DS1832S Datasheet, PDF (1/7 Pages) Maxim Integrated Products – 3.3-Volt MicroMonitor Chip

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DS1832
3.3-Volt MicroMonitor Chip
FEATURES
Halts and restarts an out-of-control
microprocessor
Holds microprocessor in check during power
transients
Automatically restarts microprocessor after
power failure
Monitors pushbutton for external override
Accurate 10% or 20% microprocessor power
monitoring
Eliminates need for discrete components
20% tolerance for use with 3.0-volt systems
Pin-compatible with the DS1232
Low cost 8-pin DIP, 8-pin SOIC, and space
saving µ-SOP packages available
Industrial temperature range of -40°C to
+85°C
PIN ASSIGNMENT
PBRST 1
8
VCC
TD 2
7 ST
TOL 3
6 RST
GND ⁴
5 RST
DS1832 8-Pin DIP (300-mil)
See Mech. Drawings Section
PBRST
18
VCC
TD
27
ST
TOL
36
RST
GND
45
RST
DS1832S 8-Pin SOIC (150-mil)
See Mech. Drawings Section
PBRST 1
TD 2
TOL 3
GND 4
8 VCC
7 ST
6 RST
5 RST
DS1832µ 8-Pin µ-SOP (118-mil)
See Mech. Drawings Section
PIN DESCRIPTION
PBRST
TD
TOL
GND
RST
- Pushbutton Reset Input
- Time Delay Set
- Selects 10% or 20% V_CC Detect
- Ground
- Active High Reset Output
RST
- Active Low Reset Output
ST
- Strobe Input
V_CC
- Power Supply
DESCRIPTION
The DS1832 3.3-Volt MicroMonitor monitors three vital conditions for a microprocessor: power supply,
software execution, and external override. First, a precision temperature-compensated reference and
comparator circuit monitor the status of V_CC. When an out-of-tolerance condition occurs, an internal
power-fail signal is generated which forces the resets to an active state. When V_CC returns to an
in-tolerance condition, the reset signals are kept in the active state for a minimum of 250 ms to allow the
power supply and processor to stabilize.
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