DS1816R-20-U+ - Hytronics - Datasheet.Directory

1 of 5 041002

FEATURES

§ Automatically restarts a microprocessor after

power failure

§ Maintains reset for 150ms after VCC returns to

an in-tolerance condition

§ Reduces need for discrete components

§ Precision temperature-compensated voltage

reference and voltage sensor

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

§ 20% tolerance for use with 3V systems

§ Low-cost TO-92 or space saving SOT-23

packages available

§ Efficient open-drain output with internal

5kW pull-up resistor

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

PIN ASSIGNMENT

PIN DESCRIPTION

TO-92

1 RST Active Low Reset Output

2 VCC Power Supply

3 GND Ground

SOT-23

1 RST Active Low Reset Output

2 VCC Power Supply

3 GND Ground

DESCRIPTION

The DS1816 EconoReset uses a precision temperature reference and comparator circuit to monitor the

status of the power supply (VCC). When an out-of-tolerance condition is detected, an internal power-fail

signal is generated which forces reset to the active state. When VCC returns to an in-tolerance condition,

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

processor to stabilize.

DS1816

3.3V EconoReset with

Open Drain Output

www.maxim-ic.com

TOP VIEW

SOT-23 PACKAGE

See Mech.

Drawings Section

On Website

1 2 3

BOTTOM VIEW

TO-92 PACKAGE

See Mech.

Drawings Section

On Website

DALLAS

DS1816

Econo

Reset

DS1816

2 of 5

OPERATION — POWER MONITOR

The DS1816 provides the function of detecting out-of-tolerance power supply conditions and warning a

processor-based system of impending power failure. When VCC is detected as out-of-tolerance, the RST

signal is asserted. On power-up, RST is kept active for approximately 150ms after the power supply has

reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RST

is released.

BLOCK DIAGRAM (OPEN-DRAIN OUTPUT) Figure 1

APPLICATION EXAMPLE Figure 2

DS1816

3 of 5

TIMING DIAGRAM: POWER-UP Figure 3

TIMING DIAGRAM: POWER-DOWN Figure 4

DS1816

4 of 5

ABSOLUTE MAXIMUM RATINGS*

Voltage on VCC Pin Relative to Ground -0.5V to +7.0V

Voltage on RST Relative to Ground -0.5V to VCC + 0.5V

Operating Temperature Range -40°C to +85°C

Storage Temperature Range -55°C to +125°C

Soldering Temperature 260°C for 10 seconds

* This is a stress rating only and functional operation of the device at these or any other conditions

above those indicated in the operation sections of this specification is not implied. Exposure to

absolute maximum rating conditions for extended periods of time may affect reliability.

RECOMMENDED DC OPERATING CONDITIONS (-40°C to +85°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Supply Voltage VCC 0.0 5.5 V 1

DC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; VCC = 1.2V to 5.5V)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Output Current @ 0.4V IOL +10 mA 2, 3

Operating Current VCC < 5.5V ICC 28 35 mA4

VCC Trip Point (DS1816-5) VCCTP 2.98 3.06 3.15 V 1

VCC Trip Point (DS1816-10) VCCTP 2.80 2.88 2.97 V 1

VCC Trip Point (DS1816-20) VCCTP 2.47 2.55 2.64 V 1

Internal Pull-Up Resistor RP3.5 5.5 7.5 kW7

Output Capacitance COUT 10 pF

AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; VCC = 1.2V to 5.5V)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

RESET Active Time tRST 100 150 250 ms 5

VCC Detect to RST tRPD 25 ms

VCC Slew Rate

(VCCTP (MAX) to VCCTP (MIN))

tF300 ms8

VCC Slew Rate

(VCCTP (MIN) to VCCTP (MAX))

tR0ns

VCC Detect to RST tRPU 100 150 250 ms 5, 6

DS1816

5 of 5

NOTES:

1. All voltages are referenced to ground.

2. Measured with VCC ³ 2.7V.

3. A 1kW external pull-up resistor may be required in some applications for proper operation of the

microprocessor reset control circuit.

4. Measured with RST output open.

5. Measured with 2.7V £ VCC £ 3.3V.

6. tR = 5ms

7. VOH and IOH are a function of the value of RP and the associated output load conditions.

8. The tF value is for reference in defining values for tRPD and should not be considered a requirement for

proper operation or use of the device.

