CAT5120, CAT5121, CAT5122
16-Tap MiniPot™ Digitally Programmable Potentiometers
with 2-Wire Interface
FEATURES
s
0.3
µ
A Ultra-low supply current
s
Single-supply operation: 2.7 V to 5.5 V
s
Glitchless switching between resistor taps
s
Power-on reset to midscale
H
GEN
FR
ALO
EE
LE
A
D
F
R
E
E
TM
s
2-Wire up/down serial interface
s
Resistance values: 10kΩ, 50kΩ and 100kΩ
Ω,
Ω
Ω
s
Available in SC70 and SOT-23 packages
APPLICATIONS
s
LCD screen adjustment
s
Volume control
s
Mechanical potentiometer replacement
s
Gain adjustment
s
Line impedance matching
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.
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.
PIN CONFIGURE
FUNCTIONAL DIAGRAM
H
V
DD
1
6 H
V
DD
1
5 H
V
DD
GND
GND 2
5 W
GND 2
CAT5120
U/D 3
4 CS
U/D 3
CAT5122
4 CS
CS
UP/DN
Counter
16-Position
Decoder
W
U/D
V
DD
1
6 H
L
GND 2
5 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
CAT5120
1
2
3
CAT5121
1
2
3
CAT5122
1
2
3
V
DD
GND
U/
D
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
Pin Function
4
-
5
6
4
5
-
6
4
-
-
5
CS
L
W
H
Doc. No. 2121, Rev. A
2
CAT5120/5121/5122
ORDERING INFORMATION
Ordering Part Number
CAT5120SBI-10-T
CAT5120SBI-10-T10
CAT5120TPI-10-T
CAT5120TPI-10-T10
CAT5120SBI-50-T
CAT5120SBI-50-T10
CAT5120TPI-50-T
CAT5120TPI-50-T10
CAT5120SBI-00-T
CAT5120SBI-00-T10
CAT5120TPI-00-T
CAT5120TPI-00-T10
CAT5121SBI-10-T
CAT5121SBI-10-T10
CAT5121TPI-10-T
CAT5121TPI-10-T10
CAT5121SBI-50-T
CAT5121SBI-50-T10
CAT5121TPI-50-T
CAT5121TPI-50-T10
CAT5121SBI-00-T
CAT5121SBI-00-T10
CAT5121TPI-00-T
CAT5121TPI-00-T10
CAT5122SBI-10-T
CAT5122SBI-10-T10
CAT5122TPI-10-T
CAT5122TPI-10-T10
CAT5122SBI-50-T
CAT5122SBI-50-T10
CAT5122TPI-50-T
CAT5122TPI-50-T10
CAT5122SBI-00-T
CAT5122SBI-00-T10
CAT5122TPI-00-T
CAT5122TPI-00-T10
Resistor K
10
10
10
10
50
50
50
50
100
100
100
100
10
10
10
10
50
50
50
50
100
100
100
100
10
10
10
10
50
50
50
50
100
100
100
100
Top Mark
JE_
JE_
JEYM
JEYM
JF_
JF_
JFYM
JFYM
JGYM
JG_
JGYM
JGYM
JH_
JH_
JHYM
JHYM
JJ_
JJ_
JJYM
JJYM
JK_
JK_
JKYM
JKYM
JB_
JB_
JBYM
JBYM
JC_
JC_
JCYM
JCYM
JD_
JD_
JDYM
JDYM
Pin Package
6 Lead SC70
6 Lead SC70
6 Lead SOT-23
6 Lead SOT-23
6 Lead SC70
6 Lead SC70
6 Lead SOT-23
6 Lead SOT-23
6 Lead SC70
6 Lead SC70
6 Lead SOT-23
6 Lead SOT-23
6 Lead SC70
6 Lead SC70
6 Lead SOT-23
6 Lead SOT-23
6 Lead SC70
6 Lead SC70
6 Lead SOT-23
6 Lead SOT-23
6 Lead SC70
6 Lead SC70
6 Lead SOT-23
6 Lead SOT-23
5 Lead SC70
5 Lead SC70
5 Lead SOT-23
5 Lead SOT-23
5 Lead SC70
5 Lead SC70
5 Lead SOT-23
5 Lead SOT-23
5 Lead SC70
5 Lead SC70
5 Lead SOT-23
5 Lead SOT-23
Parts Per Reel
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10 k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3
Doc. No. 2121, Rev. A
CAT5120/5121/5122
ORDERING INFORMATION (CON’T)
Ordering Part Number
CAT5120SDI-10-T
CAT5120SDI-10-T10
CAT5120TBI-10-T
CAT5120TBI-10-T10
CAT5120SDI-50-T
CAT5120SDI-50-T10
CAT5120TBI-50-T
CAT5120TBI-50-T10
CAT5120SDI-00-T
CAT5120SDI-00-T10
CAT5120TBI-00-T
CAT5120TBI-00-T10
CAT5121SDI-10-T
CAT5121SDI-10-T10
CAT5121TBI-10-T
CAT5121TBI-10-T10
CAT5121SDI-50-T
CAT5121SDI-50-T10
CAT5121TBI-50-T
CAT5121TBI-50-T10
CAT5121SDI-00-T
CAT5121SDI-00-T10
CAT5121TBI-00-T
CAT5121TBI-00-T10
CAT5122SDI-10-T
CAT5122SDI-10-T10
CAT5122TBI-10-T
CAT5122TBI-10-T10
CAT5122SDI-50-T
