DS1707/DS1708
DS1707/DS1708
3.3 and 5.0 Volt MicroMonitor
FEATURES
PIN ASSIGNMENT
PBRST
1
2
3
4
8
7
6
5
RST
RST
NC
NMI
•
Holds
sients
microprocessor in check during power tran-
restarts microprocessor after power
V
CC
GND
IN
•
Automatically
failure
•
Monitors pushbutton for external override
•
Accurate 5%, 10% or 20% resets for 3.3 systems and
5% or 10% resets for 5.0 volt systems
PBRST
V
CC
GND
IN
8–PIN DIP
(300 MIL)
1
2
3
4
8
7
6
5
RST
RST
NC
NMI
•
Eliminates the need for discrete components
•
20% tolerance compatible with 3.0 volt systems
•
Pin compatible with the MAXIM MAX707/MAX708 in
8–pin DIP and 8–pin SOIC packages
8–PIN SOIC
(150 MIL)
PBRST
V
CC
GND
IN
1
2
3
4
8
7
6
5
RST
RST
NC
NMI
•
8–pin DIP, 8–pin SOIC and 8–pin
µ–SOP
packages
available
•
Industrial temperature range –40°C to +85°C
8–PIN
µ–SOP
(118 MIL)
See Mech. Drawings
Section
DS1707 and DS1708_/R/S/T
PIN DESCRIPTION
PBRST
V
CC
GND
IN
NMI
NC
RST
RST
–
–
–
–
–
–
–
–
Pushbutton Reset Input
Power Supply
Ground
Input
Non–maskable Interrupt
No Connect
Active Low Reset Output
Active High Reset Output
DESCRIPTION
The DS1707/DS1708 3.3 or 5.0 Volt MicroMonitor moni-
tors three vital conditions for a microprocessor: power
supply, voltage sense, and external override. A preci-
sion temperature–compensated reference and
comparator circuit monitors the status of V
CC
at the
device and at an upstream point for maximum protec-
tion. When the sense input detects an out–of–tolerance
condition a non–maskable interrupt is generated. As
the voltage at the device degrades an internal power fail
signal is generated which forces the reset to an active
state. When V
CC
returns to an in–tolerance condition,
the reset signal is kept in the active state for a minimum
of 130 ms to allow the power supply and processor to
stabilize.
ECopyright
1995 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
010996 1/9
DALLAS [ DALLAS SEMICONDUCTOR ]
