X9C303 INTERSIL | Alldatasheet

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FN8223.0 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 Terminal Voltage ±5V, 100 Taps, Log Taper Digitally Controlled Potentiometer (XDCP™)

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 CC = 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

DESCRIPTION

The Intersil X9C303 is a digitally controlled potentiom- eter (XDCP). The device cons ists of a resistor array, wiper switches, a control section, and nonvolatile memory. The wiper position is controlled by a three- wire interface. The resistor array is composed of 99 resistive ele- ments. Between each element and at either end are tap points accessible to the wiper terminal. The posi- tion 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 potentio- meter or as a two-terminal va riable resistor in a wide variety of applications rang ing from control, to signal processing, to paramete r adjustment. Digitally- controlled potentiometers provide three powerful appli- cation advantages; (1) the variability and reliability of a solid-state potent iometer, (2) the flexibility of com- puter-based digital controls, and (3) the use of nonvol- atile memory for potentiometer settings retention. BLOCK DIAGRAM 7-Bit Up/Down Counter 7-Bit Nonvolatile Memory Store and Recall Control Circuitry One of Hundred Decoder Resistor Array RL/VL RW/VW RH/VH U/D INC CS Transfer VCC One- Gates 0VSS Data Sheet March 11, 2005

2 FN8223.0 March 11, 2005 PIN DESCRIPTIONS 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 terminol- ogy 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. VW 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 con- trol inputs. The wiper terminal series resistance is typi- cally 40Ω. Up/Down (U/D The U/D input controls the direction of the wiper movement and whether the counter is incriminated or decremented. Increment (INC The INC input is negative-edge triggered. Toggling INC will move the wiper and either increment or decre- ment 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 po wer standby mode until the device is selected once again. PIN CONFIGURATION PIN NAMES POTENTIOMETER RELATIONSHIPS VCC CS VL VW INC U/D VH VSS X9C303 DIP/SOIC/(TSSOP) (CS) (VCC) (INC) (U/D) (VL) (VW) (VSS) (VH) Symbol 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 CS Chip Select Control Input NC No Connection VL VH (VS) R99 R98 S100 S99 S98 VW Gi 20Log R1 R2 . . . R i+++ RTOTAL VW VS R1 R2 . . . R 99+++ 3 kΩ@R TOTAL= (Refer Test Circuit 1) X9C303

3 FN8223.0 March 11, 2005 PRINCIPLES OF OPERATION There are three sections of the X9C303: the input con- trol, counter and decode section; the nonvolatile mem- ory; and the resistor array. The input control section operates just like an up/dow n 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 com- prised 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 t IW (INC to VW change). The R TOTAL 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 main tained 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. 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 mem- ory whenever CS transitions HIGH while the INC input is also HIGH. The system may select th e X9C303, move the wiper, and deselect the device without having to store the lat- est 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 posi- tion 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 SYMBOL TABLE CS INC U/D Mode L H Wiper Up L L Wiper Down H X Store Wiper Position H X X Standby Current L X No Store, Return to Standby WAVEFORM INPUTS OUTPUTS Must be steady Will be steady May change from Lo w to High Will change from Lo w 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 X9C303

4 FN8223.0 March 11, 2005 ABSOLUTE MAXIMUM RATINGS Voltage on CS , INC, U/D and VCC Voltage on VH and VL 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 ot her conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute maximum rating con- ditions for extended periods may affect device reliability. ANALOG CHARACTERISTICS

Electrical Characteristics

Typical charge pump noise . 20 mV (RMS) @ 2.5 MHz 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 Wiper Adjustability Unlimited Wiper Adjustment (Non-Store operation) Wiper Position Store Physical Characteristics Marking Includes Manufacturer’s Trademark Resistance Value or Code Date Code Typical Electrical Taper 100.0% 90.0% 80.0% 70.0% 60.0% 50.0% 40.0% 30.0% 20.0% 10.0% 0.0% % Total Resistance Tap R(VH - VW) R(VW - VL) X9C303

