STM6779 datasheet(7/29 Pages) STMICROELECTRONICS

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STM6717/6718/6719/6720/STM6777/6778/6779/6780

Description

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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 10kΩ 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 50kΩ 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

RST

VCC1

VCC2

VSS

AI10417

RST

VCC1

VCC2

VSS

AI10418

MRC

RST

VCC1

VCC2

VSS

AI10419

RSTIN

RST

VCC1

MRC

VSS

AI10420

RSTIN

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