X9315Z [XICOR]
E 2 POT TM Nonvolatile Digital Potentiometer; Ë 2 POT TM非易失性数字电位器
| 型号： | X9315Z |
| 厂家： | 
XICOR INC. |
| 描述： | E 2 POT TM Nonvolatile Digital Potentiometer |
| 文件： | 总13页 (文件大小：76K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
APPLICATION NOTE
A V A I L A B L E
AN104
Low Noise, Low Power, 32 Taps
X9315
E2POTTM Nonvolatile Digital Potentiometer
FEATURES
DESCRIPTION
The Xicor X9315 is a solid state "micropower" nonvol-
atile potentiometer and is ideal for digitally controlled
resistance trimming.
• Low Power CMOS
—V = 2.7V to 5.5V, Single Supply
CC
—Active Current, 50µA (Increment) max
—Active Current, 400µA (Store) Max
—Standby Current, 1µA Max
• Low Noise
• 31 Resistive Elements
—Temperature Compensated
—± 20% End to End Resistance Range
The X9315 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 posi-
tion 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 sub-
sequent power-up operation.
—V to V Range
SS
CC
• 32 Wiper Tap Points
The resolution of the X9315 is equal to the maximum
resistance value divided by 31. As an example, for the
X9315W (10KΩ) each tap point represents 323Ω.
—Wiper Positioned via Three-Wire Interface
—Similar to TTL Up/Down Counter
—Wiper Position Stored in Nonvolatile Memory
and Recalled on Power-Up
• 100Year Wiper Position Data Retention
• X9315Z = 1KΩ
All Xicor nonvolatile digital potentiometers are de-
signed and tested for applications requiring extended
endurance and data retention.
• X9315W = 10KΩ
• Packages
—8-Lead SOIC
—8-Lead MSOP
—8-Pin DIP
FUNCTIONAL DIAGRAM
U/D
INC
CS
CMOS SWITCH
VH
5-BIT
UP/DOWN
COUNTER
ONE
OF
THIRTY-
TWO
5-BIT
NONVOLATILE
MEMORY
RESISTOR
ARRAY
WIPER
POSITION
DECODER
STOREAND
RECALL
CONTROL
CIRCUITRY
VL
VW
6732 FM1
E2POT™ is a trademark of Xicor, Inc.
6732-2.0 5/30/97 T1/C0/D0 SH
Characteristics subject to change without notice
1
X9315
PIN DESCRIPTIONS
PIN CONFIGURATION
V and V
H
L
The high (V ) and low (V ) terminals of the X9315 are
H
L
equivalent to the fixed terminals of a mechanical potenti-
ometer.The minimum voltage is V and the maximum is
DIP/SOIC/MSOP
SS
INC
U/D
1
2
3
4
8
7
6
5
V
CC
V
. It should be noted that the terminology of V and V
CC
L 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.
CS
X9315
V
V
L
H
V
V
W
SS
VW
V is the wiper terminal, equivalent to the movable
w
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
400Ω.
6732 FM2
PIN NAMES
Symbol
Up/Down (U/D)
Description
The U/D input controls the direction of the wiper move-
ment and whether the counter is incremented or decre-
mented.
V
High Terminal
Wiper Terminal
Low Terminal
Ground
H
V
W
V
L
Increment (INC)
V
SS
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.
V
CC
Supply Voltage
Up/Down Input
Increment Input
Chip Select Input
U/D
INC
CS
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 X9315
will be placed in the low power standby mode until the
device is selected once again.
6732 FM T01
2
X9315
DEVICE OPERATION
Operation Notes
The system may select the X9315, move the wiper and
deselect the device without having to store the latest
wiper position in nonvolatile memory. The wiper move-
ment 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.
There are three sections of the X9315: 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 trans-
fers the potential at that point to the wiper.
This would allow the system to always power-up to a pre-
set value stored in nonvolatile memory; then during sys-
tem 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
X9315 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 X9315
and then move the wiper up and down until the proper
trim is attained.
SYMBOL TABLE
WAVEFORM
INPUTS
OUTPUTS
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.
Must be
steady
Will be
steady
May change
from Low to
High
Will change
from Low to
High
The value of the counter is stored in nonvolatile memory
whenever CS transistions HIGH while the INC input is
also HIGH.
May change
from High to
Low
Will change
from High to
Low
When the X9315 is powered-down, the last counter posi-
tion 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.
