X9C303 Datasheet, PDF (2/10 Pages) Xicor Inc. – Digitally Controlled Potentiometer (XDCP)

X9C303
PIN DESCRIPTIONS
V_H and V_L
The high (V_H) and low (V_L) terminals of the device are
equivalent to the fixed terminals of a mechanical
potentiometer. The minimum voltage is –5V and the
maximum is +5V. It should be noted that the terminol-
ogy of V_L and V_H references the relative position of the
terminal in relation to wiper movement direction
selected by the U/D input and not the voltage potential
on the terminal.
V_W
V_W is the wiper terminal, equivalent to the movable
terminal of a mechanical potentiometer. The position
of the wiper within the array is determined by the con-
trol inputs. The wiper terminal series resistance is typi-
cally 40Ω.
Up/Down (U/D)
The U/D input controls the direction of the wiper
movement and whether the counter is incriminated or
decremented.
Increment (INC)
The INC input is negative-edge triggered. Toggling
INC will move the wiper and either increment or decre-
ment the counter in the direction indicated by the logic
level on the U/D input.
Chip Select (CS)
The device is selected when the CS input is LOW. The
current counter value is stored in nonvolatile memory
when CS is returned HIGH while the INC input is also
HIGH. After the store operation is complete the device
will be placed in the low power standby mode until the
device is selected once again.
PIN CONFIGURATION
PIN NAMES
Symbol
V_H
V_W
V_L
V_SS
V_CC
U/D
INC
CS
NC
Description
High Terminal (Potentiometer)
Wiper Terminal (Potentiometer)
Low Terminal (Potentiometer)
Ground
Supply Voltage
Up/Down Control Input
Increment Control Input
Chip Select Control Input
No Connection
POTENTIOMETER RELATIONSHIPS
V_H
(V_S) _R99
S100
S99
R98
S98
V_W
S3
R2
S2
R1
S1
V_L
Gi
=
20 L o g ^{R-----1-----+-----R----2-----+-----.----.---.---+-----R----i}
RTOTAL
=
V-----W----
VS
(
VL
=
0V)
R1 + R2 + . . . + R99 @ 3kΩ = RTOTAL
(Refer Test Circuit 1)
DIP/SOIC/(TSSOP)
(CS) INC
(V_CC) U/D
(INC) V_H
(U/D) _VSS
1
8
2
7
X9C303
3
6
4
5
V_CC ^(VL⁾
CS (V_W)
V_L (V_SS)
V_W ^(V_H⁾
2
FN8223.0
March 11, 2005