DS1233-15/T&R/STR - Hytronics

1 of 5 122001

FEATURES

§ Automatically restarts microprocessor after

power failure

§ Monitors pushbutton for external override

§ Internal circuitry debounces pushbutton

switch

§ Maintains reset for 350ms after VCC returns to

an in-tolerance condition or pushbutton

released

§ Accurate 5%, 10%, or 15% microprocessor

5V power supply monitoring

§ Reduces need for discrete components

§ Precision temperature-compensated voltage

reference and voltage sensor

§ Low-cost TO-92 package or surface-mount

SOT-223 package

§ Internal 5kW pull-up resistor

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

PIN ASSIGNMENT

PIN DESCRIPTION

PIN 1 GROUND

PIN 2 RESET

PIN 3 VCC

PIN 4 GROUND (SOT-223 ONLY)

DESCRIPTION

The DS1233 EconoReset monitors two vital conditions for a microprocessor: power supply and external

override. A precision temperature-compensated reference and comparator circuit are used 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 350ms to allow the power supply and

processor to stabilize. The second function of the DS1233 is pushbutton reset control. The DS1233

debounces a pushbutton closure and will generate a 350ms reset pulse upon release.

OPERATION — POWER MONITOR

The DS1233 provides the functions 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, as

defined by the tolerance of the part selected, the RST signal is asserted. On power-up, RST is kept active

for approximately 350ms after the power supply has reached the selected tolerance. This allows the power

supply and microprocessor to stabilize before RST is released.

DS1233

5V EconoReset

www.maxim-ic.com

1 2 3

BOTTOM VIEW

TO-92 PACKAGE

See Mech.

Drawings Section

on Website

TOP VIEW

SOT-223 PACKAGE

See Mech.

Drawings Section

on Website

DALLAS

DS1233

Econo

Reset

DS1233

2 of 5

OPERATION — PUSHBUTTON RESET

The DS1233 provides for a pushbutton switch to be connected to the RST output pin. When the DS1233

is not in a reset cycle, it continuously monitors the RST signal for a low going edge. If an edge is

detected, the DS1233 will debounce the switch by pulling the RST line low. After the internal timer has

expired, the DS1233 will continue to monitor the RST line. If the line is still low, the DS1233 will

continue to monitor the line looking for a rising edge. Upon detecting a release, the DS1233 will force the

RST line low and hold it low for 350ms.

NOTE:

For proper operation with an external pushbutton, a capacitor between 100pF and 0.01mF must be

connected between RST and ground. In applications where additional reset current is required, a

minimum capacitance of 500pF should be used, along with a parallel external pull-up resistor of

1kW minimum.

BLOCK DIAGRAM Figure 1

APPLICATION EXAMPLE Figure 2

DS1233

3 of 5

PUSHBUTTON RESET Figure 3

POWER UP Figure 4

POWER DOWN Figure 5

DS1233

4 of 5

ABSOLUTE MAXIMUM RATINGS*

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

Voltage on I/O 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 1.2 5.0 5.5 V 1

DC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; VDD = 5V ± 10%)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Low Level @ RST VOL 0.4 V 1

Output Current @ 0.4V IOL +8 mA

Operating Current ICC 50 mA

VCC Trip Point 5% VCCTP0 4.50 4.625 4.75 V 1

VCC Trip Point 10% VCCTP1 4.25 4.375 4.49 V 1

VCC Trip Point 15% VCCTP2 4.0 4.125 4.24 V 1

Output Capacitance COUT 10 pF

Pushbutton Detect PBDV 1.8 3.3 V 1

Pushbutton Release PBRD 0.3 0.8 V 1, 2

Internal Pull-Up Resistor RP3.75 5 6.25 kW

AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; VCC = 5V ± 10%)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

RESET Active Time tRST 250 350 450 ms

VCC Detect to RST tRPD 100 ns

VCC Slew Rate (4.75V - 4.00V) tF300 ms

VCC Slew Rate (4.00V - 4.75V) tR0ns

Pushbutton Debounce PBDB 250 350 450 ms

VCC Detect to RST tRPU 250 350 450 ms

NOTES:

1) All voltages are referenced to ground.

2) With a 100pF to 0.01mF capacitor connected from RST to ground.

