DS1232LPU+T&R Maxim Integrated Products, DS1232LPU+T&R Datasheet

IC MICRO MONITOR LP 8-USOP

DS1232LPU+T&R

Manufacturer Part Number
DS1232LPU+T&R
Description
IC MICRO MONITOR LP 8-USOP
Manufacturer
Maxim Integrated Products
Series
MicroMonitor™r
Type
Simple Reset/Power-On Resetr
Datasheet

Specifications of DS1232LPU+T&R

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
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
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
condition occurs, an internal power-fail signal is generated which forces reset to the active state. When
V
250 ms to allow the power supply and processor to stabilize.
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CC
Super-low power version of DS1232
50 A 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 -SOP
package available
Optional 16-pin SOIC package available
Industrial temperature -40°C to +85°C
available, designated N
returns to an in-tolerance condition, the reset signals are kept in the active state for a minimum of
1 of 7
Low Power MicroMonitor Chip
PIN ASSIGNMENT
PIN DESCRIPTION
TD
TOL
GND
RST
V
PBRST
ST
PBRST
RST
PBRST
CC
DS1232LP 8-Pin DIP (300-mil)
GND
DS1232LP (118-mil -SOP)
TOL
See Mech. Drawings Section
See Mech. Drawings Section
GND
TD
TOL
TD
1
2
3
4
1
2
3
4
8
7
6
5
8
7
6
5
- Pushbutton Reset Input
- Time Delay Set
- Selects 5% or 10% V
- Ground
- Reset Output (Active High)
- Reset Output (Active Low, open
- Strobe Input
- +5 Volt Power
drain)
V
ST
RST
RST
CC
CC
V
ST
RST
RST
CC
. When an out-of-tolerance
DS1232LP/LPS
PBRST
DS1232LPS 16-Pin SOIC (300-mil)
PBRST
DS1232LPS-2 8-Pin SOIC (150-mil)
GND
TOL
GND
NC
NC
NC
NC
TD
TOL
See Mech. Drawings Section
See Mech. Drawings Section
TD
1
2
3
4
5
6
7
8
1
2
3
4
CC
16
15
14
13
12
11
10
8
7
6
5
9
Detect
111899
VCC
ST
RST
RST
NC
VCC
NC
ST
NC
RST
NC
RST

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DS1232LPU+T&R Summary of contents

Page 1

FEATURES Super-low power version of DS1232 50 A 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 ...

Page 2

The second function the DS1232LP/LPS performs is pushbutton reset control. The DS1232LP/LPS debounces the pushbutton input and guarantees an active reset pulse width of 250 ms minimum. The third function is a watchdog timer. The DS1232LP/LPS has an internal timer ...

Page 3

MICROMONITOR BLOCK DIAGRAM PUSHBUTTON RESET Figure 1 WATCHDOG TIMER Figure DS1232LP/LPS ...

Page 4

TIMING DIAGRAM: PUSHBUTTON RESET Figure 3 TIMING DIAGRAM: STROBE INPUT Figure 4 WATCHDOG TIME-OUTS Table 1 TD GND Float V CC TIME-OUT MIN TYP 62.5 ms 150 ms 250 ms 600 ms 500 ms 1200 DS1232LP/LPS ...

Page 5

TIMING DIAGRAM: POWER-DOWN Figure 5 TIMING DIAGRAM: POWER-UP Figure DS1232LP/LPS ...

Page 6

ABSOLUTE MAXIMUM RATINGS* Voltage on V Pin Relative to Ground CC 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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