F R E E L E A D FEATURES APPLICATIONS DESCRIPTION. Preliminary Information CAT Tap Digitally Programmable Potentiometer (DPP )

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1 Preliminary Information CAT -Tap Digitally Programmable Potentiometer (DPP ) FEATURES APPLICATIONS HALOGEN FREE L E A D F R E E TM -position, linear-taper potentiometer Low power CMOS technology Single supply operation:.v-.v Increment up/down serial interface Resistance values: 0kΩ, 0kΩ and 00kΩ Available in PDIP, SOIC, TSSOP and MSOP packages Automated product calibration Remote control adjustments Offset, gain and zero control Tamper-proof calibrations Contrast, brightness and volume controls Motor controls and feedback systems Programmable analog functions DESCRIPTION The CAT is a single digitally programmable potentiometer (DPP ) designed as a electronic replacement for mechanical potentiometers and trim pots. Ideal for automated adjustments on high volume production lines, they are also well suited for applications where equipment requiring periodic adjustment is either difficult to access or located in a hazardous or remote environment. The CAT contains a -tap series resistor array connected between two terminals R H and R L. An up/ down counter and decoder that are controlled by three input pins, determines which tap is connected to the wiper, R W. The wiper is always set to the mid point, tap at power up. The tap position is not stored in memory. Wiper-control of the CAT is accomplished with three input control pins,,, and. The input increments the wiper in the direction which is determined by the logic state of the input. The input is used to select the device. The digitally programmable potentiometer can be used as a three-terminal resistive divider or as a two-terminal variable resistor. DPPs bring variability and programmability to a wide variety of applications including control, parameter adjustments, and signal processing. For a pin-compatible device that recalls a stored tap position on power-up refer to the CAT data sheet. FUNCTIONAL DIAGRAM UP/DOWN () REMENT () DEVICE SELECT () Vcc (Supply Voltage) Control and Memory POR GENERAL R H / V H / VW R L / VL Vcc VSS -BIT UP/DOWN COUNTER CONTROL CIRCUITRY 0 9 ONE OF THIRTY TWO DECODER 0 TRANSFER GATES RESISTOR ARRAY GENERAL DETAILED ELECTRONIC POTENTIOMETER IMPLEMENTATION R H / V H R L / VL / VW V H / R H VW / VL / R L 00 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Doc. No., Rev. F

2 CAT PIN CONFIGURATION RH RH DIP Package (P, L) TSSOP Package (U, Y) RL SOIC Package (S, V) RL PIN DESCRIPTIONS : Increment Control Input The input moves the wiper in the up or down direction determined by the condition of the input. : Up/Down Control Input RH The input controls the direction of the wiper movement. When in a high state and is low, any highto-low transition on will cause the wiper to move one increment toward the R H terminal. When in a low state and is low, any high-to-low transition on will cause the wiper to move one increment towards the R L terminal. R H: High End Potentiometer Terminal R H is the high end terminal of the potentiometer. It is not required that this terminal be connected to a potential greater than the R L terminal. Voltage applied to the R H terminal cannot exceed the supply voltage, or go below ground,. R W : Wiper Potentiometer Terminal R W is the wiper terminal of the potentiometer. Its position on the resistor array is controlled by the control inputs,, and. Voltage applied to the R W terminal cannot exceed the supply voltage, or go below ground,. R L : Low End Potentiometer Terminal R W R H MSOP Package (R, Z) R L is the low end terminal of the potentiometer. It is not required that this terminal be connected to a potential less than the R H terminal. Voltage applied to the R L terminal cannot exceed the supply voltage, or go below ground,. R L and R H are electrically interchangeable. R L RL PIN FUNCTIONS Pin Name RH RL : Chip Select The chip select input is used to activate the control input of the CAT and is active low. When in a high state, activity on the and inputs will not affect or change the position of the wiper. DEVICE OPERATION Function Increment Control Up/Down Control Potentiometer High Terminal Ground Potentiometer Wiper Terminal Potentiometer Low Terminal Chip Select Supply Voltage The CAT operates like a digitally controlled potentiometer with R H and R L equivalent to the high and low terminals and R W equivalent to the mechanical potentiometer's wiper. There are available tap positions including the resistor end points, R H and R L. There are resistor elements connected in series between the R H and R L terminals. The wiper terminal is connected to one of the taps and controlled by three inputs,, and. These inputs control a five-bit up/down counter whose output is decoded to select the wiper position. With set LOW the CAT is selected and will respond to the and inputs. HIGH to LOW transitions on wil increment or decrement the wiper (depending on the state of the input and fivebit counter). The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. When the CAT is powereddown, the wiper position is reset. When power is restored, the counter is set to the mid point, tap. Doc. No., Rev. F

