MIC803-26D2VM3TR - Micrel, Inc. - Datasheet.Directory

MIC803

3-Pin Microprocessor Supervisor Circuit

with Open-Drain Reset Output

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

December 2010 M9999-122310-A

General Description

The MIC803 is a single-voltage supervisor with open-drain

reset output that provides accurate power supply

monitoring and reset generation in microprocessor based

systems. The function of the device is to assert a reset

signal if the power supply voltage drops below the Reset

Threshold voltage, and retain this reset for the Reset

Timeout Period once the power supply increases above

the Reset Threshold voltage.

The MIC803 consumes only 4.5μA of supply current and

offers three reset delay periods of 20ms, 140ms and

1120ms (min). It features factory programmed reset

threshold levels from 2.63V to 4.63V to accommodate

3.0V, 3.3V, and 5.0V power supplies. It is available in the

compact 3-pin SC-70 and SOT-23 packages.

Features

• 4.5μA supply current (typical) at 3.6V

• Open-Drain /RESET output

• /RESET remains valid with VCC as low as 1V

• 20ms, 140ms, or 1120ms (min) reset timeout Options

• 2.63V to 4.63V Preset Voltage Threshold Options

• 2.5% Voltage Threshold Accuracy over temperature

• 3-pin SC70-3 package (2.0mm x 2.1mm)

• 3-pin SOT-23 package (2.3mm x 2.9mm)

• -40˚C to +125˚C Junction Temperature Range

Applications

• Critical microcomputer power monitoring

• Portable equipment

• Solid state drives

• Printers/computers

• Embedded controllers

____________________________________________________________________________________________________________

Typical Application

VCC 100k

VCC

RESET

VCC

µPMIC803

GND GND

RESET

Micrel, Inc. MIC803

December 2010 2 M9999-122310-A

Ordering Information (1)

Part Number Marking Nominal VTH

(V) Min. tRESET (2)

