DS1708S Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS1708S Datasheet PDF : 9 Pages
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DS1707/DS1708
DS1707/DS1708
3.3 and 5.0 Volt MicroMonitor
FEATURES
• Holds microprocessor in check during power tran-
sients
• Automatically restarts microprocessor after power
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
• 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 DIP, 8–pin SOIC and 8–pin µ–SOP packages
available
• Industrial temperature range –40°C to +85°C
PIN ASSIGNMENT
PBRST
VCC
GND
IN
1
8
2
7
3
6
4
5
8–PIN DIP
(300 MIL)
RST
RST
NC
NMI
PBRST
VCC
GND
IN
1
8
2
7
3
6
4
5
8–PIN SOIC
(150 MIL)
RST
RST
NC
NMI
PBRST 1
VCC 2
GND 3
IN 4
8 RST
7 RST
6 NC
5 NMI
8–PIN µ–SOP
(118 MIL)
See Mech. Drawings
Section
DS1707 and DS1708_/R/S/T
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 VCC at the
device and at an upstream point for maximum protec-
tion. When the sense input detects an out–of–tolerance
PIN DESCRIPTION
PBRST
– Pushbutton Reset Input
VCC
GND
– Power Supply
– Ground
IN
– Input
NMI
– Non–maskable Interrupt
NC
– No Connect
RST
– Active Low Reset Output
RST
– Active High Reset Output
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 VCC 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
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