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參數(shù)資料
| 型號： | STM6719 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Dual/Triple Ultra-Low Voltage Supervisors with Push-Button Reset (with Delay Option) |
| 中文描述： | 雙/三超低電壓的推監(jiān)控，復(fù)位按鈕（帶有延遲期權(quán)） |
| 文件頁數(shù)： | 6/25頁 |
| 文件大小： | 129K |
| 代理商： | STM6719 |
STM6717/6718/6719/6720/6777/6778/6779*/6780*
6/25
Pin Descriptions
Active-Low, Push-pull Reset Output (RST) -
STM6718/20/78/80.
The RST pin is driven low
and stays low whenever V
CC1
or V
CC2
or RSTIN
falls below its factory-trimmed or adjustable reset
threshold or when MR goes to logic low. It remains
low for t
rec
after ALL supply voltages being moni-
tored rise above their reset thresholds and MR
goes from low to high. (Push-pull outputs are ref-
erenced to V
CC1
.)
Active-Low, Open Drain Reset Output (RST) -
STM6717/19/77/79.
The RST pin is driven low
and stays low whenever V
CC1
or V
CC2
or RSTIN
falls below its factory-trimmed or adjustable reset
threshold or when MR goes to logic low. It remains
low for t
rec
after ALL supply voltages being moni-
tored rise above their reset thresholds and MR
goes from low to high. Connect an external pull-up
resistor to V
CC1
. A 10k
pull-up resistor should be
sufficient for most applications.
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 t
rec
after MR returns
to high. This active-low input has an internal 50k
pull-up resistor to V
CC1
. It can be driven from a
TTL or CMOS logic line, or with open drain/collec-
tor outputs, or connected to V
SS
through a switch.
If unused, leave this pin open or connect it to V
CC1
.
Connect a normally open momentary switch from
MR to V
SS
; external debounce circuitry is not re-
quired. (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
SS
provides addi-
tional noise immunity.
Manual Reset Delay Input (MRC) - STM6777/78/
79/80).
This pin is either left open or connected to
V
SS
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 6μs or more (see
Table 7., page 19
).
Primary Supply Voltage Monitoring Input
(V
CC1
).
It also is the input for the primary reset
threshold monitor. Available fixed (customer-se-
lectable, factory-programmed) reset thresholds in-
clude 4.63V to 1.58V.
Secondary Supply Voltage Monitoring Input
(V
CC2
).
This function is available on the
STM6717/18/19/20/77/78. Fixed (customer-se-
lectable, factory-programmed) reset thresholds in-
clude 3.08V to 0.79V.
Adjustable Reset Comparator Input (RSTIN;
STM6719/20/79/80).
This is a high impedance in-
put. 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-di-
vider network.
Table 3. Pin Functions
Pin
Name
Function
STM6717
STM6718
STM6719
STM6720
STM6777
STM6778
STM6779
STM6780
1
1
1
1
RST
Active-low Reset Output
3
3
3
3
MR
Push-button Reset Input
–
–
5
4
MRC
Manual Reset Delay Input
5
6
6
6
V
CC1
Primary Supply Voltage Input
4
4
4
–
V
CC2
Secondary Supply Voltage Input
–
5
–
5
RSTIN
Adjustable Reset Comparator Input
2
2
2
2
V
SS
Ground
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| STM6719LTGWB6E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Dual/triple ultra-low voltage supervisors with push-button reset (with delay option) |
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