ASM813LCPA ALSC [Alliance Semiconductor Corporation], ASM813LCPA Datasheet - Page 3

• Manufacturer Part Number: ASM813LCPA
• Description: Low Power UP Supervisor Circuits
• Manufacturer: ALSC [Alliance Semiconductor Corporation]

Pin Description
rev 1.2
July 2004
DIP/
SO
1
2
3
4
5
6
7
8
-
-
ASM705/706
MicroSO
3
4
5
6
7
8
1
2
-
-
DIP/
SO
1
2
3
4
5
6
7
8
-
-
ASM707/708
Pin Number
Notice: The information in this document is subject to change without notice
MicroSO
3
4
5
6
7
8
1
2
-
-
Low Power µP Supervisor Circuits
DIP/
SO
1
2
3
4
5
6
8
7
-
-
ASM813L
MicroSO
3
4
5
6
7
8
2
1
-
-
RESET
RESET
Name
WDO
GND
PFO
WDI
V
MR
PFI
NC
CC
Manual reset input. The active LOW input triggers a reset
pulse. A 250 µA pull-up current allows the pin to be
driven by TTL/CMOS logic or shorted to ground with a
switch.
+5V power supply input.
Ground reference for all signals.
Power-fail input voltage monitor. With PFI less than
1.25V, PFO goes LOW. Connect PFI to Ground or V
when not in use.
Power-fail output. The output is active LOW and sinks
current when PFI is less than 1.25V.
Watchdog input. WDI controls the internal watchdog
timer. A HIGH or LOW signal for 1.6sec at WDI allows
the internal timer to run-out, setting WDO LOW. The
watchdog function is disabled by floating WDI or by con-
necting WDI to a high impedance three-state buffer. The
internal watchdog timer clears when: RESET is asserted;
WDI is three-stated ; or WDI sees a rising or falling edge.
Not Connected
Active LOW reset output. Pulses LOW for 200ms when
triggered, and stays LOW whenever V
reset threshold. RESET remains LOW for 200ms after
V
LOW to HIGH. A watchdog timeout will not trigger
RESET unless WDO is connected to MR.
Watchdog output. WDO goes LOW when the 1.6 second
internal watchdog timer times-out and does not go HIGH
until the watchdog is cleared. In addition, when V
below the reset threshold, WDO goes LOW. Unlike
RESET, WDO does not have a minimum pulse width and
as soon as V
HIGH with no delay.
Active HIGH reset output. The inverse of RESET. The
ASM813L has only a RESET output.
CC
ASM705 / 706 / 707 / 708
rises above the reset threshold or MR goes from
CC
exceeds the reset threshold, WDO goes
Function
ASM813L
CC
is below the
3 of 15
CC
CC
falls