CAT5120, CAT5121, CAT5122 16-Tap MiniPot™ Digitally Programmable Potentiometers with 2-Wire Interface Features DEscription ■ 0.3µA Ultra-low supply 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 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. ■ Resistance values: 10kΩ, 50kΩ and 100kΩ ■ Available in SC70 and SOT-23 packages 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 SC70 and SOT-23 packages. Applications ■ LCD screen adjustment ■ Volume control ■ Mechanical potentiometer replacement ■ Gain adjustment ■ Line impedance matching Functional Diagram H VDD CS UP-DOWN COUNTER For Ordering Information details, see page 10. U/D 16-POSITION DECODER GND W Pin Configuration sC70 sOT-23 sC70 sOT-23 VDD 6 H VDD GND 2 5 W GND 2 L Pin Descriptions 5 H Name CAT5120 U/D 3 CAT5122 4 CS U/D 3 4 CS VDD Power Supply GND Ground U/D Up/Down Control Input. With CS low, a lowto-high transition increments or decrements the wiper position. CS Chip Select Input. A high-to-low CS transition determines the mode: increment if U/D is high, or decrement if U/D is low. sC70 sOT-23 VDD 6 H GND 2 5 L CAT5121 U/D 3 4 CS © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Description L Low Terminal of Resistor W Wiper Terminal of Resistor H High Terminal of Resistor Doc. No. 2121, Rev. C CAT5120, CAT5121, CAT5122 Absolute Maximum Ratings(1) VDD to GND -0.3V to +6V All Other Pins to GND -0.3V to (VDD + 0.3)V Input and Output Latch-Up Immunity ±200mA Maximum Continuous Current into H, L and W 100kΩ 50kΩ 10kΩ ±0.6mA ±1.3mA ±1.3mA Continuous Power Dissipation (TA = +70ºC) 5-pin SC70(2) 6-pin SC70(2) 247mW 245mW Operating Temperature Range -40ºC to +85ºC Junction Temperature +150ºC Storage Temperature Range -65ºC to +150ºC Soldering Temperature (soldering, 10s) +300ºC 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 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 Taps 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 Integral Nonlinearity INL Differential Nonlinearity DNL Zero/Full-Scale Error Wiper Resistance RW kΩ 200 ppm/ºC 5 ppm/ºC ±0.5 LSB ±0.5 LSB ±0.1 ±0.5 LSB 200 600 Ω Digital Inputs Input High Voltage VIH Input Low Voltage VIL Doc. No. 2121, Rev. C 0.7 x VDD V 0.3 x VDD V © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5120, CAT5121, CAT5122 Electrical CHARACTERISTICS (continued) 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 Timing Characteristics (Figures 1, 2) U/DMode to CS Setup tCU 25 ns CS to U/D Step Setup tCI 50 ns CS to U/D Step Hold tIC 25 ns U/D Step Low Period tIL 25 ns tIH 25 ns U/D Step High Period Up/Down Toggle Rate Output Settling Time (1) fTOGGLE (2) tSETTLE 1 100kΩ variable resistor configuration, CL = 10pF 1 100kΩ potentiometer configuration, CL = 10pF 0.25 MHz μs Power Supply Supply Voltage VDD Active Supply Current (3) Standby Supply Current 2.7 IDD (4) ISD VDD = +5V 0.3 5.5 V 25 µA 1 µA Notes: (1) Up/Down Toggle Rate: fTOGGLE = 1/tSETTLE (2) Typical setting times are dependant on end-to-end resistance. (3) Supply current taken while changing wiper tap, fTOGGLE = 1MHz. (4) Supply current taken while wiper position is fixed. typical operating CHARACTERISTICS TA = 25ºC, unless otherwise noted. VDD = 2.7V 50K VDD = 5.5V 0 4 8 12 16 20 24 28 32 WIPER POSITION VDD= 5.5V VDD= 2.7V © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Doc No. 2121, Rev. C CAT5120, CAT5121, CAT5122 Functional Description The CAT5120/5121/5122 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. Three end-to-end resistance values are available: 10kΩ, 50kΩ and 100kΩ. The CS and U/D inputs control the position of the wiper along the resistor array. When CS transitions from high to low, the part will go into increment mode if U/D input is high, and into decrement mode when U/D input is low. Once the mode is set, the device will remain in that mode until CS goes high again. A low-to-high transition at the U/D pin will increment or decrement the wiper position depending on the current mode (Figures 1 and 2). 