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CAT5120, CAT5121, CAT5122
16-Tap MiniPotTM Digitally Programmable Potentiometers with 2-Wire Interface
FEATURES
0.3A 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: 10k, 50k and 100k Available in SC-70 and SOT-23 packages
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 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: 10k, 50k and 100k. These are available in space-saving 5-pin and 6-pin SC-70 and SOT-23 packages.
APPLICATIONS
LCD screen adjustment Volume control Mechanical potentiometer replacement Gain adjustment Line impedance matching
FUNCTIONAL DIAGRAM
H VDD GND
For Ordering Information details, see page 10.
16-POSITION DECODER
CS
UP-DOWN COUNTER
W
U/D
PIN CONFIGURATION
SC-70 SOT-23
VDD 1 6 H VDD 1
SC-70 SOT-23
5 H
L
PIN DESCRIPTIONS
Name VDD GND
4 CS
Description Power Supply Ground Up/Down Control Input. With CS low, a low-to-high transition increments or decrements the wiper position. 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. Low Terminal of Resistor Wiper Terminal of Resistor High Terminal of Resistor
GND 2
5W
GND 2
CAT5120
U/D 3 4 CS U/D 3
CAT5122
U/D
SC-70 SOT-23
VDD 1 6 H
CS L W H
GND 2
5L
CAT5121
U/D 3 4 CS
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
1
Doc. No. MD-2121 Rev. E
CAT5120, CAT5121, CAT5122
ABSOLUTE MAXIMUM RATINGS (1)
Parameters VDD to GND All Other Pins to GND Input and Output Latch-Up Immunity Maximum Continuous Current into H, L and W 100k 50k 10k Continuous Power Dissipation (TA = +70C) 5-pin SC-70(2) 6-pin SC-70(2) Operating Temperature Range Junction Temperature Storage Temperature Range Soldering Temperature (soldering, 10s) Ratings -0.3 to +6 -0.3 to (VDD + 0.3) 200 0.6 1.3 1.3 247 245 -40 to +85 +150 -65 to +150 +300 Units V V mA mA
mW C C C C
ELECTRICAL CHARACTERISTICS
VDD = 2.7V to 5.5V, VH = VDD, VL = 0, TA = -40C to +85C. Typical values are at VDD = 2.7V, TA = 25C, unless otherwise noted. Parameter DC Performance Resolution End-to-End Resistance (-00) End-to-End Resistance (-50) End-to-End Resistance (-10) End-to-End Resistance Tempco Ratiometric Resistance Tempco Integral Nonlinearity Differential Nonlinearity Zero/Full-Scale Error Wiper Resistance Digital Inputs Input High Voltage Input Low Voltage VIH VIL 0.7 x VDD 0.3 x VDD V V RW INL DNL 0.1 200 TCR 16 75 37.5 7.5 100 50 10 200 5 0.5 0.5 0.5 600 125 62.5 12.5 ppm/C ppm/C LSB LSB LSB k Taps Symbol Conditions Min Typ Max 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. (2) Derate 3.1mW/C above TA = +70C
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
2
Doc. No. MD-2121 Rev. E
CAT5120, CAT5121, CAT5122
ELECTRICAL CHARACTERISTICS (continued)
Parameter U/D Mode to CS Setup CS to U/D Step Setup CS to U/D Step Hold U/D Step Low Period U/D Step High Period (1) Up/Down Toggle Rate Output Settling Time Power Supply Supply Voltage Active Supply Current
(3) (4) (2)
Symbol tCU tCI tIC tIL tIH fTOGGLE tSETTLE
Conditions
Min 25 50 25 25 25
Typ
Max
Units ns ns ns ns ns
Timing Characteristics (Figures 1, 2)
1 100k variable resistor configuration, CL = 10pF 100k potentiometer configuration, CL = 10pF 2.7 VDD = +5V 0.3 1
MHz s
0.25
VDD IDD ISB
5.5 25 1
V A A
Standby Supply Current
TYPICAL OPERATING CHARACTERISTICS
TA = 25C, unless otherwise noted.
VDD= 2.7V
50K
VDD= 5.5V
0
4
8 12 16 20 24 WIPER POSITION
28
32 TEMPERATURE (C)
VDD= 5.5V
VDD= 2.7V
TEMPERATURE (C)
Notes: (1) (2) (3) (4) Up/Down Toggle Rate: fTOGGLE =
1 t SETTLE
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. 3
Doc. No. MD-2121 Rev. E
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
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 a2-wire up/down serial interface. Three end-to-end resistance values are available: 10k, 50k and 100k. 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). 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. Digital Interface Operation 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. 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). When the CS input transitions to high (serial interface inactive), the value of the counter is stored and the wiper position is maintained. Note that when the wiper reaches the maximum (or minimum) tap position, the wiper will not wrap around to the minimum (or maximum) position. 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.
CS
t CU t IL
U/D
t IC
t CI t SETTLE
W Note: "W" is not a digital signal. It represents wiper transitions.
t IH
t SETTLE
Figure 1. Serial Interface Timing Diagram, Increment Mode
CS
t CU t IH
U/D
t IC
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
(c) 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. 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. 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.
