MICROCHIP MIC2775 Low Voltage Supervisor Owner's Manual

The MIC2775 is a micropower low voltage supervisor with various
features including undervoltage monitoring, manual reset input, and
power-on reset generation. It comes in a compact 5-lead SOT-23
package and offers both active-high and active-low reset
outputs.

Product Usage Instructions

Typical Application Circuit:

Functional Block Diagram:

Frequently Asked Questions (FAQ)

Q: What is the operating voltage range of the MIC2775?

A: The operating range is from 1.5V to 5.5V. The output is
ensured to be asserted down to VDD = 1.2V.

Q: Is the MIC2775 sensitive to ESD?

A: Yes, the device is ESD sensitive. Handling precautions are
recommended to prevent damage.

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MIC2775
Micropower Low Voltage Supervisor

Features
· Monitors Power Supply for Undervoltage Conditions
· Choice of Factory-Programmed Thresholds · Generates 140 ms (Minimum) Power-On Reset
Pulse · Manual Reset Capability · Both Active-High and Active-low Reset Outputs · /RST Output Valid Down to 1.2V · Ultra-Low Supply Current, 3.5 A Typical · Rejects Brief Input Transients · No External Components · Available in 5-Lead SOT-23 Package
Applications
· Monitoring Processor Core and Input/Output Voltages
· Computer Systems · PDAs/Handheld PCs · Embedded Controllers · Telecommunications Systems · Power Supplies

General Description
The MIC2775 is a power supply supervisor that provides undervoltage monitoring, manual reset capability, and power-on reset generation in a compact 5-lead SOT-23 package. Features include an undervoltage detector, a delay generator, a manual reset input, and both active-high and active-low reset outputs. The undervoltage detector compares VDD against a fixed threshold. Ten factory-programmed thresholds are available.
The reset outputs are asserted for no less than 140 ms at power-on and any time the input voltage drops below the reference voltage. It remains asserted for the timeout period after the input voltage subsequently rises back above the threshold boundary. A reset can be generated at any time by asserting the manual reset input, /MR. This reset output will remain active at least 140 ms after the release of /MR. The /MR input can also be used to daisy-chain the MIC2775 onto existing power monitoring circuitry or other supervisors. Hysteresis is included to prevent chattering due to noise. Typical supply current is an ultra-low 3.5 A.
Package Type
MIC2775 5-Lead SOT-23 (M5)
(Top View)

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DS20006716A-page 1

MIC2775
Typical Application Circuit
Functional Block Diagram

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MIC2775

1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings
Supply Voltage (VDD) ………………………………………………………………………………………………………………….. 0.3V to +7V Output Voltage (V/MR) …………………………………………………………………………………………………………………. 0.3V to +7V RST, /RST Current ………………………………………………………………………………………………………………………………..20 mA ESD Rating (Note 1) …………………………………………………………………………………………………………………………….. 1.5 kV

Operating Ratings
Supply Voltage (VDD) ……………………………………………………………………………………………………………….. +1.5V to +5.5V Input Voltage (V/MR) …………………………………………………………………………………………………………………. 0.3V to +6.0V

Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability.
Notice: The device is not guaranteed to function outside its operating ratings.
Note 1: Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5 k in series with 100 pF.

ELECTRICAL CHARACTERISTICS

Electrical Characteristics: TA = +25°C, bold values valid for 40°C TA +85°C, unless noted. Note 1

Parameter

Symbol Min. Typ. Max. Units

Conditions

Supply Current
VDD Voltage Threshold Undervoltage Threshold on VDD Pin Hysteresis Voltage Reset Outputs (/RST, RST)
Propagation Delay
Reset Pulse Width RST or /RST Output Voltage Low
RST or /RST Output Voltage High (H & L Versions Only)

IDD

—

3.5

—

µA

VDD = VTH + 1.6%, /MR, RST, /RST open

VREF

VTH 1.5%

VTH

VTH + 1.5%

VHYST

—

V– %–

tPROP

—

µs

VDD = VTH + 1.5% + 100 mV to VDD = VTH 1.5% 100 mV

tRST

140

—

280

ms —

VOL

— —

—

0.3

—

0.3

ISINK = 1.6 mA; VDD 1.6V

ISINK = 100 µA; VDD 1.2V, Note 2

0.8VDD —

—

ISOURCE = 500 µA; VDD 1.5V

VOH

0.8VDD

—

V ISOURCE = 10 µA; VDD 1.2V, Note 2

Manual Reset Inputs (/MR)

Input High Voltage

VIH 0.7VDD —

—

V–

Input Low Voltage

VIL

—

— 0.3VDD V —

Propagation Delay

tPROP

—

µs From V/MR < (VIL 100 mV)

Minimum Input Pulse Width

tMIN

—

ns Reset occurs, V/MR < VIL

Internal Pull-Up Current

IPU

—

100

—

nA —

Input Current, /MR

IIN

—

100

—

nA V/MR < VIL

Note 1: Specification for packaged product only.

