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.
Features
♦
Three 20kΩ, 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
DS3904/DS3905
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 µSOP
10 µSOP
RESISTANCE
20kΩ + Hi-Z
20kΩ + Hi-Z
Applications
Power-Supply Calibration
Cell Phones and PDAs
Fibre Optic Transceiver Modules
Portable Electronics
Small and Low-Cost Replacement for
Conventional Mechanical Trimming Resistors/
Dip Switches
Test Equipment
DS3904U-020
DS3905U-020
Pin Configurations
TOP VEIW
SDA 1
SCL 2
V
CC
3
GND
4
8
7
A0
H0
H1
H2
A1 1
SDA 2
SDL 3
V
CC
GND
4
5
10 A2
9
A0
H0
H1
H2
DS3904
6
5
DS3905
8
7
6
µSOP
µSOP
Typical Operating Circuit
INTERFACE EXAMPLES
V
CC
V
CC
DS3904/DS3905
0.1µF
4.7kΩ
2-WIRE
MASTER
4.7kΩ
SCL
SDA
RESISTOR 1
20kΩ
ADDR F9h
RHIZ
H1
R
11
DIGITAL
LOGIC
2-WIRE
ADDRESSABLE
SWITCH (USING 00h
AND RHIZ SETTINGS)
V
CC
RESISTOR 0
20kΩ
ADDR F8h
RHIZ
H0
V
CC
R
10
VARIABLE RESISTANCE
FOR ADJUSTABLE
CURRENT SOURCE
A0
(DS3905 ONLY)
A1
A2
V
IN
RHIZ
H2
RESISTOR 2
20kΩ
ADDR FAh
GND
GAIN
CONTROL
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.
Triple 128-Position Nonvolatile
Variable Digital Resistor/Switch
DS3904/DS3905
ABSOLUTE MAXIMUM RATINGS
Voltage on V
CC
Pin Relative to Ground.................-0.5V to +6.0V
Voltage on SDA, SCL, A0, A1, A2
Relative to Ground*...................................-0.5V to V
CC
+ 0.5V
Voltage on H0, H1, and
H2 Relative to Ground .......................................-0.5V to +6.0V
Current Through H0, H1, and H2..........................................3mA
*This voltage must not exceed 6.0V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Operating Temperature Range ...........................-40°C to +85°C
Programming Temperature Range .........................0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature ................See J-STD-020A Specification
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