X9C303 XICOR | Alldatasheet

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Technical content

REV 1.1 4/27/01 Characteristics subject to change without notice. 1 of 10 www.xicor.com XDCP is a trademark of Xicor, Inc.

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, 32 k Ω
  • Packages —8-lead TSSOP —8-lead SOIC —8-pin DIP

DESCRIPTION

The Xicor X9C303 is a digitally controlled potentiome- ter (XDCP). The device consists 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 variable resistor in a wide variety of applications ranging from control, to signal processing, to parameter adjustment. Digitally- controlled potentiometers provide three powerful appli- cation advantages; (1) the variability and reliability of a solid-state potentiometer, (2) the flexibility of com- puter-based digital controls, and (3) the use of nonvol- atile memory for potentiometer settings retention. X9C303 Digitally Controlled Potentiometer (XDCP A PPLICATION N OTE A V A I L A B L E AN42 • AN44–48 • AN50 • AN52 • AN53 • AN71 • AN92 Terminal Voltage ±5V, 100 Taps, Log Taper 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

Characteristics subject to change without notice. 2 of 10REV 1.1 4/27/01 www.xicor.com PIN DESCRIPTIONS V H and V L The high (V H ) and low (V L ) 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 V H 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 V W is the wiper terminal, equivalent to the movable ter- minal 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 Ω Up/Down (U/D The U/D input controls the direction of the wiper move- ment and whether the counter is incriminated or decre- mented. 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. 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 V H High Terminal (Potentiometer) V W Wiper Terminal (Potentiometer) V L Low Terminal (Potentiometer) V SS Ground V CC 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 3 K Ω@R TOTAL= (Refer Test Circuit 1)

Characteristics subject to change without notice. 3 of 10REV 1.1 4/27/01 www.xicor.com 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/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 elec- tronic 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 V W change). The R TOTAL value for the device can tem- porarily 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. 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 the 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

Characteristics subject to change without notice. 4 of 10REV 1.1 4/27/01 www.xicor.com ABSOLUTE MAXIMUM RATINGS Voltage on CS , INC, U/D and V CC with respect to V SS Voltage on V H and V L referenced to V SS V = |V H L 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 reli- ability. ANALOG CHARACTERISTICS

Electrical Characteristics

Ω at 1mA Typical resistor 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 (V w(n) ) – log (V w(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)

Characteristics subject to change without notice. 5 of 10REV 1.1 4/27/01 www.xicor.com Test Circuit #1 Test Point VW VH VL VS 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. Symbol Parameter Limits Unit Test ConditionsMin. Typ. Max. I CC V CC active current 1 3 mA CS = V IL , U/D = V IL or V IH and INC = 0.4V to 2.4V @ max. t CYC I SB Standby supply current 200 750 µA CS = V CC – 0.3V, U/D and INC = V SS or V CC – 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 Part Number Maximum Resistance Wiper Increments Minimum Resistance X9C303 32K Ω Log Taper 40 Ω Typical 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% Test Circuit #2 Force VL VW VH Test Point Current Circuit #3SPICE Macro Model CW RTOTAL RH RL CH RW 10pF CL 10pF 25pF

Characteristics subject to change without notice. 6 of 10REV 1.1 4/27/01 www.xicor.com A.C. CONDITIONS OF TEST A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified) A.C. TIMING 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 V W output due to a change in the wiper position. Input pulse levels 0V to 3V Input rise and fall times 10ns Input reference levels 1.5V 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, tF4 INC input rise and fall time 500 ns tPU4 Power up to wiper stable 500 µs tR VCC4 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%

Characteristics subject to change without notice. 7 of 10REV 1.1 4/27/01 www.xicor.com PACKAGING INFORMATION NOTE: 1. ALL DIMENSIONS IN INCHES (IN 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

Characteristics subject to change without notice. 8 of 10REV 1.1 4/27/01 www.xicor.com 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

8 PlacesFOOTPRINT

Characteristics subject to change without notice. 9 of 10REV 1.1 4/27/01 www.xicor.com 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

Characteristics subject to change without notice. 10 of 10REV 1.1 4/27/01 www.xicor.com ©Xicor, Inc. 2001 Patents PendingLIMITED WARRANTY Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale onl y. Xicor, Inc. makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the descr ibed 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. COPYRIGHTS AND TRADEMARKS Xicor, Inc., the Xicor logo, E2POT, XDCP, XBGA, AUTOSTORE, Direct Write cell, Concurrent Read-Write, PASS, MPS, PushPOT, Block Lock, IdentiPROM, E2KEY, X24C16, SecureFlash, and SerialFlash are all trademarks or registered trademarks of Xicor, Inc. All other brand and product names mentioned herein are used for identification purposes only, and are trademarks or registered trademarks of their respective holders. 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; 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.

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