Semiconductor Components Industries, LLC, 2013
July, 2013 − Rev. 7
1Publication Order Number:
CAT5127/D
CAT5127, CAT5129
32‐tap Digital
Potentiometer (POT)
Description
The CAT5127/CAT5129 are single digital POTs designed as an
electronic replacement for mechanical potentiometers and trim pots.
Ideal for automated adjustments on high volume production lines, they
are also well suited for applications where equipment requiring
periodic adjustment is either difficult to access or located in a hazardous
or remote environment.
The CAT5127 contains a 32-tap series resistor array connected
between two terminals RH and RL. The CAT5129 contains a 32-tap
series resistor array connected between two terminals RH and GND.
An up/down counter and decoder that are controlled by three input
pins, determines which tap is connected to the wiper. The wiper
setting, stored in nonvolatile memory, is not lost when the device is
powered down and is automatically reinstated when power is returned.
The wiper can be adjusted to test new system values without effecting
the stored setting. Wiper-control of the CAT5127/CAT5129 is
accomplished with three input control pins, CS, U/D, and INC. The
INC input increments the wiper in the direction which is determined
by the logic state of the U/D input. The CS input is used to select the
device and also store the wiper position prior to power down.
The devices are used as two-terminal variable resistors. Digital
POTs bring variability and programmability to a wide variety of
applications including control, parameter adjustments, and signal
processing.
Features
32-position Linear Taper Potentiometer
Non-volatile EEPROM Wiper Storage
Low Standby Current
Single Supply Operation: 2.5 V – 5.5 V
Increment Up/Down Serial Interface
Resistance Values: 10 kW, 50 kW and 100 kW
CAT5127 in MSOP Packages
CAT5129 in the 6-lead TSOT23 Package
This Device is Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
Automated Product Calibration
Remote Control Adjustments
Offset, Gain and Zero Control
Tamper-proof Calibrations
Contrast, Brightness and Volume Controls
Motor Controls and Feedback Systems
Programmable Analog Functions
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PIN CONFIGURATIONS
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
ORDERING INFORMATION
MSOP−8
Z SUFFIX
CASE 846AD
TSOT−23
TD SUFFIX
CASE 419AF
(Top Views)
CAT5129
VCC
RH
INC
U/D
GND
CS
VCC
CS
RL
NC
INC
U/D
RH
GND
11
MSOP (Z)
TSOT−23 (TD)
1
1
CAT5127
CAT5127, CAT5129
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2
Figure 1. Functional Diagrams
Control
and
Memory
POR
GND
Control
and
Memory
POR
GND
VCC
RH
RL
RP
(U/D)
(INC)
(CS)
CAT5127 CAT5129
VCC
RH
(U/D)
(INC)
(CS)
Table 1. PIN DESCRIPTIONS
Name Function
CAT5127
MSOP/TDFN
CAT5129
SOT23
INC Increment Control 1 4
U/D Up/Down Control 2 3
RHPotentiometer High Terminal 3 5
GND Ground 4 2
NC No Connect 5−
RLPotentiometer Low Terminal 6−
CS Chip Select 7 1
VCC Supply Voltage 8 6
DEVICE DESCRIPTION
INC: Increment Control Input
The INC input moves the wiper in the up or down
direction determined by the condition of the U/D input.
U/D: Up/Down Control Input
The U/D input controls the direction of the wiper
movement. When in a high state and CS is low, any
high-to-low transition on INC will cause the wiper to move
one increment toward the RH terminal. When in a low state
and CS is low, any high-to-low transition on INC will cause
the wiper to move one increment towards the RL terminal.
RH: High End Potentiometer Terminal
RH is the high end terminal of the potentiometer. It is not
required that this terminal be connected to a potential greater
than the RL terminal. Voltage applied to the RH terminal
cannot exceed the supply voltage, VCC or go below ground,
GND.
RL: Low End Potentiometer Terminal (CAT5127 only)
RL is the low end terminal of the potentiometer. It is not
required that this terminal be connected to a potential less
than the RH terminal. Voltage applied to the RL terminal
cannot exceed the supply voltage, VCC or go below ground,
GND. RL and RH are electrically interchangeable.
