CAT5120, CAT5121, CAT5122 16-Tap MiniPot™ Digitally Programmable Potentiometers with 2-Wire Interface DESCRIPTION FEATURES CAT5120/5121/5122 linear-taper digitally programmable potentiometers perform the same function as a mechanical potentiometer or a variable resistor. These devices consist of a fixed resistor and a wiper contact with 16-tap points that are digitally controlled through a 2-wire up/down serial interface. The CAT5120 is configured as a potentiometer. The CAT5121 and CAT5122 are configured as variable resistors. See Pin Configurations for part functionality. Three resistance values are available: 10kΩ, 50kΩ and 100kΩ. These are available in space-saving 5-pin and 6-pin SC-70 and SOT-23 packages. 0.3µA Ultra-low standby current Single-supply operation: 2.7V to 5.5V Glitchless switching between resistor taps Power-on reset to midscale 2-wire up/down serial interface Resistance values: 10kΩ, 50kΩ and 100kΩ Available in SC-70 and SOT-23 packages APPLICATIONS LCD screen adjustment Volume control Mechanical potentiometer replacement Gain adjustment Line impedance matching FUNCTIONAL DIAGRAM H VDD UP-DOWN COUNTER CS U/D 16-POSITION DECODER GND For Ordering Information details, see page 10. W PIN CONFIGURATION SC-70 SOT-23 SC-70 SOT-23 VDD 1 6 GND 2 H VDD 1 5 W GND 2 CAT5120 U/D 3 L PIN DESCRIPTIONS 5 H Name VDD GND CAT5122 4 CS 6 H U/D 3 4 CS GND 2 L W Wiper Terminal of Resistor H High Terminal of Resistor ¯ U/D ¯¯ CS 5 L CAT5121 U/D 3 4 CS © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Power Supply Ground ¯¯¯¯¯ Control Input. With CS ¯¯ low, a Up/Down low-to-high transition increments or decrements the wiper position. ¯¯ Chip Select Input. A high-to-low CS transition determines the mode: ¯ is high, or decrement if increment if U/D ¯ is low. U/D Low Terminal of Resistor SC-70 SOT-23 VDD 1 Description Doc. No. MD-2121 Rev. E CAT5120, CAT5121, CAT5122 ABSOLUTE MAXIMUM RATINGS (1) Parameters Ratings Units VDD to GND -0.3 to +6 V -0.3 to (VDD + 0.3) V Input and Output Latch-Up Immunity ±200 mA Maximum Continuous Current into H, L and W 100kΩ 50kΩ 10kΩ ±0.6 ±1.3 ±1.3 Continuous Power Dissipation (TA = +70ºC) 5-pin SC-70(2) 6-pin SC-70(2) 247 245 mW -40 to +85 ºC +150 ºC -65 to +150 ºC +300 ºC All Other Pins to GND Operating Temperature Range Junction Temperature Storage Temperature Range Soldering Temperature (soldering, 10s) mA ELECTRICAL CHARACTERISTICS VDD = 2.7V to 5.5V, VH = VDD, VL = 0, TA = -40ºC to +85ºC. Typical values are at VDD = 2.7V, TA = 25ºC, unless otherwise noted. Parameter Symbol Conditions Min Typ Max Units DC Performance Resolution 16 End-to-End Resistance (-00) 75 100 125 End-to-End Resistance (-50) 37.5 50 62.5 End-to-End Resistance (-10) 7.5 10 12.5 End-to-End Resistance Tempco TCR Ratiometric Resistance Tempco Taps kΩ 200 ppm/ºC 5 ppm/ºC Integral Nonlinearity INL ±0.5 LSB Differential Nonlinearity DNL ±0.5 LSB ±0.1 ±0.5 LSB 200 600 Ω Zero/Full-Scale Error Wiper Resistance RW Digital Inputs Input High Voltage VIH Input Low Voltage VIL 0.7 x VDD V 0.3 x VDD V 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. (2) Derate 