DS1232LP+ Maxim Integrated Products, DS1232LP+ Datasheet

IC MICRO MONITOR LOW POWER 8-DIP

DS1232LP+

Manufacturer Part Number
DS1232LP+
Description
IC MICRO MONITOR LOW POWER 8-DIP
Manufacturer
Maxim Integrated Products
Series
MicroMonitor™r
Type
Simple Reset/Power-On Resetr
Datasheet

Specifications of DS1232LP+

Number Of Voltages Monitored
1
Output
Open Drain, Push-Pull
Reset
Active High/Active Low
Reset Timeout
Adjustable/Selectable
Voltage - Threshold
4.37V, 4.62V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Monitored Voltage
4.5 V to 5.5 V
Undervoltage Threshold
4.5 V or 4.25 V
Overvoltage Threshold
4.74 V or 4.49 V
Manual Reset
Resettable
Watchdog
Yes
Battery Backup Switching
No
Power-up Reset Delay (typ)
1000 ms
Supply Voltage (max)
5.5 V
Supply Voltage (min)
4.5 V
Supply Current (typ)
500 uA
Mounting Style
Through Hole
Maximum Operating Temperature
+ 70 C
Chip Enable Signals
No
Minimum Operating Temperature
0 C
Operating Supply Voltage
5 V
Output Type
Active High or Active Low or Open Drain
Power Fail Detection
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
DESCRIPTION
The DS1232 MicroMonitor™ Chip monitors three vital conditions for a microprocessor: power supply,
software execution, and external override. First, a precision temperature-compensated reference and
comparator circuit monitors the status of V
power fail signal is generated which forces reset to the active state. When V
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.
www.maxim-ic.com
MicroMonitor is a trademark of Dallas Semiconductor.
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 5% or 10% microprocessor power
supply monitoring
Eliminates the need for discrete components
Space-saving, 8-pin mini-DIP
Optional 16-pin SOIC surface mount package
Industrial temperature -40°C to +85°C
available, designated N
CC
. When an out-of-tolerance condition occurs, an internal
1 of 7
PIN ASSIGNMENT
PIN DESCRIPTION
TD
TOL
GND
RST
V
NC
ST
PBRST
RST
CC
DS1232S 16-Pin SOIC (300-mil)
PBRST
PBRST
DS1232 8-Pin DIP (300-mil)
See Mech. Drawings Section
See Mech. Drawings Section
GND
TOL
GND
TOL
NC
NC
NC
NC
TD
- Pushbutton Reset Input
- Time Delay Set
- Selects 5% or 10% V
- Ground
- Strobe Input
- +5 Volt Power
- No Connections
TD
- Reset Output (Active High)
- Reset Output (Active Low, open
MicroMonitor Chip
drain)
1
2
3
4
1
2
3
4
5
6
7
8
CC
returns to an in-tolerance
16
15
14
13
12
11
10
8
7
6
5
9
VCC
ST
RST
RST
NC
VCC
NC
ST
NC
RST
NC
RST
DS1232
CC
Detect
111899

Related parts for DS1232LP+

DS1232LP+ Summary of contents

Page 1

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 5% or 10% microprocessor power supply monitoring Eliminates the need for discrete components ...

Page 2

The second function the DS1232 performs is pushbutton reset control. The DS1232 debounces the pushbutton input and guarantees an active reset pulse width of 250 ms minimum. The third function is a watchdog timer. The DS1232 has an internal timer ...

Page 3

MICROMONITOR BLOCK DIAGRAM Figure 1 PUSHBUTTON RESET Figure 2 WATCHDOG TIMER Figure DS1232/DS1232S ...

Page 4

TIMING DIAGRAM: PUSHBUTTON RESET Figure 4 TIMING DIAGRAM: STROBE INPUT Figure 5 WATCHDOG TIMEOUTS Table 1 TD PIN GND Float V CC TIME-OUT MIN TYP 62.5 ms 150 ms 250 ms 600 ms 500 ms 1200 ...

Page 5

TIMING DIAGRAM: POWER-DOWN Figure 6 TIMING DIAGRAM: POWER-UP Figure DS1232/DS1232S ...

Page 6

ABSOLUTE MAXIMUM RATINGS* Voltage Pin Relative to Ground Voltage on I/O Relative to Ground Operating Temperature Operating Temperature (Industrial Version) Storage Temperature Soldering Temperature * This is a stress rating only and functional operation of the device ...

Page 7

AC ELECTRICAL CHARACTERISTICS PARAMETER = V PBRST IL RESET Active Time Pulse Width ST V Fail Detect to RST and RST CC V Slew Rate 4.75V to 4.25V CC V Detect to RST and RST CC V Slew Rate 4.25V ...

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