H CAT5120, CAT5121, CAT5122 EE GEN FR ALO 16-Tap MiniPot™ Digitally Programmable Potentiometers with 2-Wire Interface LE A D F R E ETM FEATURES ■ 0.3µA Ultra-low supply current ■ 2-Wire up/down serial interface ■ Single-supply operation: 2.7 V to 5.5 V Ω, 50kΩ Ω and 100kΩ Ω ■ Resistance values: 10kΩ, ■ Glitchless switching between resistor taps ■ Available in SC70 and SOT-23 packages ■ Power-on reset to midscale APPLICATIONS ■ LCD screen adjustment ■ Gain adjustment ■ Volume control ■ Line impedance matching ■ Mechanical potentiometer replacement DESCRIPTION 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 32-tap points that are digitally controlled through a 2-wire up/down serial interface. PIN CONFIGURE 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. FUNCTIONAL DIAGRAM H VDD 1 VDD 1 6 H 5 H VDD GND GND 2 5 W GND 2 4 CS U/D 3 CAT5120 U/D 3 CAT5122 CS 4 CS UP/DN Counter 16-Position Decoder W U/D VDD 1 6 H GND 2 5 L L CAT5121 U/D 3 4 CS Top View © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. 2121, Rev. A CAT5120/5121/5122 PIN DESCRIPTION Pin Number Pin Name Pin Function CAT5120 CAT5121 CAT5122 1 1 1 VDD 2 2 2 GND Ground 3 3 3 U/D Up/Down Control Input. With CS low, a low-to-high transition increments or decrements the wiper position. 4 4 4 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. - 5 - L Low Terminal of Resistor 5 - - W Wiper Terminal of Resistor 6 6 5 H High Terminal of Resistor Doc. No. 2121, Rev. A 2 Power Supply CAT5120/5121/5122 ORDERING INFORMATION Ordering Part Number Top Mark Pin Package Parts Per Reel CAT5120SBI-10-T Resistor K 10 JE_ 6 Lead SC70 3k CAT5120SBI-10-T10 10 JE_ 6 Lead SC70 10k CAT5120TPI-10-T 10 JEYM 6 Lead SOT-23 3k CAT5120TPI-10-T10 10 JEYM 6 Lead SOT-23 10k CAT5120SBI-50-T 50 JF_ 6 Lead SC70 3k CAT5120SBI-50-T10 50 JF_ 6 Lead SC70 10k CAT5120TPI-50-T 50 JFYM 6 Lead SOT-23 3k CAT5120TPI-50-T10 50 JFYM 6 Lead SOT-23 10k CAT5120SBI-00-T 100 JGYM 6 Lead SC70 3k CAT5120SBI-00-T10 100 JG_ 6 Lead SC70 10k CAT5120TPI-00-T 100 JGYM 6 Lead SOT-23 3k CAT5120TPI-00-T10 100 JGYM 6 Lead SOT-23 10k CAT5121SBI-10-T 10 JH_ 6 Lead SC70 3k CAT5121SBI-10-T10 10 JH_ 6 Lead SC70 10k CAT5121TPI-10-T 10 JHYM 6 Lead SOT-23 3k CAT5121TPI-10-T10 10 JHYM 6 Lead SOT-23 10k CAT5121SBI-50-T 50 JJ_ 6 Lead SC70 3k CAT5121SBI-50-T10 50 JJ_ 6 Lead SC70 10k CAT5121TPI-50-T 50 JJYM 6 Lead SOT-23 3k CAT5121TPI-50-T10 50 JJYM 6 Lead SOT-23 10k CAT5121SBI-00-T 100 JK_ 6 Lead SC70 3k CAT5121SBI-00-T10 100 JK_ 6 Lead SC70 10k CAT5121TPI-00-T 100 JKYM 6 Lead SOT-23 3k CAT5121TPI-00-T10 100 JKYM 6 Lead SOT-23 10k CAT5122SBI-10-T 10 JB_ 5 Lead SC70 3k CAT5122SBI-10-T10 10 JB_ 5 Lead SC70 10k CAT5122TPI-10-T 10 JBYM 5 Lead SOT-23 3k CAT5122TPI-10-T10 10 JBYM 5 Lead SOT-23 10k CAT5122SBI-50-T 50 JC_ 5 Lead SC70 3k CAT5122SBI-50-T10 50 JC_ 5 Lead SC70 10k CAT5122TPI-50-T 50 JCYM 5 Lead SOT-23 3k CAT5122TPI-50-T10 50 JCYM 5 Lead SOT-23 10k CAT5122SBI-00-T 100 JD_ 5 Lead SC70 3k CAT5122SBI-00-T10 100 JD_ 5 Lead SC70 10k CAT5122TPI-00-T 100 JDYM 5 Lead SOT-23 3k CAT5122TPI-00-T10 10 0 JDYM 5 Lead SOT-23 10k 3 Doc. No. 2121, Rev. A CAT5120/5121/5122 ORDERING INFORMATION (CON’T) Ordering Part Number Resistor K Top Mark Pin Package Parts Per Reel CAT5120SDI-10-T 