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STM6823RWY6E Datasheet(PDF) 8 Page - STMicroelectronics

Part # STM6823RWY6E
Description  5-Pin Supervisor with Watchdog Timer and Push-button Reset
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM6823RWY6E Datasheet(HTML) 8 Page - STMicroelectronics

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STM6321/6322/6821/6822/6823/6824/6825
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Ensuring a Valid Reset Output Down to
VCC =0V. The STM6xxx Supervisors are guaran-
teed to operate properly down to VCC = 1V. In ap-
plications that require valid reset levels down to
VCC = 0, a pull-down resistor to active-low outputs
(push/pull only, see Figure 9.) and a pull-up resis-
tor to active-high outputs (push/pull only, see Fig-
ure 10.) will ensure that the reset line is valid while
the reset output can no longer sink or source cur-
rent. This scheme does not work with the open
drain outputs of the STM6321/6322/6822.
The resistor value used is not critical, but it must
be large enough not to load the reset output when
VCC is above the reset threshold. For most appli-
cations, 100k
Ω is adequate.
Interfacing to Microprocessors with Bi-
directional Reset Pins
Microprocessors with bi-directional reset pins can
contend with the STM6321/6322/6821/6822/6823/
6824/6825 reset output. For example, if the reset
output is driven high and the microprocessor
wants to pull it low, signal contention will result. To
prevent this from occurring, connect a 4.7k
Ω resis-
tor between the reset output and the microproces-
sor’s reset I/O as in Figure 11..
Figure 9. Ensuring RST Valid to VCC = 0,
(Active-Low Push-pull Outputs)
Figure 10. Ensuring RST Valid to VCC = 0,
(Active-High, Push-pull Outputs)
Note: This configuration does not work on open drain outputs of the
STM6321/6322/6822.
Figure 11. Interfacing to Microprocessors with
Bi-directional Reset I/O
AI09138
STM6XXX
RST
GND
VCC
VCC
R1
AI09139
STM6XXX
RST
GND
VCC
VCC
R1
AI09135
STM6XXX
RST
GND
4.7k
VCC
Microprocessor
RST
Buffered Reset to other
System Components
GND
VCC


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