LC709004AMJ-AH 查看數據表（PDF） - ON Semiconductor

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LC709004AMJ-AH

I/O-Expander for Microcontroller

ON Semiconductor 

LC709004A

Example of Placing Bypass Capacitors between VDD and VSS Terminals

5.0V

C1

VDD

VDDP1

VSS LC709004

5.0V

C1

VDDP1

VDD

VSS LC709004

3.3V

C1

(a) The case of using single voltage

(VDD= VDDP1)

Fig. 7

(b) The case of using variable voltage

In the case of using single voltage source as showing in the Fig.7 (a), you must connect a bypass capacitor (C1, about

0.1μF) between VDD and VSS. When connecting the capacitor (C1) and VDD-VSS, use a thick wire, and try to make

its length as short as possible: moreover, try to make the impedance of VDD-C1 and VSS-C1 equal.

In addition, when using several voltage sources as showing in the Fig.7 (b), it is suggested to connect the bypass

capacitor to each set of the voltage terminals.

VDD

RRES Note 6:

The values of CRES and RRES must be determined so

that a reset period of 1μs or longer is set up after the

RES

operating voltage goes beyond its lower-limit value and

CRES

the reset can be released after the operating power

voltage is completely reached.

Fig. 8: Reset Circuit

No.A0165-11/13

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