stm6717tz STMicroelectronics, stm6717tz Datasheet - Page 8

• Manufacturer Part Number: stm6717tz
• Description: Dual/triple Ultra-low Voltage Supervisors With Push-button Reset With Delay Option
• Manufacturer: STMicroelectronics

1.1.4
1.1.5
1.1.6
1.1.7
8/29
V
or connected to V
Connect a normally open momentary switch from MR to V
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 V
Manual reset delay input (MRC) - STM6777/78/79/80)
This pin is either left open or connected to V
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
Primary supply voltage monitoring input (V
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.
Secondary supply voltage monitoring input (V
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.
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.
STM6717
STM6718
CC1
1
3
–
5
4
–
2
. It can be driven from a TTL or CMOS logic line, or with open drain/collector outputs,
STM6719
STM6720
Pin functions
1
3
–
6
4
5
2
SS
Pin
through a switch. If unused, leave this pin open or connect it to V
STM6777
STM6778
1
3
5
6
4
–
2
STM6779
STM6780
1
3
4
6
–
5
2
SS
SS
RSTIN Adjustable reset comparator input
Name
MRC
V
V
RST
V
provides additional noise immunity.
MR
CC1
CC2
via a capacitor. By selecting the appropriate
SS
Active-low reset output
Push-button reset input
Manual reset delay input
Primary supply voltage input
Secondary supply voltage input
Ground
CC1
SS
Table 7 on page
CC2
)
; external debounce circuitry is
)
Function
21).
CC1
.