REV 1.1 11/10/00
Characteristics subject to change without notice.
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BLOCK DIAGRAM
5-Bit
Up/Down
Counter
5-Bit
Nonvolatile
Memory
Store and
Recall
Control
Circuitry
One
of
Thirty-Two
Decoder
Resistor
Array
31
30
29
28
2
1
0
V
L
/R
L
V
W
/R
W
V
H
/R
H
U/D
INC
CS
V
CC
V
SS
Transfer
Gates
X9314
Single Digitally Controlled Potentiometer (XDCP
TM
)
FEATURES
Solid State Potentiometer
32 Taps
10K
End to End Resistance
Three-Wire Up/Down Serial Interface
Wiper Resistance, 40
Typical
Nonvolatile Storage and Recall on Power Up of
Wiper Position Standby Current < 500A Max
(Total Package)
V
CC
= 3V to 5.5V Operation
100 Year Data Retention
Offered in MSOP, SOIC Packages
DESCRIPTION
The Xicor X9314 is a solid state nonvolatile
potentiometer and is ideal for digitally controlled
resistance trimming.
The X9314 is a resistor array composed of 31 resistive
elements. Between each element and at either end are
tap points accessible to the wiper element. 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 XDCP can be used as a three-terminal
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
Terminal Voltages 5V, 32 Taps, Log Taper
A
PPLICATION
N
OTE
A V A I L A B L E
AN42 AN4450 AN52 AN53 AN71 AN73 AN99 AN115 AN120 AN124 AN134
XDCP is a trademark of Xicor, Inc.
X9314
REV 1.1 11/10/00
Characteristics subject to change without notice.
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PIN DESCRIPTIONS
V
H
/R
H
and V
L
/R
L
The high (V
H
/R
H
) and low (V
L
/R
L
) terminals of the
X9314 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
/R
L
and V
H
/R
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.
V
W
/R
W
V
W
/R
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.
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 returned HIGH while the INC input is also
HIGH. After the store operation is complete the X9314
will be placed in the low power standby mode until the
device is selected once again.
PIN CONFIGURATION
PIN NAMES
Symbol
Description
V
H
/R
H
High Terminal
V
W
/R
W
Wiper Terminal
V
L
/R
L
Low Terminal
V
SS
Ground
V
CC
Supply Voltage
U/D
Up/Down Input
INC
Increment Input
CS
Chip Select Input
U/D
INC
V
CC
CS
V
H
/R
H
V
SS
V
W
/R
W
V
L
/R
L
1
2
3
4
8
7
6
5
X9314
8-Lead MSOP
V
CC
CS
V
L
/R
L
V
W
/R
W
INC
U/D
V
H
/R
H
V
SS
1
2
3
4
8
7
6
5
X9314
8-Lead DIP/SOIC
Typical Attenuation Characteristics (dB)
Tap Position
0
4
8
12
16
20
24
28
31
-20
-40
-43.5
0
-60
Attenuation (dB)
X9314
REV 1.1 11/10/00
Characteristics subject to change without notice.
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PRINCIPLES OF OPERATION
There are three sections of the X9314: 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 31 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 INC, U/D and CS inputs control the movement of
the wiper along the resistor array. With CS set LOW the
X9314 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 five bit counter. The output of this
counter is decoded to select one of thirty-two wiper
positions along the resistive array.
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.
The value of the counter is stored in nonvolatile
memory whenever CS transistions HIGH while the INC
input is also HIGH.
When the X9314 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.
Operation Notes
The system may select the X9314, move the wiper and
deselect the device without having to store the latest
wiper position in nonvolatile memory. The wiper
movement is performed as described above; once the
new position is reached, the system would keep the
INC LOW while taking CS HIGH. The new wiper
position would be maintained until changed by the
system or until a power-up/down 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 X9314
and then move the wiper up and down until the proper
trim is attained.
t
IW
/R
TOTAL
The electronic switches on the X9314 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.
SYMBOL TABLE
WAVEFORM
INPUTS
OUTPUTS
Must be
steady
Will be
steady
May change
from Low to
High
Will change
from Low to
High
May change
from High to
Low
Will change
from High to
Low
Don't Care:
Changes
Allowed
Changing:
State Not
Known
N/A
Center Line
is High
Impedance
X9314
REV 1.1 11/10/00
Characteristics subject to change without notice.
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ABSOLUTE MAXIMUM RATINGS
Temperature under bias ....................65
C to +135
C
Storage temperature .........................65C to +150C
Voltage on CS, INC, U/D, and
V
CC
with respect to V
SS
......................... 1V to +7V
Voltage on V
H
/R
H
and V
L
/R
L
referenced
to V
SS
.......................................................-8V to +8V
V = |V
H
/R
H
V
L
/R
L
|.............................................. 10V
Lead temperature (soldering 10 seconds)..........300C
Wiper current ..................................................... 1mA
I
W
(10 seconds) .............................................. 8.8mA
COMMENT
Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device.
