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:
4. When performing multiple write operations, V
CC
must not decrease by more than 150mV from its initial value.
Potentiometer Specifications
SYMBOL
R
TOT
V
R
Across recommended operating conditions unless otherwise stated.
TEST CONDITIONS/NOTES
MIN
(Note
10)
35
0
R
TOTAL
½50kΩ
Ref: 1kHz
(Note
9)
(Note
9)
3
V
H(n)(actual)
-V
H(n)(expected)
V
H(n+1)
-[V
H(n)+MI
]
(Note
9)
See
“Circuit #2 SPICE Macro
Model” on page 4
±35
10/10/25
±1
±0.5
-120
1000
0.6
TYP
(Note
8)
50
MAX
(Note
10)
65
V
CC
1
UNIT
kΩ
V
mW
(Note
9)
dBV
(Note
9)
Ω
mA
%
MI
(Note
7)
MI
(Note
7)
ppm/°C
pF
(Note
9)
PARAMETER
End-to-End Resistance
R
H
, R
L
Terminal Voltages
Power Rating
Noise
R
W
I
W
Wiper Resistance
Wiper Current
Resolution
Absolute Linearity (Note
5)
Relative Linearity (Note
6)
R
TOTAL
Temperature Coefficient
C
H
/C
L
/C
W
Potentiometer Capacitances
DC Electrical Specifications
Across recommended operating conditions, unless otherwise specified.
SYMBOL
I
CC1
I
CC2
I
SB
I
LI
I
LI
I
LI
V
IH
V
IL
C
IN
(Note
9)
PARAMETER
VCC Active Current (Increment)
VCC Active Current (Store)
(EEPROM Store)
Standby Supply Current
CS
CS
INC, U/D Input Leakage Current
CS, INC, U/D Input HIGH Voltage
CS, INC, U/D Input LOW Voltage
CS, INC, U/D Input Capacitance
V
CC
= 3V, V
IN
= V
SS
, T
A
= +25°C, f = 1MHz
TEST CONDITIONS
CS = V
IL
, U/D = V
IL
or V
IH
and INC = 0.4V at
max. t
CYC
CS = V
IH
, U/D = V
IL
or V
IH
and INC = V
IH
at
max. t
WR
CS = V
CC
- 0.3V, U/D and INC = V
SS
or
V
CC
- 0.3V
V
IN
= V
CC
V
CC
= 3V, CS = 0
V
IN
= V
SS
to V
CC
V
CC
x 0.7
-0.5
60
100
MIN
(Note
10)
TYP
(Note
8)
50
MAX
(Note
10)
250
600
1
±1
150
±1
V
CC
+ 0.5
V
CC
x 0.1
10
UNIT
µA
µA
µA
µA
µA
µA
V
V
pF
FN8180 Rev 4.00
July 18, 2014
Page 3 of 8
X93154
Endurance and Data Retention
PARAMETER
Minimum endurance
Data retention
MIN
200,000
100
UNIT
Data changes per bit
Years
R
H
C
H
C
W
25pF
TEST POINT
V
H
/R
H
10pF
R
TOTAL
C
L
10pF
R
L
Circuit #2 SPICE Macro Model
Test Circuit #1
AC Conditions of Test
Input pulse levels
Input rise and fall times
Input reference levels
0V to 3V
10ns
1.5V
AC Electrical Specifications
Across recommended operating conditions unless otherwise specified.
SYMBOL
t
Cl
t
lD
t
DI
t
lL
t
lH
t
lC
t
CPH
t
CPH
t
CYC
t
R
, t
F
(Note
9)
t
R
V
CC
(Note
9)
t
WR
NOTES:
5. 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.
6. 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.
7. 1 Ml = Minimum Increment = R
TOT
/31.
8. Typical values are for T
A
= +25°C and nominal supply voltage.
9. Limits established by characterization and are not production tested.
10. Parts are 100% tested at +25°C. Over-temperature limits established by characterization and are not production tested.
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 (No Store)
CS Deselect Time (Store)
INC Cycle Time
INC Input Rise and Fall Time
VCC Power-up Rate
Store Cycle
1.0
5
PARAMETER
MIN
(Note
10)
100
100
100
1
1
1
250
10
2
500
50
10
TYP
(Note
8)
MAX
(Note
10)
UNIT
ns
ns
ns
µs
µs
µs
ns
ms
µs
µs
V/ms
ms
FN8180 Rev 4.00
July 18, 2014
Page 4 of 8
X93154
AC Timing
CS
t
CYC
t
CI
INC
t
ID
t
DI
t
F
t
IL
t
IH
t
IC
(STORE)
t
CPH
90%
10%
t
R
90%
U/D
Power-Up and Power-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 specification is always in effect.
Pin Names
SYMBOL
RH
RL
VSS
VCC
U/D
INC
CS
High terminal
Low terminal
Ground
Supply voltage
Up/Down control input
Increment control input
Chip Select control input
DESCRIPTION
Pin Descriptions
R
H
and R
L
The R
H
and R
L
pins of the X93154 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.
Principles of Operation
There are three sections of the X93154: 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 connection at that point to the wiper.
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.
If the wiper is moved several positions, multiple taps are
connected to the wiper for t
IW
(INC to V
W
change). The
2-terminal resistance value for the device can temporarily
change by a significant amount if the wiper is moved several
positions.
When the device is powered down, the last wiper position
stored will be maintained in the nonvolatile memory. When
power is restored, the contents of the memory are recalled and
the wiper is set to the value last stored.
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.
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 X93154 will be placed in the low
power standby mode until the device is selected once again.
京公网安备 11010802033920号
EEWORLD
