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PDF STM6321 Data sheet ( Hoja de datos )
| Número de pieza | STM6321 | |
| Descripción | (STM6xxx) 5-Pin Supervisor with Watchdog Timer and Push-button Reset | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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STM6321/6322
STM6821/6822/6823/6824/6825
5-Pin Supervisor with
Watchdog Timer and Push-button Reset
FEATURES SUMMARY
■ PRECISION VCC MONITORING OF 5V, 3.3V,
3V, OR 2.5V POWER SUPPLIES
– STM6xxxL
– STM6xxxM
– STM6xxxT
– STM6xxxS
– STM6xxxR
– STM6xxxZ
■ RST OUTPUTS (ACTIVE-LOW, PUSH-PULL
OR OPEN DRAIN)
■ RST OUTPUTS (ACTIVE-HIGH, PUSH-
PULL)
■ 200ms (TYP) trec
■ WATCHDOG TIMER - 1.6sec (TYP)
■ MANUAL RESET INPUT (MR)
■ LOW SUPPLY CURRENT - 3µA (TYP)
■ GUARANTEED RST (RST) ASSERTION
DOWN TO VCC = 1.0V
■ OPERATING TEMPERATURE:
–40°C to 85°C (Industrial Grade)
Table 1. Device Options
Part Number Watchdog Input
STM6321
STM6322
STM6821
STM6822
STM6823
STM6824
STM6825
✔
✔
✔
✔
✔
Manual Reset
Input
✔
✔
✔
✔
✔
Figure 1. Package
SOT23-5 (WY)
Active-Low
(Push-pull)
✔
✔
✔
Reset Output
Active-High
(Push-pull)
✔
✔
✔
✔
✔
Active-Low
(Open Drain)
✔
✔
✔
June 2005
www.DataSheet4U.com
Rev 4
1/22
1 page  
STM6321/6322/6821/6822/6823/6824/6825
Pin Descriptions
Active-Low, Push-pull Reset Output (RST) -
STM6822/6823/6824/6825. Pulses low when trig-
gered, and stays low whenever VCC is below the
reset threshold or when MR is a logic low. It re-
mains low for trec after either VCC rises above the
reset threshold, the watchdog triggers a reset, or
MR goes from low to high.
Active-Low, Open Drain Reset Output (RST) -
STM6321/6322/6822. Pulses low when triggered,
and stays low whenever VCC is below the reset
threshold or when MR is a logic low. It remains low
for trec after either VCC rises above the reset
threshold, the watchdog triggers a reset, or MR
goes from low to high. Connect a pull-up resistor
to supply voltage.
Push-button Reset Input (MR). A logic low on
MR asserts the reset output. Reset remains as-
serted as long as MR is low and for trec after MR
returns high. This active-low input has an internal
52kΩ pull-up. It can be driven from a TTL or CMOS
logic line, or shorted to ground with a switch.
Leave open if unused.
Watchdog Input (WDI). If WDI remains high or
low for at least 1.6sec, the internal watchdog timer
expires and reset is asserted. The internal watch-
dog timer clears while reset is asserted or when
WDI sees a rising or falling edge. The watchdog
function CAN be disabled if WDI is left unconnect-
ed or is connected to a tri-state buffer output.
Active-High Reset Output. Active-high, push-
pull reset output; inverse of RST.
Table 3. Pin Functions
Pin
STM6822
STM6823
STM6821
STM6321
STM6824
1–1
33–
444
–13
555
222
STM6322
STM6825
1
4
–
3
5
2
Name
Function
RST
MR
WDI
RST
VCC
VSS
Active-Low Reset Output
Push-button Reset Input
Watchdog Input
Active-High Reset Output
Supply Voltage
Ground
Figure 6. Block Diagram (STM6xxx)
WDI(1)
VCC
WDI
Transitional
Detector
VCC
VRST
WATCHDOG
TIMER
COMPARE
MR(2)
Note: 1. For STM6321/6821/6822/6823/6824
2. For STM6322/6821/6822/6823/6825
3. For STM6821/ (RST output only)
4. For STM6321/6322/6824/6825 (both RST and RST outputs)
trec
Generator
RST (RST)(3)
RST(4)
AI09132
5/22
5 Page 
STM6321/6322/6821/6822/6823/6824/6825
Figure 16. Normalized Reset Threshold Voltage vs. Temperature
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
–40
–20
0 20 40
Temperature (˚C)
60 80
AI09631a
Figure 17. Normalized Power-up Watchdog Time-Out Period
1.05
1.04
1.03
1.02
1.01
1.00
0.99
–40
–20
0 20 40
Temperature (˚C)
60 80
AI09671
11/22
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet STM6321.PDF ] | |
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