DS1804U-100 Maxim Integrated Products, DS1804U-100 Datasheet - Page 2

• Manufacturer Part Number: DS1804U-100
• Description: IC POT TRIMMER NV 100K 8-USOP
• Manufacturer: Maxim Integrated Products

Specifications of DS1804U-100

• Taps: 100
• Resistance (ohms): 100K
• Number Of Circuits: 1
• Temperature Coefficient: 750 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: Increment/Decrement
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Resistance In Ohms: 100K
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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 tap-
points 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
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
PIN DESCRIPTIONS
V
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, V
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, V
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, V
low. When in a high-state, activity on the
position.
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
U/
is low, any high-to-low transition on
H-terminal. When in a low state and
position of the wiper to move towards the L-terminal.
CS
INC
INC
CC
D
- Chip Select. The
- Power Supply. The DS1804 will support supply voltages ranging from +2.7V to +5.5V.
input control pins. The timing diagram for the three-terminal interface control is shown in Figure 2.
- Wiper Movement Control. This input provides for wiper position changes when the
- Up/Down Control. This input sets the direction of wiper movement. When in a high state and
CS
CC
, or go below ground.
input is used to activate the control port of the DS1804. This input is active
CC
, or go below ground.
INC
CS
CC
will cause a one position movement of the wiper towards the
CS
is low, any high-to-low transitions on
, or go below ground.
INC
pin is in a high state.
2 of 8
and U/
D
port pins will not affect or change wiper
CS
,
INC
, and U/
D
. These input signals
INC
will cause the
CS
pin is low.
CS
and
CS