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FMFFM1233AC Datasheet(PDF) 5 Page - Fairchild Semiconductor |
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FMFFM1233AC Datasheet(HTML) 5 Page - Fairchild Semiconductor |
5 / 7 page 5 www.fairchildsemi.com FM1233A Rev. E General Description The FM1233A features a highly accurate voltage reference to which VCC is compared. Once VCC is below the specified thresh- old, it will drive the RESET line and continue to hold it low until VCC returns above the threshold and the time for the RESET pulse duration has expired. The FM1233A is immune to short negative going transients on the VCC line. The placement of a 0.1µF bypass capacitor as close as possible to the VCC pin pro- vides additional transient immunity. For a VCC value below 1.0V, the FM1233A does not sink very much current on the RESET pin. This is not a problem in most systems since common devices are not functional in this range. If it is desired for the FM1233A reset to be functional below this range, use a 100K Ω pull-down resistor between RESET and VSS. Bi-Directional Reset The FM1233A permits a pushbutton (or a signal) to initiate a reset externally. Once this external reset is detected on the reset pin, FM1233 also actively asserts the reset signal to main- tain the Reset Timeout period when the external reset is not present . FM1233 internally debounces glitches seen during a typical push button closure. For proper operation, the external switch should be paralleled by an external capacitor of 100pF to 0.01µF. Connecting an External Reset to the FM1233A 1 FM1233 Controller 2 3 VCC GND 100pF PUSH BUTTON RESET |
Número de pieza similar - FMFFM1233AC |
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Descripción similar - FMFFM1233AC |
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