CAT5110, CAT5118,
CAT5119, CAT5123,
CAT5124, CAT5125
32‐tap Digital
Potentiometers (POTs)
with 2‐wire Interface
Description
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CAT5110/18/19/23/24/25 linear-taper digital POTs 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.
The CAT5110 and CAT5125 are configured as potentiometers. The
CAT5118/19/23/24 are configured as variable resistors.
Three resistance values are available: 10 kW, 50 kW and 100 kW. All
devices are available in space-saving 5-pin and 6-pin SOT−23
packages. The CAT5110/18/19 are also available in the SC−70
package.
Features
SC−70
SD SUFFIX
CASE 419AD
SOT−23
TB SUFFIX
CASE 527AJ
SC−70
SD SUFFIX
CASE 419AC
SOT−23
TB SUFFIX
CASE 527AH
PIN CONNECTIONS
SOT−23
V
DD
1
GND 2
6 H
V
DD
1
SC−70
6 H
5 W
0.3
mA
Ultra-low Standby Current
Single-supply Operation: 2.7 V to 5.5 V
Glitchless Switching between Resistor Taps
Power-on Reset to Midscale
2-wire Up/Down Serial Interface
Resistance Values: 10 kW, 50 kW and 100 kW
Low Wiper Resistance: 80
W
for CAT5123, CAT5124, CAT5125
CAT5110, CAT5118, CAT5119 Available in SC−70
These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
LCD Screen Adjustment
Volume Control
Mechanical Potentiometer Replacement
Gain Adjustment
Line Impedance Matching
5 W GND 2
CAT5110
U/D 3
CAT5125
4 CS U/D 3
CAT5110
4 CS
SOT−23
V
DD
1
GND 2
5 H
V
DD
1
GND 2
SC−70
5 H
Applications
CAT5118
U/D 3
CAT5123
4 CS U/D 3
CAT5118
4 CS
SOT−23
V
DD
1
GND 2
6 H
5 L
V
DD
1
GND 2
SC−70
6 H
5 L
CAT5119
CAT5119
4 CS
U/D 3
CAT5124
4 CS U/D 3
(Top Views)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
Semiconductor Components Industries, LLC, 2013
June, 2013
−
Rev. 13
1
Publication Order Number:
CAT5110/D
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
H
V
DD
GND
32−POSITION
DECODER
UP−DOWN
COUNTER
CS
W
U/D
L
Figure 1. Functional Diagram
Table 1. PIN DESCRIPTIONS
Pin Number
CAT5110/
CAT5125
1
2
3
4
−
5
6
CAT5118/
CAT5123
1
2
3
4
−
−
6
CAT5119/
CAT5124
1
2
3
4
5
−
6
Pin
Name
V
DD
GND
U/D
CS
L
W
H
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
Description
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameters
V
DD
to GND
All Other Pins to GND
Input and Output Latch−Up Immunity
Maximum Continuous Current into H, L and W
100 kW
50 kW
10 kW
Continuous Power Dissipation (T
A
= +70C)
5-pin SC−70 (Note 1)
6-pin SC−70 (Note 1)
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Soldering Temperature (soldering, 10 sec)
Ratings
−0.3
to +6
−0.3
to (V
DD
+ 0.3)
200
0.6
1.3
1.3
247
245
−40
to +85
+150
−65
to +150
+300
mW
Units
V
V
mA
mA
C
C
C
C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Derate 3.1 mW/C above T
A
= +70C
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2
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
Table 3. ELECTRICAL CHARACTERISTICS
Parameter
DC PERFORMANCE
Resolution
End-to-End Resistance (−00)
End-to-End Resistance (−50)
End-to-End Resistance (−10)
End-to-End Resistance Tempco
TC
R
CAT5110/18/19
CAT5123/24/25
Ratiometric Resistance Tempco
Integral Nonlinearity
Differential Nonlinearity
Full-Scale Error
Zero-Scale Error
Wiper Resistance
R
W
CAT5110/18/19
CAT5123/24/25
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
TIMING CHARACTERISTICS
(Figures 7, 8)
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
Up/Down Toggle Rate (Note 2)
Output Settling Time (Note 3)
t
CU
t
CI
t
IC
t
IL
t
IH
f
TOGGLE
t
SETTLE
100 kW variable resistor
configuration, C
L
= 10 pF
100 kW potentiometer
configuration, C
L
= 10 pF
POWER SUPPLY
Supply Voltage
Active Supply Current (Note 4)
Standby Supply Current (Note 5)
2.
