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| CAT5128 32-Tap Digital Up/Down Control Potentiometer FEATURES 32-position linear taper potentiometer Low power CMOS technology Single supply operation: 2.5V - 5.5V Discrete step-up/step-down digital control Resistance values: 10k, 50k and 100k Available in SOT-23 8-lead Pb-free package DESCRIPTION The CAT5128 is a single digitally programmable potentiometer (DPPTM) designed as an 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 CAT5128 contains a 32-tap series resistor array connected between two terminals A and B. An up/down counter and decoder that are controlled by two input pins, determines which tap is connected to the wiper, W. Wiper-control of the CAT5128 is accomplished with two input control pins, UP and . A high-to-low transition on the UP input DOWN increments the wiper position and a high-to-low transition on the input decrements the wiper DOWN position. The tap position is not stored in memory. The wiper is always set to the mid point, tap 15 at power up. 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. APPLICATIONS 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 For Ordering Information details, see page 7. FUNCTIONAL DIAGRAM 5-BIT UP/DOWN COUNTER 31 30 A A VCC A UP UP/DOWN Control DOWN Power On Recall GND B DOWN W VCC 29 ONE 28 OF THIRTY TWO DECODER CONTROL CIRCUITRY 2 1 UP TRANSFER GATES RESISTOR ARRAY W GND 0 B W B Electronic Potentiometer Implementation General Detailed (c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. MD-2128 Rev. A CAT5128 PIN CONFIGURATION SOT-23 8-Lead UP DOWN A GND 1 2 3 4 8 VCC NC B W 7 6 5 PIN DESCRIPTIONS Name Function Step-Up Control UP Step-Down Control DOWN A GND W B NC VCC Potentiometer High Terminal Ground Wiper Terminal Potentiometer Low Terminal Not Connected Supply Voltage CAT PIN DESCRIPTION UP: Step-Up Control Input When input is high, a high-to-low transition on DOWN UP input will cause the wiper to move one increment toward the A terminal. : Step-Down Control Input DOWN A high-to-low transition on input will cause the DOWN wiper to move one increment towards the B terminal. A: High End Potentiometer Terminal A is the high end terminal of the potentiometer. It is not required that this terminal be connected to a potential greater than the B terminal. Voltage applied to the A terminal cannot exceed the supply voltage, VCC or go below ground, GND. W: Wiper Potentiometer Terminal W is the wiper terminal of the potentiometer. Its position on the resistor array is controlled by the control inputs, UP and . Voltage applied to the DOWN W terminal cannot exceed the supply voltage, VCC or go below ground, GND. B: Low End Potentiometer Terminal B is the low end terminal of the potentiometer. It is not required that this terminal be connected to a potential less than the A terminal. Voltage applied to the B terminal cannot exceed the supply voltage, VCC or go below ground, GND. B and A are electrically interchangeable. DEVICE OPERATION The CAT5128 operates like a digitally controlled potentiometer with A and B equivalent to the high and low terminals and W equivalent to the mechanical potentiometer's wiper. There are 32 available tap positions including the resistor end points, A and B. There are 31 resistor elements connected in series between the A and B terminals. The wiper terminal is connected to one of the 32 taps and controlled by two inputs, UP and . These inputs control a five-bit DOWN up/down counter whose output is decoded to select the wiper position. A high-to-low transition on input will DOWN decrement one step the wiper position (RWB will decrease with 1LSB and RWA will increase with 1LSB). If and only if input is high, a high-to-low DOWN transition on UP input will increment one step the wiper position (RWB will increase with 1LSB and RWA will decrease with 1LSB). The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. When the CAT5128 is powered-down, the wiper position is reset. When power is restored, the counter is set to the mid point, tap 15. Doc. No. MD-2128 Rev. A 2 (c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5128 OPERATION MODES UP High to Low X High High to Low Low High DOWN High Low High to Low High to Low X High Operation Wiper toward A - RW Increment Wiper does not change Wiper toward B - RW Decrement Wiper toward B - RW Decrement Wiper does not change Wiper does not change CB B RB CA A RA RW W CW Potentiometer Equivalent Circuit ABSOLUTE MAXIMUM RATINGS (1) Parameters Supply Voltage VCC to GND Inputs UP to GND to GND DOWN A, B, W to GND Operating Ambient Temperature Industrial (`I' suffix) Junction Temperature Storage Temperature Lead Soldering (10 seconds max) Thermal Resistance JA DC ELECTRICAL CHARACTERISTICS (1) VCC = +2.5V to +5.5V unless otherwise specified Power Supply Symbol VCC ICC1 ISB1(3) Parameter Operating Voltage Range Supply Current (Increment) Supply Current (Standby) VCC = 5.5V, f = 1MHz, IW = 0 VCC = 5.5V, f = 250kHz, IW = 0 DOWN UP, = VCC or