DS1232S Maxim Integrated Products, DS1232S Datasheet

IC MICRO MONITOR 16-SOIC

DS1232S

Manufacturer Part Number
DS1232S
Description
IC MICRO MONITOR 16-SOIC
Manufacturer
Maxim Integrated Products
Series
MicroMonitor™r
Type
Simple Reset/Power-On Resetr
Datasheet

Specifications of DS1232S

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
16-SOIC (0.300", 7.5mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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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

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DS1232S Summary of contents

Page 1

... TOL GND DS1232 8-Pin DIP (300-mil) See Mech. Drawings Section NC PBRST TOL NC GND DS1232S 16-Pin SOIC (300-mil) See Mech. Drawings Section PIN DESCRIPTION - Pushbutton Reset Input PBRST TD - Time Delay Set TOL - Selects 5% or 10% V GND - Ground RST - Reset Output (Active High) ...

Page 2

... When TOL is connected falls below 4.5 volts. The RST and CC signals to the active state when the RST input pin prior to timeout, the watchdog timer is reset and ST input can be derived from microprocessor DS1232/DS1232S CC , the RST CC are excellent control RST . On CC RST input is not ST are inactive ...

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 DS1232/DS1232S MAX 250 ms 1000 ms 2000 ms ...

Page 5

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

Page 6

... IL (0°C to 70°C; V SYMBOL MIN TYP -0.5V -0. 4.50 4.62 CCTP V 4.25 4.37 CCTP SYMBOL MIN TYP OUT DS1232/DS1232S (0°C to 70°C) MAX UNITS NOTES =4.5 to 5.5V) CC MAX UNITS NOTES μ =25°C) A MAX UNITS ...

Page 7

... ST t RPD t 300 F t 250 Transition RPU RST PDLY with an internal impedance of 10k typical power-down until V CC drops below 2.0V DS1232/DS1232S =5V ± 10%) (0°C to 70° TYP MAX UNITS ms 610 1000 ms ns μs 100 175 μs 610 1000 ms μ drops below 2.0V. ...

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