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). When the CS input transitions to high (serial interface 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 mode. The serial interface is only active when CS is low. All parts in this family feature power-on reset (POR) circuitry that sets the wiper position to midscale at powerup. By default, the chip is in the increment mode. Figure 1. Serial Interface Timing Diagram, 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 2. Serial Interface Timing Diagram, Decrement Mode CS t IC t CU t IH U/D t IL t CI W t SETTLE t SETTLE Note: "W" is not a digital signal. It represents wiper transitions. Doc. No. 2121, Rev. C © 2007 by 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. Figure 3. Positive LCD Bias Control Figure 4. Positive LCD Bias Control +5V +5V H H 30V 30V W VOUT VOUT CAT5121 L CAT5120 L Figure 5a. Adjustable Gain Circuit Figure 5b. Adjustable Gain Circuit V CC VCC VIN VIN VOUT VOUT H W H L CAT5120 CAT5121 L © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Doc No. 2121, Rev. C CAT5120, CAT5121, CAT5122 Package Information SC-70 6 LEAD e e E1 b D A2 A GAUGE PLANE c L A1 θ L2 L1 SYMBOL MIN A 0.80 A1 0.00 A2 0.70 b 0.15 c 0.08 NOM 1.10 0.10 0.90 2.00 BSC E 2.10 BSC E1 1.25 BSC e 0.65 BSC L 0.26 0.36 0.25 0.46 For current Tape and Reel information, download the PDF file from: www.catsemi.com/documents/tapeandreel.pdf 0.42 REF L2 θ 1.00 0.30 0.20 D L1 MAX 0.15 BSC 0° 8° Notes: 1. Dimension are in mm. 2. Dimension are inclusive of planting. 3. Dimension are exclusive of mold flash & metal burr. 4. All specification comply to JDEC M0-203 Doc. No. 2121, Rev. C © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5120, CAT5121, CAT5122 SC-70 5 LEAD e e E1 b D A2 A GAUGE PLANE c L A1 θ L2 L1 SYMBOL MIN NOM MAX A 0.80 1.10 A1 0.00 0.10 A2 0.80 1.00 b 0.15 0.30 c 0.10 D 1.80 2.00 2.20 E 1.15 1.25 1.35 E1 1.80 2.10 2.40 e L 0.65 BSC 0.26 L1 0.36 0.46 For current Tape and Reel information, download the PDF file from: www.catsemi.com/documents/tapeandreel.pdf 0.42 REF L2 θ 0.18 0.15 BSC 0° 8° Notes: (1) Dimension are in millimeter. (2) All specification comply to JDEC M0-203 © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Doc No. 2121, Rev. C CAT5120, CAT5121, CAT5122 PACKAGE INFORMATION SOT-23 6 LEAD SYMBOL MIN A 0.90 1.45 A1 0.00 0.15 A2 0.90 1.30 b 0.30 0.50 c 0.08 0.22 D 2.90 BSC E 2.80 BSC E1 1.60 BSC e 0.95 BSC L 0.30 L1 θ SIDE VIEW 0.45 MAX 0.60 0.60 REF L2 TOP VIEW NOM 0.25 BSC 0° 8° θ1 10° θ2 10° END VIEW For current Tape and Reel information, download the PDF file from: www.catsemi.com/documents/tapeandreel.pdf Notes: (1) All dimensions in millimeters. Angles in degrees. (2) Complies with JEDEC standard MO-178. Doc. No. 2121, Rev. C © 2007 by Catalyst Semiconductor, Inc. Doc. No. 139 / 031607 Characteristics subject to change without notice CAT5120, CAT5121, CAT5122 PACKAGE INFORMATION SOT-23 5 LEAD SYMBOL MIN A 0.90 1.45 A1 0.00 0.15 A2 0.90 1.30 b 0.30 0.50 c 0.08 0.22 D 2.90 BSC E 2.80 BSC E1 1.60 BSC e 0.95 BSC L 0.30 L1 θ SIDE VIEW 0.45 MAX 0.60 0.60 REF L2 TOP VIEW NOM 0.25 BSC 0° 8° θ1 10° θ2 10° END VIEW For current Tape and Reel information, download the PDF file from: www.catsemi.com/documents/tapeandreel.pdf Notes: (1) All dimensions in millimeters. Angles in degrees. (2) Complies with JEDEC standard MO-178. © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Doc No. 2121, Rev. C Doc. No. 111 / 031607 CAT5120, CAT5121, CAT5122 EXAMPLE