XICOR X9313

APPLICATION NOTES
A V A I L A B L E
AN42 • AN44–48 • AN50 • AN52 • AN53 • AN71 • AN73
Terminal
X9313 Voltage ±5V, 32 Taps
X9313
E2POT™ Nonvolatile Digital Potentiometer
FEATURES
DESCRIPTION
•
The Xicor X9313 is a solid state nonvolatile potentiometer and is ideal for digitally controlled resistance
trimming.
•
•
•
•
•
•
Low Power CMOS
—VCC = 3V to 5.5V
—Active Current, 3mA Max
—Standby Current, 500µA 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
X9313Z = 1KΩ
X9313W = 10KΩ
Packages
—8-Lead MSOP
—8-Lead PDIP
—8-Lead SOIC
The X9313 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 resolution of the X9313 is equal to the maximum
resistance value divided by 31. As an example, for the
X9313W (10KΩ) each tap point represents 323Ω.
All Xicor nonvolatile memories are designed and tested
for applications requiring extended endurance and data
retention.
FUNCTIONAL DIAGRAM
U/D
INC
CS
5-BIT
UP/DOWN
COUNTER
31
VH
30
29
5-BIT
NONVOLATILE
MEMORY
ONE
OF
THIRTYTWO
DECODER
28
TRANSFER
GATES
RESISTOR
ARRAY
2
VCC
GND
STORE AND
RECALL
CONTROL
CIRCUITRY
1
0
VL
VW
3866 FHD F01
E2POT™ is a trademark of Xicor, Inc.
©Xicor, Inc. 1994, 1995, 1996 Patents Pending
3866-1.5 6/12/96 T5/C1/D8 NS
1
Characteristics subject to change without notice
X9313
PIN DESCRIPTIONS
PIN CONFIGURATION
VH and VL
8-LEAD DIP/SOIC
The high (VH) and low (VL) terminals of the X9313 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 VL and VH
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.
INC
1
8
VCC
U/D
2
7
CS
6
VL
5
VW
VH
VSS
3
X9313
4
8-LEAD MSOP
VW
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 40Ω.
VH
1
VSS
2
VW
3
VL
4
X9313
8
U/D
7
INC
6
VCC
5
CS
3866 ILL F02.2
Up/Down (U/D)
The U/D input controls the direction of the wiper movement and whether the counter is incremented or
decremented.
PIN NAMES
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 X9313
will be placed in the low power standby mode until the
device is selected once again.
Symbol
Description
VH
VW
VL
VSS
VCC
U/D
INC
CS
High Terminal
Wiper Terminal
Low Terminal
Ground
Supply Voltage
Up/Down Input
Increment Input
Chip Select Input
3866 PGM T01
2
X9313
DEVICE OPERATION
Operation Notes
There are three sections of the X9313: 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 system may select the X9313, 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 the keep 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 INC, U/D and CS inputs control the movement of the
wiper along the resistor array. With CS set LOW the
X9313 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 thirty two wiper positions
along the resistive array.
The state of U/D may be changed while CS remains
LOW. This allows the host system to enable the X9313
and then move the wiper up and down until the proper
trim is attained.
TIW/RTOTAL
The electronic switches on the X9313 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 tIW (INC to VW
change). The RTOTAL value for the device can temporarily be reduced by a significant amount if the wiper is
moved several positions.
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.
RTOTAL with VCC Removed
When the X9313 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.
The end to end resistance of the array will fluctuate once
VCC is removed.
SYMBOL TABLE
WAVEFORM
3
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
N/A
Changing:
State Not
Known
Center Line
is High
Impedance
X9313
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 VCC
with Respect to VSS ............................... –1V to +7V
Voltage on VH and VL Referenced to VSS
∆V = |VH–VL|
X9313Z ............................................................. 4V
X9313W, X9313U, X9313T ............................ 10V
Lead Temperature (Soldering 10 seconds)....... 300°C
Wiper Current ..................................................... ±1mA
*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 specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
ANALOG CHARACTERISTICS
Electrical Characteristics
Temperature Coefficient
End-to-End Resistance Tolerance ..................... ±20%
Power Rating at 25°C
X9313Z ....................................................... 16mW
X9313W ...................................................... 10mW
Wiper Current ............................................ ±1mA Max.