10 KC_ 6 Lead SC70 green 3k CAT5120SDI-10-T10 10 KC_ 6 Lead SC70 green 10k CAT5120TBI-10-T 10 KCYM 6 Lead SOT-23 green 3k CAT5120TBI-10-T10 10 KCYM 6 Lead SOT-23 green 10k CAT5120SDI-50-T 50 KD_ 6 Lead SC70 green 3k CAT5120SDI-50-T10 50 KD_ 6 Lead SC70 green 10k CAT5120TBI-50-T 50 KDYM 6 Lead SOT-23 green 3k CAT5120TBI-50-T10 50 KDYM 6 Lead SOT-23 green 10k CAT5120SDI-00-T 100 KE_ 6 Lead SC70 green 3k CAT5120SDI-00-T10 100 KE_ 6 Lead SC70 green 10k CAT5120TBI-00-T 100 KEYM 6 Lead SOT-23 green 3k CAT5120TBI-00-T10 100 KEYM 6 Lead SOT-23 green 10k CAT5121SDI-10-T 10 KF_ 6 Lead SC70 green 3k CAT5121SDI-10-T10 10 KF_ 6 Lead SC70 green 10k CAT5121TBI-10-T 10 KFYM 6 Lead SOT-23 green 3k CAT5121TBI-10-T10 10 KFYM 6 Lead SOT-23 green 10k CAT5121SDI-50-T 50 KG_ 6 Lead SC70 green 3k CAT5121SDI-50-T10 50 KG_ 6 Lead SC70 green 10k CAT5121TBI-50-T 50 KGYM 6 Lead SOT-23 green 3k CAT5121TBI-50-T10 50 KGYM 6 Lead SOT-23 green 10k CAT5121SDI-00-T 100 KH_ 6 Lead SC70 green 3k CAT5121SDI-00-T10 100 KH_ 6 Lead SC70 green 10k CAT5121TBI-00-T 100 KHYM 6 Lead SOT-23 green 3k CAT5121TBI-00-T10 100 KHYM 6 Lead SOT-23 green 10k CAT5122SDI-10-T 10 KY_ 5 Lead SC70 green 3k CAT5122SDI-10-T10 10 KY_ 5 Lead SC70 green 10k CAT5122TBI-10-T 10 KYYM 5 Lead SOT-23 green 3k CAT5122TBI-10-T10 10 KYYM 5 Lead SOT-23 green 10k CAT5122SDI-50-T 50 KA_ 5 Lead SC70 green 3k CAT5122SDI-50-T10 50 KA_ 5 Lead SC70 green 10k CAT5122TBI-50-T 50 KAYM 5 Lead SOT-23 green 3k CAT5122TBI-50-T10 50 KAYM 5 Lead SOT-23 green 10k CAT5122SDI-00-T 100 KB_ 5 Lead SC70 green 3k CAT5122SDI-00-T10 100 KB_ 5 Lead SC70 green 10k CAT5122TBI-00-T 100 KBYM 5 Lead SOT-23 green 3k CAT5122TBI-00-T10 100 KBYM 5 Lead SOT-23 green 10k Doc. No. 2121, Rev. A 4 CAT5120/5121/5122 ABSOLUTE MAXIMUM RATINGS VDD to GND........................................... -0.3 V to +6 V Operating Temperature Range ........... -40°C to +85˚C All Other Pins to GND .............. -0.3 V to (VDD + 0.3) V Junction Temperature ......................................+150˚C Input and Output Latch-Up Immunity ............ +200 mA Storage Temperature Range ............ -65˚C to +150˚C Maximum Continuous Current into H, L and W Soldering Temperature (soldering, 10s) .......... +300˚C 100kΩ ................................................................... +0.6 mA *(derate 3.1mW/˚C above TA = +70˚C) 50kΩ ...................................................................... +1.3 mA COMMENT 10kΩ ...................................................................... +1.3 mA 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. Continuous Power Dissipation (TA = +70˚C) 5-pin SC70* .................................................... 247 mW 6-pin SC70* .................................................... 