3 CAT OPERATION MODES R H Operation High to Low Low High Wiper toward H High to Low Low Low Wiper toward L X High X Standby C H R wi C W R W C L R L Potentiometer Equivalent Circuit ABSOLUTE MAXIMUM RATINGS Supply Voltage to... 0.V to V Inputs to...0.v to 0.V to...0.v to 0.V to...0.v to 0.V H to...0.v to 0.V L to...0.v to 0.V W to...0.v to 0.V RELIABILITY CHARACTERISTI Symbol Parameter Test Method Min Typ Max Units V ZAP () ESD Susceptibility MIL-STD-, Test Method Volts I LTH ()() Latch-Up JEDEC Standard 00 ma T DR Data Retention MIL-STD-, Test Method Years N END Endurance MIL-STD-, Test Method 00,000,000 Stores DC Electrical Characteristics: =.V to.v unless otherwise specified Power Supply Symbol Parameter Conditions Min Typ Max Units Operating Voltage Range.. V I CC Supply Current (Increment) =.V, f = MHz, I W =0 00 µa =.V, f = 0kHz, I W =0 0 ISB () Supply Current (Standby) = -0.V µa Logic Inputs, = -0.V or Operating Ambient Temperature Industrial ( I suffix)... 0 C to C Junction Temperature... 0 C Storage Temperature... C to 0 C Lead Soldering (0 sec max) C * Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. Absolute Maximum Ratings are limited values applied individually while other parameters are within specified operating conditions, and functional operation at any of these conditions is NOT implied. Device performance and reliability may be impaired by exposure to absolute rating conditions for extended periods of time. Symbol Parameter Conditions Min Typ Max Units I IH Input Leakage Current V IN = 0 µa I IL Input Leakage Current V IN = 0V 0 µa V IH TTL High Level Input Voltage.V.V V V IL TTL Low Level Input Voltage 0 0. V V IH CMOS High Level Input Voltage.V.V x V V IL CMOS Low Level Input Voltage -0. x 0. V NOTES: () This parameter is tested initially and after a design or process change that affects the parameter. () Latch-up protection is provided for stresses up to 00mA on address and data pins from V to V () I W =source or sink () These parameters are periodically sampled and are not 00% tested. Doc. No., Rev. F

4 CAT Potentiometer Parameters Symbol Parameter Conditions Min Typ Max Units R POT Potentiometer Resistance -0 Device 0-0 Device 0 kω -00 Device 00 Pot Resistance Tolerance ± 0 % V RH Voltage on R H pin 0 V V RL Voltage on R L pin 0 V Resolution. % INL Integral Linearity Error I W µa 0. LSB DNL Differential Linearity Error I W µa LSB R Wi Wiper Resistance = V, I W = ma 00 Ω =.V, I W = ma kω I W Wiper Current ma TC RPOT TC of Pot Resistance 00 ppm/ o C TC RATIO Ratiometric TC 0 ppm/ o C V N Noise 00kHz / khz / nv/ H z C H /C L /C W Potentiometer Capacitances // pf fc Frequency Response Passive Attenuator, 0kΩ. MHz Doc. No., Rev. F

