CAT5271, CAT5273
Dual 256‐position I
2
C
Compatible Digital
Potentiometers (POTs)
The CAT5271 and CAT5273 are dual 256-position digital
programmable linear taper potentiometers ideally suited for replacing
mechanical potentiometers and variable resistors.
The wiper settings are controlled through an I
2
C-compatible digital
interface. Upon power-up, the wiper assumes a midscale position and
may be repositioned anytime after the power is stable. The devices can
be programmed to go to a shutdown state during operation.
The CAT5271 and CAT5273 operate from 2.7 V to 5.5 V, while
consuming less than 2
mA.
This low operating current, combined with
a small package footprint, makes them ideal for battery-powered
portable applications.
The CAT5271 and CAT5273, designed as pin for pin replacements
for the AD5243 and AD5248, are offered in the 10-lead MSOP
package and operate over the
−40C
to +85C industrial temperature
range.
Features
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MSOP−10
Z SUFFIX
CASE 846AE
MARKING DIAGRAMS
ANCC
YMR
1
1
ANCE
YMR
1
PAYM
LXX
Dual 256-position
End-to-End Resistance: 50 kW, 100 kW
I
2
C Compatible Interface*
Power-on Preset to Midscale
Single Supply 2.7 V to 5.5 V
Low Temperature Coefficient 100 ppm/C
Low Power, I
DD
2
mA
max
Wide Operating Temperature
−40C
to +85C
MSOP−10 Package (3 mm
4.9 mm)
These Devices are Pb-Free, Halogen Free/BFR Free and are
RoHS Compliant
ANCC = CAT5721
−
50 kW
ANCE = CAT5721
−
100 kW
PA = CAT5273
−
50 kW*
Y = Production Year (Last Digit)
M = Production Month (1−9, O, N, D)
R = Revision
L = Assembly Location
XX = Last Two Digits of Assembly Lot Number
*Contact factory for availability of CAT5273
−
100 kW
PIN CONNECTIONS
B1
A1
W2
GND
V
DD
B1
AD0
W2
GND
V
DD
(Top Views)
1
CAT5273
1
CAT5271
W1
B2
A2
SDA
SCL
W1
B2
AD1
SDA
SCL
Typical Applications
Potentiometer Replacement
Transducer Adjustment of Pressure, Temperature, Position,
Chemical, and Optical Sensors
RF Amplifier Biasing
Gain Control and Offset Adjustment
*Two address decode pins (CAT5273 only) allowing
multiple devices on the same bus
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
Semiconductor Components Industries, LLC, 2013
July, 2013
−
Rev. 3
1
Publication Order Number:
CAT5271/D
CAT5271, CAT5273
VCC
I
2
C Interface
Wiper Control
Register 1
A1
W1
B1
VCC
Wiper Control
Register 1
I
2
C Interface
W1
B1
SCL
SDA
SCL
SDA
Wiper Control
Register 2
A2
W2
B2
Wiper Control
Register 2
W2
B2
GND
GND
Control Logic
AD0
AD1
Figure 1. CAT5271 Functional Block Diagram
Figure 2. CAT5273 Functional Block Diagram
Table 1. PIN FUNCTION DESCRIPTION
CAT5271
Pin No.
1
2
3
4
5
6
7
8
9
10
Pin Name
B1
A1
W2
GND
VDD
SCL
SDA
A2
B2
W1
B1 Terminal
A1 Terminal
W2 Terminal
Digital Ground
Positive Power Supply
Serial Clock Input
Serial Data Input / Output
A2 Terminal
B2 Terminal
W1 Terminal
Description
Pin Name
B1
AD0
W2
GND
VDD
SCL
SDA
AD1
B2
W1
B1 Terminal
Device Address Bit 0
W2 Terminal
Digital Ground
Positive Power Supply
Serial Clock Input
Serial Data Input / Output
Device Address Bit 1
B2 Terminal
W1 Terminal
CAT5273
Description
Table 2. ABSOLUTE MAXIMUM RATINGS
(Note 1)
Rating
V
DD
to GND
A1, B1, W1, A2, B2, W2 Voltage to GND
I
MAX
Digital Inputs and Output Voltage to GND
Operating Temperature Range
Maximum Junction Temperature (T
JMAX
)
Storage Temperature
Lead Temperature (Soldering, 10 sec)
Value
−0.3
to 6.5
V
DD
20
0 to 6.5
−40
to +85
150
−65
to +150
300
mA
V
C
C
C
C
Unit
V
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. Maximum terminal current is bounded by the maximum current handling of the switches, maximum power dissipation of the package, and
maximum applied voltage across any two of the A, B, and W terminals at a given resistance.
