19-5876; Rev 6/11
DS1804
Nonvolatile Trimmer Potentiometer
FEATURES
PIN ASSIGNMENT
Single 100-Position Taper Potentiometer
Nonvolatile (NV) On-Demand Wiper
Storage
Operates from 3V or 5V Supplies
Up/Down, Increment-Controlled Interface
Available in 8-Pin (300 mils) DIP, 8-Pin
(150 mils) SO, and 8-Pin (118 mils) µSOP
-40°C to +85°C Operating Temperature
Range
Standard Resistance Values:
– DS1804-010: 10kΩ
– DS1804-050: 50kΩ
– DS1804-100: 100kΩ
INC
1
8
VCC
U/D
2
7
CS
H
3
6
L
GND
4
5
W
DIP (300 mils)
SO (150 mils)
μSOP (118 mils)
PIN DESCRIPTION
H
L
W
VCC
CS
U/ D
INC
GND
-
High-Terminal of Potentiometer
Low-Terminal of Potentiometer
Wiper of Potentiometer
3V or 5V Power Supply
Chip Select
Up/Down Control
Increment/Decrement Wiper Control
Ground
DESCRIPTION
The DS1804 NV trimmer potentiometer is a nonvolatile digital potentiometer that has 100 positions. The
device provides an ideal method for low-cost trimming applications using a CPU or manual control input
with minimal external circuitry. Wiper position of the DS1804 can be stored in EEPROM memory on
demand. The device’s wiper position is manipulated by a three-terminal port that provides an increment/
decrement counter controlled interface. This port consists of the control inputs CS , INC , and U/ D . The
DS1804 is available in three resistor grades, which include a 10kΩ, 50kΩ, and 100kΩ. The device is
provided in an industrial temperature grade. Additionally, the DS1804 will operate from 3V or 5V
supplies and is ideal for portable application requirements. Three packaging options are available and
include the 8-pin (300 mils) DIP, 8-pin (150 mils) SO, and 8-pin (118 mils) μSOP.
1 of 10
DS1804
OPERATION
The DS1804 is a single nonvolatile potentiometer. The device has a total of 100 tap-points including the
L- and H- terminals. A total of 99 resistive segments exist between the L- and H- terminals. These tappoints are accessible to the W-terminal, whose position is controlled via a three-terminal control port. A
block diagram of the DS1804 is shown in Figure 1.
The three-terminal port of the DS1804 provides an increment/decrement interface which is activated via a
chip-select input. This interface consists of the input signals CS , INC , and U/ D . These input signals
control a 7-bit up/down counter. The output of the 7-bit up/down counter controls a 1 of 100 decoder to
select wiper position. Additionally, this interface provides for a wiper storage operation using the CS and
INC input control pins. The timing diagram for the three-terminal interface control is shown in Figure 2.
PIN DESCRIPTIONS
VCC - Power Supply. The DS1804 will support supply voltages ranging from +2.7V to +5.5V.
GND - Ground.
H - High-Terminal Potentiometer. This is the high terminal of the potentiometer. It is not required that
this terminal be connected to a potential greater than the L-terminal. Voltage applied to the H-terminal
cannot exceed the power-supply voltage, VCC, or go below ground.
L - Low-Terminal Potentiometer. This is the low terminal of the potentiometer. It is not required that this
terminal be connected to a potential less than the H-terminal. Voltage applied to the L-terminal cannot
exceed the power-supply voltage, VCC, or go below ground.
W - Wiper of the Potentiometer. This pin is the wiper of the potentiometer. Its position on the resistor
array is controlled by the three-terminal control port. Voltage applied to the wiper cannot exceed the
power-supply voltage, VCC, or go below ground.
CS - Chip Select. The CS input is used to activate the control port of the DS1804. This input is active
low. When in a high-state, activity on the INC and U/ D port pins will not affect or change wiper
position.
INC - Wiper Movement Control. This input provides for wiper position changes when the CS pin is low.
Wiper position changes of the W-terminal will occur one position per high-to-low transition of this input
signal. Position changes will not occur if the CS pin is in a high state.
U/ D - Up/Down Control. This input sets the direction of wiper movement. When in a high state and CS
is low, any high-to-low transition on INC will cause a one position movement of the wiper towards the
H-terminal. When in a low state and CS is low, any high-to-low transitions on INC will cause the
position of the wiper to move towards the L-terminal.
