X9C303 ® Terminal Voltage ±5V, 100 Taps, Log Taper Data Sheet March 11, 2005 Digitally Controlled Potentiometer (XDCP™) FN8223.0 DESCRIPTION The Intersil X9C303 is a digitally controlled potentiometer (XDCP). The device consists of a resistor array, wiper switches, a control section, and nonvolatile memory. The wiper position is controlled by a threewire interface. FEATURES • Solid-state potentiometer • Three-wire serial interface • 100 wiper tap points —Wiper position stored in nonvolatile memory and recalled on power-up • 99 resistive elements, log taper —Temperature compensated —End to end resistance, ±15% —Terminal voltages, ±5V • Low power CMOS —VCC = 5V —Active current, 3mA max. —Standby current, 750µA max. • High reliability —Endurance, 100,000 data changes per bit —Register data retention, 100 years • X9C303, 32kΩ • Packages —8-lead TSSOP —8-lead SOIC —8-pin DIP The resistor array is composed of 99 resistive elements. 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 ranging from control, to signal processing, to parameter adjustment. Digitallycontrolled 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 use of nonvolatile memory for potentiometer settings retention. BLOCK DIAGRAM U/D INC CS 7-Bit Up/Down Counter 99 RH/VH 98 97 7-Bit Nonvolatile Memory 96 One of OneHundred Decoder Transfer Gates Resistor Array 2 VCC VSS Store and Recall Control Circuitry 1 0 RL/VL RW/VW 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-352-6832 | 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. X9C303 PIN NAMES PIN DESCRIPTIONS Symbol VH and VL The high (VH) and low (VL) terminals of the device 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 U/D input and not the voltage potential on the terminal. Description VH High Terminal (Potentiometer) VW Wiper Terminal (Potentiometer) VL Low Terminal (Potentiometer) VSS Ground VCC Supply Voltage U/D Up/Down Control Input INC Increment Control Input VW CS Chip Select Control Input 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. NC No Connection POTENTIOMETER RELATIONSHIPS S100 VH (VS) Up/Down (U/D) The U/D input controls the direction of the wiper movement and whether the counter is incriminated or decremented. R99 S99 R98 S98 VW 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 device will be placed in the low power standby mode until the device is selected once again. S3 R2 S2 R1 S1 VL R1 + R2 + . . . + Ri VW G i = 20Log ------------------------------------------------- = --------- ( V L = 0V ) R TOTAL VS R 1 + R 2 + . . . + R 99 @ 3kΩ = R TOTAL (Refer Test Circuit 1) PIN CONFIGURATION DIP/SOIC/(TSSOP) (CS) INC 1 (VCC) U/D 2 (INC) VH 3 (U/D) V SS X9C303 4 8 VCC (VL) 7 CS (VW) 6 VL (VSS) VW (VH) 5 2 FN8223.0 March 11, 2005 X9C303 PRINCIPLES OF OPERATION There are three sections of the X9C303: 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 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 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. The system may select the X9C303, 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-down/up 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 device and then move the wiper up and down until the proper trim is attained. MODE SELECTION CS INC 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 H SYMBOL TABLE Instructions and Programming 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. The value of the counter is stored in nonvolatile memory whenever CS transitions HIGH while the INC input is also HIGH. 3 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 FN8223.0 March 11, 2005 X9C303 Typical wiper resistance ...........................40Ω at 1mA Typical resistor noise .........................23 nV (RMS)/√Hz at 1kHzPHZ Typical charge pump noise . 20 mV (RMS) @ 2.5 MHz ABSOLUTE MAXIMUM RATINGS Temperature under bias .................... -65°C to +135°C Storage temperature ......................... -65°C to +150°C Voltage on CS, INC, U/D and VCC with respect to VSS .................................. -1V to +7V Voltage on VH and VL referenced to VSS .................................... -8V to +8V ∆V = |VH - VL| X9C303 .......................................... 