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STM6720 数据表(PDF) 7 Page - STMicroelectronics |
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STM6720 数据表(HTML) 7 Page - STMicroelectronics |
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7 / 30 page ![]() STM6717/6718/6719/6720/STM6777/6778/6779/6780 Description Doc ID 11469 Rev 7 7/30 1.1 Pin descriptions 1.1.1 Active-low, push-pull reset output (RST) - STM6718/20/78/80 The RST pin is driven low and stays low whenever VCC1 or VCC2 or RSTIN falls below its factory-trimmed or adjustable reset threshold or when MR goes to logic low. It remains low for trec after ALL supply voltages being monitored rise above their reset thresholds and MR goes from low to high. (Push-pull outputs are referenced to VCC1.) 1.1.2 Active-low, open drain reset output (RST) - STM6717/19/77/79 The RST pin is driven low and stays low whenever VCC1 or VCC2 or RSTIN falls below its factory-trimmed or adjustable reset threshold or when MR goes to logic low. It remains low for trec after ALL supply voltages being monitored rise above their reset thresholds and MR goes from low to high. Connect an external pull-up resistor to VCC1. A 10 kΩ pull-up resistor should be sufficient for most applications. 1.1.3 Push-button reset input (MR) When MR goes low the RST output is driven low. RST remains low as long as MR is low and for trec after MR returns to high. This active-low input has an internal 50 kΩ pull-up resistor to Figure 5. STM6717/18 SOT23-5 connections Figure 6. STM6777/78 SOT23-6 connections Figure 7. STM6719/20 SOT23-6 connections Figure 8. STM6779/80 SOT23-6 connections 1 RST VCC1 VCC2 MR VSS AI10417 2 3 4 5 1 RST VCC1 VCC2 MR VSS AI10418 2 3 4 5 6 MRC 1 RST VCC1 VCC2 MR VSS AI10419 2 3 4 6 5 RSTIN 1 RST VCC1 MRC MR VSS AI10420 2 3 4 6 5 RSTIN |
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