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X9312WPM
Datasheet (XICOR)
9 pgs51.84 Kb0

Datasheet X9312ZSM, X9312ZSI, X9312ZS, X9312ZPM, X9312US Datasheet (XICOR)

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Page 1
APPLICATION NOTES
AVAILABLE
AN42 • AN44–48 • AN50 • AN52 • AN53 • AN71 • AN73
X9312
Terminal Voltage 0V to +15V, 100 Taps
X9312
E2POT™ Nonvolatile Digital Potentiometer
FEATURES
• Compatible with X9C102/103/104/503
• Low Power CMOS
—Active Current, 3mA Max —Standby Current, 1mA Max
• 99 Resistive Elements
—Temperature Compensated —±20% End to End Resistance Range — 0 to +15V Range
• 100 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
• X9312Z = 1KΩ
• X9312W = 10KΩ
• X9312U = 50KΩ
• X9312T = 100KΩ
FUNCTIONAL DIAGRAM
DESCRIPTION
The X9312 is a resistor array composed of 99 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 X9312 is equal to the maximum resistance value divided by 99. As an example, for the X9312U (50KΩ) each tap point represents 505Ω.
All Xicor nonvolatile memories are designed and tested for applications requiring extended endurance and data retention.
U/D INC
CS
V
CC
GND
E2POT™ is a trademark of Xicor, Inc.
©Xicor, Inc. 1994, 1995 Patents Pending Characteristics subject to change without notice 3865-2.4 12/1/95 T1/C0/D0 NS
7-BIT UP/DOWN COUNTER
7-BIT
NONVOLATILE
MEMORY
STORE AND
RECALL
CONTROL
CIRCUITRY
ONE
OF
ONE­HUNDRED DECODER
1
99
98
97
96
V
H
TRANSFER
GATES
2
1
0
RESISTOR
ARRAY
V V
L W
3865 FHD F01
Page 2
X9312
PIN DESCRIPTIONS VH and V
L
The high (VH) and low (VL) terminals of the X9312 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is 0V and the maximum is +15V. 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.
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 40Ω.
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.
PIN CONFIGURATION
DIP/SOIC
INC U/D
V
V SS
1 2
X9312
3
H
4
PIN NAMES
Symbol Description
V
H
V
W
V
L
V
SS
V
CC
High Terminal Wiper Terminal Low Terminal Ground Supply Voltage
U/D Up/Down Input
INC Increment Input CS Chip Select Input
8
V
CC
7
CS
6
V
L
5
V
W
3863 FHD F02.1
3865 PGM T01
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 X9312 will be placed in the low power standby mode until the device is selected once again.
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Page 3
X9312
DEVICE OPERATION
There are three sections of the X9312: 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 INC, U/D and CS inputs control the movement of the wiper along the resistor array. With CS set LOW the X9312 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 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.
Operation Notes
The system may select the X9312, 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 state of U/D may be changed while CS remains LOW. This allows the host system to enable the X9312 and then move the wiper up and down until the proper trim is attained.
TIW/R
TOTAL
value for the device can tempo-
TOTAL
rarily be reduced by a significant amount if the wiper is moved several positions.
R
with VCC Removed
TOTAL
SYMBOL TABLE
W
WAVEFORM
3
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
Page 4
X9312
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
with Respect to V
SS
Voltage on VH and VL Referenced to V
CC
...............................
SS
–1V to +7V
∆V = |VH–VL|
X9312Z, X9312W, X9312U, and X9312T.......15V
Lead Temperature (Soldering 10 seconds)....... 300°C
Wiper Current.....................................................±1mA
ANALOG CHARACTERISTICS Electrical Characteristics
End-to-End Resistance Tolerance ..................... ±20%
Power Rating at 25°C
X9312Z, ....................................................225mW
X9312W, X9312U, and X9312T .................25mW
Wiper Current............................................ ±1mA Max.
Typical Wiper Resistance......................... 40Ω at 1mA
Typical Noise..........................< –120dB/ Hz Ref: 1V
Resolution
Resistance ............................................................. 1%
Linearity
Absolute Linearity Relative Linearity
(1)
........................................
(3)
..................................... ±0.2 Ml
±1.0 Ml
(2) (2)
*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.
Temperature Coefficient
(–40°C to +85°C) X9312W, X9312U and
X9312T.......................................+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
Physical Characteristics
Marking Includes
Manufacturer’s Trademark Resistance Value or Code Date Code
Test Circuit #1 Test Circuit #2
V
H
TEST POINT
V
W
V
L
3865 FHD F04 3865 FHD F05
Notes: (1) Absolute Linearity is utilized to determine actual wiper voltage versus expected voltage
= (V
(actual) – V (2) 1 Ml = Minimum Increment = R (3) Relative Linearity is a measure of the error in step size between taps = V
w(n)
(expected)) = ±1 Ml Maximum.
w(n)
TOT
/99.
4
W(n+1)
– [V
w(n)
V
H
TEST POINT
V
W
FORCE
V
L
+ Ml] = +0.2 Ml.