245 mW ELECTRICAL CHARACTERISTICS (VDD = 2.7 V to 5.5 V, VH = VDD, VL = 0, TA = -40˚C to 85˚C. Typical values are at VDD = 2.7 V, TA = 25˚C, unless otherwise noted). Symbol Parameter Conditions Min Typ Max Units DC Performance Resolution 16 End-to-End Resistance TCR Taps CAT5120 80 100 120 CAT5121 40 50 60 CAT5122 8 10 12 kΩ End-to-End Resistance Tempco 200 ppm/˚ C Ratiometric Resistance Tempco 5 ppm/˚ C INL Integral Nonlinearity +0.5 LSB DNL Differential Nonlinearity +0.5 LSB RW Zero/Full-Scale Error +0.1 +0.5 LSB Wiper Resistance 200 600 Ω Digital Inputs VIH Input High Voltage VIL Input Low Voltage 0.7 x VDD V 0.3 x VDD V Timing Characteristics (Figures 1, 2) tCU U/D Mode to CS Setup 25 ns tCI CS to U/D Step Setup 50 ns tIC CS to U/D Step Hold 25 ns tIL U/D Step Low Period 25 ns tIH U/D Step High Period 25 ns fTOGGLE Up/Down Toggle Rate tSETTLE Output Settling Time (1) (2) 1 100kΩ variable resistor configuration, CL = 10pF 100kΩ potentiometer configuration, CL = 10pF 5 MHz 1 0.25 µs Doc. No. 2121, Rev. A CAT5120/5121/5122 ELECTRICAL CHARACTERISTICS VDD = 2.7 V to 5.5 V, VH = VDD, VL = 0, TA = -40˚C to 85˚C. Typical values are at VDD = 2.7 V, TA = 25˚C, unless otherwise noted. Symbol Parameter Conditions Min Typ Max Units 5.5 V 25 µA 1 µA Power Supplies VDD Supply Voltage IDD Active Supply Current (3) ISD 2.7 Standby Supply Current (4) VDD = +5V 0.3 Notes: 1. Up/Down Toggle Rate: fTOGGLE = 2. 3. 4. 1 tSETTLE Typical setting times are dependant on end-to-end resistance. Supply current taken while changing wiper tap, fTOGGLE = 1MHz. Supply current taken while wiper position is fixed. TYPICAL OPERATING CHARACTERISTICS TA = 25˚C, unless otherwise noted. VDD = 2.7V VDD = 5.5V 0 4 8 10 12 14 16 WIPER POSITION VDD = 5.5V VDD = 2.7V Doc. No. 2121, Rev. A 6 CAT5120/5121/5122 FUNCTIONAL DESCRIPTION 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 CAT5120/5121/5122 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 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 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. 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. 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. 7 Doc. No. 2121, Rev. A CAT5120/5121/5122 APPLICATIONS INFORMATION 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. The Minipots are intended for circuits requiring digitally controlled adjustable resistance, such as LCD contrast control, where voltage biasing adjusts the display contrast. 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 CAT5120 V OUT V OUT CAT5121 L L Figure 5a. Adjustable Gain Circuit Figure 5b. Adjustable Gain Circuit VCC V CC V IN V IN V OUT V OUT H W H L L Doc. No. 2121, Rev. A CAT5120 CAT5121 8 CAT5120/5121/5122 PACKAGE OUTLINES SC70 0.15(.006) C D A E/2 E1/2 E E1 0.15(.006) C A PIN #1 N1 N2 e B SEE DETAIL A A2 A U1 SEATING PLANE A1 .10(.004) C PIN LEAD COUNT CODE 5 6 N1 2 2 N2 3 3 N3 4 4 N4 5 N5 5 6 H 015(.0059) GAGE PLANE (b) b1 BASE METAL C c1 c U SECTION A-A DETAIL A S Y M B O L A NOTE: 1. 2. 3. CONTROLLING DIMENSION: MILLIMETER. CONVERTED INCH DIMENSION ARE NOT NECESSARILY EXACT. DIMENSION "D" DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURR. MOLD FLASH, PROTRUSION OR GATE BURR SHALL NOT EXCEED 0.15MM (0.006") PER END. DIMENSION "E1" DOES NOT INCLUDE INTER-LEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.15MM (0.006") PER SIDE. THE PACKAGE TOP IS SMALLER THAN THE PACKAGE BOTTOM. DIMENSION D AND E1 ARE DETERMINED AT THE OUTERMOST EXPTREMES OF THE PLASTIC BODY EXCLUSIVE OF MOLD FLASH, TIE BAR BURRS, GATE BURRS ADN INTERLEAD FLASH, BUT INCLUDING ANY MISMATCH BETWEEN THE TOP AND BOTTOM OF THE PLASTIC BODY. 9 COMMON DIMENSIONS MILLIMETER MIN NOM MAX 0.80 1.10 DIMENSIONS