5 CAT AC CONDITIONS OF TEST Range.V.V Input Pulse Levels Input Rise and Fall Times Input Reference Levels 0. to 0. 0ns 0. AC OPERATING CHARACTERISTI: =.V to.v, V H =, V L = 0V, unless otherwise specified Symbol Parameter Min Typ () Max Units t CI to Setup 00 ns t DI to Setup 0 ns t ID to Hold 00 ns t IL LOW Period 0 ns t IH HIGH Period 0 ns t IC Inactive to Inactive µs t CPH Deselect Time 00 ns t IW to V OUT Change µs t CYC Cycle Time µs t R, t F () Input Rise and Fall Time 00 µs t PU () Power-up to Wiper Stable msec A. C. TIMING t CYC t CI t IL t IH t IC t CPH 90% 90% 0% tdi tid t F t R t IW MI () () Typical values are for T A =oc and nominal supply voltage. () This parameter is periodically sampled and not 00% tested. () MI in the A.C. Timing diagram refers to the minimum incremental change in the W output due to a change in the wiper position. Doc. No., Rev. F

6 CAT APPLICATIONS INFORMATION Potentiometer Configurations (a) resistive divider (b) variable resistance (c) two-port Applications DPP U/ V (-) A R R R R R A 9 0 V O U/ RA { { } } R pr POT (-p)r POT CAT// V () A R R.V RB R C.0 F,.00 F.0 F Programmable Instrumentation Amplifier Programmable Sq. Wave Oscillator () OSC ICA / HC 00mV 0k ICIB.00V = VREF 0k 0.0 F CAT/ IC VCORR Sensor 99k 99k 99k -V 99k VOUT = V mv ICIA 00mV = VSHIFT Sensor Auto Referencing Circuit V 0mV VSENSR Doc. No., Rev. F

7 APPLICATIONS INFORMATION CAT 00k U/ CAT/ V IN (UNREG) U/ SHUTDOWN F Control and Memory SD 9 V OUT FB.V R k R 0 R 0k.. F V 0 (REG) I S 0 pr (-p)r 0 M } } 0k A A LT09.V V O POR CAT// Programmable Voltage Regulator Programmable I to V convertor CAT/ R 00k V S F R 0k C.00 C.00 R 00k A V O Serial Bus V S.V R 00k R 00k R 00k R.k I S R 0k A.V CAT/.V A=A=/ LMC0A Programmable Bandpass Filter Programmable Current Source/Sink OSC IC HC CLO IC 9 VLL R R 0k 0. F CHI VUL R IC CAT/ 0k VS.V 0 < VS <.V AI IC VO.V < VO < V Automatic Gain Control Doc. No., Rev. F

8 CAT ORDERING INFORMATION Prefix Device # Suffix CAT S I -0 TE Optional Company ID Product Number Resistance -0: 0kohms -0: 0kohms -00: 00kohms Tape & Reel SOIC: 000/Reel TSSOP: 000/Reel MSOP: 00/Reel Package P: PDIP S: SOIC U: TSSOP R: MSOP L: PDIP (Lead free, Halogen free) V: SOIC (Lead free, Halogen free) Y: TSSOP (Lead free, Halogen free) Z: MSOP (Lead free, Halogen free) Notes: () The device used in the above example is a CAT SI-0TE (SOIC, 0K Ohms, Industrial Temperature, Tape & Reel) Doc. No., Rev. F

9 CAT REVISION HISTORY Date Rev. Reason 9//00 B Changed designation to Preliminary Updated Description Updated Potentiometer Parameters table /0/00 C Updated Potentiometer Parameters table /9/00 D Changed Green Package marking for SOIC from W to V //00 E Updated Reel Ordering Information //00 F Deleted ICC from DC Characteristics table Updated AC Operating Characteristics table Updated A.C. Timing diagram Copyrights, Trademarks and Patents Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: DPP AE Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. For a complete list of patents issued to Catalyst Semiconductor contact the Company s corporate office at CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING OUT OF ANY SUCH USE OR APPLICATION, LUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR IDENTAL DAMAGES. Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale. Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete. Catalyst Semiconductor, Inc. Corporate Headquarters 0 Borregas Avenue Sunnyvale, CA 909 Phone: Fax: Publication #: Revison: F Issue date: //0 Type: Preliminary 9 Doc. No., Rev. F

DIGITAL POTENTIOMETERS DP 7114

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