CAT5128 32-Tap Digital Up/Down Control Potentiometer FEATURES DESCRIPTION 32-position linear taper potentiometer The CAT5128 is a single digitally programmable potentiometer (DPP™) 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. Low power CMOS technology Single supply operation: 2.5V – 5.5V Discrete step-up/step-down digital control Resistance values: 10kΩ, 50kΩ and 100kΩ Available in SOT-23 8-lead Pb-free package APPLICATIONS 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 ¯¯ and accomplished with two input control pins, UP ¯¯¯¯¯¯ ¯¯ input DOWN . A high-to-low transition on the UP increments the wiper position and a high-to-low transition on the ¯¯¯¯¯¯ DOWN input decrements the wiper position. The tap position is not stored in memory. The wiper is always set to the mid point, tap 15 at power up. 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 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 Ordering Information details, see page 7. FUNCTIONAL DIAGRAM VCC 29 VCC UP/DOWN Control W ONE 28 OF THIRTY TWO DECODER UP CONTROL CIRCUITRY DOWN Power On Recall GND B TRANSFER GATES RESISTOR ARRAY W 2 DOWN 1 GND 0 General © Catalyst Semiconductor, Inc. Characteristics subject to change without notice A 30 A UP A 31 5-BIT UP/DOWN COUNTER Detailed 1 B W B Electronic Potentiometer Implementation Doc. No. MD-2128 Rev. A CAT5128 PIN DESCRIPTIONS PIN CONFIGURATION SOT-23 8-Lead ¯¯ UP 1 ¯¯¯¯¯¯ DOWN 2 A 3 GND 4 CAT Name Function ¯¯ Step-Up Control UP ¯¯¯¯¯¯ DOWN Step-Down Control 8 VCC 7 NC 6 B A 5 W GND Potentiometer High Terminal Ground W Wiper Terminal B Potentiometer Low Terminal NC Not Connected VCC Supply Voltage PIN DESCRIPTION DEVICE OPERATION ¯¯ : Step-Up Control Input UP When ¯¯¯¯¯¯ DOWN input is high, a high-to-low transition on ¯¯ input will cause the wiper to move one increment UP toward the A terminal. 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 ¯¯ and ¯¯¯¯¯¯ inputs, UP DOWN . These inputs control a five-bit up/down counter whose output is decoded to select the wiper position. ¯¯¯¯¯¯ DOWN : Step-Down Control Input A high-to-low transition on ¯¯¯¯¯¯ DOWN input will cause the 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. A high-to-low transition on ¯¯¯¯¯¯ DOWN input will decrement one step the wiper position (RWB will decrease with 1LSB and RWA will increase with 1LSB). If and only if ¯¯¯¯¯¯ DOWN input is high, a high-to-low ¯¯ input will increment one step the transition on UP wiper position (RWB will increase with 1LSB and RWA will decrease with 1LSB). W: Wiper Potentiometer Terminal W is the wiper terminal of the potentiometer. Its position on the resistor array is controlled by the ¯¯ and ¯¯¯¯¯¯ control inputs, UP DOWN . Voltage applied to the W terminal cannot exceed the supply voltage, VCC or go below ground, GND. 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. 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. Doc. No. MD-2128 Rev. A 2 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5128 OPERATION MODES A ¯¯ UP High to Low ¯¯¯¯¯¯ DOWN Operation High Wiper toward A – RW Increment X Low Wiper does not change High High to Low Wiper toward B – RW Decrement High to Low High to Low Wiper toward B – RW Decrement Low X Wiper does not change High High Wiper does not change CA RA RW W CW RB CB B Potentiometer Equivalent Circuit ABSOLUTE MAXIMUM RATINGS (1) Parameters Ratings Units -0.5 to +7V V ¯¯ to GND UP ¯¯¯¯¯¯ DOWN to GND -0.5 to VCC +0.5 V -0.5 to VCC +0.5 V A, B, W to GND -0.5 to VCC +0.5 V -40 to +85 ºC Junction Temperature +150 ºC Storage Temperature -65 to 150 ºC Lead Soldering (10 seconds max) +300 ºC Thermal Resistance θJA 230 ºC/W Supply Voltage VCC to GND Inputs Operating Ambient Temperature Industrial (‘I’ suffix) DC ELECTRICAL CHARACTERISTICS (1) VCC = +2.5V to +5.5V unless otherwise specified