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CAT5271, CAT5273
Table 3. ELECTRICAL CHARACTERISTICS: 50 kW and 100 kW Versions
V
DD
= 2.7 V to 5.5 V; V
A
= V
DD
; V
B
= 0 V; –40C < T
A
< +85C; unless otherwise noted. (Note 2)
Parameter
DC CHARACTERISTICS
−
RHEOSTAT MODE
Resistor Differential Nonlinearity (Note 4)
Resistor Integral Nonlinearity (Note 4)
Nominal Resistor Tolerance (Note 5)
Resistance Temperature Coefficient
Wiper Resistance
R
WB
, V
A
= no connection (CAT5271)
R
WB
, V
A
= no connection (CAT5271)
T
A
= 25C
V
AB
= V
DD
, Wiper = no connection
V
DD
= 5 V, I
W
=
3
mA
V
DD
= 3 V, I
W
=
3
mA
DC CHARACTERISTICS
−
POTENTIOMETER DIVIDER MODE
Resolution
Differential Nonlinearity (Note 6)
Integral Nonlinearity (Note 6)
Voltage Divider Temperature Coefficient
Full-scale Error
Zero-scale Error
RESISTOR TERMINALS
Voltage Range (Note 7)
Capacitance (Note 8) A, B
Capacitance (Note 8) W
Common-mode Leakage (Note 8)
DIGITAL INPUTS
Input Logic High
Input Logic Low
Input Logic High
Input Logic Low
Input Current
POWER SUPPLIES
Power Supply Range
Supply Current
Power Dissipation (Note 8)
Power Supply Sensitivity
Bandwidth –3 dB
Total Harmonic Distortion
V
W
Settling Time (50 kW/100 kW)
V
IH
= 5 V or V
IL
= 0 V
V
IH
= 5 V or V
IL
= 0 V, V
DD
= 5 V
nV
DD
= +5 V
10%,
Code = Midscale
R
AB
= 50 kW / 100 kW, Code = 0x80
V
A
=1 V rms, V
B
= 0 V,
f = 1 kHz, R
AB
= 10 kW
V
A
= 5 V, V
B
= 0 V,
1
LSB error band
V
DD RANGE
I
DD
P
DISS
PSS
BW
THD
W
t
S
100/40
0.05
2
2.7
0.3
5.5
2
0.2
0.05
V
mA
mW
%/%
kHz
%
ms
V
DD
= 5 V
V
DD
= 5 V
V
DD
= 3 V
V
DD
= 3 V
V
IN
= 0 V or 5 V
V
IH
V
IL
V
IH
V
IL
I
IL
0.7 x V
DD
0.3V
DD
1
0.7 x V
DD
0.3V
DD
V
V
V
V
mA
f = 1 MHz, measured to GND,
Code = 0 x 80
f = 1 MHz, measured to GND,
Code = 0 x 80
V
A
= V
B
= V
DD
/2
V
A,B,W
C
A,B
C
W
I
CM
GND
45
60
1
V
DD
V
pF
pF
nA
Code = 0x80
Code = 0xFF
Code = 0x00
N
DNL
INL
nV
W
/nT
V
WFSE
V
WZSE
−3
0
−1
−1
0.1
0.4
100
−1
1
0
3
8
+1
+1
Bits
LSB
LSB
ppm/C
LSB
LSB
R−DNL
R−INL
nR
AB
nR
AB
/nT
R
W
−1
−2
−20
100
50
100
120
250
0.1
0.4
+1
+2
+20
LSB
LSB
%
ppm/C
W
Test Conditions
Symbol
Min
Typ
(Note 3)
Max
Unit
DYNAMIC CHARACTERISTICS
(Notes 8 and 10)
2. V
A
applies to both A1 and A2, V
B
applies to both B1 and B2.
3. Typical specifications represent average readings at +25C and V
DD
= 5 V.
4. Resistor position nonlinearity error R−INL is the deviation from an ideal value measured between the maximum resistance and the
minimum resistance wiper positions. R−DNL measures the relative step change from ideal between successive tap positions. Parts are
guaranteed monotonic.
