REV 1.1.6 1/30/03

Characteristics subject to change without notice.

1 of 22

www.xicor.com

Low Noise/Low Power/SPI Bus

X9400

Quad Digitally Controlled Potentiometers (XDCP

)

FEATURES

· Four potentiometers per package
· 64 resistor taps
· SPI serial interface for write, read, and transfer

operations of the potentiometer

· Wiper resistance, 40

typical at 5V.

· Four non-volatile data registers for each

potentiometer

· Non-volatile storage of multiple wiper position
· Power on recall. Loads saved wiper position on

power up.

· Standby current < 1µA max
· System V

: 2.7V to 5.5V operation

· Analog V

: -5V to +5V

· 10K

, 2.5K

End to end resistance

· 100 yr. data retention
· Endurance: 100,000 data changes per bit per

register

· Low power CMOS
· 24-lead SOIC, 24-lead TSSOP, and 24-lead CSP

(Chip Scale Package) packages

DESCRIPTION

The X9400 integrates four digitally controlled
potentiometers (XDCPs) on a monolithic CMOS
integrated circuit.

The digitally controlled potentiometer is implemented
using 63 resistive elements in a series array. Between
each element are tap points connected to the wiper
terminal through switches. The position of the wiper on
the array is controlled by the user through the SPI
serial bus interface. Each potentiometer has
associated with it a volatile Wiper Counter Register
(WCR) and four nonvolatile Data Registers (DR0-3)
that can be directly written to and read by the user.
The contents of the WCR controls the position of the
wiper on the resistor array through the switches.
Power up recalls the contents of DR0 to the WCR.

The XDCP can be used as a three-terminal
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.

BLOCK DIAGRAM

Interface

and

Control

Circuitry

SCK

A0
A1

R0 R1

R2 R3

Wiper

Counter

(WCR)

Resistor

Array
Pot 1

R0 R1

R2 R3

Wiper

Counter

(WCR)

Data

R0 R1

R2 R3

Resistor

Array

R0 R1

R2 R3

Resistor

Array

Wiper

Counter

(WCR)

Wiper

Counter

(WCR)

Pot 3

Pot 2

HOLD

Pot 0

V+

V-

PPLICATION

OTES

A V A I L A B L E

AN99 · AN115 · AN120 · AN124 · AN133 · AN134 · AN135

X9400

Characteristics subject to change without notice.

2 of 22

REV 1.1.6 1/30/03

www.xicor.com

PIN DESCRIPTIONS

Host Interface Pins

Serial Output (SO)

SO is a push/pull serial data output pin. During a read
cycle, data is shifted out on this pin. Data is clocked
out by the falling edge of the serial clock.

Serial Input

SI is the serial data input pin. All opcodes, byte
addresses and data to be written to the pots and pot
registers are input on this pin. Data is latched by the
rising edge of the serial clock.

Serial Clock (SCK)

The SCK input is used to clock data into and out of the
X9400.

Chip Select (CS)

When CS is HIGH, the X9400 is deselected and the
SO pin is at high impedance, and (unless an internal
write cycle is underway) the device will be in the
standby state. CS LOW enables the X9400, placing it
in the active power mode. It should be noted that after
a power-up, a HIGH to LOW transition on CS is
required prior to the start of any operation.

Hold (HOLD)

HOLD is used in conjunction with the CS pin to select
the device. Once the part is selected and a serial
sequence is underway, HOLD may be used to pause
the serial communication with the controller without

resetting the serial sequence. To pause, HOLD must
be brought LOW while SCK is LOW. To resume
communication, HOLD is brought HIGH, again while
SCK is LOW. If the pause feature is not used, HOLD
should be held HIGH at all times.

Device Address (A

)

The address inputs are used to set the least significant
2 bits of the 8-bit slave address. A match in the slave
address serial data stream must be made with the
address input in order to initiate communication with
the X9400. A maximum of 4 devices may occupy the
SPI serial bus.

