Difference between revisions of "Reset generator"

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(Replacement: Added a pin compatible replacement)
 
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The Mitsumi PST518B is a [[reset]] generator, it holds the NeoGeo in reset as long as the power supply is below 4.4V.
 
The Mitsumi PST518B is a [[reset]] generator, it holds the NeoGeo in reset as long as the power supply is below 4.4V.
  
It has an open-collector output tied to {{Sig|RST|RST|N}} (not RESET !), which is shared with the reset button on the AES. The signal goes to {{Chipname|NEO-B1}}.
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It has an open-collector output tied to the {{Sig|RST|RST}} line (not {{Sig|RESET|RESET}} !), which is shared with the reset button on the home system. The line goes to {{Chipname|NEO-B1}}.
  
 
Not to be confused with the [[watchdog]] reset.
 
Not to be confused with the [[watchdog]] reset.
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Datasheet: [[File:PST518B.pdf]].
 
Datasheet: [[File:PST518B.pdf]].
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==Replacement==
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Not pin-compatible: TL7757CL
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Pin-compatible: MCP120-450GI/TO
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[[Category:Chips]]
 
[[Category:Chips]]

Latest revision as of 22:07, 13 June 2020

PST518B in a CD1 system.

The Mitsumi PST518B is a reset generator, it holds the NeoGeo in reset as long as the power supply is below 4.4V.

It has an open-collector output tied to the RST line (not RESET !), which is shared with the reset button on the home system. The line goes to NEO-B1.

Not to be confused with the watchdog reset.

Internal schematic

Pst518b.png

Datasheet: File:PST518B.pdf.

Replacement

Not pin-compatible: TL7757CL

Pin-compatible: MCP120-450GI/TO