CS: Chip Select
The chip select input is used to activate the control input
of the device and is active low. When in a high state, activity
on the INC and U/D inputs will not affect or change the
position of the wiper. CAT5127 has an internal pull-up
resistor on the CS input pin.
VCC: Supply Input for the device.
CAT5127, CAT5129
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DEVICE OPERATION
The CAT5127 operates like a digitally controlled variable
resistor with RH and RL equivalent to the high and low
terminals. There are 32 available tap positions including the
resistor end points, RH and RL. There are 31 resistor
elements connected in series between the RH and RL
terminals.
The CAT5129 operates like a digitally controlled variable
resistor with RH equivalent to the high terminal. There are 32
available tap positions including the resistor end points, RH
and GND. There are 31 resistor elements connected in series
between the RH and GND terminals.
Operation is controlled by three inputs, INC, U/D and CS.
These inputs control a five-bit up/down counter whose
output is decoded to select the wiper position. The selected
wiper position can be stored in nonvolatile memory using
the INC and CS inputs.
With CS set LOW, the device is selected and will respond
to the U/D and INC inputs. HIGH to LOW transitions on
INC will increment or decrement the wiper (depending on
the state of the U/D input and five-bit counter). The wiper,
when at either end terminal, acts like its mechanical
equivalent and does not move beyond the last position. The
value of the counter is stored in nonvolatile memory
whenever CS transitions HIGH while the INC input is also
HIGH. When the device is powered-down, the last stored
wiper counter position is maintained in the nonvolatile
memory. When power is restored, the contents of the memory
are recalled and the counter is set to the value stored.
With INC set low, the device may be de-selected and
powered down without storing the current wiper position in
nonvolatile memory. This allows the system to always
power up to a preset value stored in nonvolatile memory.
Table 2. OPERATION MODES
INC CS U/D Operation
High to Low Low High Wiper toward H
High to Low Low Low Wiper toward L/GND
High Low to High XStore Wiper Position
Low Low to High XNo Store, Return to Standby
X High X Standby
Figure 2. Variable Resistor Equivalent Circuit
RH
RL/GND
CH
CL
CAT5127, CAT5129
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Table 3. ABSOLUTE MAXIMUM RATINGS
Parameters Ratings Units
Supply Voltage
VCC to GND −0.5 to +7
V
Inputs
CS to GND
INC to GND
U/D to GND
H to GND
L to GND
W to GND
−0.5 to VCC +0.5
−0.5 to VCC +0.5
−0.5 to VCC +0.5
−0.5 to VCC +0.5
−0.5 to VCC +0.5
−0.5 to VCC +0.5
V
Operating Ambient Temperature
Commercial (‘C’ or Blank suffix)
Industrial (‘I’ suffix)
0 to 70
−40 to +85
C
Junction Temperature +150 C
Storage Temperature −65 to 150 C
Lead Soldering (10 s max) +300 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.
