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© Semiconductor Components Industries, LLC, 2012
January, 2012 − Rev. 8
1 Publication Order Number:
CAT5251/D
CAT5251
Quad Digitally Program-
mable Potentiometer (DPP)
with 256 Taps and SPI
Interface
Description
The CAT5251 is four Digitally Programmable Potentiometers
(DPPs) integrated with control logic and 16 bytes of NVRAM
memory. Each DPP 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 register (WCR) independently
controls the wiper tap switches for each DPP. Associated with each
wiper control register are four 8−bit 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 four potentiometers is automatically loaded into
its respective wiper control register.
The CAT5251 can be used as a potentiometer or as a two terminal,
variable resistor. It is intended for circuit level or system level
adjustments in a wide variety of applications. It is available in the
−40°C to 85°C industrial operating temperature range and offered in a
24−lead SOIC and TSSOP package.
Features
• Four Linear−taper Digitally Programmable Potentiometers
• 254 Resistor Taps per Potentiometer
• End to End Resistance 50 kW or 100 kW
• Potentiometer Control and Memory Access via SPI Interface
• Low Wiper Resistance, Typically 100 W
• Nonvolatile Memory Storage for up to Four Wiper Settings for Each
Potentiometer
• Automatic Recall of Saved Wiper Settings at Power Up
• 2.5 to 6.0 Volt Operation
• Standby Current less than 1 mA
• 1,000,000 Nonvolatile WRITE Cycles
• 100 Year Nonvolatile Memory Data Retention
• SOIC 24−lead and TSSOP 24−lead
• Industrial Temperature Range
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
http://onsemi.com
TSSOP−24
Y SUFFIX
CASE 948AR
PIN CONNECTIONS
SOIC−24 (W)
TSSOP−24 (Y)
(Top View)
HOLD
SO
A0
R
W3
1
R
H3
R
L3
SCK
R
L2
R
H2
R
W2
SOIC−24
W SUFFIX
CASE 751BK
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
ORDERING INFORMATION
NC
GND
R
W1
R
H1
R
L1
NC
V
CC
R
L0
R
H0
R
W0
CAT5251
A1
SI
CS
WP
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