MC145583DW Ver la hoja de datos (PDF) - Motorola => Freescale

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MC145583DW

3.3 Volt Only Driver/Receiver with an Integrated Standby Mode

Motorola => Freescale 

ESD PROTECTION

ESD protection on IC devices that have their pins acces-

sible to the outside world is essential. High static voltages

applied 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. Figure 1 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 x 8

C5+

C2+

GND

VCC

C5–

C2–

RIMON

C1+

VSS

C1–

STB

VDD

Rx1

DO1

Rx2

DO2

Rx3

DO3

Tx1

DI1

Rx4

DO4

Tx2

DI2

Rx5

DO5

Tx3

DI3

Figure 1. ESD Protection Scheme

0.1 µF

C1

0.1 µF

C2

MC145583

6

MOTOROLA

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