - VO + } TL072 R2 } Iadj R1 R2 10K 10K 10K VO (REG) = 1.25V (1+R2/R1)+Iadj R2 +12V REV 1.1.7 6/24/03 -5V X VW/RW +V -5V 317 VO - OP-07 - VIN LM308A + -12V www.xicor.com VUL = {R1/(R1+R2)} VO(max) VLL = {R1/(R1+R2)} VO(min) (for additional circuits see AN115) 9 of 12 X9C102/103/104/503 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. Half Shoulder Width On All End Pins Optional 0.145 (3.68) 0.128 (3.25) Seating Plane 0.025 (0.64) 0.015 (0.38) 0.065 (1.65) 0.045 (1.14) 0.150 (3.81) 0.125 (3.18) 0.110 (2.79) 0.090 (2.29) .073 (1.84) Max. 0.060 (1.52) 0.020 (0.51) 0.020 (0.51) 0.016 (0.41) 0.325 (8.25) 0.300 (7.62) 0 15 Typ. 0.010 (0.25) NOTE: 1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH REV 1.1.7 6/24/03 www.xicor.com 10 of 12 X9C102/103/104/503 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) - REV 1.1.7 6/24/03 www.xicor.com 11 of 12 X9C102/103/104/503 LIMITED WARRANTY (c)Xicor, Inc. 2003 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, BiasLock 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. REV 1.1.7 6/24/03 www.xicor.com Characteristics subject to change without notice. 12 of 12