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FEATURES
Single 100-Position Taper Potentiometer
Nonvolatile (NV) On-Demand Wiper
Storage
Operates f rom 3V o r 5V Supplies
Up/Down , In crement-Controlled Interface
Available in 8-Pin (300 mils) D IP, 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
PIN ASSIGNMENT
PIN DESCRIPTION
H - High-Terminal o f Pot ent io meter
L - Low-Ter minal of Potentiometer
W - Wiper of Pot ent iomet er
VCC - 3V or 5V Po wer Supply
CS
- Chip Sele c t
U/
D
- Up/Down Contro l
INC
- Increment / Decr ement Wip er Control
GND - Ground
DESCRIPTION
The DS1804 NV t r immer p ot ent io meter is a no nvo lat ile digita l pot entio meter t hat has 100 p os it io ns. T he
device pro vides an ideal method for lo w-cost t rimming applicat ions using a CPU o r manual control input
with minimal external circuitry. Wiper position of the DS1804 can be stored in EEPROM memory on
demand. The device’s wiper posit ion is manipulated by a three-ter mina l po rt t hat pro vide s an incr eme nt/
decre ment co unt er controlled inter face. T his port consists of the co ntro l 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 t he 8-pin (300 mils) DIP, 8-pin (150 mils) SO, and 8-pin (118 mils) μSOP.
DS1804
Nonvolatile Trimmer Potentiometer
19-5876; Rev 6/11
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)
DS1804
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OPERATION
The DS1804 is a single nonvo lat ile po tentiometer. The device has a tot al of 100 t ap-po int s inc lud in g t he
L- and H- t ermina ls. A t otal o f 99 resist ive segments exist between the L- and H- t erminals. These tap-
points are accessible to the W-terminal, whose position is controlled via a three-terminal control po rt. A
block diagram o f t he DS1804 is shown in Figure 1.
T he three -ter minal po rt of t he DS1804 pro vides an incre ment /decre ment inter face w hich is act ivated via a
chip-select input. This interface consists of the input signals
,
INC
, and U/
D
. These input signals
control a 7-bit up/down counter. The out put of the 7-bit up/do wn co unt er controls a 1 of 100 decoder to
select w iper pos ition. Additionally, this int erface pr ovides for a w iper st or age o peratio n us ing the
CS
and
INC
input c ont rol pin s . T he timin g diagra m fo r the t hree-t ermina l inter face contro l is shown in Fig ure 2.
PIN DESCRIPTIONS
VCC - Power Supply. T he DS1804 will suppor t supp ly volt ages ranging from +2. 7V to +5.5V.
GND - Ground.
H - High-Terminal Pot entio meter. This is t he high ter minal of the potentiometer. It is not required that
this terminal be connected to a potential greater than the L-terminal. Vo ltage applied to the H-terminal
cannot exceed the po wer-supply vo lt age, VCC, or go belo w ground.
L - Low-Terminal P ote ntiomete r. Th is 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 po wer-supply volt age, 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 volt age, VCC, or go below ground.
CS
- Chip Select. The
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
- Wip er Move ment C o nt ro l. T his inp u t p ro v ide s f o r w iper p o s itio n c ha ng e s w he n the
pin is low.
Wiper po sit ion c hanges o f t he W-t e rmin a l w il l o c c ur o ne pos it io n p er hig h-to-low tra n sition of th is input
signal. Posit ion changes wil l not o cc ur if the
pi n is in a high s tate .
U/
D
- U p/Do wn Co nt rol. T his input set s the d ire ct io n o f wiper mo ve me nt. Whe n in a hig h st at e a nd
is low, any high-to-lo w t r ans it io n o n
INC
will cause a one posit ion 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
positio n o f the wiper t o move tow ar ds the L-terminal.
DS1804
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DS1804 BLOCK DIAGRAM Figure 1
POWER-UP/POWER-DOWN CONDITIONS
On power-up, the DS1804 will lo ad the value o f EE PROM me mo r y int o t he wiper po sit ion r egister (o r 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
act ive aft er 50ms.
On power-down, the wiper position register data will be lost. On the next device power-up, t he value o f
EE P ROM me mo ry wi ll be loaded into t he wiper po sitio n register.
On shipment from the factory, Maxim Integrated Products does not guarantee a specified EEPROM
memo ry va lue. T h is value s ho uld be set by the customer as need ed.
NONVOLA TILE WIPER STORAG E
Wiper positio n o f the DS1804 can be sto red using t he
INC
and
input s. Storage of the wiper posit ion
takes place whenever the
CS
input transitions from low-to-high while the
INC
is high. Once this
co nd itio n has o ccur r ed the valu e of the curr ent wiper position will be writte n 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-p osit io n w ill
be indet erminate.
ONE-TIME PROGRAMMABILITY (OTP)
The DS1804 can be eas ily used as an OTP device. The user of the DS1804 can trim the desired value o f
the wiper posit ion and set this position for storage as described above. Any activity through the three-
terminal port can then be prevented by connecting the
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.