This is a stress rating only; functional operation of the
device (at these or any other conditions above those
listed in the operational sections of this specification) is
not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device
reliability.
POTENTIOMETER CHARACTERISTICS
(Over recommended operating conditions unless otherwise stated.)
Notes:
(1) This parameter is periodically sampled and not 100% tested.
POWER UP AND DOWN REQUIREMENT
The are no restrictions on the sequencing of V
CC
and the voltages applied to the potentiometer pins during power-
up or power-down conditions. During power-up, the data sheet parameters for the DCP do not fully apply until 1
millisecond after V
CC
reaches its final value. The V
CC
ramp rate spec is always in effect.
Symbol
Parameter
Limits
Test Conditions/
Notes
Min.
Typ.
Max.
Units
R
TOTAL
End to End Resistance Tolerance
20
%
V
H
/R
H
Terminal Voltage
-5
+5
V
V
VL/RL
V
L
/R
L
Terminal Voltage
-5
+5
V
Power Rating
10
mW
at 25C
R
W
Wiper Resistance
40
100
I
W
= 1mA, V
CC
= 5V
I
W
Wiper Current
4.4
mA
Noise
-120
dBV
Ref: 1kHz
Relative variation. Error in step
size between taps.
0.07-
0.003
0.07 +
0.003
log (R
w(n)
)log R
w(n-1)
)
R
TOTAL
Temperature Coefficient
600
ppm/C
for -40C to +85C
Ratiometric Temperature
Coefficient
20
ppm/C
C
H
/C
L
/C
W
Potentiometer Capacitance
10/10/25
pF
See Circuit #3
RECOMMENDED OPERATING CONDITIONS
Temperature
Min.
Max.
Commercial
0C
+70C
Industrial
40C
+85C
Supply Voltage (V
CC
)
Limits
X9314
5V 10%
X9314-3
3V to 5.5V
X9314
REV 1.1 11/10/00
Characteristics subject to change without notice.
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D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)
STANDARD PARTS
Notes: (4) Typical values are for T
A
= 25C and nominal supply voltage.
(5) This parameter is periodically sampled and not 100% tested.
Symbol
Parameter
Limits
Units
Test Conditions
Min.
Typ.
(4)
Max.
I
CC
V
CC
Active Current
1
3
mA
CS = V
IL
,
U/D
= V
IL
or V
IH
and
INC = 0.4V/2.4V @ max. t
CYC
I
SB
Standby Supply Current
500
A
CS = V
CC
0.3V,
U/D
and
INC = V
SS
or V
CC
0.3V
I
LI
CS, INC,
U/D
Input Leakage
Current
10
A
V
IN
= V
SS
to V
CC
V
IH
CS, INC,
U/D
Input HIGH Voltage
2
V
CC
+ 1
V
V
IL
CS, INC,
U/D
Input LOW Voltage
1
0.8
V
C
IN
(5)
CS, INC,
U/D
Input Capacitance
10
pF
V
CC
= 5V, V
IN
= V
SS
, T
A
= 25C,
f = 1MHz
Part Number
Maximum Resistance
Wiper Increments
Minimum Resistance
X9314W
10K
Log Taper
40
Test Circuit #1
Test Circuit #2
Circuit #3 SPICE Macromodel
Test Point
V
W
/R
W
V
H
/R
H
V
L
/R
L
Force
Current
V
W
/R
W
V
H
/R
H
V
L
/R
L
Test Point
10pF
R
H
R
TOTAL
C
H
25pF
C
W
C
L
10pF
R
W
R
L
Macro Model
A.C. CONDITIONS OF TEST
MODE SELECTION
Input Pulse Levels
0V to 3V
Input rise and fall times
10ns
Input reference levels
1.5V
CS
INC
U/D
Mode
L
H
Wiper up
L
L
Wiper down
H
X
Store wiper position
H
X
X
Standby
L
X
No store, return to standby
X9314
REV 1.1 11/10/00
Characteristics subject to change without notice.
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A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified)
A.C. Timing
Notes: (6) Typical values are for T
A
= 25C and nominal supply voltage.
(7) This parameter is periodically sampled and not 100% tested.
(8) MI in the A.C. timing diagram refers to the minimum incremental change in the V
W
output due to a change in the wiper position.
Symbol
Parameter
Limits
Units
Min.
Typ.