OF Ordering Information Prefix Device # CAT 5120 Company ID Product Number 5120 5121 5122 Suffix SD I Package SD: SC70 TB: SOT-23 -10 -G Resistance -10: 10kΩ -50: 50kΩ -00: 100kΩ Temperature Range I = Industrial (-40°C to 85°C) T10 Tape & Reel T: Tape & Reel 3: 3000/Reel 10: 10000/Reel Lead Finish Blank: Matte-Tin G: NiPdAu Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard lead finish is NiPdAu. (2) The device used in the example above is a CAT5120SDI-10-GT10 (SC70, Industrial Temperature range, NiPdAu, Tape and Reel). (3) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. Doc. No. 2121, Rev. C 10 © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT5120, CAT5121, CAT5122 Ordering Information Resistor [kΩ] Package Marking Pin Package CAT5120SDI-10-GT3 10 KC_ SC70-6 3,000 CAT5120SDI-10-GT10 10 KC_ SC70-6 10,000 CAT5120TBI-10-T3 10 KCYM SOT23-6 3,000 CAT5120TBI-10-T10 10 KCYM SOT23-6 10,000 CAT5120TBI-10-GT3 10 KCYM SOT23-6 3,000 CAT5120TBI-10-GT10 10 KCYM SOT23-6 10,000 CAT5120SDI-50-GT3 50 KD_ SC70-6 3,000 CAT5120SDI-50-GT10 50 KD_ SC70-6 10,000 CAT5120TBI-50-T3 50 KDYM SOT23-6 3,000 CAT5120TBI-50-T10 50 KDYM SOT23-6 10,000 CAT5120TBI-50-GT3 50 KDYM SOT23-6 3,000 CAT5120TBI-50-GT10 50 KDYM SOT23-6 10,000 CAT5120SDI-00-GT3 100 KE_ SC70-6 3,000 CAT5120SDI-00-GT10 100 KE_ SC70-6 10,000 CAT5120TBI-00-T3 100 KEYM SOT23-6 3,000 CAT5120TBI-00-T10 100 KEYM SOT23-6 10,000 CAT5120TBI-00-GT3 100 KEYM SOT23-6 3,000 CAT5120TBI-00-GT10 100 KEYM SOT23-6 10,000 CAT5121SDI-10-GT3 10 KF_ SC70-6 3,000 CAT5121SDI-10-GT10 10 KF_ SC70-6 10,000 CAT5121TBI-10-T3 10 KFYM SOT23-6 3,000 CAT5121TBI-10-T10 10 KFYM SOT23-6 10,000 CAT5121TBI-10-GT3 10 KFYM SOT23-6 3,000 CAT5121TBI-10-GT10 10 KFYM SOT23-6 10,000 CAT5121SDI-50-GT3 50 KG_ SC70-6 3,000 CAT5121SDI-50-GT10 50 KG_ SC70-6 10,000 CAT5121TBI-50-T3 50 KGYM SOT23-6 3,000 CAT5121TBI-50-T10 50 KGYM SOT23-6 10,000 CAT5121TBI-50-GT3 50 KGYM SOT23-6 3,000 CAT5121TBI-50-GT10 50 KGYM SOT23-6 10,000 CAT5121SDI-00-GT3 100 KH_ SC70-6 3,000 CAT5121SDI-00-GT10 100 KH_ SC70-6 10,000 CAT5121TBI-00-T3 100 KHYM SOT23-6 3,000 CAT5121TBI-00-T10 100 KHYM SOT23-6 10,000 CAT5121TBI-00-GT3 100 KHYM SOT23-6 3,000 CAT5121TBI-00-GT10 100 KHYM SOT23-6 10,000 Part Number © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 11 Quantity per Reel Doc No. 2121, Rev. C CAT5120, CAT5121, CAT5122 Ordering Information (continue) Resistor [kΩ] Package Marking Pin Package CAT5122SDI-10-GT3 10 KY_ SC70-5 3,000 CAT5122SDI-10-GT10 10 KY_ SC70-5 10,000 CAT5122TBI-10-T3 10 KYYM SOT23-5 3,000 CAT5122TBI-10-T10 10 KYYM SOT23-5 10,000 CAT5122TBI-10-GT3 10 KYYM SOT23-5 3,000 CAT5122TBI-10-GT10 10 KYYM SOT23-5 10,000 CAT5122SDI-50-GT3 50 KA_ SC70-5 3,000 CAT5122SDI-50-GT10 50 KA_ SC70-5 10,000 CAT5122TBI-50-T3 50 KAYM SOT23-5 3,000 CAT5122TBI-50-T10 50 KAYM SOT23-5 10,000 CAT5122TBI-50-GT3 50 KAYM SOT23-5 3,000 CAT5122TBI-50-GT10 50 KAYM SOT23-5 10,000 CAT5122SDI-00-GT3 100 KB_ SC70-5 3,000 CAT5122SDI-00-GT10 100 KB_ SC70-5 10,000 CAT5122TBI-00-T3 100 KBYM SOT23-5 3,000 CAT5122TBI-00-T10 100 KBYM SOT23-5 10,000 CAT5122TBI-00-GT3 100 KBYM SOT23-5 3,000 CAT5122TBI-00-GT10 100 KBYM SOT23-5 10,000 Part Number Doc. No. 2121, Rev. C 12 Quantity per Reel © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice REVISION HISTORY Date Rev. Reason 03/10/2005 A Initial Issue 09/27/2006 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 03/12/2007 Copyrights, Trademarks and Patents Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Beyond Memory ™, DPP ™, EZDim™, MiniPot™ and Quad Mode™ Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. 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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: 2121 Revision: C Issue date: 03/12/07