(ms) Junction Temperature

Range Package

MIC803-46D2VC3 AS 4.63 20 –40° to +125°C SC70-3

MIC803-44D2VC3 AP 4.38 20 –40° to +125°C SC70-3

MIC803-41D2VC3 AK 4.10 20 –40° to +125°C SC70-3

MIC803-40D2VC3 A2 4.00 20 –40° to +125°C SC70-3

MIC803-31D2VC3 AG 3.08 20 –40° to +125°C SC70-3

MIC803-30D2VC3 AV 3.00 20 –40° to +125°C SC70-3

MIC803-29D2VC3 AD 2.93 20 –40° to +125°C SC70-3

MIC803-26D2VC3 AA 2.63 20 –40° to +125°C SC70-3

MIC803-46D3VC3 AT 4.63 140 –40° to +125°C SC70-3

MIC803-44D3VC3 AQ 4.38 140 –40° to +125°C SC70-3

MIC803-41D3VC3 AM 4.10 140 –40° to +125°C SC70-3

MIC803-40D3VC3 A5 4.00 140 –40° to +125°C SC70-3

MIC803-31D3VC3 A4 3.08 140 –40° to +125°C SC70-3

MIC803-30D3VC3 AX 3.00 140 –40° to +125°C SC70-3

MIC803-29D3VC3 AE 2.93 140 –40° to +125°C SC70-3

MIC803-26D3VC3 AB 2.63 140 –40° to +125°C SC70-3

MIC803-46D4VC3 AU 4.63 1120 –40° to +125°C SC70-3

MIC803-44D4VC3 AR 4.38 1120 –40° to +125°C SC70-3

MIC803-41D4VC3 AN 4.10 1120 –40° to +125°C SC70-3

MIC803-40D4VC3 A6 4.00 1120 –40° to +125°C SC70-3

MIC803-31D4VC3 AJ 3.08 1120 –40° to +125°C SC70-3

MIC803-30D4VC3 AZ 3.00 1120 –40° to +125°C SC70-3

MIC803-29D4VC3 A3 2.93 1120 –40° to +125°C SC70-3

MIC803-26D4VC3 AC 2.63 1120 –40° to +125°C SC70-3

MIC803-46D2VM3 AS 4.63 20 –40° to +125°C SOT23-3

MIC803-44D2VM3 AP 4.38 20 –40° to +125°C SOT23-3

MIC803-41D2VM3 AK 4.10 20 –40° to +125°C SOT23-3

MIC803-40D2VM3 A2 4.00 20 –40° to +125°C SOT23-3

MIC803-31D2VM3 AG 3.08 20 –40° to +125°C SOT23-3

MIC803-30D2VM3 AV 3.00 20 –40° to +125°C SOT23-3

MIC803-29D2VM3 AD 2.93 20 –40° to +125°C SOT23-3

MIC803-26D2VM3 AA 2.63 20 –40° to +125°C SOT23-3

MIC803-46D3VM3 AT 4.63 140 –40° to +125°C SOT23-3

MIC803-44D3VM3 AQ 4.38 140 –40° to +125°C SOT23-3

MIC803-41D3VM3 AM 4.10 140 –40° to +125°C SOT23-3

MIC803-40D3VM3 A5 4.00 140 –40° to +125°C SOT23-3

MIC803-31D3VM3 A4 3.08 140 –40° to +125°C SOT23-3

MIC803-30D3VM3 AX 3.00 140 –40° to +125°C SOT23-3

MIC803-29D3VM3 AE 2.93 140 –40° to +125°C SOT23-3

MIC803-26D3VM3 AB 2.63 140 –40° to +125°C SOT23-3

Micrel, Inc. MIC803

December 2010 3 M9999-122310-A

Part Number Marking Nominal VTH

(V) Min. tRESET (2)

(ms) Junction Temperature

Range Package

MIC803-46D4VM3 AU 4.63 1120 –40° to +125°C SOT23-3

MIC803-44D4VM3 AR 4.38 1120 –40° to +125°C SOT23-3

MIC803-41D4VM3 AN 4.10 1120 –40° to +125°C SOT23-3

MIC803-40D4VM3 A6 4.00 1120 –40° to +125°C SOT23-3

MIC803-31D4VM3 AJ 3.08 1120 –40° to +125°C SOT23-3

MIC803-30D4VM3 AZ 3.00 1120 –40° to +125°C SOT23-3

MIC803-29D4VM3 A3 2.93 1120 –40° to +125°C SOT23-3

MIC803-26D4VM3 AC 2.63 1120 –40° to +125°C SOT23-3

Notes:

1. 1: All devices available in Tape and Reel only.

2. 2: –40° to +85°C Temp. Range

Part Numbering Convention:

Pin Configuration

3-Pin SC70 3-Pin SOT-23

Pin Description

Pin Number Pin Name Pin Function

1 GND Ground Pin

2 /RESET

/RESET goes low if VCC falls below the reset threshold (VTH), and remains asserted for

one timeout period after VCC exceeds VTH

3 VCC Power Supply Input and monitored voltage

Micrel, Inc. MIC803

December 2010 4 M9999-122310-A

Absolute Maximum Ratings(1)

Supply Voltage (VCC)....................................... -0.3V to 6.0V

Reset Output (/RESET)................................... -0.3V to 6.0V

Input Current (VCC) ......................................................20mA

Output Current (/RESET) ............................................20mA

Rate of Rise (VCC) ................................................... 100V/us

Junction Temperature (TJ)…………………………....+150˚C

Lead Temperature (soldering, 10sec.)....................... 260°C

Storage Temperature (TS)..........................-65°C to +150°C

ESD Rating(3).................................................................. 3kV

Operating Ratings(2)

Supply Voltage (VCC)........................................ 1.0V to 5.5V

Reset Output Voltage (/RESET) ...................... 0.0V to 5.5V

Junction Temperature (TJ) ........................ –40°C to +125°C

Junction Thermal Resistance

3-Pin SC70 (θJA) ..............................................260°C/W

3-Pin SOT23 (θJA)............................................203°C/W

Electrical Characteristics(4)

For typical values, VCC = 5.0V for MIC803-46/44/41/40, VCC = 3.3V for MIC803-31/30/29, VCC = 3.0V for MIC803-26; TJ = 25°C, Bold

values indicate –40°C < TJ < +125°C; unless noted.