DS1804
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ABSOLUTE MAXIMUM RATINGS
Voltage on Any Pin R elative to Gro und -1.0V to +6.0V
Operating Temperature Range -40°C to +85°C
Stor ag e T emperat ur e Range -55°C to +125°C
Lead Temperatur e (soldering, 10s) +300°C
So lder ing Te mperat ure (reflow) +260°C
This is a stress rating onl y and functional operation of t he device at these or any other conditions above those indicated in the operation
sections of this specification is not implied. Exposur e to absolute maximum rating condi tions 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
Supp ly 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 +0.8
+0.6
V 1, 15
Res istor Inpu ts L, H, W VGND - 0.2 VCC + 0. 2 V 1, 3
DC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V to 5.5V, TA = -40°C to +85°C, unless otherw ise noted. )
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Supp ly Curr ent ICC 400 µA 4
Input Leakage ILI -1 +1 µA
Wiper Resistance RW 400 1000 Ω
Wiper Curr ent IW 1 mA
St andby Curr ent:
3V
5V ISTBY 10
20 48 µA
µA 5
Wipe r L oa d Time tWLT 500 µs 6
Power-Up Time tPU 50 ms 14
DS1804
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ANALOG RESISTOR CHARACTERISTICS
(VCC = 2.7V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
End-to-End Resistor To lerance -20 +20 % 8
Abso lute L inearit y ±0.6 LSB 9
Relat ive L inearity ±0.25 LSB 10
-3dB Cutoff Frequency fCUTOFF MHz 11
Temperature Coeffic ie nt 750 ppm/°C
CAPACITANCE
(VCC = 2.7V to 5.5V, TA = +25°C, unless otherwise noted.)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Input Capacitance CIN 5 pF 12
Output Capac itance COUT 7 pF 12
AC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
to
INC
Setup tCI 50 ns 13
U/
D
to
INC
Setup tDI 100 ns 13
INC
Low Pe riod tIL 50 ns 13
INC
High Period tIH 100 ns 13
INC
inactive to
Inactive tIC 500 ns 13
De s ele c t Time tCPH 100 ns 13
Wiper Cha nge to
INC
Low tIW 200 ns 13
INC
Rise and Fall Times tR, tF 500 µs 13
INC
Low to
CS
Inactive tIK 50 ns 16
Wiper Storage Tim e tWST 10 ms 13, 17
DS1804
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NOTES:
1) All vo ltages ar e r eferenced to ground.
2) V alid for VCC = 5V only.
3) Resisto r input volt ages cannot go below gro und or exceed VCC by the amounts a s shown in the ta ble.
4) Maximum current specifications are based on the clock rate of
INC
input. This specification
repr esent s the curr e nt r e quir ed when changing the wipe r posit ion.
5) Standby curre nt levels app ly when all inputs are driven to appropriate suppl y leve ls.
CS
,
INC
, U/
D
=
VCC.
6) Wiper load time is specified as the time required for the DS1804 to load the wiper posit ion with the
contents of nonvo latile memory once VCC has reached a stable operating voltage equal to or greater
than 2.7V.
7) The DS1804 is availab le in three resisto r values. These include the DS1804-010, 10kΩ; the DS180 4-
050, 50kΩ; and the DS1804-100, 100kΩ.
8) V alid a t TA = +25°C only.
9) Absolute linearity is used to compare measured wiper voltage versus expected wiper voltage as
deter mined by w iper pos ition. The DS1804 is speci fied 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 t o pro vide a relative linearity specificat io n 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) Capac it ance values app l y at TA = +25°C.
13) See Figure 2.
14) Power-up time is spec ified as t he t ime requ ired befo re t he three-t erminal contr ol beco mes active aft er
a stable power supply leve l has bee n reac hed.
15) At VCC = 2. 7V, VIL = 0.8V.
16) The
INC
low to
inac t ive is spe ci fied to be 5 0ns min imu m. This is t he t rans itio n co nd it io n w hic h
allows the DS1804 three-terminal port to become inact ive wit hout writing t he EEPROM me mo ry o f
t he part .
17) Wiper Sto rage Time, t WST, is the time require for the DS1804 to writ e EEPROM memor y for sto rage
o f a new wiper positio n. T he maximu m t ime requ ired t o accomplish this t ask is specified at 10ms.
DS1804
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THREE-TERMINAL INTERFACE TIMING DIAGRAM Figure 2
ORDERING INFORMATION
PART
VERSION (kΩ)
TEMP RANGE
PIN-PACKAGE
DS1804-010+ 10 -40°C to +85°C 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)
+Den otes a lea d (Pb)/RoHS-compliant package.
DS1804
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BRANDING INFORM ATION Figure 3
DS1804m
yywwrv
###xx
1804
rvnnn
Top Brand Bottom Brand
8-pin
DIP
8-pin
SOIC
8-pin
uSOP
cccccc
yyww
###xx
DS1804 Brand Codes
Code Description Values
nnn Pot Size (DIP/uSOP) 010 10k ohm
050 50k ohm
100 100k ohm
mPot Size (SOIC) X10k ohm
L50k ohm
C100k 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
cccccc
DS1804-nnn
yywwrv
###xx
DS1804
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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
di f fere nt suf fix charac ter, but the drawin g pert ains to t he p ackage regardles s of RoHS status.
PACKAGE TYPE PACK AG E CODE OU TLINE 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
DS1804
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Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim
reserves the right to change the circuitry and specifications without noti ce at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
REVISION HISTORY
REVISION
DATE DESCRIPTION PAGES
CHANGED
6/11
Removed the flip chip package option 1, 7
Updated the soldering temperature information and added lead
temperature information in the Absolute Maximum Ratings section 4
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
4
Updated the Ordering Information table to include lead-free options 7
Added the Package Information table 9