X9408_14 Datasheet, PDF (13/20 Pages) Intersil Corporation – Quad Digitally Controlled Potentiometers

X9408
Power-up Requirements
(Power-up sequencing can affect correct recall of the wiper
registers).
The preferred power-on sequence is as follows: First V-,
then V_CC and V+, and then the potentiometer pins, V_H/R_H,
V_L/R_L, and V_W/R_W. Voltage should not be applied to the
potentiometer pins before V+ or V- is applied. The V_CC ramp
rate specification should be met, and any glitches or slope
changes in the V_CC line should be held to <100mV if
possible. If V_CC powers down, it should be held below 0.1V
for more than 1 second before powering up again in order for
proper wiper register recall. Also, V_CC should not reverse
polarity by more than 0.5V. Recall of wiper position will not
be complete until V_CC, V+ and V- reach their final value.
A.C. Test Conditions
Input pulse levels
Input rise and fall times
Input and output timing level
V_CC x 0.1 to V_CC x 0.9
10ns
V_CC x 0.5
Equivalent A.C. Load Circuit
5V
1533Ω
SDA OUTPUT
100PF
Circuit #3 SPICE Macro Model
V_H/R_H
R_TOTAL
C_H
C_W
V_L/R_L
C_L
10pF
10pF
25pF
V_W/R_W
13
FN8191.4
January 15, 2009