Potentiometer Pins

), V

)

The V

and V

inputs are equivalent to the

terminal connections on either end of a mechanical
potentiometer.

)

The wiper outputs are equivalent to the wiper output of
a mechanical potentiometer.

Hardware Write Protect Input (WP)

The WP pin when LOW prevents nonvolatile writes to
the Data Registers.

Analog Supplies (V+, V-)

The analog Supplies V+, V- are the supply voltages for
the XDCP analog section.

PIN CONFIGURATION

V+

HOLD

SCK

SOIC

X9408

V-

V+

TSSOP

X9408

HOLD

V-

SCK

Top ViewBumps Down

V+

HOLD

SCK

V-

CSP

X9400

Characteristics subject to change without notice.

3 of 22

REV 1.1.6 1/30/03

www.xicor.com

PIN NAMES

DEVICE DESCRIPTION

The X9400 is a highly integrated microcircuit
incorporating four resistor arrays and their associated
registers and counters and the serial interface logic
providing direct communication between the host and
the XDCP potentiometers.

Serial Interface

The X9400 supports the SPI interface hardware
conventions. The device is accessed via the SI input
with data clocked in on the rising SCK. CS must be
LOW and the HOLD and WP pins must be HIGH
during the entire operation.

The SO and SI pins can be connected together, since
they have three state outputs. This can help to reduce
system pin count.

Array Description

The X9400 is comprised of four resistor arrays. Each
array contains 63 discrete resistive segments that are
connected in series. The physical ends of each array
are equivalent to the fixed terminals of a mechanical
potentiometer (V

and V

inputs).

At both ends of each array and between each resistor
segment is a CMOS switch connected to the wiper
(V

) output. Within each individual array only one

switch may be turned on at a time.

These switches are controlled by a wiper counter
register (WCR). The six bits of the WCR are decoded
to select, and enable, one of sixty-four switches.

Wiper Counter Register (WCR)

The X9400 contains four Wiper Counter Registers,
one for each XDCP potentiometer. The WCR is
equivalent to a serial-in, parallel-out register/counter
with its outputs decoded to select one of sixty-four
switches along its resistor array. The contents of the
WCR can be altered in four ways: it may be written
directly by the host via the write Wiper Counter
Register instruction (serial load); it may be written
indirectly by transferring the contents of one of four
associated data registers via the XFR Data Register or
global XFR data register instructions (parallel load); it
can be modified one step at a time by the increment/
decrement instruction. Finally, it is loaded with the
contents of its Data Register zero (DR0) upon power-
up.

The Wiper Counter Register is a volatile register; that
is, its contents are lost when the X9400 is powered-
down. Although the register is automatically loaded
with the value in DR0 upon power-up, this may be
different from the value present at power-down.

Data Registers

Each potentiometer has four 6-bit nonvolatile Data
Registers. These can be read or written directly by the
host. Data can also be transferred between any of the
four Data Registers and the associated Wiper Counter
Register. All operations changing data in one of the
data registers is a nonvolatile operation and will take a
maximum of 10ms.

If the application does not require storage of multiple
settings for the potentiometer, the Data Registers can
be used as regular memory locations for system
parameters or user preference data.

Data Register Detail

Symbol

Description

SCK

Serial Clock

SI, SO

Serial Data

-A

Device Address

Potentiometer Pins (terminal
equivalent)

Potentiometer Pins (wiper
equivalent)

Hardware Write Protection

System Supply Voltage

System Ground

No Connection

(MSB)

(LSB)

X9400

Characteristics subject to change without notice.

4 of 22

REV 1.1.6 1/30/03

www.xicor.com

Write in Process

The contents of the Data Registers are saved to
nonvolatile memory when the CS pin goes from LOW
to HIGH after a complete write sequence is received by
the device. The progress of this internal write operation
can be monitored by a write in process bit (WIP). The
WIP bit is read with a read status command.

