MC145705 Motorola, MC145705 Datasheet - Page 7

• Manufacturer Part Number: MC145705
• Description: (MC145706 / MC145707) 5 Volt Only Driver/Receiver with an Integrated Standby Mode
• Manufacturer: Motorola

ESD PROTECTION
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
MOTOROLA
ESD protection on IC devices that have their pins accessi-
MMBZ15VDLT1
GND
V SS
STB
C2+
C2–
Rx1
Rx2
Rx3
Tx1
Tx2
Tx3
NC
1
2
3
4
5
6
7
8
9
10
11
12
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
MMBZ15VDLT1. Any residual voltage which appears on the
supply pins is shunted to ground through the capacitors C1
and C2.
24
23
22
21
20
19
18
17
16
15
14
13
MC145705 MC145706 MC145707
C1+
V CC
C1–
V DD
TxEN
NC
DO1
DI1
DO2
DI2
DO3
DI3
0.1 F
15 V using the
7