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NV Electronically Programmable
Capacitor
The Intersil X90100 is a non-volatile electronically
programmable capacitor. The device is programmed through
a simple digital interface. After programming, the chosen
setting for the device is retained by internal EEPROM
storage whether or not DC power is maintained. There are
32 programmable capacitance values selectable, ranging
from 7.5pF to 14.5pF in 0.23pF increments, in single-ended
mode. The dielectric is highly stable, and the capacitance
exhibits a very low voltage coefficient. It has virtually no
dielectric absorbtion and has a very low temperature drift
coefficient in differential mode (<50ppm/°C).
The X90100 is programmed through three digital interface
pins, which have Schmitt triggers and pullup resistors to
secure code retention. The three pins, INC, U/D, and CS,
are identical in operation to other Intersil chips with up/down
interface, such as the X9315 5-bit Digitally Controlled
Potentiometer (DCP).
Pinout
X90100
(8 LD MSOP)
TOP VIEW
INC
U/D
Vss
Cp
1
2
3
4
8 VCC
7 CS
6 N/C
5 Cm
February 2, 2005
X90100
FN8156.0
Features
• Non-volatile EEPROM storage of programmed trim codes
• Power On Recall of capacitance setting
• High-Performance Electronically Trimmable Capacitance
• Excellent linearity: <0.5 LSB error
• Very Simple Digital Interface
• Fast adjustments: 5µs max incremental change
• Eliminates the need for mechanical tuning
• Capacitance trimmable from 7.5pF to 14.5pF (single-
ended mode)
• Packages:
- MSOP (1.1mm x 3.0mm x 3.0mm)
Applications
• Post-trim of low-cost regenerative receivers
• Tunable RF stages
• Low-cost, Low temperature drift oscillators
• Garage door openers
• Keyless entry
• Industrial wireless control
• Capacitive sensor trimming
• RFID tags
Ordering Information
ORDERING
NUMBER
CTOTAL
X90100M8I 7.5pF to 14.5pF,
Single Ended
X90100M8IT1 7.5pF to 14.5pF,
Single Ended
PACKAGE
8 Ld MSOP
TEMP
RANGE
(°C)
-40 to +85
8 Ld MSOP -40 to +85
Tape and Reel
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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Block Diagram
X90100
Cm
CPAD
U/D
INC
1*CU
2*CU
4*CU
8*CU
16*CU
Logic and E2
Cp
CPAD
VSS
CS
VCC
Power On Reset
Pin Descriptions
MSOP
SYMBOL
1 INC
2 U/D
3 VSS
4 Cp
5 Cm
6 N/C
7 CS
8 VCC
BRIEF DESCRIPTION
Increment (INC). The INC input is negative-edge triggered. Toggling INC will move the capacitance value and
either increment or decrement the counter in the direction indicated by the logic level on the U/D input.
Up/Down (U/D). The U/D input controls the direction of the trimmed capacitor value and whether the counter
is incremented or decremented.
Ground.
Cp. The high (Cp) and low (Cm) terminals of the X90100 are equivalent to the fixed terminals of a mechanical
trimmable capacitor. The minimum dc voltage is VSS and the maximum is VCC. The value of capacitance
across the terminals is determined by digital inputs INC, U/D, and CS.
Cm. The high (Cp) and low (Cm) terminals of the X90100 are equivalent to the fixed terminals of a mechanical
trimmable capacitor. The minimum dc voltage is VSS and the maximum is VCC. The value of capacitance
across the terminals is determined by digital inputs INC, U/D, and CS.
Not Connected. Must be floating.
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 X90100 will be placed in the low power standby mode until the device is selected once again.
Positive Supply Voltage.
2 FN8156.0
February 2, 2005

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X90100
Absolute Maximum Ratings
Temperature under bias . . . . . . . . . . . . . . . . . . . . . .-65C to +135C
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Voltage on CS, INC, U/D, CP, and
CM with respect to VSS . . . . . . . . . . . . . . . . . . . . . . . . -1V to +7V
V = |VCP-VCM|. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V
Lead temperature (soldering 10 seconds) . . . . . . . . . . . . . . . . 300°C
CAUTION: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only; 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.
Capacitor Specifications VCC = +5V, TA = 25°C, single ended mode, CM = 0V, unless otherwise stated.
SYMBOL
PARAMETER
TEST CONDITIONS/NOTES MIN TYP (4)
MAX
UNIT
Absolute accuracy
±15 %
VCp
VCm
C
Cp terminal voltage
Cm terminal voltage
Capacitance increments
0
VCC
V
0
VCC
V
0.23 pF
C Capacitance range
7 pF
CTOTAL
CTOTAL
Q
Capacitance at Code=0
Capacitance at Code=31
Quality factor(5)
f = 315MHz
7.5 pF
14.5 pF
7
INL
DNL
TC1
VCC
Resolution
Absolute linearity error(1)
Relative linearity error(2)
CTOTAL Temperature Coefficient(5)
Supply Voltage
Differential Mode
5 bits
±0.15
lsb
±0.15
lsb
±50 ppm/°C
2.7 5.5 V
Notes: (1) Absolute linearity is used to determine actual capacitance versus expected capacitance = C(n)(actual) - C(n) (expected) = ±0.15 Ml.
(2) Relative linearity is a measure of the error in step size between settings = C(n+1)-[C(n) + Ml] = ±0.15 Ml.
(3) lsb = least significant bit = CTOT/31.
(4) Typical values are for TA = 25°C and nominal supply voltage.
(5) This parameter is not 100% tested.
DC Electrical Specifications VCC = 5V, TA = 25°C unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
ICC1 VCC active current (Increment)
ICC2
ISB
VCC active current (Store) (EEPROM
Store)
Standby supply current
ILI
VIH
VIL
CIN(5)
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
CS = VIL, U/D = VIL or VIH and
INC = 0.4V @ max. tCYC
CS = VIH, U/D = VIL or VIH and
INC = VIH @ max. tWR
CS = VCC - 0.3V, U/D and INC = VSS
or VCC - 0.3V
VIN = VSS
VCC x 0.7
-0.5
VCC = 5V, VIN = VSS, TA = 25°C,
f = 1MHz
TYP (4)
50
250
0.5
-15
MAX
100
500
2
VCC + 0.5
VCC x 0.1
10
UNIT
µA
µA
µA
µA
V
V
pF
3 FN8156.0
February 2, 2005