CAT5122SDI-50-T10
CAT5122TBI-50-T
CAT5122TBI-50-T10
CAT5122SDI-00-T
CAT5122SDI-00-T10
CAT5122TBI-00-T
CAT5122TBI-00-T10
Resistor K
10
10
10
10
50
50
50
50
100
100
100
100
10
10
10
10
50
50
50
50
100
100
100
100
10
10
10
10
50
50
50
50
100
100
100
100
Top Mark
KC_
KC_
KCYM
KCYM
KD_
KD_
KDYM
KDYM
KE_
KE_
KEYM
KEYM
KF_
KF_
KFYM
KFYM
KG_
KG_
KGYM
KGYM
KH_
KH_
KHYM
KHYM
KY_
KY_
KYYM
KYYM
KA_
KA_
KAYM
KAYM
KB_
KB_
KBYM
KBYM
Pin Package
6 Lead SC70 green
6 Lead SC70 green
6 Lead SOT-23 green
6 Lead SOT-23 green
6 Lead SC70 green
6 Lead SC70 green
6 Lead SOT-23 green
6 Lead SOT-23 green
6 Lead SC70 green
6 Lead SC70 green
6 Lead SOT-23 green
6 Lead SOT-23 green
6 Lead SC70 green
6 Lead SC70 green
6 Lead SOT-23 green
6 Lead SOT-23 green
6 Lead SC70 green
6 Lead SC70 green
6 Lead SOT-23 green
6 Lead SOT-23 green
6 Lead SC70 green
6 Lead SC70 green
6 Lead SOT-23 green
6 Lead SOT-23 green
5 Lead SC70 green
5 Lead SC70 green
5 Lead SOT-23 green
5 Lead SOT-23 green
5 Lead SC70 green
5 Lead SC70 green
5 Lead SOT-23 green
5 Lead SOT-23 green
5 Lead SC70 green
5 Lead SC70 green
5 Lead SOT-23 green
5 Lead SOT-23 green
Parts Per Reel
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
3k
10k
Doc. No. 2121, Rev. A
4
CAT5120/5121/5122
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND........................................... -0.3 V to +6 V
All Other Pins to GND .............. -0.3 V to (V
DD
+ 0.3) V
Input and Output Latch-Up Immunity ............ +200 mA
Maximum Continuous Current into H, L and W
100kΩ
...................................................................
+0.6 mA
50kΩ
......................................................................
+1.3 mA
10kΩ
......................................................................
+1.3 mA
Continuous Power Dissipation (T
A
= +70˚C)
5-pin SC70* .................................................... 247 mW
6-pin SC70* .................................................... 245 mW
Operating Temperature Range ........... -40°C to +85˚C
Junction Temperature ......................................+150˚C
Storage Temperature Range ............ -65˚C to +150˚C
Soldering Temperature (soldering, 10s) .......... +300˚C
*(derate 3.1mW/˚C above T
A
= +70˚C)
COMMENT
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.
ELECTRICAL CHARACTERISTICS
(V
DD
= 2.7 V to 5.5 V, V
H
= V
DD
, V
L
= 0, T
A
= -40˚C to 85˚C. Typical values are at V
DD
= 2.7 V, T
A
= 25˚C, unless
otherwise noted).
Symbol
DC Performance
Resolution
CAT5120
End-to-End Resistance
CAT5121
CAT5122
TC
R
INL
DNL
End-to-End Resistance Tempco
Ratiometric Resistance Tempco
Integral Nonlinearity
Differential Nonlinearity
Zero/Full-Scale Error
R
W
Wiper Resistance
+0.1
200
16
80
40
8
100
50
10
200
5
+0.5
+0.5
+0.5
600
120
60
12
ppm/˚ C
ppm/˚ C
LSB
LSB
LSB
Ω
kΩ
Taps
Parameter
Conditions
Min
Typ
Max
Units
Digital Inputs
V
IH
V
IL
Input High Voltage
Input Low Voltage
0.7 x V
DD
0.3 x V
DD
V
V
Timing Characteristics (Figures 1, 2)
t
CU
t
CI
t
IC
t
IL
t
IH
f
TOGGLE
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
(1)
25
50
25
25
25
1
100k
Ω
variable resistor configuration,
CL = 10pF
100k
Ω
potentiometer configuration,
CL = 10pF
1
0.25
ns
ns
ns
ns
ns
MHz
t
SETTLE
Output Settling Time
(2)
µs
5
Doc. No. 2121, Rev. A