2 of 10
DS1804
DS1804 BLOCK DIAGRAM Figure 1
POWER-UP/POWER-DOWN CONDITIONS
On power-up, the DS1804 will load the value of EEPROM memory into the wiper position register (or 1
of 100 decoder). The value of this register can then be set to another wiper position if desired, by using
the three-terminal control port. On power-up, wiper position will be loaded within a maximum time
period of 500µs once the power-supply is stable. Additionally, the three-terminal interface port will be
active after 50ms.
On power-down, the wiper position register data will be lost. On the next device power-up, the value of
EEPROM memory will be loaded into the wiper position register.
On shipment from the factory, Maxim Integrated Products does not guarantee a specified EEPROM
memory value. This value should be set by the customer as needed.
NONVOLATILE WIPER STORAGE
Wiper position of the DS1804 can be stored using the INC and CS inputs. Storage of the wiper position
takes place whenever the CS input transitions from low-to-high while the INC is high. Once this
condition has occurred the value of the current wiper position will be written to EEPROM memory.
The DS1804 is specified to accept 50,000 writes to EEPROM over 0°C to 70ºC before a wear-out
condition. After wear-out the DS1804 will still function and wiper position can be changed during
powered conditions using the three-terminal control port. However, on power-up the wiper-position will
be indeterminate.
ONE-TIME PROGRAMMABILITY (OTP)
The DS1804 can be easily used as an OTP device. The user of the DS1804 can trim the desired value of
the wiper position and set this position for storage as described above. Any activity through the threeterminal port can then be prevented by connecting the CS input pin to VCC. Also, an OTP application
does not adversely affect the number of times EEPROM is written, since EEPROM will only be loaded
and not written during a power-up or power-down condition.
On power-up, the DS1804 will load the current value of EEPROM memory into the wiper position
register.
3 of 10
DS1804
ABSOLUTE MAXIMUM RATINGS
Voltage on Any Pin Relative to Ground
Operating Temperature Range
Storage Temperature Range
Lead Temperature (soldering, 10s)
Soldering Temperature (reflow)
-1.0V to +6.0V
-40°C to +85°C
-55°C to +125°C
+300°C
+260°C
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation
sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect
reliability.
RECOMMENDED DC OPERATING CONDITIONS
(TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Supply Voltage
VCC
+2.7
5.5
V
1
Input Logic 1
VIH
2.0
VCC + 0.3
V
1, 2
Input Logic 0
VIL
-0.3
V
1, 15
L, H, W
VGND - 0.2
+0.8
+0.6
VCC + 0.2
V
1, 3
UNITS
NOTES
400
µA
4
+1
µA
1000
Ω
1
mA
48
µA
µA
5
Resistor Inputs
DC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER
SYMBOL
MIN
TYP
MAX
Supply Current
ICC
Input Leakage
ILI
Wiper Resistance
RW
Wiper Current
IW
-1
400
Standby Current:
3V
5V
ISTBY
10
20
Wiper Load Time
tWLT
500
µs
6
tPU
50
ms
14
Power-Up Time
4 of 10
DS1804
ANALOG RESISTOR CHARACTERISTICS
(VCC = 2.7V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER
SYMBOL
MIN
TYP
-20
End-to-End Resistor Tolerance
MAX
UNITS
NOTES
+20
%
8
Absolute Linearity
±0.6
LSB
9
Relative Linearity
±0.25
LSB
10
MHz
11
-3dB Cutoff Frequency
fCUTOFF
Temperature Coefficient
750
ppm/°C
CAPACITANCE
(VCC = 2.7V to 5.5V, TA = +25°C, unless otherwise noted.)
PARAMETER
MAX
UNITS
NOTES
CIN
5
pF
12
COUT
7
pF
12
(VCC = 2.7V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
CS to INC Setup
tCI
50
ns
13
U/ D to INC Setup
tDI
100
ns
13
INC Low Period
tIL
50
ns
13
INC High Period
tIH
100
ns
13
INC inactive to CS Inactive
tIC
500
ns
13
CS Deselect Time
tCPH
100
ns
13
Wiper Change to INC Low
tIW
200
ns
13
INC Rise and Fall Times
tR, tF
500
µs
13
INC Low to CS Inactive
tIK
ns
16
ms
13, 17
Input Capacitance
Output Capacitance
SYMBOL
MIN
TYP
AC ELECTRICAL CHARACTERISTICS
Wiper Storage Time
50
tWST
10
5 of 10
DS1804
NOTES:
1) All voltages are referenced to ground.
2) Valid for VCC = 5V only.
3) Resistor input voltages cannot go below ground or exceed VCC by the amounts as shown in the table.
4) Maximum current specifications are based on the clock rate of INC input. This specification
represents the current required when changing the wiper position.