Typical Wiper Resistance ......................... 40Ω at 1mA
Typical Noise .......................... < –120dB/ Hz Ref: 1V
(–40°C to +85°C)
X9313Z ....................................... +600 ppm/°C Typical
X9313W, X9313U, X9313T ........ +300 ppm/°C Typical
Ratiometric Temperature Coefficient ............ ±20 ppm
Wiper Adjustability
Unlimited Wiper Adjustment (Non-Store operation)
Wiper Position Store Operations ............... 10,000
Data Changes
Resolution
Resistance ............................................................. 3%
Physical Characteristics
Linearity
Marking Includes
Manufacturer’s Trademark
Resistance Value or Code
Date Code
Test Circuit #2
Absolute Linearity(1) ........................................ ±1.0 Ml(2)
Relative Linearity(3) ..................................... ±0.2 Ml(2)
Test Circuit #1
VH
VH
TEST POINT
TEST POINT
VW
VW
VL
VL
FORCE
CURRENT
3866 FHD F04
3866 FHD F05
Notes: (1) Absolute Linearity is utilized to determine actual wiper voltage versus expected voltage
= (Vw(n)(actual) – Vw(n)(expected)) = ±1 Ml Maximum.
(2) 1 Ml = Minimum Increment = RTOT/31.
(3) Relative Linearity is a measure of the error in step size between taps = VW(n+1) – [Vw(n) + Ml] = +0.2 Ml.
4
X9313
RECOMMENDED OPERATING CONDITIONS
Temperature
Min.
Max.
Supply Voltage
Limits
Commercial
Industrial
Military
0°C
–40°C
–55°C
+70°C
+85°C
+125°C
X9313
X9313-3
5V ±10%
3V to 5.5V
3866 PGM T04.1
3866 PGM T03.1
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)
Limits
Symbol
Parameter
ICC
VCC Active Current
ISB
Standby Supply Current
ILI
CS, INC, U/D Input
Leakage Current
CS, INC, U/D Input
HIGH Voltage
CS, INC, U/D Input
LOW Voltage
Wiper Resistence
VH Terminal Voltage
VL Terminal Voltage
CS, INC, U/D Input
Capacitance
VIH
VIL
RW
VVH
VVL
CIN(5)
Typ.(4)
Max.
Units
1
3
mA
200
500
µA
±10
µA
2
VCC + 1
V
–1
0.8
V
100
+5
+5
10
Ω
V
V
pF
Min.
40
–5
–5
Test Conditions
CS = VIL, U/D = VIL or VIH and
INC = 0.4V/2.4V @ max. tCYC
CS = VCC – 0.3V, U/D and INC =
VSS or VCC – 0.3V
VIN = VSS to VCC
Max. Wiper Current ±1mA
VCC = 5V, VIN = VSS,
TA = 25°C, f = 1MHz
3866 PGM T05.3
STANDARD PARTS
Part Number
Maximum Resistance
Wiper Increments
Minimum Resistance
X9313Z
X9313W
X9313U
X9313T
1KΩ
10KΩ
50KΩ
100KΩ
32.3Ω
323Ω
2381Ω
3226Ω
40Ω
40Ω
40Ω
40Ω
3866 PGM T08.1
Notes: (4) Typical values are for TA = 25°C and nominal supply voltage.
(5) This parameter is periodically sampled and not 100% tested.