3.
4.
5.
V
DD
I
DD
I
SB
V
DD
= +5 V
0.3
2.7
5.5
25
1
V
mA
mA
25
50
25
25
25
1
1
0.25
ns
ns
ns
ns
ns
MHz
ms
V
IH
V
IL
0.7 x V
DD
0.3 x V
DD
V
V
200
80
INL
DNL
0.1
1
600
200
32
80
40
8
100
50
10
200
30
5
0.5
1
1
300
ppm/C
LSB
LSB
LSB
LSB
W
120
60
12
ppm/C
Taps
kW
(V
DD
= 2.7 V to 5.5 V, V
H
= V
DD
, V
L
= 0, T
A
=
−40C
to +85C. Typical values are at V
DD
= 2.7 V, T
A
= 25C, unless otherwise noted.)
Symbol
Conditions
Min
Typ
Max
Units
Up/Down Toggle Rate: f
TOGGLE
= 1 / t
SETTLE
Typical settling times are dependent on end-to-end resistance.
Supply current measureed while changing wiper tap, f
TOGGLE
= 1 MHz.
Supply current measureed while wiper position is fixed.
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3
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
TYPICAL OPERATING CHARACTERISTICS
(T
A
= 25C, unless otherwise noted.)
160
END−TO−END RESISTANCE
CHANGE (%)
140
120
R
W
(W)
100
80
60
40
20
0
0
5
10
CAT5123/5124/5125
CAT5110/5118/5119
1.5
1.0
0.5
0
−0.5
−1.0
−1.5
−50
CAT5110/5118/5119
CAT5123/5124/5125
V
DD
= 2.7 V
15
20
25
30
WIPER POSITION
0
50
100
TEMPERATURE (C)
Figure 2. Wiper Resistance vs. Wiper Position
120
100
RESISTANCE (kW)
100 k
CURRENT (mA)
80
60
40
20
0
50 k
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
10 k
1 3
5
7
9 11 13 15 17 19 21 23 25 27 29 31
TAP POSITION
0.05
Figure 3. Change in End-to-End Resistance vs.
Temperature
V
DD
= 5.5 V
V
DD
= 2.7 V
0
−50
0
50
TEMPERATURE (C)
100
150
Figure 4. W-to-L Resistance vs. Tap Position
Figure 5. Supply Current vs. Temperature
U/D
2 V/div
WIPER
OUTPUT
100 mV/div
200 ns/div
Figure 6. Tap-to-Tap Switching Transient
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4
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
FUNCTIONAL DESCRIPTION
The CAT5110/5118/5119/5123/5124/5125 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. Three end-to-end resistance values are available:
10 kW, 50 kW and 100 kW.
The CAT5110/5125 is designed to operate as a
potentiometer. In this configuration, the low terminal of the
resistor array is connected to ground (pin 2).
The CAT5118/5123 performs as a variable resistor. In this
device, the wiper terminal and high terminal of the resistor
array are connected at pin 5. The CAT5119/5124 is a similar
variable resistor, except the low terminal is connected to
pin 5.
Digital Interface Operation
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 7 and 8).
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
The devices 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.
CS
t
CU
t
IL
U/D
t
CI
t
SETTLE
W
Note: “W” is not a digital signal. It represents wiper transitions.
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.
t
IC
t
IH
t
SETTLE
Figure 7. Serial Interface Timing Diagram, Increment Mode
CS
t
CU
U/D
t
IL
W
t
CI
t
SETTLE
Note: “W” is not a digital signal. It represents wiper transitions.
t
SETTLE
t
IC
t
IH
Figure 8. Serial Interface Timing Diagram, Decrement Mode
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