CAT5271ZI-00-GT3 ONSEMI [ON Semiconductor], CAT5271ZI-00-GT3 Datasheet - Page 8

• Manufacturer Part Number: CAT5271ZI-00-GT3
• Description: Dual 256-Position I2C Compatible Digital Potentiometer
• Manufacturer: ONSEMI [ON Semiconductor]

ESD Protection
Terminal Voltage Operating Range
limits for proper 3−terminal digital potentiometer operation.
Signals or potentials applied to terminals A, B or the wiper
must remain inside the span of V
which attempt to go outside these boundaries will be
clamped by the internal forward biased diodes.
The CAT5271 V
Digital
Input
W, A, B
Figure 12. ESD Protection Networks
W, A, B
LOGIC
GND
V
DD
DD
GND
GND
and GND power supply define the
Figure 13.
Potentiometer
LOGIC
DD
CAT5271
and GND. Signals
http://onsemi.com
8
Power−up Sequence
compliance at terminals A, B, and W (see Figure 12), it is
recommended that V
any voltage to terminals A, B, and W. The ideal power−up
sequence is: GND, V
order of powering V
important as long as they are powered after V
Power Supply Bypassing
length layout design. Leads should be as direct as possible.
It is also recommended to bypass the power supplies with
quality low ESR Ceramic chip capacitors of 0.01 mF to
0.1 mF. Low ESR 1 mF to 10 mF tantalum or electrolytic
capacitors can also be applied at the supplies to suppress
transient disturbances and low frequency ripple. As a further
precaution digital ground should be joined remotely to the
analog ground at one point to minimize the ground bounce.
Because ESD protection diodes limit the voltage
Good design practice employs compact, minimum lead
V
Figure 14. Power Supply Bypassing
DD
10 mF
C
3
A
DD
+
DD
, V
, digital inputs, and then V
/GND be powered before applying
B
, V
0.1 mF
W
C
, and the digital inputs is not
1
V
DD
CAT5271
GND
DD
A/B/W
/GND.
. The