CAT5110, CAT5118, CAT5119
CAT5123, CAT5124, CAT5125
32-Tap MiniPot™ Digitally Programmable
Potentiometers with 2-Wire Interface
FEATURES
0.3µA 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: 10kΩ, 50kΩ and 100kΩ
Low wiper resistance: 80Ω for
CAT5123, CAT5124, CAT5125
CAT5110, CAT5118, CAT5119 available in SC-70
DESCRIPTION
CAT5110/18/19/23/24/25 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.
The CAT5110 and CAT5125 are configured as
potentiometers. The CAT5118/19/23/24 are configured
as variable resistors.
Three resistance values are available: 10kΩ, 50kΩ and
100kΩ. 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.
APPLICATIONS
LCD screen adjustment
Volume control
Mechanical potentiometer replacement
Gain adjustment
Line impedance matching
FUNCTIONAL DIAGRAM
H
V
DD
GND
UP-DOWN
COUNTER
For Ordering Information details, see page 11.
32-POSITION
DECODER
CS
W
U/D
PIN CONFIGURATION
SOT-23
V
DD
1
6
H
V
DD
1
L
SOT-23
5
H
V
DD
1
SOT-23
6
H
GND 2
5 W
GND 2
GND 2
5 L
U/D 3
CAT5110
CAT5125
4
CS
U/D 3
CAT5118
CAT5123
4
CS
U/D 3
CAT5119
CAT5124
4
CS
SC-70
V
DD
1
6
H
V
DD
1
SC-70
5
H
V
DD
1
SC-70
6
H
GND 2
5 W
GND 2
GND 2
5 L
U/D 3
CAT5110
4
CS
U/D 3
CAT5118
4
CS
U/D 3
CAT5119
4
CS
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-2120 Rev. J
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
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
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
ABSOLUTE MAXIMUM RATINGS
(1)
Parameters
V
DD
to GND
All Other Pins to GND
Input and Output Latch-Up Immunity
Maximum Continuous Current into H, L and W
100kΩ
50kΩ
10kΩ
Continuous Power Dissipation (T
A
= +70ºC)
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 (V
DD
+ 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
ºC
ºC
ºC
ºC
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/ºC above T
A
= +70ºC
Doc. No. MD-2120 Rev. J
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
ELECTRICAL CHARACTERISTICS
V
DD
= 2.7V to 5.5V, V
H
= V
DD
, V
L
= 0, T
A
= -40ºC to
+85ºC.
Typical values are at V
DD
= 2.7V, T
A
= 25ºC, 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
Full-Scale Error
Zero-Scale Error
Wiper Resistance
Digital Inputs
Input High Voltage
Input Low Voltage
¯
¯¯
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
Symbol
Conditions
Min
32
80
40
8
Typ
Max
Units
Taps
100
50
10
200
30
5
±0.5
±0.1
120
60
12
300
±1
±1
1
ppm/ºC
ppm/ºC
LSB
LSB
LSB
LSB
Ω
600
200
kΩ
TC
R
CAT5110/18/19
CAT5123/24/25
INL
DNL
R
W
CAT5110/18/19
CAT5123/24/25
0.7 x V
DD
200
80
V
IH
V
IL
t
CU
t
CI
t
IC
t
IL
t
IH
f
TOGGLE
t
SETTLE
100kΩ variable resistor
configuration, C
L
= 10pF
100kΩ potentiometer
configuration, C
L
= 10pF
V
0.3 x V
DD
V
ns
ns
ns
ns
ns
1
1
μs
0.25
MHz
Timing Characteristics (Figures 1, 2)
25
50
25
25
25
Output Settling Time
(2)
Power Supply
Supply Voltage
Active Supply Current
(3)
(4)
V
DD
I
DD
I
SB
1
t
SETTLE
2.7
V
DD
= +5V
0.3
5.5
25
1
V
µA
µA
Standby Supply Current
Notes:
(1)
(2)
(3)
(4)
Up/Down Toggle Rate:
f
TOGGLE
=
Typical settling times are dependent on end-to-end resistance.
Supply current measured while changing wiper tap, f
TOGGLE
= 1MHz.
Supply current measured while wiper position is fixed.
3
Doc. No. MD-2120 Rev. J
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
TYPICAL OPERATING CHARACTERISTICS
T
A
= 25ºC, unless otherwise noted.
WIPER RESISTANCE vs.
WIPER POSITION
140
120
100
CAT5110/5118/5119
END-TO-END RESISTANCE % CHANGE
160
CHANGE IN END-TO-END RESISTANCE
vs. TEMPERATURE
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-50
CAT5110/5118/5119
CAT5123/5124/5125
W-TO-L RESISTANCE vs.
TAP POSITION
120
100
RESISTANCE (k• )
80
60
100k
R
W
(• )
80
60
40
20
0
0
5
CAT5123/5124/5125
50k
40
20
0
10k
V
DD
= 2.7V
10 15 20 25
WIPER POSTION
30
0
50
100
1 3 5 7 9 1113151719212325272931
TAP POSITION
TEMPERATURE (ºC)
SUPPLY CURRENT vs.
TEMPERATURE
0.45
0.40
0.35
V
DD
= 5.5V
TAP-TO-TAP
SWITCHING TRANSIENT
CURRENT (µA)
0.30
0.25
0.20
0.15
0.10
0.05
0.00
-50
0
50
100
150
V
DD
= 2.7V
U/D
2V/div
WIPER
OUTPUT
100mv/div
TEMPERATURE (ºC)
200ns/div
Doc. No. MD-2120 Rev. J
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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: 10kΩ, 50kΩ and 100kΩ.
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 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
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. MD-2120 Rev. J
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