+5V
+5V H 30V W VOUT CAT5121 L 30V VOUT
H
CAT5120 L
Figure 3. Positive LCD Bias Control
Figure 4. Positive LCD Bias Control
V CC VIN VOUT VIN
VCC VOUT
H W L H
CAT5121 L
CAT5120
Figure 5a. Adjustable Gain Circuit
Figure 5b. Adjustable Gain Circuit
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
5
Doc. No. MD-2121 Rev. E
CAT5120, CAT5121, CAT5122
PACKAGE OUTLINE DRAWINGS
SC-70 6-Lead (SD)
(1)(2)
D e e
SYMBOL
MIN
NOM
MAX
A A1 A2 b c
E1 E
0.80 0.00 0.80 0.15 0.10 1.80 1.80 1.15 0.26 2.00 2.10 1.25 0.65 BSC 0.36 0.42 REF 0.15 BSC 0 4
1.10 0.10 1.00 0.30 0.18 2.20 2.40 1.35 0.46
D E E1 e L L1 L2 1
TOP VIEW
8 10
1
A2 A L L1
1
b
A1
c END VIEW
L2
SIDE 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
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT5120, CAT5121, CAT5122
SOT-23 6-Lead (TB)
(1)(2)
D e
SYMBOL
MIN
NOM
MAX
A A1 A2 b c
E1 E
0.90 0.00 0.90 0.30 0.08 2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 0.30 0.45 0.60 REF 0.25 REF 0 5 5 4 10 10 1.15
1.45 0.15 1.30 0.50 0.22
D E E1 e L
0.60
PIN #1 IDENTIFICATION TOP VIEW
L1 L2 1 2
8 15 15
1
A2
A
2
SIDE VIEW
b A1
L1
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.
(c) 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)
D e e
SYMBOL
MIN
NOM
MAX
A A1 A2 b c
E1 E
0.80 0.00 0.80 0.15 0.10 1.80 1.80 1.15 0.26 2.00 2.10 1.25 0.65 BSC 0.36 0.42 REF 0.15 BSC 0 4
1.10 0.10 1.00 0.30 0.18 2.20 2.40 1.35 0.46
D E E1 e L L1 L2 1
TOP VIEW
8 10
1
A2 A L L1
1
b
A1
c END VIEW
L2
SIDE 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
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT5120, CAT5121, CAT5122
SOT-23 5-Lead (TB)
(1)(2)
D
SYMBOL
MIN
NOM
MAX
A A1 A2 b
E1 E
0.90 0.00 0.90 0.30 0.08 2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 0.30 0.45 0.60 REF 0.25 REF 0 5 5 4 10 10 1.15
1.45 0.15 1.30 0.50 0.22
c D E E1 e
e PIN #1 IDENTIFICATION TOP VIEW
L L1 L2 1 2
0.60
8 15 15
1
A2
A
2
SIDE VIEW
b A1
L1
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.
(c) 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
(1)
I
-10
-
G
T3
Optional Company ID Product Number 5120 5121 5122
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 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, 10k, 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
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT5120, CAT5121, CAT5122
ORDERING INFORMATION
Part Number CAT5120SDI-10-GT3 CAT5120TBI-10-T3 CAT5120TBI-10-GT3 CAT5120SDI-50-GT3 CAT5120TBI-50-T3 CAT5120TBI-50-GT3 CAT5120SDI-00-GT3 CAT5120TBI-00-T3 CAT5120TBI-00-GT3 CAT5121SDI-10-GT3 CAT5121TBI-10-T3 CAT5121TBI-10-GT3 CAT5121SDI-50-GT3 CAT5121TBI-50-T3 CAT5121TBI-50-GT3 CAT5121SDI-00-GT3 CAT5121TBI-00-T3 CAT5121TBI-00-GT3 CAT5122SDI-10-GT3 CAT5122TBI-10-T3 CAT5122TBI-10-GT3 CAT5122SDI-50-GT3 CAT5122TBI-50-T3 CAT5122TBI-50-GT3 CAT5122SDI-00-GT3 CAT5122TBI-00-T3 CAT5122TBI-00-GT3 Resistor [k] 10 10 10 50 50 50 100 100 100 10 10 10 50 50 50 100 100 100 10 10 10 50 50 50 100 100 100 Pin Package SC70-6 SOT23-6 SOT23-6 SC70-6 SOT23-6 SOT23-6 SC70-6 SOT23-6 SOT23-6 SC70-6 SOT23-6 SOT23-6 SC70-6 SOT23-6 SOT23-6 SC70-6 SOT23-6 SOT23-6 SC70-5 SOT23-5 SOT23-5 SC70-5 SOT23-5 SOT23-5 SC70-5 SOT23-5 SOT23-5 Quantity per Reel 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000 3,000
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
11
Doc. No. MD-2121 Rev. E
REVISION HISTORY
Date 10-March-05 27-Sept-06 Rev. A B Reason Initial Issue Update Electrical Characteristics 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 Update Package Outline Drawings Update Ordering Information Add MD- to document number Add Top Mark Code link Delete 10,000 per reel option Update Document Layout
12-March-07
C
12-March-08
D
29-May-08
E
CAT5120, CAT5121, CAT5122
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-2121 Revision: E Issue date: 05/29/08

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