CURRENT
Page 5
X9312
RECOMMENDED OPERATING CONDITIONS
Temperature Min. Max.
Commercial 0°C +70°C Industrial –40°C +85°C
Supply Voltage Limits
X9312 5V ±10%
3865 PGM T04.1
Military –55°C +125°C
3865 PGM T03.1
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)
Limits
Symbol Parameter Min. Typ.
I
I
CC
SB
VCC Active Current 1 3 mA CS = VIL, U/D = VIL or VIH and
Standby Supply Current 500 1000 µA CS = VCC – 0.3V, U/D and INC =
(4)
Max. Units Test Conditions
INC = 0.4V/2.4V @ max. t
CYC
VSS or VCC – 0.3V
I
LI
CS, INC, U/D Input ±10 µAVIN = V
SS
to V
CC
Leakage Current
V
IH
CS, INC, U/D Input 2 VCC + 1 V HIGH Voltage
V
IL
CS, INC, U/D Input –1 0.8 V LOW Voltage
R
W
V
VH
V
VL
C
IN
Wiper Resistence 40 100 Ω Max. Wiper Current ±1mA VH Terminal Voltage 0 15 V VL Terminal Voltage 0 15 V
(5)
CS, INC, U/D Input 10 pF VCC = 5V, VIN = VSS, Capacitance TA = 25°C, f = 1MHz
3865 PGM T05.3
STANDARD PARTS
Part Number Maximum Resistance Wiper Increments Minimum Resistance
X9312Z 1KΩ 10.1Ω 40Ω
X9312W 10KΩ 101Ω 40Ω
X9312U 50KΩ 505Ω 40Ω X9312T 100KΩ 1010Ω 40Ω
Notes: (4) Typical values are for TA = 25°C and nominal supply voltage.
(5) This parameter is periodically sampled and not 100% tested.
5
3865 PGM T08.1
Page 6
X9312
A.C. CONDITIONS OF TEST
Input Pulse Levels 0V to 3V Input Rise and Fall Times 10ns Input Reference Levels 1.5V
3865 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
3865 PGM T06
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified)
Limits
Symbol Parameter Min. Typ.
t
Cl
t
lD
t
DI
t
lL
t
lH
t
lC
t
CPH
t
IW
t
CYC
t
R, tF
t
PU
tR V
(7)
(7)
CC
(7)
CS to INC Setup 100 ns INC HIGH to U/D Change 100 ns U/D to INC Setup 1 µs INC LOW Period 1 µs INC HIGH Period 1 µs INC Inactive to CS Inactive 1 µs CS Deselect Time 20 ms INC to Vw Change 100 500 µs INC Cycle Time 4 µs INC Input Rise and Fall Time 500 µs
Power up to Wiper Stable 500 µs VCC Power-up Rate 0.2 50 mV/µs
(6)
Max. Units
3865 PGM T07.4
A.C. Timing
CS
t
CYC
t
CI
INC
U/D
t
IW
V
W
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.
t
IL
t
ID
t
IH
t
IC
t
DI
MI
6
(8)
t
CPH
t
F
90% 90%
10%
t
R
3865 FHD F03
Page 7
X9312
PACKAGING INFORMATION
8-LEAD PLASTIC DUAL IN-LINE PACKAGE TYPE P
0.092 (2.34) DIA. NOM.
PIN 1 INDEX
PIN 1
0.430 (10.92)
0.360 (9.14)
0.300
(7.62) REF.
0.255 (6.47)
0.245 (6.22)
0.060 (1.52)
0.020 (0.51)
HALF SHOULDER WIDTH ON
ALL END PINS OPTIONAL
SEATING
PLANE
0.150 (3.81)
0.125 (3.18)
0.110 (2.79)
0.090 (2.29)
0.015 (0.38) MAX.
TYP. 0.010 (0.25)
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
0.325 (8.25)
0.300 (7.62)
0.062 (1.57)
0.058 (1.47)
0.020 (0.51)
0.016 (0.41)
0.140 (3.56)
0.130 (3.30)
0.020 (0.51)
0.015 (0.38)
0°
15°
3926 FHD F01
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Page 8
X9312
PACKAGING INFORMATION
8-LEAD PLASTIC SMALL OUTLINE GULL WING PACKAGE TYPE S
PIN 1 INDEX
(4X) 7°
0.050 (1.27)
PIN 1
0.014 (0.35)
0.019 (0.49)
0.188 (4.78)
0.197 (5.00)
0.010 (0.25)
0.020 (0.50)
X 45°
0.150 (3.80)
0.158 (4.00)
0.004 (0.19)
0.010 (0.25)
0.228 (5.80)
0.244 (6.20)
0.053 (1.35)
0.069 (1.75)
0° – 8°
0.0075 (0.19)
0.010 (0.25)
0.027 (0.683)
0.037 (0.937)
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESIS IN MILLIMETERS)
3926 FHD F22
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Page 9
X9312
ORDERING INFORMATION
X9312X X X
Temperature Range
Blank = Commercial = 0°C to +70°C I = Industrial = –40°C to +85°C M = Military = –55°C to +125°C
Package
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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