INSTRUCTIONS

Identification (ID) Byte

The first byte sent to the X9400 from the host, following
a CS going HIGH to LOW, is called the Identification
byte. The most significant four bits of the slave address
are a device type identifier, for the X9400 this is fixed
as 0101[B] (refer to Figure 2).

The two least significant bits in the ID byte select one of
four devices on the bus. The physical device address is
defined by the state of the A

-A

input pins. The X9400

compares the serial data stream with the address input
state; a successful compare of both address bits is

required for the X9400 to successfully continue the
command sequence. The A

inputs can be actively

driven by CMOS input signals or tied to V

or V

The remaining two bits in the slave byte must be set to 0.

Figure 2. Identification Byte Format

Instruction Byte

The next byte sent to the X9400 contains the
instruction and register pointer information. The four
most significant bits are the instruction. The next four
bits point to one of the four pots and, when applicable,
they point to one of four associated registers. The
format is shown below in Figure 3.

Device Type

Identifier

Device Address

Figure 1. Detailed Potentiometer Block Diagram

Serial Data Path

From Interface

Circuitry

Serial
Bus
Input

Parallel
Bus
Input

Wiper

Counter

INC/DEC

Logic

UP/DN

CLK

Modified SCL

UP/DN

If WCR = 00[H] then V

= V

If WCR = 3F[H] then V

= V

o
u
n

e
c
o
d
e

(WCR)

(One of Four Arrays)

X9400

Characteristics subject to change without notice.

5 of 22

REV 1.1.6 1/30/03

www.xicor.com

Figure 3. Instruction Byte Format

The four high order bits of the instruction byte specify
the operation. The next two bits (R

and R

) select one

of the four registers that is to be acted upon when a
register oriented instruction is issued. The last two bits
(P1 and P

) selects which one of the four

potentiometers is to be affected by the instruction.

Four of the ten instructions are two bytes in length and
end with the transmission of the instruction byte. These
instructions are:

XFR Data Register to Wiper Counter Register--This

transfers the contents of one specified Data Register
to the associated Wiper Counter Register.

XFR Wiper Counter Register to Data Register --This

transfers the contents of the specified Wiper Counter
Register to the specified associated Data Register.

Global XFR Data Register to Wiper Counter Register --

This transfers the contents of all specified Data
Registers to the associated Wiper Counter Registers.

Global XFR Wiper Counter Register to Data Register --

This transfers the contents of all Wiper Counter
Registers to the specified associated Data Registers.

The basic sequence of the two byte instructions is
illustrated in Figure 4. These two-byte instructions
exchange data between the WCR and one of the data
registers. A transfer from a Data Register to a WCR is
essentially a write to a static RAM, with the static RAM
controlling the wiper position. The response of the wiper
to this action will be delayed by t

WRL

. A transfer from

the WCR (current wiper position), to a data register is a
write to nonvolatile memory and takes a minimum of

to complete. The transfer can occur between one of

the four potentiometers and one of its associated
registers; or it may occur globally, where the transfer
occurs between all potentiometers and one associated
register.

Five instructions require a three-byte sequence to
complete. These instructions transfer data between the
host and the X9400; either between the host and one of
the data registers or directly between the host and the
Wiper Counter Register. These instructions are:

Read Wiper Counter Register--read the current

wiper position of the selected pot,

Write Wiper Counter Register--change current wiper

position of the selected pot,

Read Data Register--read the contents of the

selected data register;

Write Data Register--write a new value to the

selected data register.

Read Status--This command returns the contents of

the WIP bit which indicates if the internal write cycle
is in progress.

The sequence of these operations is shown in Figure 5
and Figure 6.

The final command is Increment/Decrement. It is
different from the other commands, because it's length is
indeterminate. Once the command is issued, the master
can clock the selected wiper up and/or down in one
resistor segment steps; thereby, providing a fine tuning
capability to the host. For each SCK clock pulse (t

HIGH

)

while SI is HIGH, the selected wiper will move one
resistor segment towards the V

terminal. Similarly,

for each SCK clock pulse while SI is LOW, the selected
wiper will move one resistor segment towards the V

terminal. A detailed illustration of the sequence and
timing for this operation are shown in Figure 7 and Figure
8.

