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STM6780MRWY6F Datasheet(PDF) 8 Page - STMicroelectronics |
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STM6780MRWY6F Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 29 page Description STM6717/6718/6719/6720/STM6777/6778/6779/6780 8/29 VCC1. It can be driven from a TTL or CMOS logic line, or with open drain/collector outputs, or connected to VSS through a switch. If unused, leave this pin open or connect it to VCC1. Connect a normally open momentary switch from MR to VSS; external debounce circuitry is not required. (If MR is driven from long cables or if the device is used in noisy environments, connecting a 0.1µF capacitor from MR to VSS provides additional noise immunity. 1.1.4 Manual reset delay input (MRC) - STM6777/78/79/80) This pin is either left open or connected to VSS via a capacitor. By selecting the appropriate capacitor, the manual reset process, initiated by pressing the push-button Manual Reset Input, can be delayed by any value from 6µs or more (see Table 7 on page 21). 1.1.5 Primary supply voltage monitoring input (VCC1) It also is the input for the primary reset threshold monitor. Available fixed (customer- selectable, factory-programmed) reset thresholds include 4.63V to 1.58V. 1.1.6 Secondary supply voltage monitoring input (VCC2) This function is available on the STM6717/18/19/20/77/78. Fixed (customer-selectable, factory-programmed) reset thresholds include 3.08V to 0.79V. 1.1.7 Adjustable reset comparator input (RSTIN; STM6719/20/79/80) This is a high impedance input. RST is driven low when the voltage at the RSTIN pin falls below 0.626V (internal reference voltage at this comparator). The monitored voltage reset threshold is set with an external resistor-divider network. Table 3. Pin functions Pin Name Function STM6717 STM6718 STM6719 STM6720 STM6777 STM6778 STM6779 STM6780 1111 RST Active-low reset output 3333 MR Push-button reset input ––54 MRC Manual reset delay input 5666 VCC1 Primary supply voltage input 444– VCC2 Secondary supply voltage input –5–5 RSTIN Adjustable reset comparator input 2222 VSS Ground |
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