Product Summary

The DS1231S-20 Power Monitor Chip uses a precise temperature compensated reference circuit which provides an orderly shutdown and an automatic restart of a processor based system. A signal warning of an impending power failure is generated well before regulated DC voltages go out of specification by monitoring high voltage inputs to the power supply regulators. If line isolation is required a UL-approved opto-isolator can be directly interfaced to the DS1231S-20. The time for processor shutdown is directly proportional to the available hold-up time of the power supply. Just before the hold-up time is exhausted, the Power Monitor unconditionally halts the processor to prevent spurious cycles by enabling Reset as VCC falls below a selectable 5 or 10 percent threshold. When power returns, the processor is held inactive until well after power conditions have stabilized, safeguarding any nonvolatile memory in the system from inadvertent data changes.

Parametrics

DS1231S-20 absolute maximum ratings: (1)Voltage on VCC Pin Relative to Ground: -0.5V to +7.0V; (2)Voltage on I/O Relative to Ground: -0.5V to VCC + 0.5V; (3)Operating Temperature: 0℃ to 70℃; (4)Operating Temperature (Industrial Version): –40℃ to +85℃; (5)Storage Temperature: -55℃ to +125℃; (6)Soldering Temperature: 260℃ for 10 seconds.

Features

DS1231S-20 features: (1)Warns processor of an impending power failure; (2)Provides time for an orderly shutdown; (3)Prevents processor from destroying nonvolatile memory during power transients; (4)Automatically restarts processor after power is restored; (5)Suitable for linear or switching power supplies; (6)Adjusts to hold time of the power supply; (7)Supplies necessary signals for processor interface; (8)Accurate 5% or 10% VCC monitoring; (9)Replaces power-up reset circuitry; (10)No external capacitors required; (11)Optional 16-pin SOIC surface mount package.

Diagrams

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
DS1231S-20
DS1231S-20

Maxim Integrated Products

Supervisory Circuits Power Monitor

Data Sheet

0-41634: $3.01
DS1231S-20/T&R
DS1231S-20/T&R

Maxim Integrated Products

Supervisory Circuits Power Monitor

Data Sheet

0-1000: $3.04
1000-41601: $3.04
DS1231S-20+
DS1231S-20+

Maxim Integrated Products

Supervisory Circuits Power Monitor

Data Sheet

0-1: $7.13
1-25: $4.79
25-50: $3.47
50-100: $3.43
DS1231S-20N+
DS1231S-20N+

Maxim Integrated Products

Supervisory Circuits Power Monitor

Data Sheet

0-1: $8.20
1-25: $5.51
25-50: $3.99
50-100: $3.95
DS1231S-20+T&R
DS1231S-20+T&R

Maxim Integrated Products

Supervisory Circuits Power Monitor

Data Sheet

0-741: $3.26
741-1000: $2.90
DS1231S-20N
DS1231S-20N

Maxim Integrated Products

Supervisory Circuits Power Monitor

Data Sheet

0-41609: $3.47