Pot Select

Select

Instructions

X9400

Characteristics subject to change without notice.

6 of 22

REV 1.1.6 1/30/03

www.xicor.com

Figure 4. Two-Byte Instruction Sequence

Figure 5. Three-Byte Instruction Sequence (Write)

Figure 6. Three-Byte Instruction Sequence (Read)

Figure 7. Increment/Decrement Instruction Sequence

P1 P0

SCK

A1 A0

I1 I0

R1 R0 P1 P0

SCK

D5 D4 D3 D2

D1 D0

A1 A0

I1 I0

R1 R0 P1 P0

SCK

D5 D4 D3 D2

D1 D0

Don't Care

A1 A0

SCK

D
E

X9400

Characteristics subject to change without notice.

7 of 22

REV 1.1.6 1/30/03

www.xicor.com

Figure 8. Increment/Decrement Timing Limits

Table 1. Instruction Set

Instruction

Instruction Set

Operation

Read Wiper Counter Register

Read the contents of the Wiper Counter Register
pointed to by P

-P

Write Wiper Counter Register

Write new value to the Wiper Counter Register
pointed to by P

-P

Read Data Register

Read the contents of the Data Register pointed
to by P

-P

and R

Write Data Register

Write new value to the Data Register pointed to
by P

-P

and R

XFR Data Register to Wiper
Counter Register

Transfer the contents of the Data Register pointed
to by R

to the Wiper Counter Register pointed

to by P

-P

XFR Wiper Counter Register
to Data Register

Transfer the contents of the Wiper Counter
Register pointed to by P

-P

to the Register

pointed to by R

Global XFR Data Register to
Wiper Counter Register

Transfer the contents of the Data Registers
pointed to by R

of all four pots to their

respective Wiper Counter Register

Global XFR Wiper Counter
Register to Data Register

Transfer the contents of all Wiper Counter
Registers to their respective data Registers
pointed to by R

of all four pots

Increment/Decrement Wiper
Counter Register

Enable Increment/decrement of the Wiper
Counter Register pointed to by P

-P

Read Status (WIP bit)

Read the status of the internal write cycle, by
checking the WIP bit.

SCK

INC/DEC CMD Issued

WRID

Voltage Out

X9400

Characteristics subject to change without notice.

8 of 22

REV 1.1.6 1/30/03

www.xicor.com

Instruction Format

Notes: (1) "A1 ~ A0": stands for the device addresses sent by the master.

(2) WPx refers to wiper position data in the Counter Register
(3) "I": stands for the increment operation, SI held HIGH during active SCK phase (high).
(4) "D": stands for the decrement operation, SI held LOW during active SCK phase (high).

Read Wiper Counter Register (WCR)

Write Wiper Counter Register (WCR)

Read Data Register (DR)

Write Data Register (DR)

Transfer Data Register (DR) to Wiper Counter Register (WCR)

Transfer Wiper Counter Register (WCR) to Data Register (DR)

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

WCR

addresses

wiper position

(sent by X9400 on SO)

Rising

Edge

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

WCR

addresses

Data Byte

(sent by Host on SI)

Rising

Edge

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

DR and WCR

addresses

Data Byte

(sent by X9400 on SO)

Rising

Edge

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

DR and WCR

addresses

Data Byte

(sent by host on SI)

Rising

Edge

HIGH-VOLTAGE

WRITE CYCLE

0 1 0 1 0 0

1 1 0 0

0 0

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

DR and WCR

addresses

Rising

Edge

0 1 0 1 0 0

1 1 0 1

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

DR and WCR

addresses

Rising

Edge

HIGH-VOLTAGE

WRITE CYCLE

0 1 0 1 0 0

1 1 1 0

X9400

Characteristics subject to change without notice.