2: VDD operating range is 1.5V to 5.5V. Output is ensured to be asserted down to VDD = 1.2V.

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DS20006716A-page 3

MIC2775

TEMPERATURE SPECIFICATIONS

Parameters

Sym. Min. Typ.

Temperature Ranges Storage Temperature Range Ambient Temperature Range Package Thermal Resistances Thermal Resistance, SOT-23 5-Ld

—

256

Max. Units

Conditions

+150 +85

°C — °C —

—

°C/W —

FIGURE 1-1:

Timing Diagram.

Note: Propagation delays not shown for clarity. A = The MIC2775 ignores very brief transients. See the Application Information section for details.

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MIC2775

2.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

TABLE 2-1: PIN FUNCTION TABLE Pin Number Pin Name

Description

/RST

Digital (Output): Asserted low whenever VDD falls below the reference voltage. It will remain asserted for no less than 140 ms after VDD returns above the threshold limit.

GND Ground.

Digital (Output): Asserted high whenever VDD falls below the reference voltage. It

RST will remain asserted for no less than 140ms after VDD returns above the threshold

limit.

Digital (Input): Driving this pin low initiates an immediate and unconditional reset.

/MR

Assuming VDD is above the threshold when /MR is released (returns high), the reset output will be de-asserted no less than 140 ms later. /MR has an internal pull-up to

VDD and may be left open if unused.

VDD Analog (Input): Power supply input and the voltage being monitored.

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DS20006716A-page 5

MIC2775
3.0 FUNCTIONAL DESCRIPTION
3.1 VDD Input
The VDD pin is both the power supply terminal and a monitored input voltage. The voltage at this pin is continually compared against the internal reference. The trip-point at which a reset occurs is factory-programmed. A reset is triggered if and when VDD falls below the trip-point. Hysteresis is employed to prevent chattering due to noise. The comparator on the VDD input is relatively immune to very brief negative-going transients.
3.2 RST, /RST Reset Output
Typically, the MIC2775 is used to monitor the power supply of intelligent circuits such as microcontrollers and microprocessors. By connecting the appropriate reset output of an MIC2775 to the reset input of a microcontroller or microprocessor, the processor will be properly reset at power-on, power-down, and brown-out conditions. In addition, asserting /MR, the manual reset input, will activate the reset function.
The reset outputs are asserted any time /MR is asserted or if VDD drops below the threshold voltage. The reset outputs remain asserted for tRST(MIN) after VDD subsequently returns above the threshold boundary and/or /MR is released. A reset pulse is also generated at power-on. Hysteresis is included in the comparator to prevent chattering of the outputs due to noise.
3.3 /MR, Manual Reset Input
The ability to initiate a reset via external logic or a manual switch is provided in addition to the MIC2775’s automatic supervisory functions. Driving the /MR input to a logic-low causes an immediate and unconditional reset to occur. Assuming VDD is within tolerance when /MR is released (returns high), the reset outputs will be de-asserted no less than tRST later. /MR may be driven by a logic signal or mechanical switch. Typically, a momentary push-button switch is connected such that /MR is shorted to ground when the switch contact close. The switch may be connected directly between /MR and GND. /MR has an internal 100 nA pull-up current to VDD and may be left open if unused.

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4.0 APPLICATION INFORMATION
4.1 Ensuring Proper Operation at Low Supply
At VDD levels below 1.2V, the MIC2775’s /RST output cannot turn on sufficiently to produce a valid logic-low on /RST. In this situation, circuits driven by /RST could be allowed to float, causing undesired operation. In most cases, however, it is expected that the circuits driven by the MIC2775 will be similarly inoperative at VDD 1.2V.
If a given application requires that /RST be valid below VDD = 1.2V, this can be accomplished by adding a pull-down resistor to the /RST output. A value of 100 k is recommended as this is usually an acceptable compromise of quiescent current and pull-down current. The resistor’s value is not critical, however. See Figure 4-1.