Power Supply Symbol VCC ICC1 ISB1(3) Parameter Conditions Min Operating Voltage Range Supply Current (Increment) Supply Current (Standby) Typ Max Units 2.5 – 5.5 V VCC = 5.5V, f = 1MHz, IW = 0 – – 100 µA VCC = 5.5V, f = 250kHz, IW = 0 – – 50 µA ¯¯ , ¯¯¯¯¯¯ UP DOWN = VCC or GND – 0.01 1 µA 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. © 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 Parameter Conditions IIH Input Leakage Current IIL Input Leakage Current VIH1 TTL High Level Input Voltage VIL1 TTL Low Level Input Voltage VIH2 CMOS High Level Input Voltage VIL2 CMOS Low Level Input Voltage Min Typ Max Units VIN = VCC – – 10 µA VIN = 0V – – -10 µA 2 – VCC V 0 – 0.8 V VCC x 0.7 – VCC + 0.3 V -0.3 – VCC x 0.2 V 4.5V ≤ VCC ≤ 5.5V 2.5V ≤ VCC ≤ 5.5V POTENTIOMETER CHARACTERISTICS VCC = +2.5V to +5.5V unless otherwise specified Symbol RPOT Parameter Potentiometer Resistance Conditions Min (1) -10 Device Typ 10 -50 Device 50 -00 Device 100 Pot. Resistance Tolerance Max Units kΩ ±20 % VA Voltage on A pin 0 VCC V VB Voltage on B pin 0 VCC V INL Integral Linearity Error IW ≤ 2µA -0.5 0.1 0.5 LSB DNL Differential Linearity Error IW ≤ 2µA -0.5 0.05 0.5 LSB RWI Wiper Resistance Resolution IW 3.2 VCC = 5V, IW = 1mA 70 VCC = 2.5V, IW = 1mA 150 Wiper Current (2) TCRPOT TC of Pot Resistance (3) 50 TCRATIO Ratiometric TC (3) 5 Noise 100kHz / 1kHz Potentiometer Capacitances (3) Frequency Response Passive Attenuator, 10kΩ VN (3) CA/CB/CW B fc (3) % Ω 300 Ω 1 mA ppm/ºC 20 ppm/ºC 8/24 nV/√Hz 8/8/25 pF 1.7 MHz Notes: (1) Typical values are for TA = 25ºC 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 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5128 AC CONDITIONS OF TEST VCC Range 2.5V ≤ VCC ≤ 5.5V Input Pulse Levels 0.2VCC to 0.7VCC Input Rise and Fall Times 10ns Input Reference Levels 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 (2) tDOWN_R, tDOWN_F (2) tDOWN_SET tPU Min ¯¯ LOW Period UP ¯¯¯¯¯¯ DOWN LOW Period 500 – – ns 500 – – ns ¯¯ Cycle Time UP ¯¯¯¯¯¯ DOWN Cycle Time 1 – – µs 1 – – µs – – 500 ns – – 500 ns 200 – – ns 200 – – ns – – 1 ms ¯¯ Rise and Fall Time UP ¯¯¯¯¯¯ DOWN Rise and Fall Time ¯¯ Settling Time UP ¯¯¯¯¯¯ DOWN Settling Time tUP_SET (2) (1) Parameter Power-up to Wiper Stable Typ Max Units INTERFACE TIMING DIAGRAM tUP_CYC tUP_R tUP tUP_F 90% UP 10% 90% 10% MI(3) tUP_SET RW Increment RW in Discrete Steps tDOWN_CYC tDOWN tDOWN_R DOWN tDOWN_F 90% 10% 90% 10% tDOWN_SET MI(3) RW Decrement RW in Discrete Steps Notes: (1) Typical values are for TA = 25ºC 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. © 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) E1 e E b SYMBOL MIN A 0.90 1.45 A1 0.00 0.15 0.90 A3 0.60 0.80 b 0.28 0.38 c 0.08 0.22 1.10 D 2.90 BSC E 2.80 BSC E1 1.60 BSC L TOP VIEW MAX A2 e PIN #1 IDENTIFICATION NOM 0.65 BSC 0.30 L1 0.45 0.60 0.60 REF L2 θ 1.30 0.25 REF 0º 8º D A A3 A2 c θ L1 A1 SIDE VIEW 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 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5128 EXAMPLE OF ORDERING INFORMATION Prefix Device # CAT (1) Suffix 5128 TB Optional Company ID I -10 – Temperature Range I = Industrial (-40ºC to 85ºC) Product Number 5128 Resistance -10: 10kΩ -50: 50kΩ -00: 100kΩ Package TB: SOT-23 G T3 Tape & Reel T: Tape & Reel 3: 3,000/Reel Lead Finish G:NiPdAu ORDERING PART NUMBER Resistance CAT5128TBI-10 10kΩ CAT5128TBI-50 50kΩ CAT5128TBI-00 (5) Package SOT-23-8 100kΩ 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, 10kΩ, 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. © 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 © Catalyst Semiconductor, Inc. Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Adaptive Analog™, Beyond Memory™, DPP™, EZDim™, LDD™, MiniPot™, Quad-Mode™ and Quantum Charge Programmable™ 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