9 of 22

REV 1.1.6 1/30/03

www.xicor.com

Increment/Decrement Wiper Counter Register (WCR)

Global Transfer Data Register (DR) to Wiper Counter Register (WCR)

Global Transfer Wiper Counter Register (WCR) to Data Register (DR)

Read Status

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

WCR

addresses

increment/decrement

(sent by master on SDA)

Rising

Edge

X X

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

addresses

Rising

Edge

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

addresses

Rising

Edge

HIGH-VOLTAGE

WRITE CYCLE

0 1 0 1 0 0

1 0 0 0

0 0

Falling

Edge

device type

identifier

device

addresses

instruction

opcode

wiper

addresses

Data Byte

(sent by X9400 on SO)

Rising

Edge

X9400

Characteristics subject to change without notice.

10 of 22

REV 1.1.6 1/30/03

www.xicor.com

ABSOLUTE MAXIMUM RATINGS

Temperature under bias.................... 65

°C to +135°C

Storage temperature......................... 65

°C to +150°C

Voltage on SCK, SCL or any address

input with respect to V

........................ 1V to +7V

Voltage on V+ (referenced to V

) .........................10V

Voltage on V- (referenced to V

) ........................ -10V

(V+) (V-) ..............................................................12V
Any V

.....................................................................V+

Any V

......................................................................V-

Lead temperature (soldering, 10 seconds) ........ 300

°C

(10 seconds) ................................................±12mA

COMMENT

Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device.
This is a stress rating only; 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.

RECOMMENDED OPERATING CONDITIONS

Temperature

Min.

Max.

Commercial

°C

+70

°C

Industrial

°C

+85

°C

Device

Supply Voltage (V

) Limits

X9400

±10%

X9400-2.7

2.7V to 5.5V

ANALOG CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)

Notes: (1) Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when

used as a potentiometer.

(2) Relative linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a

potentiometer. It is a measure of the error in step size.

(3) MI = RTOT/63 or (R

)/63, single pot

Symbol

Parameter

Limits

Test Conditions

Min.

Typ.

Max.

Unit

TOTAL

End to end resistance

±20

Power rating

°C, each pot

Wiper current

±6

Wiper resistance

150

250

Wiper Current =

± 1mA,

= 3V

100

Wiper Current =

± 1mA,

= 5V

Vv+

Voltage on V+ Pin

X9400

+4.5

+5.5

X9400-2.7

+2.7

+5.5

Vv-

Voltage on V- Pin

X9400

-5.5

-4.5

X9400-2.7

-5.5

-2.7

TERM

Voltage on any V

or V

V-

V+

Noise

-120

dBV

Ref: 1kHz

Resolution

1.6

Absolute linearity

(1)

-1

(3)

w(n)(actual)

w(n)(expected)

Relative linearity

(2)

-0.2

+0.2

(3)

w(n + 1)

w(n) + MI

]

Temperature coefficient of R

TOTAL

±300

ppm/

°C

Ratiometric temp. coefficient

±20

ppm/°C

Potentiometer capacitances

10/10/25

See Spice Macromodel

, R

leakage current

0.1

µA

= V

to V

. Device is in

stand-by mode.

X9400

Characteristics subject to change without notice.

11 of 22

REV 1.1.6 1/30/03

www.xicor.com

D.C. OPERATING CHARACTERISTICS (Over the recommended operating conditions unless otherwise specified.)

ENDURANCE AND DATA RETENTION

CAPACITANCE

POWER-UP TIMING

Symbol

Parameter

Limits

Test Conditions

Min.

Typ.

Max.

