CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTE:
1.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Potentiometer Specifications
Over recommended operating conditions unless otherwise stated.
SYMBOL
R
TOT
PARAMETER
End to end resistance
TEST CONDITIONS/NOTES
MIN
(Note 9)
9.375
37.5
V
R
R
H
, R
L
terminal voltages
Power rating
Noise
R
W
I
W
Wiper Resistance
Wiper Current
Resolution
Absolute linearity (Note 2)
Relative linearity (Note 3)
R
TOTAL
temperature coefficient
C
H
/C
L
/C
W
Potentiometer capacitances
V
H(n)(actual)
- V
H(n)(expected)
(Note 4)
V
H(n + 1)
- [V
H(n) + MI
] (Note 4)
(Note 7)
See circuit #2 (Note 7)
±35
10/10/25
(Note 6)
3
±1
±0.5
(Note 7)
Ref: 1kHz (Note 7)
-120
1100
±0.6
0
TYP
12.5
50
MAX
(Note 9)
15.625
62.5
V
CC
1
UNIT
k
k
V
mW
dBV
mA
%
MI
MI
ppm/°C
pF
DC Electrical Specifications
SYMBOL
I
CC1
PARAMETER
Over recommended operating conditions unless otherwise specified.
TEST CONDITIONS
CS = V
IL
, U/D = V
IL
or V
IH
and INC = 0.4V
@ max. t
CYC
V
CC
= 3V
CS = V
IL
, U/D = V
IL
or V
IH
and INC = 0.4V
@ max. t
CYC
V
CC
= 5V
MIN
(Note 9)
TYP
(Note 5)
50
200
MAX
(Note 9)
250
300
600
1400
1
2
±1
UNIT
µA
µA
µA
µA
µA
µA
µA
VCC active current (Increment)
I
CC2
VCC active current (Store)
(EEPROM Store)
CS = V
IH
, U/D = V
IL
or V
IH
and INC =
V
IH
@ max. t
WR
V
CC
= 3V
CS = V
IH
, U/D = V
IL
or V
IH
and INC =
V
IH
@ max. t
WR
V
CC
= 5V
I
SB
Standby supply current
CS = V
CC
- 0.3V, U/D and INC = V
SS
or
V
CC
- 0.3V V
CC
= 3V
CS = V
CC
- 0.3V, U/D and INC = V
SS
or
V
CC
- 0.3V V
CC
= 5V
I
LI
CS input leakage current
V
IN
= V
CC
FN8182 Rev 3.00
November 21, 2007
Page 3 of 7
X93156
DC Electrical Specifications
SYMBOL
I
LI
I
LI
I
LI
V
IH
V
IL
PARAMETER
CS input leakage current
CS input leakage current
INC, U/D input leakage current
CS, INC, U/D input HIGH voltage
CS, INC, U/D input LOW voltage
V
CC
= 3V, V
IN
= V
SS
, T
A
= +25°C, f = 1MHz
Over recommended operating conditions unless otherwise specified.
(Continued)
TEST CONDITIONS
V
CC
= 3V, CS = 0
V
CC
= 5V, CS = 0
V
IN
= V
SS
to V
CC
V
CC
x 0.7
-0.5
MIN
(Note 9)
60
120
TYP
(Note 5)
100
200
MAX
(Note 9)
150
250
±1
V
CC
+ 0.5
V
CC
x 0.1
10
UNIT
µA
µA
µA
V
V
pF
CS, INC, U/D input capacitance
C
IN
(Notes 7, 8)
NOTES:
2. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = (V
H(n)
(actual)-V
H(n)
(expected)) = ±1 Ml Maximum.
n = 1.. 29 only
3. Relative linearity is a measure of the error in step size between taps = V
H(n+1)
—[V
H(n)
+ Ml] = ±0.5 Ml, n = 1 .. 29 only.
4. 1 Ml = Minimum Increment = R
TOT
/31.
5. Typical values are for T
A
= +25°C and nominal supply voltage.
6. This parameter is periodically sampled and not 100% tested
7. This parameter is not 100% tested.
8. When performing multiple write operations, V
CC
must not decrease by more than 150mV from it’s initial value.
9. Parts are 100% tested at +25°C. Over-temperature limits established by characterization and are not production tested.
Endurance and Data Retention
PARAMETER
Minimum endurance
Data retention
MIN
200,000
100
UNIT
Data changes per bit
Years
Circuit #2 SPICE Macro Model
R
TOTAL
R
H
C
H
C
W
25pF
10pF
C
L
10pF
R
L
Test Circuit #1
TEST POINT
V
H
/R
H
AC Conditions of Test
Input pulse levels
Input rise and fall times
Input reference levels
0V to 3V
10ns
1.5V
AC Electrical Specifications
SYMBOL
t
Cl
t
lD
t
DI
t
lL
t
lH
t
lC
t
CPH
t
CPH
t
CYC
CS to INC setup
INC HIGH to U/D change
U/D to INC setup
INC LOW period
INC HIGH period
Over recommended operating conditions unless otherwise specified.
MIN
100
100
100
1
1
1
250
10
2
TYP
MAX
UNIT
ns
ns
ns
µs
µs
µs
ns
ms
µs
PARAMETER
INC Inactive to CS inactive
CS Deselect time (NO STORE)
CS Deselect time (STORE)
INC cycle time
FN8182 Rev 3.00
November 21, 2007
Page 4 of 7
X93156
AC Electrical Specifications
SYMBOL
t
R
, t
F
(Note 7)
t
R
V
CC
(Note 7)
t
WR
Over recommended operating conditions unless otherwise specified.
(Continued)
MIN
TYP
MAX
500
0.2
5
50
10
UNIT
µs
V/ms
ms
PARAMETER
INC input rise and fall time
VCC power-up rate
Store cycle
AC Timing
CS
t
CYC
t
CI
INC
t
ID
t
DI
t
F
t
IL
t
IH
t
IC
t
CPHS
90%
90%
10%
t
R
t
CPHNS
U/D
t
IW
R
W
MI
(Note 4)
Power-Up and Down Requirements
There are no restrictions on the power-up or power-down
conditions of V
CC
and the voltages applied to the
potentiometer pins provided that V
CC
is always more positive
than or equal to V
H
and V
L
, i.e., V
CC
V
H,
V
L
. The V
CC
ramp
rate spec is always in effect.
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 Descriptions
R
H
and R
L
The R
H
and R
L
pins of the X93156 are equivalent to the fixed
terminals of a mechanical potentiometer. The minimum voltage
is V
SS
and the maximum is V
CC
. The terminology of R
H
and
R
L
references the relative position of the terminal in relation to
wiper movement direction selected by 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 X93156 will be placed in the low
power standby mode until the device is selected once again.
R
w
The R
w
pin of the X93156 is the wiper terminal of the
potentiometer which is equivalent to the movable terminal of a
mechanical potentiometer.
Principles of Operation
There are three sections of the X93156: 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
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