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MC145707DW Datasheet(PDF) 7 Page - Motorola, Inc |
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MC145707DW Datasheet(HTML) 7 Page - Motorola, Inc |
7 / 12 page MC145705 •MC145706•MC145707 MOTOROLA 7 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. 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 C2+ GND C2– VSS STB NC Rx1 Tx1 Rx2 Tx2 Rx3 Tx3 C1+ MMBZ15VDLT1 0.1 µF C1– VDD TxEN NC DO1 DI1 DO2 DI2 DO3 DI3 VCC |
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