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.
NOTES:
1. Absolute linearity is utilized to determine actual wiper resistance vs expected resistance = (V
H(n)
(actual) - V
H(n)
(expected)) = ±1 Ml Maximum.
n = 1 .. 29 only.
2. 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.
3. 1 Ml = Minimum Increment = R
TOT
/31.
4. Typical values are for T
A
= +25°C and nominal supply voltage.
5. Limits established by characterization and are not production tested.
6. When performing multiple write operations, V
CC
must not decrease by more than 150mV from its initial value.
7. Parts are 100% tested at +25°C. Temperature limits established by characterization and are not production tested.
Potentiometer Characteristics
Over recommended operating conditions, unless otherwise stated.
SYMBOL
R
TOT
PARAMETER
End-to-End Resistance
TEST CONDITIONS/NOTES
W option
U option
V
R
R
H
, R
L
Terminal Voltages
Power Rating
Noise
R
W
I
W
Wiper Resistance
Wiper Current
Resolution
Absolute Linearity (Note 1)
Relative Linearity (Note 2)
R
TOTAL
Temperature Coefficient
C
H
/C
L
/C
W
Potentiometer Capacitances
V
H(n)(actual)
- V
H(n)(expected)
V
H(n+1)
- [V
H(n) + MI
]
(Note 5)
See “Circuit #2 SPICE Macro Model” on
page 4
±35
10/10/25
R
TOTAL
½50k(Note
5)
Ref: 1kHz (Note 5)
((Note 5)
(Notes 5)
3
±1
±0.5
-120
1100
0.6
MIN
(Note 7)
9.375
37.5
0
TYP
(Note 4)
12.5
50
MAX
(Note 7)
15.625
62.5
V
CC
1
UNIT
k
k
V
mW
(Note 6)
dBV
(Note 6)
mA
%
MI
(Note 3)
MI
(Note 3)
ppm/°C
pF
(Note 5)
FN8188 Rev 2.00
February 1, 2008
Page 3 of 7
X93256
DC Operating Characteristics
SYMBOL
I
CC1
PARAMETER
VCC Active Current (Increment)
Over recommended operating conditions, unless otherwise stated.
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
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
I
LI
I
LI
I
LI
V
IH
V
IL
C
IN
(Note 6)
CS input Leakage Current
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
CS, INC, U/D Input Capacitance
V
CC
= 3V, V
IN
= V
SS
, T
A
= +25°C,
f = 1MHz (Note 5)
V
IN
= V
CC
V
CC
= 3V, CS = 0
V
CC
= 5V, CS = 0
V
IN
= V
SS
to V
CC
V
CC
x 0.7
-0.5
60
120
100
200
MIN
(Note 7)
TYP
(Note 4)
50
200
MAX
(Note 7)
250
300
600
1400
1
4
±1
150
250
±1
V
CC
+ 0.5
V
CC
x 0.1
10
µA
µA
µA
µA
µA
µA
µA
µA
V
V
pF
UNIT
µA
Endurance and Data Retention
PARAMETER
Minimum endurance
Data retention
MIN
200,000
100
UNIT
Data changes per bit
Years
AC Conditions of Test
Input pulse levels
Input rise and fall times
Input reference levels
0V to 3V
10ns
1.5V
Test Circuit #1
TEST POINT
V
H
/R
H
Circuit #2 SPICE Macro Model
R
TOTAL
R
H
C
H
C
W
25pF
10pF
C
L
10pF
R
L
AC Operating Characteristics
Over recommended operating conditions, unless otherwise specified. In the table, CS, INC, U/D, R
H
and
R
L
are used to refer to either CS
1
or CS
2
, etc.
MIN
(Note 7)
100
100
100
1
1
TYP
(Note 4)
MAX
(Note 7)
SYMBOL
t
Cl
t
lD
t
DI
t
lL
t
lH
CS to INC Setup
PARAMETER
UNIT
ns
ns
ns
µs
µs
INC HIGH to U/D Change
U/D to INC Setup
INC LOW Period
INC HIGH Period
FN8188 Rev 2.00
February 1, 2008
Page 4 of 7
X93256
AC Operating Characteristics
Over recommended operating conditions, unless otherwise specified. In the table, CS, INC, U/D, R
H
and
R
L
are used to refer to either CS
1
or CS
2
, etc.
(Continued)
MIN
(Note 7)
1
250
10
2
500
0.2
5
50
10
TYP
(Note 4)
MAX
(Note 7)
SYMBOL
t
lC
t
CPH
t
CPH
t
CYC
t
R
, t
F
(Note 5)
t
R
V
CC
(Note 5)
t
WR
PARAMETER
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
UNIT
µs
ns
ms
µs
µs
V/ms
ms
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
Note: CS, INC, U/D, R
H
and R
L
are used to refer
to either CS
1
or CS
2
, etc.
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.
Up/Down (U/D)
The U/D input controls the direction of a single potentiometer’s
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
pertaining potentiometer’s counter in the direction indicated by
the logic level on the pertaining potentiometer’s U/D input.
Pin Descriptions
In the text, CS, INC, U/D, R
H
, R
W
, and R
L
are used to refer to
either CS
1
or CS
2
, etc. Note: These signals can be applied
independently or at the same time.
Chip Select (CS)
A potentiometer is selected when the pertaining CS input is LOW.
Its current counter value is stored in nonvolatile memory when the
pertaining CS is returned HIGH while the pertaining INC input is
also HIGH. After the store operation is complete the affected
potentiometer will be placed in the low power standby mode until
the potentiometer is selected once again.
R
H
and R
L
The R
H
and R
L
pins of the X93256 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 per
potentiometer.
Principles of Operation
There are multiple sections for each potentiometer in the
X93256: an input control, a counter and decode section; the
nonvolatile memory; and a resistor array. Each input control
section operates just like an up/down counter. The output of
R
W
The R
W
pin of the X93256 is the wiper terminal of the
potentiometer, which is equivalent to the movable terminal of a
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