MC145705 데이터 시트보기 (PDF) - Motorola => Freescale

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MC145705

5 Volt Only Driver/Receiver with an Integrated Standly Mode

Motorola => Freescale 

ESD PROTECTION

ESD protection on IC devices that have their pins accessi-

ble to the outside world is essential. High static voltages ap-

plied to the pins when someone touches them either directly

or indirectly can cause damage to gate oxides and transistor

junctions by coupling a portion of the energy from the I/O pin

to the power supply buses of the IC. This coupling will usually

occur through the internal ESD protection diodes which are

designed to do just that. The key to protecting the IC is to

shunt as much of the energy to ground as possible before it

enters the IC. The figure below shows a technique which will

clamp the ESD voltage at approximately ± 15 V using the

MMBZ15VDLT1. Any residual voltage which appears on the

supply pins is shunted to ground through the capacitors C1

and C2.

MMBZ15VDLT1

C2+ 1

GND 2

C2–

3

VSS 4

STB

5

NC

6

Rx1 7

24 C1+

VCC

23

22 C1–

21 VDD

20 TxEN

19 NC

18 DO1

0.1 µF

Tx1 8

17 DI1

Rx2 9

Tx2 10

16 DO2

15 DI2

Rx3 11

Tx3 12

14 DO3

13 DI3

MOTOROLA

MC145705•MC145706•MC145707

7

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