DATASHEET
X9C303
Logarithmic Digitally Controlled Potentiometer (XDCP™) Terminal Voltage ±5V,
100 Taps, Log Taper
FN8223
Rev 2.00
January 30, 2009
Description
The Intersil X9C303 is a digitally controlled potentiometer
(XDCP). The device consists of a resistor array, wiper
switches, a control section, and nonvolatile memory. The
wiper position is controlled by a three-wire interface.
The resistor array is composed of 99 resistive elements.
Between each element and at either end are tap points
accessible to the wiper terminal. The position of the wiper
element is controlled by the CS, U/D, and INC inputs. The
position of the wiper can be stored in nonvolatile memory
and then be recalled upon a subsequent power-up
operation.
The device can be used as a three-terminal potentiometer or
as a two-terminal variable resistor in a wide variety of
applications ranging from control, to signal processing, to
parameter adjustment. Digitally-controlled potentiometers
provide three powerful application advantages; (1) the
variability and reliability of a solid-state potentiometer, (2) the
flexibility of computer-based digital controls, and (3) the use
of nonvolatile memory for potentiometer settings retention.
Features
• Solid-state potentiometer
• Three-wire serial interface
• 100 wiper tap points
- Wiper position stored in nonvolatile memory and
recalled on power-up
• 99 resistive elements, log taper
- Temperature compensated
- End-to-end resistance, 32k ±15%
- Terminal voltages, ±5V
• Low power CMOS
- V
CC
= 5V
- Active current, 3mA max.
- Standby current, 750µA max.
• High reliability
- Endurance, 100,000 data changes per bit
- Register data retention, 100 years
• Packages
- 8 Ld TSSOP
- 8 Ld SOIC
- 8 Ld PDIP
• Pb-free available (RoHS compliant)
Block Diagram
U/D
INC
CS
7-BIT
UP/DOWN
COUNTER
99
98
97
96
ONE
OF
ONE-
HUNDRED
DECODER
2
STORE AND
RECALL
CONTROL
CIRCUITRY
R
H/
V
H
7-BIT
NONVOLATILE
MEMORY
TRANSFER
GATES
RESISTOR
ARRAY
1
0
R
L/
V
L
R
W/
V
W
V
CC
V
SS
FN8223 Rev 2.00
January 30, 2009
Page 1 of 10
X9C303
Ordering Information
PART
NUMBER
X9C303P
X9C303PI
X9C303PIZ (Notes 1, 2)
X9C303PZ (Notes 1, 2)
X9C303S8*
,
**
X9C303S8I*
X9C303S8IZ* (Note 1)
X9C303S8Z* (Note 1)
X9C303V8*
,
**
X9C303V8I*
X9C303V8IZ* (Note 1)
X9C303V8Z* (Note 1)
X9C303S8I-2.7
PART
MARKING
X9C303P
X9C303P I
X9C303P ZI
X9C303P Z
X9C303S
X9C303S I
X9C303S ZI
X9C303S Z
9C303
C303 I
C303 IZ
9C303 Z
X9C303S G
TEMP. RANGE
(°C)
0 to +70
-40 to +85
-40 to +85
0 to +70
0 to +70
-40 to +85
-40 to +85
0 to +70
0 to +70
-40 to +85
-40 to +85
0 to +70
-40 to +85
-40 to +85
8 Ld PDIP
8 Ld PDIP
8 Ld PDIP (300 mil) (Pb-free)
8 Ld PDIP (300 mil) (Pb-free)
8 Ld SOIC (150 mil)
8 Ld SOIC (150 mil)
8 Ld SOIC (150 mil) (Pb-free)
8 Ld SOIC (150 mil) (Pb-free)
8 Ld TSSOP (4.4mm)
8 Ld TSSOP (4.4mm)
8 Ld TSSOP (4.4mm) (Pb-free)
8 Ld TSSOP (4.4mm) (Pb-free)
8 Ld SOIC (150 mil)
8 Ld SOIC (150 mil) (Pb-free)
PACKAGE
PKG.
DWG. #
MDP0031
MDP0031
MDP0031
MDP0031
MDP0027
MDP0027
MDP0027
MDP0027
M8.173
M8.173
M8.173
M8.173
MDP0027
MDP0027
X9C303S8IZ-2.7 (Note 1) X9C303S ZG
*Add “T1” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
**Add “T2” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
NOTES:
1. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100%
matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations).
Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC
J STD-020.