Don’t Care:
Changes
Allowed
Changing:
State Not
Known
N/A
Center Line
is High
Impedance
6732 FM 3
3
X9315
ABSOLUTE MAXIMUM RATINGS*
*COMMENT
Temperature under Bias.........................–65°C to +135°C
Storage Temperature..............................–65°C to +150°C
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.
Voltage on CS, INC, U/D V , V and V
H
L
CC
with Respect to V .................................. –1V to +7V
SS
∆V = |V –V | .................................................................5V
H
L
Lead Temperature (Soldering 10 seconds)............. 300°C
Wiper Current ...........................................................±1mA
ANALOG CHARACTERISTICS
Electrical Characteristics
Temperature Coefficient
Temperature under Bias.........................–65°C to +135°C
End-to-End Resistance Tolerance .......................... ±20%
Power Rating at 25°C..............................................10mW
Wiper Current .................................................±1mA Max.
Typical Wiper Resistance ............................400Ω at 1mA
Typical Noise.................................. < –140dB√ Hz Ref: 1V
(–40°C to +85°C) ..............................+300 ppm/°C Typical
Ratiometric Temperature Coefficient ..................±20 ppm
Wiper Adjustability
Unlimited Wiper Adjustment (Non-Store operation)
Wiper Position Store Operations ..........................100,000
Physical Characteristics
Resolution
Marking Includes
Resistance ................................................................... 3%
Manufacturer’s Trademark
Resistance Value or Code
Date Code
Linearity
(1)
(3)
(2)
(2)
Absolute Linearity ...........................................±1.0 Ml
Relative Linearity ...........................................±0.2 Ml
Test Circuit #1
Test Circuit #2
V
H
V
H
TEST POINT
TEST POINT
VW
V
FORCE
CURRENT
W
V
L
V
L
6732 FM 5
6732 FM 4
Notes: (1) Absolute Linearity is utilized to determine actual wiper voltage versus expected voltage
= (V (actual) – V (expected)) = ±1 Ml Maximum.
w(n)
w(n)
(2) 1 Ml = Minimum Increment = R /31.
TOT
(3) Relative Linearity is a measure of the error in step size between taps = V
– [V
+ Ml] = +0.2 Ml.
W(n+1)
w(n)
4
X9315
RECOMMENDED OPERATING CONDITIONS
Temperature
Commercial
Industrial
Min.
0°C
Max.
+70°C
+85°C
Supply Voltage
X9315
Limits
5V ±10%
–40°C
X9315-2.7
2.7V to 5.5V
6732 PGM T02
6732 PGM T03
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)
Limits
(4)
Typ.
Symbol
Parameter
Min.
Max.
Units
Test Conditions
I
V
CC
Active Current
50
µA
CS = V , U/D = V or V and
CC1
IL
IL
IH
(Increment)
INC = 0.4V/2.4V @ max. t
CYC
I
V
Active Current
400
1
µA
µA
µA
CS = V , U/D = V or V
CC
CC2
IH
IL
IH
(Store)
and INC = V
IH
I
Standby Supply Current
CS = V
– 0.3V, U/D and
SB
CC
INC = V or V
– 0.3V
SS
CC
I
V
= V to V
IN SS
CS, INC, U/D Input
Leakage Current
CS, INC, U/D Input
HIGH Voltage
±10
LI
CC
V
V
+ 1
2
V
V
IH
CC
V
CS, INC, U/D Input
LOW Voltage
–0.5
0.8
IL
R
V
Wiper Resistence
VH Terminal Voltage
VL Terminal Voltage
400
1000
Ω
V
Max. Wiper Current ±1mA
W
V
V
VH
SS
CC
V
V
V
V
VL
SS
CC
(5)
V
= 5V, V = V
,
C
CS, INC, U/D Input
Capacitance
10
pF
CC
IN
SS
IN
T = 25°C, f = 1MHz
A
6732 PGM T04
STANDARD PARTS
Part Number
X9315Z
Maximum Resistance
Wiper Increments
32.3Ω
Minimum Resistance
1KΩ
100Ω
100Ω
X9315W
10KΩ
323Ω
6732 PGM T05
Notes: (4) Typical values are for T = 25°C and nominal supply voltage.
A
(5) This parameter is periodically sampled and not 100% tested.
5
X9315
A.C. CONDITIONS OF TEST
MODE SELECTION
Input Pulse Levels
0V to 3V
10ns
CS
L
INC
U/D
H
Mode
Input Rise and Fall Times
Input Reference Levels
Wiper Up
1.5V
L
L
Wiper Down
6732 PGM T06
H
X
L
X
Store Wiper Position
Standby
H
X
X
No Store, Return to Standby
6732 PGM T07
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified)
Limits
(6)
Typ.
