Rev 1; 8/03
Triple 128-Position Nonvolatile Digital
Variable Resistor/Switch
General Description
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
鈾?/div>
Three 20k鈩? 128-Position Linear Digital Resistors
鈾?/div>
Resistor Settings are Stored in NV Memory
鈾?/div>
Each Resistor has a High-Impedance Setting for
Switch Operation to Control Digital Logic
鈾?/div>
Low Temperature Coefficient
鈾?/div>
2-Wire Serial Interface
鈾?/div>
2.7V to 5.5V Operating Range
鈾?/div>
-40擄C to +85擄C Industrial Temperature
鈾?/div>
Packaging: 8-Pin 碌SOP for DS3904, 10-pin 碌SOP
for DS3905
DS3904/DS3905
Ordering Information
PART
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-
PACKAGE
8 碌SOP
10 碌SOP
RESISTANCE
20k鈩?+ Hi-Z
20k鈩?+ 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
碌SOP
碌SOP
Typical Operating Circuit
INTERFACE EXAMPLES
V
CC
V
CC
DS3904/DS3905
0.1碌F
4.7k鈩?/div>
2-WIRE
MASTER
4.7k鈩?/div>
SCL
SDA
RESISTOR 1
20k鈩?/div>
ADDR F9h
RHIZ
H1
R
11
DIGITAL
LOGIC
2-WIRE
ADDRESSABLE
SWITCH (USING 00h
AND RHIZ SETTINGS)
V
CC
RESISTOR 0
20k鈩?/div>
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
20k鈩?/div>
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鈥檚 website at www.maxim-ic.com.
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