參數(shù)資料
型號: ST72F321J7T3
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP44
封裝: 10 X 10 MM, PLASTIC, TQFP-44
文件頁數(shù): 60/176頁
文件大?。?/td> 1112K
代理商: ST72F321J7T3
ST72321J
152/176
EMC CHARACTERISTICS (Cont’d)
True Open Drain Pin Protection
The centralized protection (4) is not involved in the
discharge of the ESD stresses applied to true
open drain pads due to the fact that a P-Buffer and
diode to VDD are not implemented. An additional
local protection between the pad and VSS (5a &
5b) is implemented to completely absorb the posi-
tive ESD discharge.
Multisupply Configuration
When several types of ground (VSS,VSSA, ...) and
power supply (VDD,VAREF, ...) are available for
any reason (better noise immunity...), the structure
shown in Figure 81 is implemented to protect the
device against ESD.
Figure 79. Positive Stress on a True Open Drain Pad vs. VSS
Figure 80. Negative Stress on a True Open Drain Pad vs. VDD
Figure 81. Multisupply Configuration
IN
VDD
VSS
(1)
(2b)
(4)
OUT
VDD
VSS
(3b)
Main path
Path to avoid
(5a)
(5b)
IN
VDD
VSS
(1)
(2b)
(4)
OUT
VDD
VSS
(3b)
Main path
(3b)
VAREF
VSSA
VAREF
VDD
VSS
BACK TO BACK DIODE
BETWEEN GROUNDS
VSSA
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