Document Outline
- Table of Contents
- Product Selection
- Data Sheet Alpha
- Ap Note Alpha
X9314
1
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
VL
VW
VH
U/D
INC
CS
VCC
GND
TRANSFER
GATES
Xicor, Inc. 1994, 1995, 1996 Patents Pending
Characteristics subject to change without notice
6427-1.7 6/12/96 T3/C1/D8 NS
E
2
POTTM is a trademark of Xicor, Inc.
DESCRIPTION
The Xicor X9314 is a solid state nonvolatile potentiom-
eter and is ideal for digitally controlled resistance trim-
ming.
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 nonvola-
tile memory and then be recalled upon a subsequent
power-up operation.
All Xicor nonvolatile Digitally Controlled Potentiometers
are designed and tested for applications requiring ex-
tended endurance and data retention.
FEATURES
Low Power CMOS
--V
CC
= 3V to 5.5V
--Active Current, 3mA Max
--Standby Current, 500
A Max
31 Resistive Elements
--Temperature Compensated
--
20% End to End Resistance Range
-- 5V to +5V Range
32 Wiper Tap Points
--Wiper Positioned via Three-Wire Interface
--Similar to TTL Up/Down Counter
--Wiper Position Stored in Nonvolatile
Memory and Recalled on Power-Up
100 Year Wiper Position Data Retention
X9314W = 10K
Packages
--8-Lead MSOP
--8-Lead PDIP
--8-Lead SOIC
FUNCTIONAL DIAGRAM
6427 FHD F01
E
2
POT
TM
Nonvolatile Digital Potentiometer
X9314
Terminal Voltage
5V, 32 Taps, Log Taper
A
PPLICATION
N
OTES
A V A I L A B L E
AN42 AN4450 AN52 AN53 AN71 AN73
X9314
2
PIN DESCRIPTIONS
V
H
and V
L
The high (V
H
) and low (V
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
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.
V
W
Vw 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 move-
ment 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.
ATTENUATION (dB)
TAP POSITION
6427 ILL F07
0
4
8
12
16
20
24
28
31
-20
-40
-43.5
0
-60
PIN CONFIGURATION
PIN NAMES
Symbol
Description
V
H
High Terminal
V
W
Wiper Terminal
V
L
Low Terminal
V
SS
Ground
V
CC
Supply Voltage
U/
D
Up/Down Input
INC
Increment Input
CS
Chip Select Input
6427 PGM T01
Typical Attenuation Characteristics (dB)
U/D
INC
VCC
CS
6427 ILL F02.2
VH
VSS
VW
VL
1
2
3
4
8
7
6
5
X9314
8-LEAD MSOP
VCC
CS
VL
VW
INC
U/D
VH
VSS
1
2
3
4
8
7
6
5
X9314
8-LEAD DIP/SOIC
X9314
3
DEVICE 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 mul-
tiple taps are connected to the wiper for t
IW
(
INC
to V
W
change). The R
TOTAL
value for the device can tempo-
rarily be reduced by a significant amount if the wiper is
moved several positions.
R
TOTAL
with V
CC
Removed
The end to end resistance of the array will fluctuate once
V
CC
is removed.
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
4
*COMMENT
Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device.
This is a stress rating only and the functional operation
of the device at these or any other conditions above
those listed in the operational sections of this specifica-
tion is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
ANALOG CHARACTERISTICS
Electrical Characteristics
End-to-End Resistance Tolerance .....................
20%
Power Rating at 25
C
X9314W ...................................................... 10mW
Wiper Current ............................................
1mA Max.
Typical Wiper Resistance ......................... 40
at 1mA
Typical Noise .......................... < 120dB/
Hz Ref: 1V
Relative Variation
Relative variation is a measure of the error in step size
between taps = log(V
w(n)
) log(V
w(n-1)
) = 0.07
0.003 for
tap n = 2 31
Temperature Coefficient
(40
C to +85
C)
X9314W ..................................... +600 ppm/
C Typical
Ratiometric Temperature Coefficient ............
20 ppm
Wiper Adjustability
Unlimited Wiper Adjustment (Non-Store operation)
Wiper Position Store Operations ............. 100,000
Data Changes
Physical Characteristics
Marking Includes
Manufacturer's Trademark
Resistance Value or Code
Date Code
Typical Electrical Taper
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
|
X9314W .......................................................... 10V
Lead Temperature (Soldering 10 seconds) ....... 300
C
Wiper Current .....................................................