Units

CC1

supply current (Active)

400

µA

SCK

= 2MHz, SO = Open,

Other Inputs = V

CC2

supply current (Nonvol-

atile Write)

SCK

= 2MHz, SO = Open,

Other Inputs = V

current (standby)

µA

SCK = SI = V

, Addr. = V

Input leakage current

µA

= V

to V

Output leakage current

µA

OUT

= V

to V

Input HIGH voltage

x 0.7

+ 0.5

Input LOW voltage

0.5

x 0.1

Output LOW voltage

0.4

= 3mA

Parameter

Min.

Unit

Minimum endurance

100,000

Data changes per bit per register

Data retention

100

years

Symbol

Test

Max.

Unit

Test Conditions

OUT

(4)

Output capacitance (SO)

OUT

= 0V

(4)

Input capacitance (A0, A1, SI, and SCK)

= 0V

Symbol

Parameter Min.

Max.

Unit

PUR

(5)

Power-up to initiation of read operation

PUW

(5)

Power-up to initiation of write operation

(4)

Power up ramp

0.2

V/msec

POWER UP REQUIREMENTS (Power Up sequencing
can affect correct recall of the wiper registers)

The preferred power-on sequence is as follows: First
V

, then the potentiometer pins, R

, R

, and R

Voltage should not be applied to the potentiometer pins
before V+ or V- is applied. The V

ramp rate specifi-

cation should be met, and any glitches or slope
changes in the V

line should be held to <100mV if

possible. If V

powers down, it should be held below

0.1V for more than 1 second before powering up again
in order for proper wiper register recall. Also, V

should not reverse polarity by more than 0.5V. Recall of
wiper position will not be complete until V

, V+ and V-

reach their final value.

EQUIVALENT A.C. LOAD CIRCUIT

1533

100pF

SDA Output

X9400

Characteristics subject to change without notice.

12 of 22

REV 1.1.6 1/30/03

www.xicor.com

A.C. TEST CONDITIONS

Notes: (4) This parameter is periodically sampled and not 100% tested

(5) t

PUR

and t

PUW

are the delays required from the time the

third (last) power supply (V

, V+ or V-) is stable until the

specific instruction can be issued. These parameters are
periodically sampled and not 100% tested.

SPICE Macro Model

SYMBOL TABLE

nput pulse levels

x 0.1 to V

x 0.9

Input rise and fall times

10ns

Input and output timing level

x 0.5

10pF

TOTAL

25pF

10pF

WAVEFORM

INPUTS

OUTPUTS

Must be
steady

Will be
steady

May change
from Low to
High

Will change
from Low to
High

May change
from High to
Low

Will change
from High to
Low

Don't Care:
Changes
Allowed

Changing:
State Not
Known

N/A

Center Line
is High
Impedance

AC TIMING

Symbol

Parameter

Min.

Max.

Unit

SCK

SSI/SPI clock frequency

2.0

MHz

CYC

SSI/SPI clock cycle time

500

SSI/SPI clock high time

200

SSI/SPI clock low time

200

LEAD

Lead time

250

LAG

Lag time

250

SI, SCK, HOLD and CS input setup time

SI, SCK, HOLD and CS input hold time

SI, SCK, HOLD and CS input rise time

µs

SI, SCK, HOLD and CS input fall time

µs

DIS

SO output disable time

500

SO output valid time

100

SO output hold time

SO output rise time

SO output fall time

HOLD

HOLD time

400

HSU

HOLD setup time

100

HOLD hold time

100

HOLD low to output in High Z

100

HOLD high to output in Low Z

100

Noise suppression time constant at SI, SCK, HOLD and CS inputs

CS deselect time

µs

WPASU

WP, A0 and A1 setup time

WPAH

WP, A0 and A1 hold time

X9400

Characteristics subject to change without notice.

13 of 22

REV 1.1.6 1/30/03

www.xicor.com

HIGH-VOLTAGE WRITE CYCLE TIMING

XDCP TIMING

TIMING DIAGRAMS

Input Timing

Output Timing

Symbol

Parameter

Typ.

Max.

Unit

High-voltage write cycle time (store instructions)

Symbol

Parameter

Min. Max.