10V Lead temperature (soldering, 10 seconds) ...... +300°C Wiper current......................................................±1mA Relative Variation Relative variation is a measure of the error in step size between taps = log (Vw(n)) - log (Vw(n - 1)) = 0.045 ± 0.003 for tap n = 2 - 99 Temperature Coefficient (-40°C to +85°C) X9C303 .......... ±400 ppm/°C Typical Ratiometric temperature coefficient ..............±20 ppm 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. Wiper Adjustability Unlimited Wiper Adjustment (Non-Store operation) Wiper Position Store Operations ...................100,000 Data Changes per Bit Physical Characteristics Marking Includes ANALOG CHARACTERISTICS Manufacturer’s Trademark Electrical Characteristics Resistance Value or Code End-to-end resistance tolerance ........................ ±15% Power rating at 25°C X9C303 ........................... 10mW Wiper current ............................................ ±1mA Max. Date Code Typical Electrical Taper 100.0% 90.0% 80.0% % Total Resistance 70.0% 60.0% 50.0% 40.0% 30.0% 20.0% 10.0% 99 96 93 90 87 84 81 78 75 72 69 66 63 60 57 54 51 45 48 42 39 36 33 30 27 24 21 18 15 9 6 12 R(VH - VW) R(VW - VL) 3 0 0.0% Tap 4 FN8223.0 March 11, 2005 X9C303 Test Circuit #1 Test Circuit #2 Circuit #3 SPICE Macro Model VH VH RTOTAL RH Test Point VS Test Point VW VW VL VL Force Current CH CW 10pF 25pF CL RL 10pF RW RECOMMENDED OPERATING CONDITIONS Temperature Min. Max. Supply Voltage Limits Commercial 0°C +70°C X9C303 5V ±10% Industrial –40°C +85°C Military –55°C +125°C D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.) Limits Symbol Parameter Min. Typ. (1) Max. Unit Test Conditions 1 3 mA CS = VIL, U/D = VIL or VIH and INC = 0.4V to 2.4V @ max. tCYC 200 750 µA CS = VCC - 0.3V, U/D and INC = VSS or VCC - 0.3V ±10 µA 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 RW Wiper resistance 100 Ω VH VH terminal voltage -5 +5 V VL VL terminal voltage -5 +5 V 10 pF VCC = 5V, VIN = VSS, TA = 25°C, f = 1MHz pF See Circuit 3 CIN (2) 40 CS, INC, U/D input capacitance CH/CL/CW Potentiometer capacitance 10/10/25 Max. Wiper Current ±1mA Standard Parts Part Number Maximum Resistance Wiper Increments Minimum Resistance X9C303 32kΩ Log Taper 40Ω Typical Notes: (1) Typical values are for TA = 25°C and nominal supply voltage. (2) 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 5 FN8223.0 March 11, 2005 X9C303 A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified) Limits Symbol tCl tlD tDI tlL tlH tlC tCPH tIW Parameter 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 tCYC Min. 100 100 2.9 1 1 1 20 INC cycle time tR, tF (4) tPU (4) tR VCC (4) Typ. (3) Max. Unit ns ns µs µs µs µs ms 100 500 µs 4 µs INC input rise and fall time 500 ns Power-up to wiper stable 500 µs 50 mV/µs VCC power-up rate 0.2 A.C. TIMING CS tCYC tCI tIL tIC tIH tCPH 90% 90% 10% INC tID tDI tF tR U/D tIW MI VW (8) Notes: (3) Typical values are for TA = 25°C and nominal supply voltage. (4) This parameter is periodically sampled and not 100% tested. (5) 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. 6 FN8223.0 March 11, 2005 X9C303 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. Typ. 0.010 (0.25) 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° NOTE: 1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH 7 FN8223.0 March 11, 2005 X9C303 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) 8 FN8223.0 March 11, 2005 X9C303 PACKAGING INFORMATION 8-Lead Plastic, TSSOP, Package Type V .025 (.65) BSC .169 (4.3) .252 (6.4) BSC .177 (4.5) .114 (2.9) .122 (3.1) .047 (1.20) .0075 (.19) .0118 (.30) .002 (.05) .006 (.15) .010 (.25) Gage Plane 0° - 8° Seating Plane .019 (.50) .029 (.75) (4.16) (7.72) Detail A (20X) (1.78) .031 (.80) .041 (1.05) (0.42) (0.65) All Measurements Are Typical See Detail “A” NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 9 FN8223.0 March 11, 2005 X9C303 Ordering Information X9C303 X X Temperature Range Blank = Commercial = 0°C to +70°C I = Industrial = -40°C to +85°C Package P = 8-Lead Plastic DIP S8 = 8-Lead SOIC V8 = 8-Lead TSSOP 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 10 FN8223.0 March 11, 2005