Parameter Conditions Min Typ Max Units

Power Supply Input

TJ = -40˚C to +85˚C 1.0 5.5

Operating Voltage Range (VCC) TJ = -40˚C to +125˚C 1.2 5.5

VCC = 5.5V, no Load 5.5 15

TJ = -40˚C to +85˚C VCC = 3.6V, no Load 4.5 10

VCC = 5.5V, no Load 18

Supply Current (ICC)

TJ = +85˚C to +125˚C VCC = 3.6V, no Load 13

µA

Voltage Threshold

TJ = -40˚C to +85˚C 4.50 4.63 4.75

MIC803-46

TJ = -40˚C to +125˚C 4.44 4.82

TJ = -40˚C to +85˚C 4.25 4.38 4.50

MIC803-44 TJ = -40˚C to +125˚C 4.20 4.56

TJ = -40˚C to +85˚C 4.00 4.10 4.20

MIC803-41 TJ = -40˚C to +125˚C 3.97 4.24

TJ = -40˚C to +85˚C 3.89 4.00 4.10

MIC803-40 TJ = -40˚C to +125˚C 3.80 4.20

TJ = -40˚C to +85˚C 3.00 3.08 3.15

MIC803-31 TJ = -40˚C to +125˚C 2.95 3.21

TJ = -40˚C to +85˚C 2.93 3.00 3.08

MIC803-30 TJ = -40˚C to +125˚C 2.90 3.11

TJ = -40˚C to +85˚C 2.82 2.93 3.00

MIC803-29 TJ = -40˚C to +125˚C 2.81 3.05

TJ = -40˚C to +85˚C 2.55 2.63 2.70

Reset Threshold (VTH)

MIC803-26

TJ = -40˚C to +125˚C 2.50 2.76

Micrel, Inc. MIC803

December 2010 5 M9999-122310-A

Electrical Characteristics (Continued)

For typical values, VCC = 5.0V for MIC803-46/44/41/40, VCC = 3.3V for MIC803-31/30/29, VCC = 3.0V for MIC803-26; TJ = 25°C, Bold

values indicate –40°C < TJ < +125°C; unless noted.

Parameter Conditions Min Typ Max Units

Reset Time

VCC to /RESET Delay (tD) VCC = VTH to (VTH – 100mV) 15 μs

TJ = -40˚C to +85˚C 20 35 44 D2

TJ = +85˚C to +125˚C 16 48

TJ = -40˚C to +85˚C 140 230 360 D3

TJ = +85˚C to +125˚C 112 420

TJ = -40˚C to +85˚C 1120 1800 2400

Reset Timeout Period (tRESET)

TJ = +85˚C to +125˚C 900 3200

Reset Output

VCC ≥ 4.0V, ISINK = 3.2mA

0.4 V

VCC > 2.5V, ISINK = 1.2mA

0.3 V

/RESET Output Voltage (VOL)

VCC ≥ 1.0V, ISINK = 50μA

0.3 V

/RESET Output Leakage VCC > VTH, /RESET deasserted 1 μA

Notes:

1. Exceeding the absolute maximum rating may damage the device.

2. The device is not guaranteed to function outside its operating rating.

3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.

