參數(shù)資料
型號(hào): DS1706T
英文描述: 3.3 and 5.0 Volt MicroMonitor
中文描述: 3.3和5.0伏特MicroMonitor
文件頁(yè)數(shù): 1/10頁(yè)
文件大?。?/td> 76K
代理商: DS1706T
AlCopyright 1995 by Dallas Semiconductor Corporation.
DS1705/DS1706
3.3 and 5.0 Volt MicroMonitor
DSDS1705/DS1706
011296 1/10
FEATURES
Halts and restarts an out–of–control microprocessor
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
3.3 volt 20% tolerance for use with 3.0 volt systems
Pin compatible with the MAXIM MAX705/MAX706 in
8–pin DIP and 8–pin SOIC
8–pin DIP, 8–pin SOIC and 8–pin
μ
–SOP packages
Industrial temperature range –40
°
C to +85
°
C
PIN ASSIGNMENT
WDS
RST (*RST)
ST
NMI
1
2
3
4
PBRST
V
CC
GND
IN
8
7
6
5
8
7
6
5
1
2
3
4
PBRST
V
CC
GND
IN
WDS
RST (*RST)
ST
NMI
8–PIN DIP
(300 MIL)
8(150 MIL)
1
2
3
4
8
7
6
5
PBRST
VCC
GND
IN
WDS
RST
ST
NMI
8–PIN
μ
–SOP
(118 MIL)
See Mech. Drawings
Section
DS1705 and DS1706_/R/S/T (*DS1706L and DS1706P)
PIN DESCRIPTION
PBRST
V
CC
GND
IN
NMI
ST
RST
*RST
– Pushbutton Reset Input
– Power Supply
– Ground
– Input
– Non–maskable Interrupt
– Strobe Input
– Active Low Reset Output
– Active High Reset Output
(DS1706P and DS1706L only)
– Watchdog Status Output
WDS
DESCRIPTION
The DS1705/DS1706 3.3 or 5.0 Volt MicroMonitor moni-
tors three vital conditions for a microprocessor: power
supply, software execution, and external override. A
precision 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.
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