5 FN8223.0 March 11, 2005 D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.) Standard Parts Notes: (1) Typical values are for T A = 25°C and nominal supply voltage. (2) This parameter is periodically sampled and not 100% tested. A.C. CONDITIONS OF TEST Symbol Parameter Limits Unit Test ConditionsMin. Typ. (1) Max. ICC VCC active current 1 3 mA CS = VIL, U/D = VIL or VIH and INC = 0.4V to 2.4V @ max. tCYC ISB Standby supply current 200 750 µA CS = VCC - 0.3V, U/D and INC =V SS or VCC - 0.3V ILI CS, INC, U/D input leakage current ±10 µA V IN = VSS to VCC VIH CS, INC, U/D input HIGH voltage 2V CC + 1 V VIL CS, INC, U/D input LOW voltage -1 0.8 V RW Wiper resistance 40 100 Ω Max. Wiper Current ±1mA VH VH terminal voltage -5 +5 V VL VL terminal voltage -5 +5 V CIN (2) CS, INC, U/D input capacitance 10 pF V CC = 5V, VIN = VSS, TA = 25°C, f = 1MHz CH/CL/CW Potentiometer capacitance 10/10/25 pF See Circuit 3 Test Circuit #1 Test Point VW VH VL VS Test Circuit #2 Force VL VW VH Test Point Current Circuit #3 SPICE Macro Model CW RTOTAL RH RL CH RW 10pF CL 10pF 25pF RECOMMENDED OPERATING CONDITIONS Temperature Min. Max. Commercial 0°C +70°C Industrial –40°C +85°C Military –55°C +125°C Supply Voltage Limits X9C303 5V ±10% Part Number Maximum Resistance Wiper Increments Minimum Resistance X9C303 32k Ω Log Taper 40 Ω Typical Input pulse levels 0V to 3V Input rise and fall times 10ns Input reference levels 1.5V X9C303

6 FN8223.0 March 11, 2005 A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified) A.C. TIMING Notes: (3) Typical values are for T A = 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 V W output due to a change in the wiper position. Symbol Parameter Limits UnitMin. Typ. (3) Max. tCl CS to INC setup 100 ns tlD INC HIGH to U/D change 100 ns tDI U/D to INC setup 2.9 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 (4) INC input rise and fall time 500 ns tPU (4) Power-up to wiper stable 500 µs tR VCC (4) VCC power-up rate 0.2 50 mV/µs CS INC U/D VW tCI tIL tIH tCYC tID tDI tIW MI (8) tIC tCPH tF tR 10% 90% 90% X9C303

7 FN8223.0 March 11, 2005 PACKAGING INFORMATION NOTE: 1. ALL DIMENSIONS IN INCHES (I N PARENTHESES IN MILLIMETERS) 2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH 0.020 (0.51) 0.016 (0.41) 0.150 (3.81) 0.125 (3.18) 0.110 (2.79) 0.090 (2.29) 0.430 (10.92) 0.360 (9.14) 0.300 (7.62) Ref. Pin 1 Index 0.145 (3.68) 0.128 (3.25) 0.025 (0.64) 0.015 (0.38) Pin 1 Seating 0.065 (1.65) 0.045 (1.14) 0.260 (6.60) 0.240 (6.10) 0.060 (1.52) 0.020 (0.51) Typ. 0.010 (0.25) 15° 8-Lead Plastic Dual In-Line Package Type P Half Shoulder Width On All End Pins Optional .073 (1.84) Max. 0.325 (8.25) 0.300 (7.62) Plane X9C303

8 FN8223.0 March 11, 2005 PACKAGING INFORMATION 0.150 (3.80) 0.158 (4.00) 0.228 (5.80) 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° 0.016 (0.410) 0.037 (0.937) 0.0075 (0.19) 0.010 (0.25) 0° - 8° X 45° 8-Lead Plastic Small Outline Gull Wing Package Type S NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 0.250" 0.050" Typical 0.050" Typical 0.030" Typical

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9 FN8223.0 March 11, 2005 PACKAGING INFORMATION NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 8-Lead Plastic, TSSOP, Package Type V See Detail “A” .031 (.80) .041 (1.05) .169 (4.3) .025 (.65) BSC .114 (2.9) .122 (3.1) .002 (.05) .006 (.15) .047 (1.20) .0075 (.19) .0118 (.30) 0° - 8° .010 (.25) .019 (.50) .029 (.75) Gage Plane Seating Plane Detail A (20X) (4.16) (7.72) (1.78) (0.42) (0.65) All Measurements Are Typical X9C303

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, soft ware and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnishe d 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 FN8223.0 March 11, 2005

Ordering Information

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 X9C303 X X X9C303