CATALYST CAT5121TPI-10-T

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.
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Publication #:
Revison:
Issue date:
Type:
11
2121
A
03/10/05
Initial Release
Doc. No. 2121, Rev. A