INCH MIN 0.031 NOM - MAX 0.043 A1 0 - 0.10 0 - 0.004 A2 0.80 0.90 1.00 0.031 0.035 0.040 b 0.15 - 0.30 0.006 - 0.012 b1 0.15 0.20 0.25 0.006 0.008 0.010 c 0.08 - 0.25 0.003 - 0.010 c1 0.08 0.13 0.20 0.003 0.005 0.008 D 1.90 2.10 2.15 0.074 0.082 0.084 E 2.00 2.10 2.20 0.078 0.082 0.086 E1 1.15 1.25 1.35 0.045 0.050 0.055 0.0255 BSC 0.65 BSC e 0.0512 BSC 1.30 BSC e1 L 0.26 0.36 0.46 U 0˚ - U1 4˚ - 0.014 8˚ 0.010 0- - 0.018 8- 10˚ 4- - 10- Doc. No. 2121, Rev. A CAT5120/5121/5122 SOT-23 (AA OPTION) 3 4 aaa C 2X D H e1 A B D 5 N/2 +1 N B VIEW A-A SEE VIEW C E/2 E1/2 3 R1 E1 4 E R GAUGE PLANE L2 aaa C D L SEATING C PLANE 2X (L1) 1 2 N/2 bbb C 2X N/2 TIPS e 5 B NX b ddd M VIEW C (b) WITH METAL b1 CA BD c c1 BASE METAL SECTION B - B b 5 8 7 A 5 e/2 X X=A &/or B A X X=A &/or B ODD LEAD SIDES TOP VIEW A2 ccc C NX A1 EVEN LEAD SIDES TOP VIEW SEATING C PLANE A All Dimensions are in Millimeters Min Nom Max A — — 1.00 A1 0.01 0.05 0.10 A2 0.84 0.87 0.90 c 0.12 0.15 0.20 7 c1 0.08 0.13 0.16 7 Notes aaa 0.15 1,2 bbb 0.25 1,2 ccc 0.10 1,2 Variations AA 6 AB BA 2.90BSC 3,4 E 2.80BSC 3,4 b 0.30 — 0.45 0.30 — 0.45 0.22 E1 1.60BSC 3,4 b1 0.31 0.35 0.39 0.31 0.35 0.39 0.22 0.30 0.40 L1 0.60REF L2 0.25BSC 0.50 R 0.10 — — R1 0.10 — 0.25 0° 4° 8° θ 5. 6. 7. 8. Tolerances of Form and Position D L 4. Notes Min Nom Max Min Nom Max Min Nom Max Notes — 0.36 7,8 0.26 0.30 e 0.95BSC 0.95BSC 0.65BSC e1 1.90BSC 1.90BSC 1.95BSC N 6 5 8 Tolerances of Form and Position ddd 0.20 0.20 0.13 1,2 Notes: 1. Dimensions and tolerancing per ASME Y14.5M - 1994 2. Dimension are in mm. θ1 4° 10° 12° 3. Dimension D does not include mold flash, protrusions or gate burrs. Mold flash, protrusions or gate burrs shall not exceed 0.15mm per end. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.15mm per side. D and E1 dimensions are determined at Datum H. The package top may be smaller than the package bottom. Dimensions D and E1 are determined at the outermost extremes of the plastic body exclusive of mold flash, the bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. D and E1 dimensions are determined at Datum H. Datums A & B to be determined at Datum H. Package varation "AB" is a 5 lead version of the 6 lead variation "AA" where lead #5 has been removed from the 6 lead "AA" variation. These dimensions apply to the flat section of the lead between 0.08mm and 0.15mm from the lead tip. Dimension "b" does not include dambar protrusion. Allowable dambar protrusion shall be 0.08mm total in excess of the "b" dimension at maximum material condition. The dambar cannot be located on the lower radius of the foot. Minimum space between protrusion and an adjacent lead shall not be less than 0.07mm. Doc. No. 2121, Rev. A 10 CAT5120/5121/5122 REVISION HISTORY Date Rev. Reason 03/10/2005 A Initial Release Copyrights, Trademarks and Patents Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: DPP ™ AE2 ™ MiniPot™ 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 408.542.1000. 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 1250 Borregas Avenue Sunnyvale, CA 94089 Phone: 408.542.1000 Fax: 408.542.1200 www.catsemi.com Publication #: Revison: Issue date: Type: 11 2121 A 03/10/05 Initial Release Doc. No. 2121, Rev. A