2. Pb-free PDIPs can be used for through hole wave solder processing only. They are not intended for use in Reflow solder processing applications.
Pin Descriptions
V
H
and V
L
The high (V
H
) and low (V
L
) terminals of the device are
equivalent to the fixed terminals of a mechanical
potentiometer. The minimum voltage is –5V and the maximum
is +5V. It should be noted that the terminology of V
L
and V
H
references the relative position of the terminal in relation to
wiper movement direction selected by the U/D input and not
the voltage potential on the terminal.
returned HIGH while the INC input is also HIGH. After the store
operation is complete, the device will be placed in the low power
standby mode until the device is selected once again.
Pinouts
X9C303
(8 LD SOIC, 8 LD PDIP)
TOP VIEW
INC
U/D
V
H
V
SS
1
2
3
4
X9C303
8
7
6
5
V
CC
CS
V
L
V
W
V
W
V
W
is the wiper terminal, equivalent to the movable terminal of
a mechanical potentiometer. The position of the wiper within
the array is determined by the control inputs. The wiper
terminal series resistance is typically 40.
Up/Down (U/D)
The U/D input controls the direction of the wiper movement
and whether the counter is incremented or decremented.
X9C303
(8 LD TSSOP)
TOP VIEW
CS
V
CC
INC
U/D
1
2
3
4
X9C303
8
7
6
5
V
L
V
W
V
SS
V
H
Increment (INC)
The INC input is negative-edge triggered. Toggling INC will move
the wiper and either increment or decrement the counter in the
direction indicated by the logic level on the U/D input.
Chip Select (CS)
The device is selected when the CS input is LOW. The current
counter value is stored in nonvolatile memory when CS is
FN8223 Rev 2.00
January 30, 2009
Page 2 of 10
X9C303
Pin Names
SYMBOL
VH
VW
VL
VSS
VCC
U/D
INC
CS
NC
DESCRIPTION
High Terminal (Potentiometer)
Wiper Terminal (Potentiometer)
Low Terminal (Potentiometer)
Ground
Supply Voltage
Up/Down Control Input
Increment Control Input
Chip Select Control Input
No Connection
The electronic switches on the device operate in a “make
before break” mode when the wiper changes tap positions. If
the wiper is moved several positions, multiple taps are
connected to the wiper for t
IW
(INC to V
W
change). The R
TOTAL
value for the device can temporarily be reduced by a significant
amount if the wiper is moved several positions.
When the device is powered-down, the last counter position
stored will be maintained in the nonvolatile memory. When
power is restored, the contents of the memory are recalled and
the counter is reset to the value last stored.
Instructions and Programming
The INC, U/D and CS inputs control the movement of the wiper
along the resistor array. With CS set LOW, the device is selected
and enabled to respond to the U/D and INC inputs. HIGH to
LOW transitions on INC will increment or decrement (depending
on the state of the U/D input) a seven-bit counter. The output of
this counter is decoded to select one of one-hundred wiper
positions along the resistive array.
The value of the counter is stored in nonvolatile memory
whenever CS transitions HIGH while the INC input is also
HIGH.
The system may select the X9C303, move the wiper, and
deselect the device without having to store the latest wiper
position in nonvolatile memory. The wiper movement is
performed as previously described ; once the new position is
reached, the system would the keep INC LOW while taking CS
HIGH. The new wiper position would be maintained until
changed by the system or until a power-down/up cycle recalled
the previously stored data.
This would allow the system to always power-up to a preset
value stored in nonvolatile memory; then during system
operation minor adjustments could be made. The adjustments
might be based on user preference: system parameter
changes due to temperature drift, etc.
The state of U/D may be changed while CS remains LOW. This
allows the host system to enable the device and then move the
wiper up and down until the proper trim is attained.
Potentiometer Relationships
S100
V
H
(V
S
)
R99
R98
S99
S98
V
W
S3
R2
S2
S1
R1
V
L
R +R +...+R
V
1
2
i
W
G i = 20Log ------------------------------------------------- = ---------
V L = 0V
V
R
S
TOTAL
R +R +...+R
= R
1
2
99
TOTAL
(REFER TEST CIRCUIT 1)
Principles of Operation
There are three sections of the X9C303: the input control,
counter and decode section; the nonvolatile memory; and the
resistor array. The input control section operates just like an
up/down counter. The output of this counter is decoded to turn
on a single electronic switch connecting a point on the resistor
array to the wiper output. Under the proper conditions, the
contents of the counter can be stored in nonvolatile memory and
retained for future use. The resistor array is comprised of 99
individual resistors connected in series. At either end of the
array and between each resistor is an electronic switch that
transfers the potential at that point to the wiper.
