HC230 ALTERA [Altera Corporation], HC230 Datasheet - Page 90

• Manufacturer Part Number: HC230
• Description: HardCopy II Device Family
• Manufacturer: ALTERA [Altera Corporation]

HardCopy Series Handbook, Volume 1
4–48
The dashed line (see
during a positive ESD zap.
Figure 4–4. ESD Protection During Positive Voltage Zap
When the I/O pin receives a negative ESD zap at the pin that is less than
-0.7 V (0.7 V is the voltage drop across a diode), the intrinsic
P-Substrate/N+ drain diode is forward biased. Hence, the discharge
ESD current path is from GND to the I/O pin, as shown in
Figure 4–5. ESD Protection During Negative Voltage Zap
Figure
4–4) shows the ESD current discharge path
Altera Corporation
September 2008
Figure
4–5.