STM6780 STMicroelectronics, STM6780 Datasheet - Page 8

• Manufacturer Part Number: STM6780
• Description: Dual/triple ultra-low voltage supervisors with push-button reset (with delay option)
• Manufacturer: STMicroelectronics

Specifications of STM6780

• Primary Supply (vcc1) Monitor. Fixed (factory-programmed) Reset Thresholds: 4.63 V to 1.58 V
• Fixed (factory-programmed) Reset Thresholds: 3.08 V to 0.79 V
• Tertiary Supply Monitor (using Externally Adjustable Rstin): 0.626 V internal reference
• Reset Delay Time (trec) On Power-up: 13.2 ms, 210 ms, 900 ms (typ)
• Operating Temperature: –40 °C to 85 °C (industrial grade)

Description
1.1.4
1.1.5
1.1.6
1.1.7
8/30
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 6 µs 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 4.63 V to 1.58 V.
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 3.08 V to 0.79 V.
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.
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
Doc ID 11469 Rev 8
STM6779
STM6780
STM6717/6718/6719/6720/STM6777/6778/6779/6780
—
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
.