STM818L/M STMicroelectronics, STM818L/M Datasheet - Page 8

• Manufacturer Part Number: STM818L/M
• Description: 5V Supervisor
• Manufacturer: STMicroelectronics

Specifications of STM818L/M

• Operating Temperature: –40 °C to +85 °C (industrial grade)

Description
1.1
1.1.1
1.1.2
1.1.3
1.1.4
8/43
Figure 5.
Figure 6.
Pin descriptions
MR
A logic low on MR asserts the reset output. Reset remains asserted as long as MR is low
and for t
driven from a TTL or CMOS logic line, or shorted to ground with a switch. Leave open if
unused.
WDI
If WDI remains high or low for 1.6 sec, the internal watchdog timer runs out and reset is
triggered. The internal watchdog timer clears while reset is asserted or when WDI sees a
rising or falling edge.
The watchdog function can be disabled by allowing the WDI pin to float.
RST
Pulses low for t
or when MR is a logic low. It remains low for t
threshold, the watchdog triggers a reset, or MR goes from low to high.
RST
Pulses high for t
threshold or when MR is a logic high. It remains high for t
reset threshold, the watchdog triggers a reset, or MR goes from high to low.
rec
after MR returns high. This active-low input has an internal pull-up. It can be
STM703/704/819 connections
STM818 connections
rec
rec
when triggered, and stays low whenever V
when triggered, and stays high whenever V
Doc ID 10522 Rev 10
V
V
V
V
OUT
V
OUT
V
PFI
CC
SS
CC
SS
E
SO8/TSSOP8
SO8/TSSOP8
1
2
3
4
1
2
3
4
STM690A/692A/703/704/802/805/817/818/819
rec
after either V
8
7
6
5
8
7
6
5
V
RST
WDI
E
V
RST
MR
PFO
BAT
CON
BAT
rec
CC
after either V
CC
CC
is below the reset threshold
rises above the reset
is above the reset
CC
falls below the
AI07890
AI07892