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SS811-29CV Datasheet(PDF) 6 Page - Silicon Standard Corp. |
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SS811-29CV Datasheet(HTML) 6 Page - Silicon Standard Corp. |
6 / 8 page www.SiliconStandard.com 6 of 8 SS811, SS812 Rev.1.01 4/06/2004 BLOCK DIAGRAM RPULL_UP 20K R2 R1 MR GND RESET (RESET) Reset Generator - + Bandgap VCC PIN DESCRIPTIONS GND Pin : Ground. RESET Pin (SS811) : Active low output pin. RESET Output remains low while Vcc is below reset threshold. RESET Pin (SS812) : Active high output pin. RESET output remains high while Vcc is below reset threshold. MR Pin : Logic low manual reset input. This active-low input has an internal 20k Ω pull-up resistor. It can be driven by a TTL or CMOS, or shorted to ground with a switch. Leave open when unused. Vcc Pin : Supply voltage. DETAILED DESCRIPTIONS OF TECHNICAL TERMS RESET OUTPUT The microprocessor will be activated at a valid reset state. These µ P supervisory circuits assert reset to prevent code execution errors during power-up, power-down, or brownout conditions. RESET is guaranteed to be a logic low for VTH>VCC>0.9V. Once VCC exceeds the reset threshold, an internal timer keeps RESET low for the reset timeout period; after this interval, RESET goes high. If a brownout condition occurs (VCC drops below the reset threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and RESET goes low. The internal timer is activated after VCC returns above the reset threshold, and RESET remains low for the reset timeout period. The manual reset input (MR ) can also initiate a reset. The SS812 has an active-high RESET output that is the inverse of the SS811’s RESET output. |
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