Symbol
Parameter
Min.
100
100
2.9
1
Max.
Units
ns
t
t
t
t
t
t
t
t
t
t
t
CS to INC Setup
Cl
INC HIGH to U/D Change
U/D to INC Setup
ns
lD
µs
DI
INC LOW Period
µs
lL
INC HIGH Period
1
µs
lH
INC Inactive to CS Inactive
CS Deselect Time (NO STORE)
INC to Vw Change
1
µs
lC
100
ns
CPH
IW
1
5
5
µs
INC Cycle Time
4
µs
CYC
(7)
INC Input Rise and Fall Time
Power up to Wiper Stable
500
5
µs
t
(7)
,
R
F
µs
PU
(7)
CC
V
CC
Power-up Rate
0.2
50
10
mV/µs
t V
R
t
Store Cycle
ms
WR
6732 PGM T08
A.C. TIMING
CS
t
CYC
t
t
t
t
t
CPH
CI
IL
IH
IC
90% 90%
10%
INC
t
t
t
t
R
ID
DI
F
U/D
VW
t
IW
(8)
MI
6732 FM 06
Notes: (6) Typical values are for T = 25°C and nominal supply voltage.
A
(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 output due to a change in the wiper position.
W
6
X9315
TYPICAL NOISE
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
0
10
20
30
40
50
60
70
80
90 100 110 120 130 140 150 160 170 180 190 200
Frequenc y (KHz)
TYPICAL RTOTAL vs. TEMPERATURE
10000
9800
9600
9400
9200
9000
8800
8600
8400
8200
8000
-55
-45
-35 -25 -15 -5
5
35
45
C°
95 105 115 125
15
25
55
65
75
85
Temperature
7
X9315
TYPICAL TOTAL RESISTANCE TEMPERATURE COEFFICIENT
0
-50
-100
-150
PPM
-200
-250
-300
-350
-55 -45 -35 -25 -15
-5
5
15
25
35
45
55
65
75
85
95 105 115 125 °C
Temperature
TYPICAL WIPER RESISTANCE
800
700
600
500
400
300
200
100
0
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
Tap
8
X9315
TYPICAL ABSOLUTE % ERROR PER TAP POSITION
40.0%
30.0%
20.0%
10.0%
0.0%
-10.0%
-20.0%
-30.0%
-40.0%
0
3
6
9
12
15
18
21
24
27
30
Tap
TYPICAL RELATIVE % ERROR PER TAP POSITION
20.0%
15.0%
10.0%
5.0%
0.0%
-5.0%
-10.0%
-15.0%
-20.0%
0
3
6
9
12
15
18
21
24
27
30
Tap
9
X9315
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)
7° TYP
0.036 (0.91)
0.032 (0.81)
0.040 ± 0.002
(1.02 ± 0.05)
0.008 (0.20)
0.004 (0.10)
0.150 (3.81)
0.007 (0.18)
0.005 (0.13)
REF.
0.193 (4.90)
REF.
NOTE:
1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS)
3003 ILL 01
10
X9315
PACKAGING INFORMATION
8-LEAD PLASTIC DUAL IN-LINE PACKAGETYPE P
0.430 (10.92)
0.360 (9.14)
0.260 (6.60)
0.240 (6.10)
PIN 1 INDEX
PIN 1
0.060 (1.52)
0.300
(7.62) REF.
0.020 (0.51)
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)
0.150 (3.81)
0.125 (3.18)
0.065 (1.65)
0.045 (1.14)
0.110 (2.79)
0.090 (2.29)
0.020 (0.51)
0.016 (0.41)
0.325 (8.25)
0.300 (7.62)
0.015 (0.38)
MAX.
0°
TYP 0.010 (0.25)
.
15°
NOTE:
1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH
11
X9315
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)
0.020 (0.50)
0.050" TYPICAL
X 45°
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)
12
X9315
ORDERING INFORMATION
X9315X
X
X
X
V
Limits
CC
Blank = 5V ±10%
–2.7 = 2.7V to 5.5V
Temperature Range
Blank = Commercial = 0°C to +70°C
I = Industrial = –40°C to +85°C
Package
M = 8-Lead MSOP
P = 8-Lead Plastic DIP
S = 8-Lead SOIC
End to End Resistance
Z = 1KΩ
W = 10KΩ
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.
13
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