Dual Digital
Potentiometer (POT)
with 256 Taps
and SPI Interface
CAT5261
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Description
The CAT5261 is two digital POTs integrated with control logic and
8 bytes of NVRAM memory. Each digital POT consists of a series of
resistive elements connected between two externally accessible end
points. The tap points between each resistive element are connected to
the wiper outputs with CMOS switches. A separate 8-bit control
TSSOP24
register (WCR) independently controls the wiper tap switches for each
Y SUFFIX
digital POT. Associated with each wiper control register are four 8-bit
CASE 948AR
non-volatile memory data registers (DR) used for storing up to four
wiper settings. Writing to the wiper control register or any of the
non-volatile data registers is via a SPI serial bus. On power-up, the
contents of the first data register (DR0) for each of the potentiometers
is automatically loaded into its respective wiper control register.
SOIC24
The CAT5261 can be used as a potentiometer or as a two terminal,
W SUFFIX
variable resistor. It is intended for circuit level or system level
CASE 751BK
adjustments in a wide variety of applications. It is available in the
40C to 85C industrial operating temperature range and offered in a
24-lead SOIC and TSSOP package.
PIN CONNECTIONS
Features SO 1 HOLD
A0 SCK
Two Linear-taper Digital Potentiometers
NC NC
256 Resistor Taps per Potentiometer
NC NC
End to End Resistance 50 k or 100 k
NC
NC
Potentiometer Control and Memory Access via SPI Interface
NC
NC
CAT5261
Low Wiper Resistance, Typically 100
GND
V
CC
Nonvolatile Memory Storage for up to Four Wiper Settings for Each
R R
W1
L0
Potentiometer
R R
H0 H1
R R
Automatic Recall of Saved Wiper Settings at Power Up
W0 L1
CS A1
2.5 to 6.0 Volt Operation
SI
WP
Standby Current less than 1 A
SOIC24 (W)
1,000,000 Nonvolatile WRITE Cycles
TSSOP24 (Y)
100 Year Nonvolatile Memory Data Retention
(Top View)
24-lead SOIC and 24-lead TSSOP
Industrial Temperature Range
ORDERING INFORMATION
These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
See detailed ordering and shipping information in the package
Compliant
dimensions section on page 12 of this data sheet.
Semiconductor Components Industries, LLC, 2013
1 Publication Order Number:
December, 2019 Rev. 9 CAT5261/DCAT5261
MARKING DIAGRAMS
(SOIC24) (TSSOP24)
L3B
RLB
CAT5261WT
CAT5261YI
RRYMXXXX
3YMXXX
L = Assembly Location R = Resistance
3 = Lead Finish Matte-Tin 1 = 2.5 K
B = Product Revision (Fixed as B) 2 = 10 K
CAT = Fixed as CAT 4 = 50 K
5261W = Device Code 5 = 100 K
T = Temperature Range (I = Industrial) L = Assembly Location
= Dash B = Product Revision (Fixed as B)
RR = Resistance CAT5261Y = Device Code
25 = 2.5 K I = Temperature Range (I = Industrial)
10 = 10 K 3 = Lead Finish Matte-Tin
50 = 50 K Y = Production Year (Last Digit)
00 = 100 K M = Production Month (19, O, N, D)
Y = Production Year (Last Digit) XXX = Last Three Digits of Assembly Lot Number
M = Production Month (1-9, O, N, D)
XXXX = Last Four Digits of Assembly Lot Number
R R
H0 H1
CS
WIPER
SPI BUS
SCK
CONTROL
SI INTERFACE R
W0
REGISTERS
SO
R
W1
WP
NONVOLATILE
A0 CONTROL
DATA
A1
LOGIC
REGISTERS
HOLD
R R
L0 L1
Figure 1. Functional Diagram
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