4. Specification for packaged product only.

Micrel, Inc. MIC803

December 2010 6 M9999-122310-A

Typical Characteristics

Operat ing Supply Current

vs. Temperat ure

-50 -20 10 40 70 100 130

TEM PERATURE ( °C)

SUPPLY CURRENT ( µA)

= 3.6V

to /RESET Delay

vs. Temperature

-50 -20 10 40 70 100 130

TEM PERATURE ( °C)

t o /RESET DELAY (µ s )

= V

to V

-100mV

Reset Time out Period (D3)

vs. Temperat ure

200

220

240

260

280

300

-50 -20 10 40 70 100 130

TEM PERATURE (°C)

RESET TI MEO UT PERI OD (ms)

= 5.5V

Normalized Reset Threshold

vs. Temp erature

0.988

0.992

0.996

1.000

1.004

-50 -20 10 40 70 100 130

TEMPERA T URE ( °C)

NO RM AL IZED RESET

THRESHO LD (V)

Operat ing Supply Current

vs. Supp ly Vol tage

0123456

SUPPLY VO LTAGE (V)

SUPPLY CURRENT ( µA)

= 2.93V

Maxim um Transient Durati on

vs Overdrive

0 200 400 600 800 1000

O VERDRIVE VOLTA G E, V

- V

(mV)

MAXIMUM TRANSIENT

DURATION ( µ s )

= 2.93V

Micrel, Inc. MIC803

December 2010 7 M9999-122310-A

Timing Diagram

Functional Diagram

RESET

GENERATOR

VCC (3)

GND (1)

RESET (2)

MIC803

-VTH

Micrel, Inc. MIC803

December 2010 8 M9999-122310-A

Application Information

Microprocessor Reset

The /RESET pin is asserted whenever VCC falls below

the Reset Threshold Voltage, VTH. The /RESET pin

remains asserted for the duration of the Reset Timeout

Period (tRESET) after VCC has risen above the Reset

Threshold Voltage. The reset function ensures the

microprocessor is properly reset and powers up in a

known condition after a power failure. /RESET will

remain valid with VCC as low as 1.0V.

The /RESET output is a simple open-drain N-channel

MOSFET structure. A pull-up resistor must be used to

pull this output up to some voltage. For most

applications, this voltage will be the same power supply

that supplies VCC to the MIC803. As shown in Figure 1, it

is possible, however, to tie this resistor to some other

voltage. This will allow the MIC803 to monitor one

voltage while level-shifting the /RESET output to some

other voltage. The pull-up voltage must be limited to

5.5V. The resistor must be small enough to supply

current to the inputs and leakage paths that are driven

by the /RESET output.

Figure 1. MIC803 used in a Multiple Supply System

/RESET Valid at Low Voltage

As VCC drops to 0V, the MIC803 will no longer be able to

pull the /RESET output low, and the pull-up resistor will

pull the output high. The value of the pull-up resistor and

the voltage it is connected to will affect the point at which

this happens.

Figure 2. /RESET at falling VCC

Wire OR’ing The /RESET Output

Since the /RESET output is open-drain, several reset

sources can be wire-ORed, in parallel, to allow resets

from multiple sources.

VCC Transients

The MIC803 is relatively immune to negative-going VCC

glitches below the Reset Threshold. See the Typical

Characteristic Curve, Maximum Transient Duration vs

Overdrive on page 6 of the datasheet. As shown in

Figure 3, the Overdrive Voltage is the difference

between the Threshold Voltage and the minimum point

of the VCC glitch. Typically, an overdrive of 100mV, with

duration of 15μs or less will not cause a reset. If

additional transient immunity is needed, a 0.1μF bypass

capacitor can be placed as close as possible to the

MIC803 on the VCC pin.

Figure 3. VCC Transient

Micrel, Inc. MIC803

December 2010 9 M9999-122310-A

Package Information

3-Pin SC-70 (C3)

Micrel, Inc. MIC803

December 2010 10 M9999-122310-A

3-Pin SOT-23 (M3)

MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com

Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This

information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,

specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual

property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability

whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties

relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product

can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant

into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A

Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully

indemnify Micrel for any damages resulting from such use or sale.