PART MARKING CODES

“A”, “B”, &“C” represent the device type.

810 . . . . DS1810

811 . . . . DS1811

812 . . . . DS1812

813 . . . . DS1813

815 . . . . DS1815

816 . . . . DS1816

817 . . . . DS1817

818 . . . . DS1818

“D” represents the device tolerance.

A . . . . . . 5%

B . . . . . . 10%

C . . . . . . 15%

D . . . . . . 20%

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DS1816

3.3V EconoReset with Open Drain Output

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Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data

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* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses.4.

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DS1816

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Materials Analysis

DS1816R-20/TR+C05

SOT23;3 pin;8 mm

Dwg: 21-0051H (PDF)

Use pkgcode/variation: U3+4*

-40C to +85C

RoHS/Lead-Free: Lead Free

Materials Analysis

DS1816R-5/TR+C04

SOT23;3 pin;8 mm

Dwg: 21-0051H (PDF)

Use pkgcode/variation: U3+4*

-40C to +85C

RoHS/Lead-Free: Lead Free

Materials Analysis

DS1816R-10/T&R/C01

-40C to +85C

RoHS/Lead-Free: See data sheet

DS1816R-20+T&R

-40C to +85C

RoHS/Lead-Free: See data sheet

DS1816R-10+T&R

-40C to +85C

RoHS/Lead-Free: See data sheet

DS1816R-20-U

SOT23;3 pin;8 mm

Dwg: 21-0051H (PDF)

Use pkgcode/variation: U3-4*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1816R-10-U

SOT23;3 pin;8 mm

Dwg: 21-0051H (PDF)

Use pkgcode/variation: U3-4*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1816R-5-U

SOT23;3 pin;8 mm

Dwg: 21-0051H (PDF)

Use pkgcode/variation: U3-4*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1816R-20/T&R

-40C to +85C

RoHS/Lead-Free: See data sheet

DS1816R-10/T&R

-40C to +85C

RoHS/Lead-Free: See data sheet

DS1816R-5/T&R

-40C to +85C

RoHS/Lead-Free: See data sheet

DS1816R-10-U+

SOT23;3 pin;8 mm

Dwg: 21-0051H (PDF)

Use pkgcode/variation: U3+4*

-40C to +85C

RoHS/Lead-Free: Lead Free

Materials Analysis

DS1816R-20-U+

SOT23;3 pin;8 mm

Dwg: 21-0051H (PDF)

Use pkgcode/variation: U3+4*

-40C to +85C

RoHS/Lead-Free: Lead Free

Materials Analysis

DS1816R-5-U+

SOT23;3 pin;8 mm

Dwg: 21-0051H (PDF)

Use pkgcode/variation: U3+4*

-40C to +85C

RoHS/Lead-Free: Lead Free

Materials Analysis

DS1816R-5+T&R

-40C to +85C

RoHS/Lead-Free: See data sheet

DS1816-5+T&R

TO92;3 pin;20 mm

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3+1*

-40C to +85C

RoHS/Lead-Free: Lead Free

Materials Analysis

DS1816-20+T&R

TO92;3 pin;20 mm

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3+1*

-40C to +85C

RoHS/Lead-Free: Lead Free

Materials Analysis

DS1816-10+T&R

TO92;3 pin;20 mm

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3+1*

-40C to +85C

RoHS/Lead-Free: Lead Free

Materials Analysis

DS1816-20/T&R

TO92;3 pin;20 mm

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1816-10/T&R

TO92;3 pin;20 mm

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1816-5/T&R

TO92;3 pin;20 mm

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1816-20

TO92;3 pin;20 mm

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1816-10

TO92;3 pin;20 mm

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1816-5

TO92;3 pin;20 mm

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1816-20+

TO92;3 pin;20 mm

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3+1*

-40C to +85C

RoHS/Lead-Free: Lead Free

Materials Analysis

DS1816-5+

TO92;3 pin;20 mm

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3+1*

-40C to +85C

RoHS/Lead-Free: Lead Free

Materials Analysis

DS1816-10+

TO92;3 pin;20 mm

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3+1*

-40C to +85C

RoHS/Lead-Free: Lead Free

Materials Analysis

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