DS1817R-20-U Maxim Integrated, DS1817R-20-U Datasheet

DS1817R-20-U

Manufacturer Part Number

DS1817R-20-U

Description

Supervisory Circuits

Manufacturer

Maxim Integrated

Series

DS1817r

Datasheet

1.DS1817R-5-U.pdf (5 pages)

Specifications of DS1817R-20-U

Number Of Voltages Monitored

Monitored Voltage

0 V to 5.5 V

Undervoltage Threshold

2.47 V

Overvoltage Threshold

2.64 V

Output Type

Active High, Push-Pull

Manual Reset

Not Resettable

Watchdog

No Watchdog

Battery Backup Switching

No Backup

Power-up Reset Delay (typ)

250 ms

Supply Voltage - Max

5.5 V

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Package / Case

SOT-23

Chip Enable Signals

Minimum Operating Temperature

- 40 C

Power Fail Detection

Yes

Supply Current (typ)

35 uA

Supply Voltage - Min

0 V

Part # Aliases

90-1817R-U20

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FEATURES

§ Automatically restarts a microprocessor after

§ Maintains reset for 150 ms after V

§ Reduces need for discrete components

§ Precision temperature-compensated voltage

§ Accurate 5%, 10% or 20% power monitoring

§ 20% tolerance for use with 3.0-volt systems

§ Low-cost TO-92 or space saving surface

§ Push-pull active high output

§ Operating temperature -40°C to +85°C

DESCRIPTION

The DS1817 EconoReset uses a precision temperature reference and comparator circuit to monitor the

status of the power supply (V

signal is generated which forces reset to the active state. When V

the reset signal is kept in the active state for approximately 150 ms to allow the power supply and

processor to stabilize.

www.maxim-ic.com

power failure

to an in-tolerance condition

reference and voltage sensor

mount SOT-23 packages available

). When an out-of-tolerance condition is detected, an internal power-fail

returns

1 of 5

Active High 3.3V EconoReset

PIN ASSIGNMENT

PIN DESCRIPTION

TO-92

SOT-23

TO-92 PACKAGE

Drawings Section

BOTTOM VIEW

On Website

See Mech.

RST

GND

RST

GND

DALLAS

1 2 3

DS1817

Econo

Reset

returns to an in-tolerance condition,

Active High Reset Output

Power Supply

Ground

Active High Reset Output

Power Supply

Ground

SOT-23 PACKAGE

Drawings Section

TOP VIEW

On Website

See Mech.

DS1817

041002

Related parts for DS1817R-20-U

DS1817R-20-U Summary of contents

Page 1

FEATURES § Automatically restarts a microprocessor after power failure § Maintains reset for 150 ms after in-tolerance condition § Reduces need for discrete components § Precision temperature-compensated voltage reference and voltage sensor § Accurate 5%, 10% ...

Page 2

OPERATION - POWER MONITOR The DS1817 provides the function of detecting out-of-tolerance power supply conditions and warning a processor based system of impending power failure. When V signal is asserted. On power-up, RST is kept active for approximately 150 ms ...

Page 3

TIMING DIAGRAM: POWER-UP Figure 3 TIMING DIAGRAM: POWER-DOWN Figure DS1817 ...

Page 4

ABSOLUTE MAXIMUM RATINGS* Voltage on V Pin Relative to Ground CC Voltage on RST Relative to Ground Operating Temperature Storage Temperature Soldering Temperature * This is a stress rating only and functional operation of the device at these or any ...

Page 5

NOTES: 1. All voltages are referenced to ground. ³ 2.7V. 2. Measured with Measured with RST output open. 4. Measured with 2.7V ³ ms The t value is for ...

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