5) Standby current levels apply when all inputs are driven to appropriate supply levels. CS , INC , U/ D =
VCC.
6) Wiper load time is specified as the time required for the DS1804 to load the wiper position with the
contents of nonvolatile memory once VCC has reached a stable operating voltage equal to or greater
than 2.7V.
7) The DS1804 is available in three resistor values. These include the DS1804-010, 10kΩ; the DS1804050, 50kΩ; and the DS1804-100, 100kΩ.
8) Valid at TA = +25°C only.
9) Absolute linearity is used to compare measured wiper voltage versus expected wiper voltage as
determined by wiper position. The DS1804 is specified to provide an absolute linearity of ±0.60 LSB.
10) Relative linearity is used to determined the change in voltage between successive tap positions. The
DS1804 is specified to provide a relative linearity specification of ±0.25 LSB.
11) -3dB cutoff frequency characteristics for the DS1804 depend on potentiometer total resistance.
DS1804-010, 1MHz; DS1804-050, 200kHz; and DS1804-100, 100kHz.
12) Capacitance values apply at TA = +25°C.
13) See Figure 2.
14) Power-up time is specified as the time required before the three-terminal control becomes active after
a stable power supply level has been reached.
15) At VCC = 2.7V, VIL = 0.8V.
16) The INC low to CS inactive is specified to be 50ns minimum. This is the transition condition which
allows the DS1804 three-terminal port to become inactive without writing the EEPROM memory of
the part.
17) Wiper Storage Time, tWST, is the time require for the DS1804 to write EEPROM memory for storage
of a new wiper position. The maximum time required to accomplish this task is specified at 10ms.
6 of 10
DS1804
THREE-TERMINAL INTERFACE TIMING DIAGRAM Figure 2
ORDERING INFORMATION
PART
DS1804-010+
VERSION (kΩ)
10
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
8 DIP (300 mils)
DS1804-050+
50
-40°C to +85°C
8 DIP (300 mils)
DS1804-100+
100
-40°C to +85°C
8 DIP (300 mils)
DS1804Z-010+
10
-40°C to +85°C
8 SO (150 mils)
DS1804Z-050+
50
-40°C to +85°C
8 SO (150 mils)
DS1804Z-100+
100
-40°C to +85°C
8 SO (150 mils)
DS1804U-010+
10
-40°C to +85°C
8 µSOP (118 mils)
DS1804U-050+
50
-40°C to +85°C
8 µSOP (118 mils)
DS1804U-100+
100
-40°C to +85°C
8 µSOP (118 mils)
+Denotes a lead(Pb)/RoHS-compliant package.
7 of 10
DS1804
BRANDING INFORMATION Figure 3
Top Brand
Bottom Brand
8-pin
DIP
DS1804-nnn
yywwrv
###xx
cccccc
8-pin
SOIC
DS1804m
yywwrv
###xx
8-pin
uSOP
1804
rvnnn
cccccc
yyww
###xx
DS1804 Brand Codes
Description
Values
Code
010
050
100
10k ohm
50k ohm
100k ohm
Pot Size (SOIC)
X
L
C
10k ohm
50k ohm
100k ohm
yyww
Date Code. It identifies the year
and work week the device was
assembled
eg. 0035 is the 35th work week
of 2000
rv
Die Revision
Generally this is a letter followed
by a number (eg. B2)
###xx
Lot Code
cccccc
Country of Assembly
nnn
Pot Size (DIP/uSOP)
m
8 of 10
DS1804
PACKAGE INFORMATION
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages.
Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a
different suffix character, but the drawing pertains to the package regardless of RoHS status.
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND PATTERN NO.
8 DIP
P8+2
21-0043
—
8 SO
S8+2
21-0041
90-0096
8 µSOP
U8+3
21-0036
90-0092
9 of 10
DS1804
REVISION HISTORY
REVISION
DATE
DESCRIPTION
6/11
Removed the flip chip package option
Updated the soldering temperature information and added lead
temperature information in the Absolute Maximum Ratings section
Changed VIH(MAX) from VCC + 0.5V to VCC + 0.3V, changed VIL(MIN)
from -0.5V to -0.3V, changed the resistor inputs min from GND - 0.5V to
VGND - 0.2V and max from VCC + 0.5V to VCC + 0.2V in the
Recommended DC Operating Conditions table
Updated the Ordering Information table to include lead-free options
Added the Package Information table
PAGES
CHANGED
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4
4
7
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reserves the right to change the circuitry and specifications without notice at any time.
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