MITSUMI
System Reset (Built-in Watch Dog Timer) MM1099
System Reset (Built-in Watch Dog Timer)
Monolithic IC MM1099
Outline
The function of this IC series MM1099 is to accurately reset systems, a generating reset signal at the time of
instantaneous supply voltage off or lowering in varied CPU and other logic system.
Further, with the watch dog timer built-in it can diagnose the operation of the system, intermittently
generating reset pulses when they operate erroneously to prevent runaway.
Features
1.
2.
3.
4.
5.
Built-in watch dog timer
Low current consumption
130µA TYP.
Low operating threshold voltage
V
CC
=0.8V
Watch dog stop function (RCT terminal)
Long clock monitoring time
T
PR
(POWER ON) : T
WD
(clock monitoring)=1 : 1
6. Fewer outer components
Package
DIP-8B (MM1099AD, MM1099BD)
SOP-8C (MM1099AF, MM1099BF)
SIP-8A (MM1099AS, MM1099BS)
Applications
1. Reset circuit for microcomputers, CPU and MPU.
2. Reset circuit for logic circuitry.
3. Monitoring of microcomputer system, etc.
Pin Assignmemt
1
2
3
8
7
6
5
4
5
1
2
3
4
6
7
SOP-8C/DIP-8B
8
TC
N.C
CK
GND
V
CC
RCT
V
S
------------------------------
-----------------------------
1
2
3
4
1 2 3 4 5 6 7 8
SIP-8A
5
6
7
8
TC
N.C
CK
GND
V
CC
RCT
V
S
------------------------------
-----------------------------
RESET
RESET