STM6718 datasheet(8/30 Pages) STMICROELECTRONICS

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

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Doc ID 11469 Rev 8

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 6 µs 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 4.63 V to 1.58 V.

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 3.08 V to 0.79 V.

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 0.626 V (internal reference voltage at this comparator). The monitored voltage reset

threshold is set with an external resistor-divider network.

Table 3.

Pin functions

Name

Function

STM6717

STM6718

STM6719

STM6720

STM6777

STM6778

STM6779

STM6780

1111

RST

Active-low reset output

3333

Push-button reset input

—

MRC

Manual reset delay input

5666

VCC1 Primary supply voltage input

444

—

VCC2 Secondary supply voltage input

—

RSTIN Adjustable reset comparator input

2222

VSS

Ground

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