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CAT5120, CAT5121, CAT5122
16-Tap MiniPotTM Digitally Programmable Potentiometers with 2-Wire Interface
FeATures

DesCrIPTIOn
CAT520/52/522 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 6-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 SC70 and SOT-23 packages.
0.3A 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 Resistance values: 10k, 50k and 100k Available in sC70 and sOT-23 packages
APPlICATIOns

lCD screen adjustment Volume control Mechanical potentiometer replacement Gain adjustment line impedance matching
FunCTIOnAl DIAGrAM
H VDD GND
UP-DOWN COUNTER
For Ordering Information details, see page 10.
16-POSITION DECODER
CS
W
U/D
PIn COnFIGurATIOn
sC70 sOT-23
VDD 6H VDD
sC70 sOT-23
5H
L
PIn DesCrIPTIOns
name Description Power Supply Ground Up/Down Control Input. With CS low, a lowto-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
Doc. No. 22, Rev. C
GND 2
5W
GND 2
VDD
CAT5122
4 CS
CAT5120
U/D 3 4 CS U/D 3
GND U/D
sC70 sOT-23
CS
VDD 6H
GND 2
5L
L W H
CAT5121
U/D 3 4 CS
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT5120, CAT5121, CAT5122
AbsOluTe MAxIMuM rATInGs(1) 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 SC70(2) 6-pin SC70(2) Operating Temperature Range Junction Temperature Storage Temperature Range Soldering Temperature (soldering, 0s) 247mW 245mW -40C to +85C +50C -65C to +50C +300C -0.3V to +6V -0.3V to (VDD + 0.3)V 200mA 0.6mA .3mA .3mA
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.mW/C above TA = +70C
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 (-0) 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. 200 TCR 6 75 37.5 7.5 00 50 0 200 5 0.5 0.5 0.5 600 25 62.5 2.5 ppm/C ppm/C LSB LSB LSB k Taps symbol Conditions Min Typ Max units
Doc. No. 22, Rev. C
2
(c) 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 = -40C to 85C. Typical values are at VDD = 2.7V, TA = 25C, unless otherwise noted. Parameter U/DMode 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 Up/Down Toggle Rate Output Settling Time Power supply Supply Voltage Active Supply Current
(3) (4) ()
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)
100k variable resistor configuration, CL = 10pF 100k potentiometer configuration, CL = 10pF 2.7 VDD = +5V 0.3
MHz s
(2)
0.25
VDD IDD ISD
5.5 25
V A A
Standby Supply Current
notes: () Up/Down Toggle Rate: fTOGGLE = /tSETTLE (2) Typical setting times are dependant on end-to-end resistance. (3) Supply current taken while changing wiper tap, fTOGGLE = MHz. (4) Supply current taken while wiper position is fixed.
TyPICAl OPerATInG CHArACTerIsTICs TA = 25C, 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
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
3
Doc No. 22, Rev. C
CAT5120, CAT5121, CAT5122 FunCTIOnAl DesCrIPTIOn
The CAT5120/5121/5122 consist of a fixed resistor and a wiper contact with 6-tap points that are digitally controlled through a 2-wire up/down serial interface. Three end-to-end resistance values are available: 10k, 50k and 100k. The CAT520 is designed to operate as a potentiometer. In this configuration, the low terminal of the resistor array is connected to ground (pin 2). The CAT522 performs as a variable resistor. In this device, the wiper terminal and high terminal of the resistor array is connected at pin 5. The CAT52 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 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 powerup. By default, the chip is in the increment mode.
Figure 1. serial Interface Timing Diagram, Increment Mode
CS
t CU t IL
U/D t CI t SETTLE
t IC
t IH
t SETTLE
W
Note: "W" is not a digital signal. It represents wiper transitions.
Figure 2. serial Interface Timing Diagram, Decrement Mode
CS
t CU t IH U/D
t IC
t IL t CI W t SETTLE
t SETTLE
Note: "W" is not a digital signal. It represents wiper transitions.
Doc. No. 22, Rev. C
4
(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. AlTernATIVe POsITIVe lCD bIAs COnTrOl Use an op amp to provide buffering and gain on the output of the CAT520. 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 CAT52. ADjusTAble GAIn Figure 5 shows how to use the variable resistor to digitally adjust the gain of a noninverting op amp configuration. Connect the CAT52 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.
Figure 3. Positive lCD bias Control
+5V
Figure 4. Positive lCD bias Control
+5V H
H 30V W CAT5120 L
30V
VOUT CAT5121 L
VOUT
Figure 5a. Adjustable Gain Circuit
V CC VIN VOUT
Figure 5b. Adjustable Gain Circuit
VCC VIN VOUT
H W L H
CAT5121 L
CAT5120
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
5
Doc No. 22, Rev. C
CAT5120, CAT5121, CAT5122 PACkAGe InFOrMATIOn SC-70 6 LEAD
e e
E1
b
D
A2
A
c
GAUGE PLANE
A1
L L1
L2
SYMBOL A A1 A2 b c D E E1 e L L1 L2
MIN 0.80 0.00 0.70 0.15 0.08