DS1233

5 of 5

ECONORESET SELECTION GUIDE

VCC TRIP POINT PUSHBUTTON DETECT

MIN TYP MAX MIN TYP MAX

DS1233-15 4.0 4.125 4.24 1.8 - 3.3

DS1233-10 4.25 4.375 4.49 1.8 - 3.3

DS1233-5 4.5 4.625 4.75 1.8 - 3.3

DS1233D-15 4.0 4.125 4.24 N/A N/A

DS1233D-10 4.25 4.375 4.49 N/A N/A

DS1233D-5 4.5 4.625 4.75 N/A N/A

DS1833-15 4.0 4.125 4.24 N/A N/A

DS1833-10 4.25 4.375 4.49 N/A N/A

DS1833-5 4.5 4.625 4.75 N/A N/A

DS1233A-15 2.64 2.72 2.80 0.8 - 2.0

3.3V

DS1233A-10 2.8 2.88 2.97 0.8 - 2.0

ENGLISH • ???? • ??? • ???

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DS1233

Part Number Table

Notes:

See the DS1233 QuickView Data Sheet for further information on this product family or download the DS1233 full data sheet (PDF,

136kB).

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.2.

Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.3.

Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: See full data sheet or Part Naming

Conventions.

* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses.5.

Part Number

Notes

Free

Sample

Buy

Direct

Package:

TYPE PINS SIZE

DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?

Materials Analysis

DS1233Z-10/T&R/C12

-40C to +85C

RoHS/Lead-Free: No

DS1233Z-10/T&R/C11

-40C to +85C

RoHS/Lead-Free: No

DS1233Z-15/T&R/C01

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233Z-15

5V-15%

Monitor

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233Z-10+T&R

5V-10%

2500/Reel

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1233Z-5+T&R

5V-5%

2500/Reel

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1233Z-15+T&R

5V-15%

2500/Reel

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1233Z-10+

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1233Z-5+

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1233Z-15+

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1233Z-10

5V-10%

Monitor

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233Z-5

5V-5%

Monitor

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233Z-15/T&R

5V-15%

2500/Reel

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233Z-5/T&R

5V-5%,

2500/Reel

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233Z-10/T&R

5V-10%

2500/Reel

ST223;3 pin;137

Dwg: 56-G0005-001A (PDF)

Use pkgcode/variation: K3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233-10 SUN MICRO CUSTOM

-40C to +85C

RoHS/Lead-Free: No

DS1233-10/T&R/C01

TO92;3 pin;185

Dwg: 56-G0006-003A (PDF)

Use pkgcode/variation: Q3-4*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233-10/T&R/C02

TO92;3 pin;185

Dwg: 56-G0006-003A (PDF)

Use pkgcode/variation: Q3-4*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233-15/T&R/

TO92;3 pin;185

Dwg: 56-G0006-003A (PDF)

Use pkgcode/variation: Q3-4*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233-15/T&R/STR

TO92;3 pin;185

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233-10

5V-10%

TO92;3 pin;185

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233-5

5V-5%

Monitor

TO92;3 pin;185

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233-15

5V-15%

Monitor

TO92;3 pin;185

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3-1*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233-5/T&R

5V-5%

2000/Reel

TO92;3 pin;185

Dwg: 56-G0006-003A (PDF)

Use pkgcode/variation: Q3-4*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233-15+T&R

5V-15%

2000/Reel

TO92;3 pin;185

Dwg: 56-G0006-003A (PDF)

Use pkgcode/variation: Q3+4*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1233-5+

5V-5%

TO92;3 pin;185

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1233-5+T&R

5V-5%

2000/Reel

TO92;3 pin;185

Dwg: 56-G0006-003A (PDF)

Use pkgcode/variation: Q3+4*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1233-15/T&R

5V-15%

2000/Reel

TO92;3 pin;185

Dwg: 56-G0006-003A (PDF)

Use pkgcode/variation: Q3-4*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233-10+T&R

5V-10%

2000/Reel

TO92;3 pin;185

Dwg: 56-G0006-003A (PDF)

Use pkgcode/variation: Q3+4*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1233-10/T&R

5V-10%,

2000/Reel

TO92;3 pin;185

Dwg: 56-G0006-003A (PDF)

Use pkgcode/variation: Q3-4*

-40C to +85C

RoHS/Lead-Free: No

Materials Analysis

DS1233-10+

TO92;3 pin;185

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1233-15+

TO92;3 pin;185

Dwg: 56-G0006-001A (PDF)

Use pkgcode/variation: Q3+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1233-WAFER

0C to +70C

RoHS/Lead-Free: No

DS1233 DICE

0C to +70C

RoHS/Lead-Free: No

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