1mA
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
100.0%
90.0%
80.0%
70.0%
60.0%
50.0%
40.0%
30.0%
20.0%
10.0%
0.0%
% Total Resistance
Tap
6427 ILL F06
X9314
5
FORCE
CURRENT
VL
VW
VH
TEST POINT
TEST POINT
VW
VH
VL
RECOMMENDED OPERATING CONDITIONS
Temperature
Min.
Max.
Commercial
0
C
+70
C
Industrial
40
C
+85
C
Military
55
C
+125
C
6427 PGM T03.1
Supply Voltage
Limits
X9314
5V
10%
X9314-3
3V to 5.5V
6427 PGM T04.1
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)
Limits
Symbol
Parameter
Min.
Typ.
(4)
Max.
Units
Test Conditions
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
10
A
V
IN
= V
SS
to V
CC
Leakage Current
V
IH
CS
,
INC
, U/
D
Input
2
V
CC
+ 1
V
HIGH Voltage
V
IL
CS
,
INC
, U/
D
Input
1
0.8
V
LOW Voltage
R
W
Wiper Resistance
40
100
Max. Wiper Current
1mA
V
VH
VH Terminal Voltage
5
+5
V
V
VL
VL Terminal Voltage
5
+5
V
C
IN
(5)
CS
,
INC
, U/
D
Input
10
pF
V
CC
= 5V, V
IN
= V
SS
,
Capacitance
T
A
= 25
C, f = 1MHz
6427 PGM T05.3
STANDARD PARTS
Part Number
Maximum Resistance
Wiper Increments
Minimum Resistance
X9314W
10K
Log Taper
40
6427 PGM T08.1
Notes: (4) Typical values are for T
A
= 25
C and nominal supply voltage.
(5) This parameter is periodically sampled and not 100% tested.
Test Circuit #1
Test Circuit #2
6427 ILL F04
6427 ILL F05
X9314
6
CS
INC
U/D
VW
tCI
tIL
tIH
tCYC
tID
tDI
tIW
MI
(8)
tIC
tCPH
tF
tR
10%
90%
90%
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified)
Limits
Symbol
Parameter
Min.
Typ.
(6)
Max.
Units
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 Vw 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
6427 PGM T07.3
A.C. CONDITIONS OF TEST
Input Pulse Levels
0V to 3V
Input Rise and Fall Times
10ns
Input Reference Levels
1.5V
6427 PGM T05.1
MODE SELECTION
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
6427 PGM T06
Notes: (6) Typical values are for T
A
= 25
C 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.
A.C. Timing
6427 FHD F03
X9314
7
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)
REF.
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)
3003 ILL 01
X9314
8
PACKAGING INFORMATION
3926 FHD F01
NOTE:
1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH
0.020 (0.51)
0.016 (0.41)
0.150 (3.81)
0.125 (3.18)
0.110 (2.79)
0.090 (2.29)
0.430 (10.92)
0.360 (9.14)
0.300
(7.62) REF.
PIN 1 INDEX
0.145 (3.68)
0.128 (3.25)
0.025 (0.64)
0.015 (0.38)
PIN 1
SEATING
PLANE
0.065 (1.65)
0.045 (1.14)
0.260 (6.60)
0.240 (6.10)
0.060 (1.52)
0.020 (0.51)
TYP. 0.010 (0.25)
0
15
8-LEAD PLASTIC DUAL IN-LINE PACKAGE TYPE P
HALF SHOULDER WIDTH ON
ALL END PINS OPTIONAL
0.015 (0.38)
MAX.
0.325 (8.25)
0.300 (7.62)
X9314
9
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
3926 FHD F22.1
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
10
X9314W
X
(Date Code)
X
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, licenses are
implied.
U.S. PATENTS
Xicor products are covered by one or more of the following U.S. Patents: 4,263,664; 4,274,012; 4,300,212; 4,314,265; 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. 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.
ORDERING INFORMATION
X9314W
X
X
X
X9314 E
2
POT 10K Ohms, Log Taper
P = 8-Lead Plastic DIP
Blank = 8-Lead SOIC
Blank = 5V
10%, 0
C to 70
C
I = 5V
10%, -40
C to +85
C
D = 3V to 5.5V, 0
C to 70
C
E = 3V to 5.5V, -40
C to +85
C
Part Mark Convention
V
CC
Range
Blank = V
CC
= 5V
10%
3 = V
CC
= 3V to 5.5V
Temperature Range
Blank = 0
C to +70
C
I = 40
C to +85
C
M = 55
C to +125
C
Package
M = 8-Lead MSOP
P = 8-Lead Plastic DIP
S = 8-Lead SOIC
End to End Resistance
W = 10K
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