NOM
MAX 1.10 0.10
0.90 0.20 2.00 BSC 2.10 BSC 1.25 BSC 0.65 BSC
1.00 0.30 0.25
0.26
0.36 0.42 REF 0.15 BSC
0.46
0
8
For current Tape and reel information, download the PDF file from: www.catsemi.com/documents/tapeandreel.pdf
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. 22, Rev. C
6
(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
c
GAUGE PLANE
A1
L L1
L2
SYMBOL A A1 A2 b c D E E1 e L L1 L2
MIN 0.80 0.00 0.80 0.15 0.10 1.80 1.15 1.80 0.26
NOM
MAX 1.10 0.10 1.00 0.30 0.18
2.00 1.25 2.10 0.65 BSC 0.36 0.42 REF 0.15 BSC
2.20 1.35 2.40 0.46
0
8
For current Tape and reel information, download the PDF file from: www.catsemi.com/documents/tapeandreel.pdf
Notes: (1) Dimension are in millimeter. (2) All specification comply to JDEC M0-203
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
7
Doc No. 22, Rev. C
CAT5120, CAT5121, CAT5122
PACKAGE INFORMATION
SOT-23 6 LEAD
SYMBOL A A1 A2 b c D E E1 e L L1
TOP VIEW
MIN 0.90 0.00 0.90 0.30 0.08
NOM
MAX 1.45 0.15 1.30 0.50 0.22
2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 0.30 0.45 0.60 REF 0.25 BSC 0 10 10 8 0.60
L2 1 2
SIDE VIEW
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. 22, Rev. C
8
(c) 2007 by Catalyst Semiconductor, Inc. Doc. No. without notice Characteristics subject to change 139 / 031607
CAT5120, CAT5121, CAT5122
PACKAGE INFORMATION
SOT-23 5 LEAD
SYMBOL A A1 A2 b c D E E1 e L L1
TOP VIEW
MIN 0.90 0.00 0.90 0.30 0.08
NOM
MAX 1.45 0.15 1.30 0.50 0.22
2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 0.30 0.45 0.60 REF 0.25 BSC 0 10 10 8 0.60
L2 1 2
SIDE VIEW
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.
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
Doc. No. 111 / 031607
Doc No. 22, Rev. C
CAT5120, CAT5121, CAT5122 exAMPle OF OrDerInG InFOrMATIOn
Prefix CAT Device # 5120 SD Suffix I -10 -G T10
Company ID Product Number 5120 5121 5122
Package SD: SC70 TB: SOT-23
Resistance -10: 10k -50: 50k -00: 100k
Tape & Reel T: Tape & Reel 3: 3000/Reel 10: 10000/Reel
Temperature Range I = Industrial (-40C to 85C)
Lead Finish Blank: Matte-Tin G: NiPdAu
notes: () 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. 22, Rev. C
0
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT5120, CAT5121, CAT5122 OrDerInG InFOrMATIOn
Part number CAT520SDI-0-GT3 CAT520SDI-0-GT0 CAT520TBI-0-T3 CAT520TBI-0-T0 CAT520TBI-0-GT3 CAT520TBI-0-GT0 CAT520SDI-50-GT3 CAT520SDI-50-GT0 CAT520TBI-50-T3 CAT520TBI-50-T0 CAT520TBI-50-GT3 CAT520TBI-50-GT0 CAT520SDI-00-GT3 CAT520SDI-00-GT0 CAT520TBI-00-T3 CAT520TBI-00-T0 CAT520TBI-00-GT3 CAT520TBI-00-GT0 CAT52SDI-0-GT3 CAT52SDI-0-GT0 CAT52TBI-0-T3 CAT52TBI-0-T0 CAT52TBI-0-GT3 CAT52TBI-0-GT0 CAT52SDI-50-GT3 CAT52SDI-50-GT0 CAT52TBI-50-T3 CAT52TBI-50-T0 CAT52TBI-50-GT3 CAT52TBI-50-GT0 CAT52SDI-00-GT3 CAT52SDI-00-GT0 CAT52TBI-00-T3 CAT52TBI-00-T0 CAT52TBI-00-GT3 CAT52TBI-00-GT0 resistor [k] 0 0 0 0 0 0 50 50 50 50 50 50 00 00 00 00 00 00 0 0 0 0 0 0 50 50 50 50 50 50 00 00 00 00 00 00 Package Marking KC_ KC_ KCYM KCYM KCYM KCYM KD_ KD_ KDYM KDYM KDYM KDYM KE_ KE_ KEYM KEYM KEYM KEYM KF_ KF_ KFYM KFYM KFYM KFYM KG_ KG_ KGYM KGYM KGYM KGYM KH_ KH_ KHYM KHYM KHYM KHYM Pin Package SC70-6 SC70-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SC70-6 SC70-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SC70-6 SC70-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SC70-6 SC70-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SC70-6 SC70-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SC70-6 SC70-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 Quantity per reel 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
Doc No. 22, Rev. C
CAT5120, CAT5121, CAT5122 OrDerInG InFOrMATIOn (COnTInue)
Part number CAT522SDI-0-GT3 CAT522SDI-0-GT0 CAT522TBI-0-T3 CAT522TBI-0-T0 CAT522TBI-0-GT3 CAT522TBI-0-GT0 CAT522SDI-50-GT3 CAT522SDI-50-GT0 CAT522TBI-50-T3 CAT522TBI-50-T0 CAT522TBI-50-GT3 CAT522TBI-50-GT0 CAT522SDI-00-GT3 CAT522SDI-00-GT0 CAT522TBI-00-T3 CAT522TBI-00-T0 CAT522TBI-00-GT3 CAT522TBI-00-GT0 resistor [k] 0 0 0 0 0 0 50 50 50 50 50 50 00 00 00 00 00 00 Package Marking KY_ KY_ KYYM KYYM KYYM KYYM KA_ KA_ KAYM KAYM KAYM KAYM KB_ KB_ KBYM KBYM KBYM KBYM Pin Package SC70-5 SC70-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SC70-5 SC70-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SC70-5 SC70-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 Quantity per reel 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000 3,000 0,000
Doc. No. 22, Rev. C
2
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
reVIsIOn HIsTOry
Date 03/0/2005 0/27/2006 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
03/2/2007
C
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Document No: 22 Revision: C Issue date: 03/2/07

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