参数资料
型号: ST72324K2T6/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32
封装: TQFP-32
文件页数: 40/161页
文件大小: 2070K
代理商: ST72324K2T6/XXX
ST72324
134/161
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 76 is implemented to protect the
device against ESD.
Figure 74. Positive Stress on a True Open Drain Pad vs. VSS
Figure 75. Negative Stress on a True Open Drain Pad vs. VDD
Figure 76. 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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