Table 4. RELIABILITY CHARACTERISTICS
Symbol Parameter Test Method Min Typ Max Units
VZAP (Note 1) ESD Susceptibility MIL−STD−883, Test Method 3015 2000 V
ILTH (Notes 1, 2) Latch-up JEDEC Standard 17 100 mA
TDR Data Retention MIL−STD−883, Test Method 1008 100 Years
NEND Endurance MIL−STD−883, Test Method 1003 1,000,000 Stores
1. This parameter is tested initially and after a design or process change that affects the parameter.
2. Latch-up protection is provided for stresses up to 100 mA on address and data pins from −1 V to VCC + 1 V
3. These parameters are periodically sampled and are not 100% tested.
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Table 5. DC ELECTRICAL CHARACTERISTICS (VCC = +2.5 V to +5.5 V unless otherwise specified)
Symbol Parameter Conditions Min Typ Max Units
POWER SUPPLY
VCC Operating Voltage Range 2.5 5.5 V
ICC1 CAT5127
Supply Current (Increment)
VCC = 5.5 V, f = 1 MHz, IW = 0 260 mA
VCC = 3.3 V, f = 1 MHz, IW = 0 150 mA
CAT5129
Supply Current (Increment)
VCC = 5.5 V, f = 1 MHz, IW = 0 160 mA
VCC = 3.3 V, f = 1 MHz, IW = 0 50 mA
ICC2 Supply Current (Write) Programming, VCC = 5.5 V 300 600 mA
Programming, VCC = 3.3 V 150 400 mA
ISB1
(Note 4)
Supply Current (Standby) CS = VCC − 0.3 V
U/D, INC = VCC or GND
0.35 1 mA
LOGIC INPUTS
IIH CAT5127 Input Leakage Current U/D, INC = VCC 1mA
CS = VCC − 0.3 V 1mA
CAT5129 Input Leakage Current VIN = VCC 1mA
IIL CAT5127 Input Leakage Current U/D, INC = 0 −1mA
CS = 0 −120 mA
CAT5129 Input Leakage Current VIN = 0 V −1mA
VIH2 CMOS High Level Input Voltage 2.5 V VCC 5.5 V VCC x 0.7 VCC + 0.3 V
VIL2 CMOS Low Level Input Voltage −0.3 VCC x 0.2 V
VIH1 CAT5129 TTL High Level Input
Voltage
3.6 V VCC 5.5 V 2 VCC V
VIL1 CAT5129 TTL Low Level Input Voltage 0 0.8 V
Table 6. POTENTIOMETER CHARACTERISTICS
Symbol Parameter Conditions Min Typ Max Units
RPOT Potentiometer Resistance −10 Device 10 kW
−50 Device 50
−00 Device 100
RTOL Pot Resistance Tolerance 20 %
VRH Voltage on RH pin 0 VCC V
VRL Voltage on RL pin 0 VCC V
RES Resolution 3.2 %
INL Integral Linearity Error 0.5 1 LSB
DNL Differential Linearity Error 0.25 0.5 LSB
RWi Wiper Resistance VCC = 5 V 70 100 W
VCC = 2.5 V 150 200 W
TCRPOT (Note 6) TC of Pot Resistance 30 300 ppm/C
TCRATIO (Note 6) Ratiometric TC 3 20 ppm/C
VN (Note 6) Noise 100 kHz / 1 kHz 8/24 nV/Hz
CH/CL/CW (Note 6) Potentiometer Capacitances 8/8/25 pF
Fc (Note 6) Frequency Response Passive Attenuator, 10 kW1.7 MHz
4. Latch-up protection is provided for stresses up to 100 mA on address and data pins from −1 V to VCC + 1 V
5. IW = source or sink
6. These parameters are periodically sampled and are not 100% tested.
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Table 7. AC TEST CONDITIONS
VCC Range 2.5 V VCC 5.5 V
Input Pulse Levels 0.2 x VCC to 0.7 x VCC
Input Rise and Fall Times 10 ns
Input Reference Levels 0.5 x VCC
Table 8. AC OPERATING CHARACTERISTICS (VCC = +2.5 V to +5.5 V, VH = VCC, VL = 0 V, unless otherwise specified)
Symbol Parameter Min Typ (Note 7) Max Units
tCI CS to INC Setup 100 ns
tDI U/D to INC Setup 50 ns
tID U/D to INC Hold 100 ns
tIL INC LOW Period 250 ns
tIH INC HIGH Period 250 ns
tIC INC Inactive to CS Inactive 1ms
tCPH CS Deselect Time (NO STORE) 100 ns
tCPH CS Deselect Time (STORE) 10 ms
tIR INC to RH Change 1 5 ms
tCYC INC Cycle Time 1ms
tR, tF (Note 8) INC Input Rise and Fall Time 500 ms
tPU (Note 8) Power-up to Wiper Stable 1 ms
tWR Store Cycle 2 5 ms
90% 90%
10%
(store)
Figure 3. A.C. Timing
RH
U/D
INC
CS
tCI
tIR
tFtR
MI (Note 9)
tCPH
tIC
tID
tDI
tCYC
tIH
tIL
7. Typical values are for TA = 25C and nominal supply voltage.
8. This parameter is periodically sampled and not 100% tested.
9. MI in the A.C. Timing diagram refers to the minimum incremental change in the W output due to a change in the wiper position.
