DS1232LP/LPS
Low Power MicroMonitor Chip
www.dalsemi.com
FEATURES
Super-low power version of DS1232
50
碌A(chǔ)
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
碌-SOP
package available
Optional 16-pin SOIC package available
Industrial temperature -40擄C to +85擄C
available, designated N
PIN ASSIGNMENT
PBRST
TD
TOL
GND
1
2
3
4
8
7
6
5
V
CC
ST
RST
RST
NC
PBRST
NC
TD
NC
TOL
DS1232LP 8-Pin DIP (300-mil)
See Mech. Drawings Section
NC
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
VCC
NC
ST
NC
RST
NC
RST
DS1232LPS 16-Pin SOIC (300-mil)
See Mech. Drawings Section
V
CC
ST
RST
RST
PBRST
TD
TOL
GND
1
2
3
4
8
7
6
5
PBRST
TD
TOL
GND
1
2
3
4
8
7
6
5
VCC
ST
RST
RST
DS1232LP碌 (118-mil
碌-SOP)
See Mech. Drawings Section
DS1232LPS-2 8-Pin SOIC (150-mil)
See Mech. Drawings Section
PIN DESCRIPTION
PBRST
TD
TOL
GND
RST
RST
ST
V
CC
- Pushbutton Reset Input
- Time Delay Set
- Selects 5% or 10% V
CC
Detect
- Ground
- Reset Output (Active High)
- Reset Output (Active Low, open
drain)
- Strobe Input
- +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.
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