DS1231S-20+ Dallas Semiconductor, DS1231S-20+ Datasheet

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DS1231S-20+

Manufacturer Part Number
DS1231S-20+
Description
Power Monitor, 2.3-2.5 V Trip Point, SOIC-8
Manufacturer
Dallas Semiconductor
Type
Monitor Chipr
Datasheet

Specifications of DS1231S-20+

Current, Output
2 mA (High), 3 mA (Low)
Current, Supply
0.5 mA
Package Type
SOIC
Temperature, Operating, Range
0 to +70 °C
Time, Fall
300 μs
Voltage, Input
5 V
Voltage, Output, High
4.9 V
Voltage, Output, Low
0.4 V
Voltage, Supply
5 V
Lead Free Status / Rohs Status
RoHS Compliant part Electrostatic Device
Maxim
Description
With precise, temperature-compensated comparators, the DS1231 Power Monitor Chip monitors input power and a 5V system power supply. If unsafe
voltages are detected, a nonmaskable interrupt sends a warning signal to the processor in advance of power failure. Processing is unconditionally halted
when power falls below a user-selectable 5% or 10% threshold level, with time to shutdown proportional to the available hold-up time of the power supply.
Upon return of power, the DS1231 maintains reset until power conditions stabilize.
The DS1231 enhances system reliability by closely monitoring both processor and upstream power levels, warning of impending failure, and automatically
suspending and restarting processor operation. An input sense also supports a connection to switched inputs such as an opto-isolator for LED function. All
external reset components (i.e., pull-up resistor and delay timing capacitor) are contained in one package, saving space and cost.
Key Features
Key Specifications: Supervisors (1 Monitored Voltage)
Part Number
>
Monitors input and power supply and warns of impending failure
Provides orderly shutdown
Initiates and holds processor reset until levels are unsafe
Tolerance threshold levels can be set for 5% or 10%
Automatically restarts processor on power-up
Pauses restart until system stabilizes
Operating range: 0°C to +70°C (DS1231 and DS1231S)
-40°C to +85°C (DS1231-N and DS1231S-N)
Optional active-low NMI Hysteresis (200mV = "-20", 350mV = "-35", 500mV = "-50")
Products
Reset Threshold Range
>
[Supervisors, Voltage Monitors,
(V)
Reset Output
Active-Low
Sequencers]
Min. Reset Timeout
Range
DS1231
Power Monitor
Watchdog Feature Supervisor Features
Acc. (% @+25°C)
Reset Thresh.
Max. I
(µA)
CC

Related parts for DS1231S-20+

DS1231S-20+ Summary of contents

Page 1

... Tolerance threshold levels can be set for 5% or 10% Automatically restarts processor on power-up Pauses restart until system stabilizes Operating range: 0°C to +70°C (DS1231 and DS1231S) -40°C to +85°C (DS1231-N and DS1231S-N) Optional active-low NMI Hysteresis (200mV = "-20", 350mV = "-35", 500mV = "-50") ...

Page 2

... Application Notes Application Note 245: Adding Hysteresis to CPU Supervisor Voltage Sense Inputs Monitoring Upstream Voltage Supplies for Power-Fail Warnings DS1231 Application Note 3316: Dallas Semiconductor Microprocessor Supervisor Selection Guide Evaluation Kits none Reliability Reports Reliability Report: DS1231 ...

Page 3

DS1231 Notes DS1231-50+ DS1231-20N+ DS1231-35N+ DS1231-50N+ DS1231-35+ DS1231-20+ 200mV Hysteresis DS1231-50 500mV Hysteresis DS1231-20 200mV Hysteresis DS1231-35 350mV Hysteresis DS1231-50/G DS1231-35N 350mV Hysteresis DS1231-20N 200mV Hysteresis Free Buy TYPE PINS Package: Sample FOOTPRINT DRAWING CODE/VAR * PDIP;8 pin; Dwg: 21-0043 ...

Page 4

... DS1231-50N 500mV Hysteresis DS1231S-20+T&R DS1231S-35+ DS1231S-35N/T&R DS1231S-50N/T&R DS1231S-50N+ DS1231S-20N+ DS1231S-50+ DS1231S-500+T&R DS1231S-20+ DS1231S-20 200mV Hysteresis DS1231S-20/T&R 200mV Hysteresis PDIP;8 pin; -40°C to +85° Dwg: 21-0043 (PDF) C Use pkgcode/variation: P8-7* SOIC;16 pin; 0°C to +70°C Dwg: 21-0042 (PDF) Use pkgcode/variation: W16 +11* SOIC ...

Page 5

... DS1231S-35 350mV Hysteresis DS1231S-35/T&R 350mV Hysteresis DS1231S-50 500mV Hysteresis DS1231S-500/T&R DS1231S-20N 200mV Hysteresis DS1231S-50N 500mV Hysteresis SOIC;16 pin; 0°C to +70°C Dwg: 21-0042 (PDF) Use pkgcode/variation: W16-11* SOIC;16 pin; 0°C to +70°C Dwg: 21-0042 (PDF) Use pkgcode/variation: W16-11* SOIC;16 pin; 0°C to +70°C ...

Page 6

... NMI TOL 11 RST GND 8 RST DS1231S 16–Pin SOIC (300 MIL) See Mech. Drawings Section PIN DESCRIPTION IN – Input MODE – Selects input pin characteristics TOL – Selects 5% or 10% V detect CC GND – Ground RST – Reset (Active High) RST – Reset (Active Low, open drain) NMI – ...

Page 7

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 8

DS1231/S AC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL V to NMI Delay t TP IPD V Slew Rate 4.75-4.25V Detect to RST and RST t CC RPD V Detect to NMI t CC IPU V Detect to RST ...

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