(6)
Max.
t
Cl
CS to INC Setup
100
ns
t
lD
INC HIGH to
U/D
Change
100
ns
t
DI
U/D
to INC Setup
2.9
s
t
lL
INC LOW Period
1
s
t
lH
INC HIGH Period
1
s
t
lC
INC Inactive to CS Inactive
1
s
t
CPH
CS Deselect Time
20
ms
t
IW
INC to V
W
Change
100
500
s
t
CYC
INC Cycle Time
4
s
t
R
, t
F
(7)
INC Input Rise and Fall Time
500
s
t
PU
(7)
Power up to Wiper Stable
500
s
t
R
V
CC
V
CC
Power-up Rate
0.2
50
mV/s
CS
INC
U/D
V
W
t
CI
t
IH
t
CYC
t
ID
t
DI
t
IW
MI
(8)
t
IC
t
CPH
t
F
t
R
10%
90%
90%
t
IL
X9314
REV 1.1 11/10/00
Characteristics subject to change without notice.
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PACKAGING INFORMATION
0.118 0.002
(3.00 0.05)
0.040 0.002
(1.02 0.05)
0.150 (3.81)
Ref.
0.193 (4.90)
0.030 (0.76)
0.036 (0.91)
0.032 (0.81)
0.007 (0.18)
0.005 (0.13)
0.008 (0.20)
0.004 (0.10)
0.0216 (0.55)
7 Typ.
R 0.014 (0.36)
0.118 0.002
(3.00 0.05)
0.012 + 0.006 / -0.002
(0.30 + 0.15 / -0.05)
0.0256 (0.65) Typ.
8-Lead Miniature Small Outline Gull Wing Package Type M
NOTE:
1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS)
0.220"
0.0256" Typical
0.025"
Typical
0.020"
Typical
8 Places
FOOTPRINT
Ref.
X9314
REV 1.1 11/10/00
Characteristics subject to change without notice.
8 of 9
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PACKAGING INFORMATION
0.150 (3.80)
0.158 (4.00)
0.228 (5.80)
0.244 (6.20)
0.014 (0.35)
0.019 (0.49)
Pin 1
Pin 1 Index
0.010 (0.25)
0.020 (0.50)
0.050 (1.27)
0.188 (4.78)
0.197 (5.00)
0.004 (0.19)
0.010 (0.25)
0.053 (1.35)
0.069 (1.75)
(4X) 7
0.016 (0.410)
0.037 (0.937)
0.0075 (0.19)
0.010 (0.25)
0 - 8
X 45
8-Lead Plastic Small Outline Gull Wing Package Type S
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
0.250"
0.050"Typical
0.050"
Typical
0.030"
Typical
8 Places
FOOTPRINT
X9314
LIMITED WARRANTY
Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Xicor, Inc. makes no warranty, express,
statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Xicor, Inc. makes
no warranty of merchantability or fitness for any purpose. Xicor, Inc. reserves the right to discontinue production and change specifications and prices at any time and
without notice.
Xicor, Inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xicor, Inc. product. No other circuits, patents, or licenses are implied.
TRADEMARK DISCLAIMER:
Xicor and the Xicor logo are registered trademarks of Xicor, Inc. AutoStore, Direct Write, Block Lock, SerialFlash, MPS, and XDCP are also trademarks of Xicor, Inc. All
others belong to their respective owners.
U.S. PATENTS
Xicor products are covered by one or more of the following U.S. Patents: 4,326,134; 4,393,481; 4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846;
4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829,482; 4,874,967; 4,883,976; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084,667; 5,153,880; 5,153,691; 5,161,137;
5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. Foreign patents and additional patents pending.
LIFE RELATED POLICY
In situations where semiconductor component failure may endanger life, system designers using this product should design the system with appropriate error detection and
correction, redundancy and back-up features to prevent such an occurence.
Xicor's products are not authorized for use in critical components in life support devices or systems.
1.
Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to
perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
2.
A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
REV 1.1 11/10/00
Characteristics subject to change without notice.
9 of 9
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Xicor, Inc. 2000 Patents Pending
Ordering Information
X9314 XDCP 10K
, Log Taper
X9314W
X
X
X
V
CC
Range
Blank = V
CC
= 5V 10%
3 = V
CC
= 3V to 5.5V (Not available in Industrial Temperature)
Temperature Range
Blank = 0C to +70C
I = 40C to +85C
Package
M = 8-Lead MSOP
S = 8-Lead SOIC
End to End Resistance
W = 10K
Part Mark Convention
X9314W
X
Blank = 8-Lead SOIC
(Date Code)
X
Blank = 5V 10%, 0C to 70C
I = 5V 10%, -40C to +85C
D = 3V to 5.5V, 0C to 70C
E = 3V to 5.5V, -40C to +85C
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