Rev 3; 3/07
Triple 128-Position Nonvolatile Digital
Variable Resistor/Switch
4/DS3905
General Description
Features
The DS3904/DS3905 contain three nonvolatile (NV) low
temperature coefficient, variable digital resistors. Each
resistor has 128 user-selectable positions. Additionally,
the DS3904/DS3905 have a high-impedance setting that
allows each resistor to function as a digital switch. The
DS3904/DS3905 can operate over a 2.7V to 5.5V supply
voltage range, and communication with the device is
achieved through a 2-wire serial interface. Address pins
allow multiple DS3904/DS3905s to operate on the same
two-wire bus. The DS3904 has one address pin, allow-
ing two DS3904s to share the bus, while the DS3905
has three address pins, allowing up to eight DS3905s to
share a common bus. The low-cost and small size of the
DS3904/DS3905 make them ideal replacements for con-
ventional mechanical trimming resistors.
♦ Three 20kΩ, or Two 20kΩ and One 10kΩ, 128-
Position Linear Digital Resistors
♦ Resistor Settings are Stored in NV Memory
♦ Each Resistor has a High-Impedance Setting for
Switch Operation to Control Digital Logic
♦ Low Temperature Coefficient
♦ 2-Wire Serial Interface
♦ 2.7V to 5.5V Operating Range
♦ -40°C to +85°C Industrial Temperature
♦ Packaging: 8-Pin µSOP for DS3904, 10-pin µSOP
for DS3905
Ordering Information
PIN-
(R0/R1/R2)
PART
TEMP RANGE
PACKAGE RESISTANCE (kꢀ)
Applications
DS3904U-010 -40°C to +85°C 8 μSOP
DS3904U-020 -40°C to +85°C 8 μSOP
DS3905U-020 -40°C to +85°C 10 μSOP
20/10/20 + High-Z
20/20/20 + High-Z
20/20/20 + High-Z
Power-Supply Calibration
Cell Phones and PDAs
Fibre Optic Transceiver Modules
Portable Electronics
Pin Configurations
TOP VEIW
Small and Low-Cost Replacement for
Conventional Mechanical Trimming Resistors/
Dip Switches
A1
1
2
3
4
5
10 A2
SDA
SCL
1
2
3
4
8
7
6
5
A0
H0
H1
H2
SDA
9
8
7
6
A0
H0
H1
H2
SDL
Test Equipment
DS3904
DS3905
V
CC
V
CC
GND
GND
μSOP
μSOP
Typical Operating Circuit
INTERFACE EXAMPLES
V
V
CC
V
CC
DS3904/DS3905
VARIABLE RESISTANCE
FOR ADJUSTABLE
CURRENT SOURCE
R
R
10
V
0.1μF
CC
RHIZ
RHIZ
H0
H1
RESISTOR 0
ADDR F8h
4.7kΩ 4.7kΩ
CC
SCL
SDA
2-WIRE
MASTER
11
DIGITAL
LOGIC
2-WIRE
ADDRESSABLE
SWITCH (USING 00h
AND RHIZ SETTINGS)
RESISTOR 1
ADDR F9h
A0
V
IN
A1
A2
(DS3905 ONLY)
RHIZ
GAIN
CONTROL
H2
RESISTOR 2
ADDR FAh
GND
R
12
_____________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.