5
X9313
A.C. CONDITIONS OF TEST
MODE SELECTION
Input Pulse Levels
Input Rise and Fall Times
Input Reference Levels
CS
0V to 3V
10ns
1.5V
INC
U/D
Mode
H
X
L
H
L
X
X
X
Wiper Up
Wiper Down
Store Wiper Position
Standby
No Store, Return to
Standby
L
L
3866 PGM T05.1
H
3866 PGM T06
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified)
Limits
Symbol
Parameter
Min.
tCl
tlD
tDI
tlL
tlH
tlC
tCPH
tIW
tCYC
tR, tF(7)
tPU(7)
tR VCC(7)
CS to INC Setup
INC HIGH to U/D Change
U/D to INC Setup
INC LOW Period
INC HIGH Period
INC Inactive to CS Inactive
CS Deselect Time
INC to Vw Change
INC Cycle Time
INC Input Rise and Fall Time
Power up to Wiper Stable
VCC Power-up Rate
100
100
2.9
1
1
1
20
Typ.(6)
100
Max.
500
4
500
500
50
0.2
Units
ns
ns
µs
µs
µs
µs
ms
µs
µs
µs
µs
mV/µs
3866 PGM T07.3
A.C. Timing
CS
tCYC
tCI
tIL
tIH
tIC
tCPH
90% 90%
10%
INC
tID
tDI
tF
tR
U/D
tIW
VW
MI
(8)
3866 FHD F03
Notes: (6) Typical values are for TA = 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 VW output due to a change in the wiper position.
6
X9313
PACKAGING INFORMATION
8-LEAD MINIATURE SMALL OUTLINE GULL WING PACKAGE TYPE M
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
R 0.014 (0.36)
0.118 ± 0.002
(3.00 ± 0.05)
0.030 (0.76)
0.0216 (0.55)
0.036 (0.91)
0.032 (0.81)
0.040 ± 0.002
(1.02 ± 0.05)
0.007 (0.18)
0.005 (0.13)
7° TYP
0.008 (0.20)
0.004 (0.10)
0.150 (3.81)
REF.
0.193 (4.90)
REF.
NOTE:
1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS)
3003 ILL 01
7
X9313
PACKAGING INFORMATION
8-LEAD PLASTIC DUAL IN-LINE PACKAGE TYPE P
0.430 (10.92)
0.360 (9.14)
0.260 (6.60)
0.240 (6.10)
PIN 1 INDEX
PIN 1
0.300
(7.62) REF.
HALF SHOULDER WIDTH ON
ALL END PINS OPTIONAL
0.145 (3.68)
0.128 (3.25)
SEATING
PLANE
0.025 (0.64)
0.015 (0.38)
0.065 (1.65)
0.045 (1.14)
0.150 (3.81)
0.125 (3.18)
0.020 (0.51)
0.016 (0.41)
0.110 (2.79)
0.090 (2.29)
0.015 (0.38)
MAX.
0.060 (1.52)
0.020 (0.51)
0.325 (8.25)
0.300 (7.62)
0°
15°
TYP. 0.010 (0.25)
NOTE:
1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH
3926 FHD F01
8
X9313
PACKAGING INFORMATION
8-LEAD PLASTIC SMALL OUTLINE GULL WING PACKAGE TYPE S
0.150 (3.80)
0.158 (4.00)
0.228 (5.80)
0.244 (6.20)
PIN 1 INDEX
PIN 1
0.014 (0.35)
0.019 (0.49)
0.188 (4.78)
0.197 (5.00)
(4X) 7°
0.053 (1.35)
0.069 (1.75)
0.004 (0.19)
0.010 (0.25)
0.050 (1.27)
0.010 (0.25)
X 45°
0.020 (0.50)
0.050" TYPICAL
0.050"
TYPICAL
0° – 8°
0.0075 (0.19)
0.010 (0.25)
0.250"
0.016 (0.410)
0.037 (0.937)
0.030"
TYPICAL
8 PLACES
FOOTPRINT
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
3926 FHD F22.1
9
X9313
ORDERING INFORMATION
X9313X
X
X
X
VCC Range
Blank = 4.5V to 5.5V
3 = 3V to 5.5V
Temperature Range
Blank = Commercial = 0°C to +70°C
I = Industrial = –40°C to +85°C
M = Military = –55°C to +125°C
Package
M = 8-Lead MSOP
P = 8-Lead Plastic DIP
S = 8-Lead SOIC
End to End Resistance
Z = 1KΩ
W = 10KΩ
U = 50KΩ
T = 100KΩ
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.
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