Datasheet

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FEATURES
 Super-low power version of DS1232
 50 µA quiescent current
 Halts and restarts an out-of-control
microprocessor
 Automatically restarts microprocessor after
power failure
 Monitors pushbutton for external override
 Accurate 5% or 10% microprocessor power
supply monitoring
 8-pin DIP, 8-pin SOIC or space saving µ-SOP
package available
 Optional 16-pin SOIC package available
 Industrial temperature -40°C to +85°C
available, designated N
PIN ASSIGNMENT
PIN DESCRIPTION
PBRST - Pushbutton Reset Input
TD - Time Delay Set
TOL - Selects 5% or 10% V
CC
Detect
GND - Ground
RST - Reset Output (Active High)
RST - Reset Output (Active Low, open
drain)
ST - Strobe Input
V
CC
- +5 Volt Power
DESCRIPTION
The DS1232LP/LPS Low Power MicroMonitor Chip monitors three vital conditions for a
microprocessor: power supply, software execution, and external over-ride. First, a precision temperature-
compensated reference and comparator circuit monitors the status of V
CC
. When an out-of-tolerance
condition occurs, an internal power-fail signal is generated which forces reset to the 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.
DS1232LP/LPS
Low Power MicroMonitor Chip
www.dalsemi.com
DS1232LP 8-Pin DIP (300-mil)
See Mech. Drawings Section
PBRST
TD
TOL
GND
V
CC
ST
RST
1
2
3
4
8
7
6
5
RST
DS1232LPS 16-Pin SOIC (300-mil)
See Mech. Drawings Section
NC
PBRST
NC
TD
NC
TOL
NC
GND
NC
VCC
NC
ST
NC
RST
NC
RST
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
DS1232LP
µ
(118-mil
µ
-SOP)
See Mech. Drawings Section
PBRST
TD
TOL
GND
V
CC
ST
RST
RST
DS1232LPS-2 8-Pin SOIC (150-mil)
See Mech. Drawings Section
PBRST
TD
TOL
GND
VCC
ST
RST
1
2
3
4
8
7
6
5
RST
8
7
6
5
1
2
3
4