Unit

WRPO

Wiper response time after the third (last) power supply is stable

µs

WRL

Wiper response time after instruction issued (all load instructions)

µs

WRID

Wiper response time from an active SCL/SCK edge (increment/decrement instruction)

450

...

SCK

MSB

LSB

High Impedance

LEAD

LAG

CYC

...

SCK

ADDR

MSB

LSB

DIS

...

X9400

Characteristics subject to change without notice.

16 of 22

REV 1.1.6 1/30/03

www.xicor.com

APPLICATIONS INFORMATION

Basic Configurations of Electronic Potentiometers

Application Circuits

Three terminal Potentiometer;
Variable voltage divider

Two terminal Variable Resistor;
Variable current

Noninverting Amplifier

Voltage Regulator

Offset Voltage Adjustment

Comparator with Hysteresis

= (1+R

adj

(REG) = 1.25V (1+R

)+I

adj

(REG)

317

= {R

/(R

)} V

(max)

= {R

/(R

)} V

(min)

100K

10K

-12V

+12V

TL072

}

X9400

Characteristics subject to change without notice.

17 of 22

REV 1.1.6 1/30/03

www.xicor.com

Application Circuits (continued)

Inverting Amplifier

Equivalent L-R Circuit

= R

+ s R

+ R

) C

= R

+ s Leq

+ R

) >> R

Function Generator

}

= G V

G = - R

}

frequency

, R

, C

amplitude

, R

Attenuator

Filter

= G V

-1/2

G +1/2

= 1 + R

fc = 1/(2pRC)

All R

= 10k

X9400

Characteristics subject to change without notice.

21 of 22

REV 1.1.6 1/30/03

www.xicor.com

PACKAGING INFORMATION

Package Dimensions

Symbol

Millimeters

Min

Nominal

Max

Package Width

2.595

2.625

2.655

Package Length

3.814

3.844

3.874

Package Height

0.644

0.677

0.710

Body Thickness

0.444

0.457

0.470

Ball Height

0.200

0.220

0.240

Ball Diameter

0.300

0.320

0.340

Ball Pitch Width

0.5

Ball Pitch Length

0.5

Ball to Edge Spacing Width

0.538

0.563

0.588

Ball to Edge Spacing Length

0.647

0.672

0.697

Ball Matrix

RL1

RW0

RW1

RL0

VSS

RH1

RH0

VCC

V-

RH2

RH3

V+

RW2

HOLD

RL3

RL2

SCK

RW3

9400WRR

YWW I2.7

T #

24-Bump Chip Scale Package (CSP B24)
Package Outline Drawing

Top View (Sample Marking)

Bottom View (Bumped Side)

Side View

X9400

Characteristics subject to change without notice.

22 of 22

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, or licenses are implied.

TRADEMARK DISCLAIMER:

Xicor and the Xicor logo are registered trademarks of Xicor, Inc. AutoStore, Direct Write, Block Lock, SerialFlash, MPS, and XDCP are also trademarks of Xicor, Inc. All
others belong to their respective owners.

U.S. PATENTS

Xicor products are covered by one or more of the following U.S. Patents: 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; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084,667; 5,153,880; 5,153,691;
5,161,137; 5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. 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 occurrence.

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.

REV 1.1.6 1/30/03

www.xicor.com

Ordering Information

Device

Limits

Blank = 5V

±10%

2.7 = 2.7 to 5.5V

Temperature Range
Blank = Commercial = 0

°C to +70°C

I = Industrial = 40

°C to +85°C

Package
S24 = 24-Lead SOIC
V24 = 24-Lead TSSOP
B24 = 24-Lead CSP
(production quantity sold in tape and reel)

Potentiometer Organization

Pot 0

Pot 1

Pot 2

Pot 3

W =

10K

10K 10K 10K

Y =

2.5K

2.5K 2.5K 2.5K

X9400

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: X9400-2.7

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: X9400-2.7