3.1mW/ºC above TA = +70ºC © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 2 Doc. No. MD-2121 Rev. E CAT5120, CAT5121, CAT5122 ELECTRICAL CHARACTERISTICS (continued) Parameter Symbol Conditions Min Typ Max Units Timing Characteristics (Figures 1, 2) ¯ Mode to CS ¯¯ Setup U/D ¯¯ to U/D ¯ Step Setup CS tCU 25 ns tCI 50 ns ¯¯ to U/D ¯ Step Hold CS ¯ Step Low Period U/D tIC 25 ns tIL 25 ns ¯ Step High Period U/D ¯¯¯¯¯ Toggle Rate (1) Up/Down tIH 25 ns Output Settling Time fTOGGLE (2) tSETTLE 1 100kΩ variable resistor configuration, CL = 10pF 100kΩ potentiometer configuration, CL = 10pF MHz 1 μs 0.25 Power Supply Supply Voltage VDD Active Supply Current (3) Standby Supply Current 2.7 IDD (4) ISB VDD = +5V 0.3 5.5 V 25 µA 1 µA TYPICAL OPERATING CHARACTERISTICS TA = 25ºC, unless otherwise noted. VDD= 2.7V 50K VDD= 5.5V 0 4 8 12 16 20 24 WIPER POSITION 28 32 TEMPERATURE (ºC) VDD= 5.5V VDD= 2.7V TEMPERATURE (ºC) Notes: 1 t SETTLE (1) Up/Down Toggle Rate: fTOGGLE = (2) (3) (4) Typical settling times are dependent on end-to-end resistance. Supply current measured while changing wiper tap, fTOGGLE = 1MHz. Supply current measured while wiper position is fixed. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 3 Doc. No. MD-2121 Rev. E CAT5120, CAT5121, CAT5122 FUNCTIONAL DESCRIPTION ¯¯ and U/D ¯ inputs control the position of the The CS ¯¯ transitions wiper along the resistor array. When CS from high to low, the part will go into increment mode ¯ input is high, and into decrement mode when if U/D ¯ input is low. Once the mode is set, the device will U/D ¯¯ goes high again. A lowremain in that mode until CS ¯ pin will increment or to-high transition at the U/D decrement the wiper position depending on the current mode (Figures 1 and 2). The CAT5120/5121/5122 consist of a fixed resistor and a wiper contact with 16-tap points that are digitally controlled through a2-wire up/down serial interface. Three end-to-end resistance values are available: 10kΩ, 50kΩ and 100kΩ. The CAT5120 is designed to operate as a potentiometer. In this configuration, the low terminal of the resistor array is connected to ground (pin 2). ¯¯ input transitions to high (serial interface When the CS inactive), the value of the counter is stored and the wiper position is maintained. The CAT5122 performs as a variable resistor. In this device, the wiper terminal and high terminal of the resistor array is connected at pin 5. The CAT5121 is a similar variable resistor, except the low terminal is connected to pin 5. Note that when the wiper reaches the maximum (or minimum) tap position, the wiper will not wrap around to the minimum (or maximum) position. Digital Interface Operation Power-On Reset The MiniPots have two modes of operation when the serial interface is active: increment and decrement ¯¯ is low. mode. The serial interface is only active when CS All parts in this family feature power-on reset (POR) circuitry that sets the wiper position to midscale at power-up. By default, the chip is in the increment mode. CS t CU t IC t IL U/D t IH t CI t SETTLE t SETTLE