The wiper, when at either fixed terminal, acts like its
mechanical equivalent and does not move beyond the last
position. That is, the counter does not wrap around when
clocked to either extreme.
Mode Selection
CS
L
L
H
H
X
L
L
L
INC
U/D
H
L
X
X
X
H
L
Wiper Up
Wiper Down
Store Wiper Position
Standby Current
No Store, Return to Standby
Wiper Up (not recommended)
Wiper Down (not recommended)
MODE
FN8223 Rev 2.00
January 30, 2009
Page 3 of 10
X9C303
Symbol Table
WAVEFORM
INPUTS
Must be
steady
May change
from Low to
High
May change
from High to
Low
Don’t Care:
Changes
Allowed
N/A
OUTPUTS
Will be
steady
Will change
from Low to
High
Will change
from High to
Low
Changing:
State Not
Known
Center Line
is High
Impedance
Typical Electrical Taper
100
90
80
% TOTAL RESISTANCE
70
60
50
40
30
20
10
0
0
3
6
9
12
15
18
21
24
27
30
33
36
39
42
45
48
51
54
57
60
63
66
69
72
75
78
81
84
87
90
93
96
C
L
10pF
TAP
99
R
L
R(V
H
- V
W
)
R(V
W
- V
L
)
Test Circuit #1
V
H
Test Circuit #2
V
H
TEST POINT
Circuit #3 SPICE Macro Model
R
TOTAL
R
H
C
H
C
W
V
S
V
W
V
L
TEST POINT
V
W
V
L
FORCE
CURRENT
10pF
25pF
R
W
FN8223 Rev 2.00
January 30, 2009
Page 4 of 10
X9C303
Absolute Maximum Ratings
Temperature Under Bias . . . . . . . . . . . . . . . . . . . . .-65°C to +135°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Voltage on CS, INC, U/D and V
CC
with Respect to V
SS
. -1V to +7V
Voltage on V
H
and V
L
Referenced to V
SS
. . . . . . . . . . . . -8V to +8V
V
= |V
H
- V
L
| X9C303 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10V
Wiper Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1mA
Thermal Information
Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
*Pb-free PDIPs can be used for through hole wave solder
processing only. They are not intended for use in Reflow solder
processing applications.
Recommended Operating Conditions
Commercial Temperature Range. . . . . . . . . . . . . . . . . 0°C to +70°C
Industrial Temperature Range . . . . . . . . . . . . . . . . . .-40°C to +85°C
Military Temperature Range. . . . . . . . . . . . . . . . . . .-55°C to +125°C
Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V ±10%
Power Rating at +25°C X9C303 . . . . . . . . . . . . . . . . . . . . . . .10mW
Physical Characteristics
Marking Includes
Manufacturer’s Trademark
Resistance Value or Code
Date Code
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
Analog Specifications
Over recommended operating conditions, unless otherwise specified. Parameters with MIN and/or MAX
limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
characterization and are not production tested.
LIMITS
SYMBOL
R
TOTAL
PARAMETER
End-to-End Resistance
End-to-End Resistance Tolerance
TEST CONDITIONS
MIN
TYP
(Note 3)
32
MAX
UNIT
-15
-5
-5
Max Wiper Current ±1mA
Error = log (Vw(n)) - log (Vw(n - 1))
for tap n = 2 - 99, V
H
-V
L
= 10V
At 1kHz
At 850kHz
T = -40°C to +85°C
Tap position 84
See “Circuit #3 SPICE Macro Model” on
page 4
0.005
23
20
±400
±20
10/10/25
40
+15
+5
+5
100
0.115
%
V
V
dB
nV(RMS)/
Hz
mV(RMS)
ppm/°C
ppm/°C
pF
VH
VL
RW
V
H
Terminal Voltage
V
L
Terminal Voltage
Wiper Resistance
Tap Position Relative Step Size Error
Resistor Noise
Charge Pump Noise
End-to-End Resistance
Temperature Coefficient
Ratiometric Temperature Coefficient
C
H
/C
L
/C
W
(Note 5)
Potentiometer Capacitance
FN8223 Rev 2.00
January 30, 2009
Page 5 of 10
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