st72321j STMicroelectronics, st72321j Datasheet - Page 153

• Manufacturer Part Number: st72321j
• Description: 8-bit Mcu With Nested Interrupts, Flash, 10-bit Adc, 5 Timers, Spi, Sci, I2c Interface
• Manufacturer: STMicroelectronics

EMC CHARACTERISTICS (Cont’d)
12.7.4 ESD Pin Protection Strategy
To protect an integrated circuit against Electro-
Static Discharge the stress must be controlled to
prevent degradation or destruction of the circuit el-
ements. The stress generally affects the circuit el-
ements which are connected to the pads but can
also affect the internal devices when the supply
pads receive the stress. The elements to be pro-
tected must not receive excessive current, voltage
or heating within their structure.
An ESD network combines the different input and
output ESD protections. This network works, by al-
lowing safe discharge paths for the pins subjected
to ESD stress. Two critical ESD stress cases are
presented in
pins and in
drain pins.
Figure 82. Positive Stress on a Standard Pad vs. V
Figure 83. Negative Stress on a Standard Pad vs. V
Main path
Path to avoid
Main path
Figure 84
Figure 82
V
V
V
V
DD
DD
SS
SS
and
and
Figure 85
Figure 83
(3a)
(3b)
(3a)
(3b)
for true open
for standard
OUT
OUT
SS
Standard Pin Protection
To protect the output structure the following ele-
ments are added:
To protect the input structure the following ele-
ments are added:
DD
– A diode to V
– A protection device between V
– A resistor in series with the pad (1)
– A diode to V
– A protection device between V
(4)
(4)
IN
IN
DD
DD
(3a) and a diode from V
(2a) and a diode from V
(2a)
(2b)
(2a)
(2b)
(1)
(1)
DD
DD
and V
and V
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SS
SS
SS
SS
V
V
V
V
DD
SS
DD
SS
(3b)
(2b)
(4)
(4)