W Note: "W" is not a digital signal. It represents wiper transitions. Figure 1. Serial Interface Timing Diagram, Increment Mode CS t IC t CU t IH U/D t IL W t CI t SETTLE t SETTLE Note: "W" is not a digital signal. It represents wiper transitions. Figure 2. Serial Interface Timing Diagram, Decrement Mode Doc. No. MD-2121 Rev. E 4 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5120, CAT5121, CAT5122 APPLICATIONS INFORMATION The MiniPots are intended for circuits requiring digitally controlled adjustable resistance, such as LCD contrast control, where voltage biasing adjusts the display contrast. Adjustable Gain Figure 5 shows how to use the variable resistor to digitally adjust the gain of a noninverting op amp configuration. Connect the CAT5121 in series with a resistor to ground to form the adjustable gain control of a noninverting amplifier. The Minipots have a low 5ppm/°C ratiometric tempco that allows for a very stable adjustable gain configuration over temperature. Alternative Positive LCD Bias Control Use an op amp to provide buffering and gain on the output of the CAT5120. Connect the mechanical potentiometer to the positive input of a noninverting op amp (Figure 3) to select a portion of the input signal by digitally controlling the wiper terminal. Figure 4 shows a similar circuit for the CAT5121. +5V +5V H H 30V 30V W VOUT VOUT CAT5121 L CAT5120 L Figure 3. Positive LCD Bias Control Figure 4. Positive LCD Bias Control V CC VCC VIN VIN VOUT VOUT H W H L CAT5120 CAT5121 L Figure 5a. Adjustable Gain Circuit © Catalyst Semiconductor, Inc. Characteristics subject to change without notice Figure 5b. Adjustable Gain Circuit 5 Doc. No. MD-2121 Rev. E CAT5120, CAT5121, CAT5122 PACKAGE OUTLINE DRAWINGS SC-70 6-Lead (SD) (1)(2) SYMBOL D e e E1 E MIN MAX A 0.80 1.10 A1 0.00 0.10 A2 0.80 1.00 b 0.15 0.30 c 0.10 0.18 D 1.80 2.00 2.20 E 1.80 2.10 2.40 E1 1.15 1.25 1.35 e L 0.65 BSC 0.26 L1 0.36 0.46 0.42 REF L2 TOP VIEW NOM 0.15 BSC θ 0° 8° θ1 4° 10° θ1 A2 A θ θ1 b L L1 A1 SIDE VIEW c 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. Angles in degrees. (2) Complies with JEDEC standard MS-203. Doc. No. MD-2121 Rev. E 6 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5120, CAT5121, CAT5122 SOT-23 6-Lead (TB) (1)(2) D e E1 E SYMBOL MIN A 0.90 A1 0.00 A2 0.90 1.45 0.15 1.15 1.30 0.30 0.50 c 0.08 0.22 D 2.90 BSC E 2.80 BSC E1 1.60 BSC 0.95 BSC L 0.30 L1 0.45 0.60 0.60 REF L2 TOP VIEW MAX b e PIN #1 IDENTIFICATION NOM 0.25 REF θ 0º 4º 8º θ1 5º 10º 15º θ2 5º 10º 15º θ1 A2 A θ b θ2 L1 A1 SIDE VIEW L2 L c 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. Angles in degrees. (2) Complies with JEDEC standard MO-178. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 7 Doc. No. MD-2121 Rev. E CAT5120, CAT5121, CAT5122 SC-70 5-Lead (SD) (1)(2) SYMBOL D e e E1 E MIN MAX A 0.80 1.10 A1 0.00 0.10 A2 0.80 1.00 b 0.15 0.30 c 0.10 0.18 D 1.80 2.00 2.20 E 1.80 2.10 2.40 E1 1.15 1.25 1.35 e L TOP VIEW NOM 0.65 BSC 0.26 0.36 L1 0.42 REF L2 0.15 BSC 0.46 θ 0° 8° θ1 4° 10° θ1 A2 A θ θ1 b L L1 A1 SIDE VIEW c 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. Angles in degrees. (2) Complies with JEDEC standard MS-203. Doc. No. MD-2121 Rev. E 8 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5120, CAT5121, CAT5122 SOT-23 5-Lead (TB) (1)(2) D SYMBOL E1 E e TOP VIEW NOM MAX A 0.90 1.45 A1 0.00 0.15 A2 0.90 b 0.30 0.50 c 0.08 0.22 1.15 D 2.90 BSC E 2.80 BSC E1 1.60 BSC e 0.95 BSC L PIN #1 IDENTIFICATION MIN 0.30 1.30 0.45 L1 0.60 REF L2 0.25 REF 0.60 θ 0º 4º 8º θ1 5º 10º 15º θ2 5º 10º 15º θ1 A2 A θ b θ2 L1 A1 SIDE VIEW L2 L c 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. Angles in degrees. (2) Complies with JEDEC standard MO-178. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 9 Doc. No. MD-2121 Rev. E CAT5120, CAT5121, CAT5122 EXAMPLE OF ORDERING INFORMATION Prefix CAT Device # 5120 Suffix SD Optional Company ID (1) I -10 – G Temperature Range I = Industrial (-40ºC to 85ºC) Product Number 5120 5121 5122 Resistance -10: 10kΩ -50: 50kΩ -00: 100kΩ T3 Tape & Reel T: Tape & Reel 3: 3,000/Reel Lead Finish Blank: Matte-Tin G: NiPdAu Package SD: SC-70 TB: SOT-23 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 finish is NiPdAu. (3) The device used in the example above is a CAT5120SDI-10-GT3 (SC-70, Industrial Temperature, 10kΩ, NiPdAu, Tape & Reel, 3,000/Reel). (4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. Doc. No. MD-2121 Rev. E 10 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5120, CAT5121, CAT5122 ORDERING INFORMATION Part Number Resistor [kΩ] Pin Package Quantity per Reel CAT5120SDI-10-GT3 10 SC70-6 3,000 CAT5120TBI-10-T3 10 SOT23-6 3,000 CAT5120TBI-10-GT3 10 SOT23-6 3,000 CAT5120SDI-50-GT3 50 SC70-6 3,000 CAT5120TBI-50-T3 50 SOT23-6 3,000 CAT5120TBI-50-GT3 50 SOT23-6 3,000 CAT5120SDI-00-GT3 100 SC70-6 3,000 CAT5120TBI-00-T3 100 SOT23-6 3,000 CAT5120TBI-00-GT3 100 SOT23-6 3,000 CAT5121SDI-10-GT3 10 SC70-6 3,000 CAT5121TBI-10-T3 10 SOT23-6 3,000 CAT5121TBI-10-GT3 10 SOT23-6 3,000 CAT5121SDI-50-GT3 50 SC70-6 3,000 CAT5121TBI-50-T3 50 SOT23-6 3,000 CAT5121TBI-50-GT3 50 SOT23-6 3,000 CAT5121SDI-00-GT3 100 SC70-6 3,000 CAT5121TBI-00-T3 100 SOT23-6 3,000 CAT5121TBI-00-GT3 100 SOT23-6 3,000 CAT5122SDI-10-GT3 10 SC70-5 3,000 CAT5122TBI-10-T3 10 SOT23-5 3,000 CAT5122TBI-10-GT3 10 SOT23-5 3,000 CAT5122SDI-50-GT3 50 SC70-5 3,000 CAT5122TBI-50-T3 50 SOT23-5 3,000 CAT5122TBI-50-GT3 50 SOT23-5 3,000 CAT5122SDI-00-GT3 100 SC70-5 3,000 CAT5122TBI-00-T3 100 SOT23-5 3,000 CAT5122TBI-00-GT3 100 SOT23-5 3,000 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 11 Doc. No. MD-2121 Rev. E REVISION HISTORY Date Rev. 10-March-05 A Initial Issue 27-Sept-06 B Update Electrical Characteristics C Update Ordering Information Update Package Outlines Add Example of Ordering Information Add SOT-23 5 Lead package drawing Update SOT-23 6 Lead package drawing 12-March-08 D Update Package Outline Drawings Update Ordering Information Add MD- to document number Add Top Mark Code link 29-May-08 E Delete 10,000 per reel option Update Document Layout 12-March-07 Reason CAT5120, CAT5121, CAT5122 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-2121 Revision: E Issue date: 05/29/08