CAT5127, CAT5129
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APPLICATION INFORMATION
(a) resistive divider (b) variable resistance (c) two−port
Figure 4. Potentiometer Configurations
Applications
+
–
+
–
+
–
(−)
(+)
+2.5 V
10
1
2
3
4
5
6
7
8
9
11
+5 V
555
+5 V
0.01 mF
8
3
5
4
6
21
}
}
7
C
0.01 mF
0.003 mF
CAT5127
CAT5127
3
6
CAT5127
+5 V
28
1
7
4
CAT5127 6
3
10 k
820
11 kW
6.8 mF
GND
SD
1 mF
2952
FB 1.23 V
100 kW
0.1 mF
+
–
+
–
+5 V +5 V
}
}
pR (1−p)R
2
27
7
4
4
33
+2.5 V
A1
66
A2
1 M
330
330
63
LT1097
+5 V
28
1
7
4
+5 V
28
1
7
4
+5 V
28
1
7
4
Figure 5. Programmable Instrumentation Amplifier Figure 6. Programmable Sq. Wave Oscillator (555)
Figure 7. Programmable Voltage Regulator Figure 8. Programmable I to V Convertor
A1 = A2 = A3 = 1/4 LM 6064
R2 = R3 = R4 = 5 kW
RPOT = 10 kW
R4
R3
A2
R4
R3
VO
A3
R2
R2
R1
V2
V1
A1
R3
R2
VOUT
R1
VO(REG)
VIN(UNREG)
SHUTDOWN
pRPOT
(1−p)RPOT
R2
R1
RA
RB
VO
IS
CAT5127, CAT5129
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Table 9. ORDERING INFORMATION (Notes 10, 11)
Device Orderable Part Number Resistor [kW]Top Marking Package/Pins Shipping†
CAT5127 CAT5127ZI−10−GT3 10 ABNA MSOP−83000 / Tape & Reel
CAT5127ZI−50−GT3 (Note 13) 50 ABNB MSOP−83000 / Tape & Reel
CAT5129 CAT5129TDI−10GT3 10 SJym (Note 14) TSOT23−63000 / Tape & Reel
CAT5129TDI−00GT3 100 SVym (Note 14) TSOT23−63000 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
10.All packages are RoHS-compliant (Lead-free, Halogen-free).
11. The standard lead finish is NiPdAu.
12.For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
13.Contact factory for availability.
14.y = Production year (digit), m = Production month (digit).
15.For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device
Nomenclature document, TND310/D, available at www.onsemi.com.
CAT5127, CAT5129
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PACKAGE DIMENSIONS
MSOP 8, 3x3
CASE 846AD
ISSUE O
E1E
A2
A1 e b
D
c
A
TOP VIEW
SIDE VIEW END VIEW
L1
L2
L
DETAIL A
DETAIL A
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-187.
SYMBOL MIN NOM MAX
q
θ
A
A1
A2
b
c
D
E
E1
e
L
0º 6º
L2
0.05
0.75
0.22
0.13
0.40
2.90
4.80
2.90
0.65 BSC
0.25 BSC
1.10
0.15
0.95
0.38
0.23
0.80
3.10
5.00
3.10
0.60
3.00
4.90
3.00
L1 0.95 REF
0.10
0.85
CAT5127, CAT5129
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PACKAGE DIMENSIONS
TSOT−23, 6 LEAD
CASE 419AF
ISSUE O
E1 E
A2
A1
e
b
D
c
A
TOP VIEW
SIDE VIEW END VIEW
L1
LL2
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-193.
SYMBOL
θ
MIN NOM MAX
q
A
A1
A2
b
c
D
E
E1
e
L
0º 8º
L1
L2
0.01
0.80
0.30
0.12
0.30
0.05
0.87
0.15
2.90 BSC
2.80 BSC
1.60 BSC
0.95 TYP
0.40
0.60 REF
0.25 BSC
1.00
0.10
0.90
0.45
0.20
0.50
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limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications
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PUBLICATION ORDERING INFORMATION
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5817−1050
CAT5127/D
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P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
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