5. CAT5271: V
AB
= V
DD
, Wiper (V
W
) = no connect. CAT5273: V
WB
= V
DD
.
6. INL and DNL are measured at VW with the digital potentiometer configured as a potentiometer divider similar to a voltage output D/A
converter. V
A
= V
DD
and V
B
= 0 V. DNL specification limits of
1
LSB maximum are guaranteed monotonic operating conditions.
7. Resistor terminals A, B, W have no limitations on polarity with respect to each other.
8. Guaranteed by design and not subject to production test.
9. Maximum terminal current is bounded by the maximum current handling of the switches, maximum power dissipation of the package, and
maximum applied voltage across any two of the A, B, and W terminals at a given resistance.
10. All dynamic characteristics use V
DD
= 5 V.
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CAT5271, CAT5273
Table 4. CAPACITANCE
Symbol
C
I/O
(Note 11)
T
A
= 25C, f = 1.0 MHz, V
DD
= 5 V
Test
Input/Output Capacitance (SDA, SCL)
Conditions
V
I/O
= 0 V
Max
8
Units
pF
Table 5. POWER UP TIMING
(Notes 11 and 12)
Symbol
t
PUR
t
PUW
Power-up to Read Operation
Power-up to Write Operation
Parameter
Max
1
1
Units
ms
ms
11. This parameter is tested initially and after a design or process change that affects the parameter.
12. t
PUR
and t
PUW
are delays required from the time V
CC
is stable until the specified operation can be initiated.
Table 6. DIGITAL POTENTIOMETER TIMING
Symbol
t
WRPO
t
WR
Parameter
Wiper Response Time After Power Supply Stable
Wiper Response Time: SCL falling edge after last bit of wiper position data byte to
wiper change
Min
Max
50
20
Units
ms
ms
Table 7. A.C. CHARACTERISTICS
Symbol
f
SCL
t
HIGH
t
LOW
t
SU:STA
t
HD:STA
t
SU:DAT
t
HD:DAT
t
SU:STO
t
BUF
t
R
t
F
t
DH
T
I
t
AA
Clock Frequency
Clock High Period
Clock Low Period
V
DD
= +2.7 V to +5.5 V,
−40C
to +85C unless otherwise specified.
Parameter
Min
Typ
Max
400
600
1300
600
600
100
0
600
1300
300
300
100
50
1
Units
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
Start Condition Setup Time (for a Repeated Start Condition)
Start Condition Hold Time
Data in Setup Time
Data in Hold Time
Stop Condition Setup Time
Time the bus must be free before a new transmission can start
SDA and SCL Rise Time
SDA and SCL Fall Time
Data Out Hold Time
Noise Suppression Time Constant at SCL, SDA Inputs
SCL Low to SDA Data Out and ACK Out
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CAT5271, CAT5273
TYPICAL CHARACTERISTICS
0.03
0.02
0.01
0
ERROR (LSB)
ERROR (LSB)
−0.1
−0.2
−0.3
−0.4
−0.5
INL
DNL
0.1
0
−0.01
−0.02
−0.03
−0.04
−0.05
0
32
64
96
128
TAP
160
192
224
256
0
32
64
96
128
TAP
160
192
224 256
Figure 3. Potentiometer Divider Differential
Non-linearity, V
DD
= 5.6 V
0.10
0.08
0.06
0.04
0.02
0
−0.02
−0.04
0
32
64
96
128
TAP
160
192
224
256
0.16
0.14
0.12
ERROR (LSB)
0.10
0.08
0.06
0.04
0.02
0
−0.02
−0.04
Figure 4. Potentiometer Divider Integral
Non-linearity, V
DD
= 5.6 V
ERROR (LSB)
0
32
64
96
128
TAP
160
192
224 256
Figure 5. Rheostat Differential Non-linearity,
V
DD
= 5.6 V
120
100
V
DD
= 2.6 V
80
Rw (W)
60
3.3 V
40
20
0
4.0 V
0
50
100
TAP
5.6 V
Vw (V)
4
3
2
1
0
6
Figure 6. Rheostat Integral Non-linearity,
V
DD
= 5.6 V
5.6 V
5
5.0 V
4.0 V
3.3 V
V
DD
= 2.6 V
150
200
250
0
52
104
TAP
156
208
260
Figure 7. Wiper Resistance at Room
Temperature
Figure 8. Wiper Voltage
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