GND Conditions Min 2.5 - - - Typ - - - 0.01 Max 5.5 100 50 1 Units V A A A -40 to +85 +150 -65 to 150 +300 230 C C C C C/W -0.5 to VCC +0.5 -0.5 to VCC +0.5 -0.5 to VCC +0.5 V V V -0.5 to +7V V Ratings Units Notes: (1) Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability. (c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice 3 Doc. No. MD-2128 Rev. A CAT5128 LOGIC INPUTS VCC = +2.5V to +5.5V unless otherwise specified Symbol IIH IIL VIH1 VIL1 VIH2 VIL2 Parameter Input Leakage Current Input Leakage Current TTL High Level Input Voltage TTL Low Level Input Voltage CMOS High Level Input Voltage CMOS Low Level Input Voltage Conditions VIN = VCC VIN = 0V 4.5V VCC 5.5V 2.5V VCC 5.5V Min - - 2 0 VCC x 0.7 -0.3 Typ - - - - - - Max 10 -10 VCC 0.8 VCC + 0.3 VCC x 0.2 Units A A V V V V POTENTIOMETER CHARACTERISTICS VCC = +2.5V to +5.5V unless otherwise specified Symbol RPOT Parameter Potentiometer Resistance Pot. Resistance Tolerance VA VB INL DNL RWI IW TCRPOT TCRATIO VN (3) Conditions -10 Device -50 Device -00 Device Min Typ 10 50 (1) Max Units k 100 20 0 0 3.2 VCC VCC 0.1 0.05 70 150 50 5 8/24 8/8/25 1.7 20 300 1 0.5 0.5 % V V % LSB LSB mA ppm/C ppm/C nV/Hz pF MHz Voltage on A pin Voltage on B pin Resolution Integral Linearity Error Differential Linearity Error Wiper Resistance Wiper Current TC of Pot Resistance Ratiometric TC Noise Potentiometer Capacitances Frequency Response IW 2A IW 2A VCC = 5V, IW = 1mA VCC = 2.5V, IW = 1mA (2) (3) (3) 100kHz / 1kHz (3) Passive Attenuator, 10k -0.5 -0.5 CA/CB/CW B fc (3) Notes: (1) Typical values are for TA = 25C and nominal supply voltage. (2) IW = source or sink. (3) These parameters are periodically sampled and are not production tested. Doc. No. MD-2128 Rev. A 4 (c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5128 AC CONDITIONS OF TEST VCC Range Input Pulse Levels Input Rise and Fall Times Input Reference Levels 2.5V VCC 5.5V 0.2VCC to 0.7VCC 10ns 0.5VCC AC OPERATING CHARACTERISTICS VCC = +2.5V to +5.5V, VH = VCC, VL = 0V, unless othewise specified Symbol tUP tDOWN tUP_CYC tDOWN_CYC tUP_R, tUP_F tUP_SET tDOWN_SET tPU (2) (2) (2) Parameter UP LOW Period LOW Period DOWN UP Cycle Time Cycle Time DOWN UP Rise and Fall Time Rise and Fall Time DOWN UP Settling Time Settling Time DOWN Power-up to Wiper Stable Min 500 500 1 1 - - 200 200 - Typ - - - - - - - - - (1) Max - - - - 500 500 - - 1 Units ns ns s s ns ns ns ns ms tDOWN_R, tDOWN_F INTERFACE TIMING DIAGRAM tUP_CYC tUP UP tUP_R 90% 10% 90% 10% tUP_F MI(3) tUP_SET RW Increment RW in Discrete Steps tDOWN_CYC tDOWN DOWN tDOWN_R 90% 10% 90% 10% tDOWN_F tDOWN_SET RW MI(3) Decrement RW in Discrete Steps Notes: (1) Typical values are for TA = 25C and nominal supply voltage. (2) This parameter is periodically sampled and not 100% tested. (3) 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. (c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice 5 Doc. No. MD-2128 Rev. A CAT5128 PACKAGE OUTLINE DRAWING SOT-23 8-Lead (TB) (1)(2) SYMBOL MIN NOM MAX A A1 A2 E1 E 0.90 0.00 0.90 0.60 0.28 0.08 2.90 BSC 2.80 BSC 1.60 BSC 0.65 BSC 0.30 0.45 0.60 REF 0.25 REF 0 1.10 1.45 0.15 1.30 0.80 0.38 0.22 A3 b c D E E1 e L L1 L2 e PIN #1 IDENTIFICATION TOP VIEW b 0.60 8 D A A3 A2 c A1 SIDE VIEW L1 L L2 END VIEW For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC standard MO-178. Doc. No. MD-2128 Rev. A 6 (c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5128 EXAMPLE OF ORDERING INFORMATION Prefix CAT Device # 5128 Suffix TB (1) I -10 - G T3 Optional Company ID Product Number 5128 Temperature Range I = Industrial (-40C to 85C) Resistance -10: 10k -50: 50k -00: 100k Tape & Reel T: Tape & Reel 3: 3,000/Reel Lead Finish G:NiPdAu Package TB: SOT-23 ORDERING PART NUMBER Resistance CAT5128TBI-10 CAT5128TBI-50 CAT5128TBI-00 (5) Package SOT-23-8 10k 50k 100k For Product Top Mark Codes, click here: http://www.catsemi.com/techsupport/producttopmark.asp Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard lead finish is NiPdAu. (3) This device used in the above example is a CAT5128TBI-10-GT3 (SOT-23, Industrial Temperature, 10k, NiPdAu, Tape & Reel, 3,000/Reel) . (4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. (5) Contact factory for availability. (c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice 7 Doc. No. MD-2128 Rev. A REVISION HISTORY Date 03/19/08 Rev. A Reason Initial Release Copyrights, Trademarks and Patents (c) Catalyst Semiconductor, Inc. Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Adaptive AnalogTM, Beyond MemoryTM, DPPTM, EZDimTM, LDDTM, MiniPotTM, Quad-ModeTM and Quantum Charge ProgrammableTM Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. 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, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL 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 2975 Stender Way Santa Clara, CA 95054 Phone: 408.542.1000 Fax: 408.542.1200 www.catsemi.com Document No: MD-2128 Revision: A Issue date: 03/19/08 |
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