MIC2775
4.2 Transient Response
The MIC2775 is inherently immune to very short negative-going glitches. Very brief transients may exceed the voltage threshold without tripping the output. In general, as shown in Figure 4-3, the narrower the transient, the deeper the threshold overdrive that will be ignored by the MIC2775. The graph represents the typical allowable transient duration for a given amount of threshold overdrive that will not generate a reset.

FIGURE 4-3: Response.

Typical VDD Transient

FIGURE 4-1:

Valid /RST Below 1.2V.

The statements above also apply to the MIC2775’s RST output. That is, to ensure valid RST signal levels when VDD < 1.2V, a pull-up resistor (as opposed to a pull-down) should be added to the RST output. A value of 100 k is typical for this application, as well. See Figure 4-2.

FIGURE 4-2:

Valid RST Below 1.2V.

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DS20006716A-page 7

MIC2775

5.0 PACKAGING INFORMATION 5.1 Package Marking Information

5-Lead SOT-23* (Front)

Example

XXXX

UJ23

5-Lead SOT-23* (Back)
NNN

Example
HS1

TABLE 5-1: MARKING CODES
Part Number
MIC2775-17YM5 MIC2775-22YM5 MIC2775-23YM5 MIC2775-25YM5 MIC2775-26YM5 MIC2775-28YM5 MIC2775-29YM5 MIC2775-31YM5 MIC2775-44YM5 MIC2775-46YM5

Marking Code
UJ17 UJ22 UJ23 UJ25 UJ26 UJ28 UJ29 UJ31 UJ44 UJ46

Voltage
1.69V 2.25V 2.34V 2.53V 2.67V 2.81V 2.93V 3.09V 4.43V 4.68V

Legend:

XX…X Y YY WW NNN e3
*

Product code or customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week `01′) Alphanumeric traceability code Pb-free JEDEC® designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3) can be found on the outer packaging for this package.

, , Pin one index is identified by a dot, delta up, or delta down (triangle mark).

Note:

In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. Package may or may not include the corporate logo.
Underbar (_) symbol may not be to scale.

Note:

If the full seven-character YYWWNNN code cannot fit on the package, the following truncated codes are used based on the available marking space: 6 Characters = YWWNNN; 5 Characters = WWNNN; 4 Characters = WNNN; 3 Characters = NNN; 2 Characters = NN; 1 Character = N

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DS20006716A-page 11

MIC2775
NOTES:

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APPENDIX A: REVISION HISTORY
Revision A (August 2022)
· Converted Micrel document MIC2775 to Microchip data sheet DS20006716A.
· Minor text changes throughout.

MIC2775

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DS20006716A-page 13

MIC2775
NOTES:

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MIC2775

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.

Part Number

-XX

Examples:

Device

Voltage Code

Temp. Range

Package

Media Type

a) MIC2775-22YM5-TR:

MIC2775, 2.25V, 40°C to +85°C Temp. Range, 5-Lead SOT-23, 3,000/Reel

Device:

MIC2775:

Micropower Low Voltage Supervisor

b) MIC2775-46YM5-TR:

MIC2775, 4.68V, 40°C to +85°C Temp. Range, 5-Lead SOT-23, 3,000/Reel

Voltage Code:

17 = 1.69V 22 = 2.25V 23 = 2.34V 25 = 2.53V 26 = 2.67V 28 = 2.81V 29 = 2.93V 31 = 3.09V 44 = 4.43V 46 = 4.68V

c) MIC2775-26YM5-TR: d) MIC2775-29YM5-TX: e) MIC2775-31YM5-TR:

MIC2775, 2.67V, 40°C to +85°C Temp. Range, 5-Lead SOT-23, 3,000/Reel
MIC2775, 2.93V, 40°C to +85°C Temp. Range, 5-Lead SOT-23, 3,000/Reel Reversed
MIC2775,3.09V, 40°C to +85°C Temp. Range, 5-Lead SOT-23, 3,000/Reel Reversed

Temperature Range:
Package:

Y = 40°C to +85°C M5 = 5-Lead SOT-23

Note 1:

Tape and Reel identifier only appears in the catalog part number description. This identifier is used for ordering purposes and is not printed on the device package. Check with your Microchip Sales Office for package availability with the Tape and Reel option.

Media Type:

TR = 3,000/Reel TX = 3,000/Reel Reversed (29 Voltage Code only)

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DS20006716A-page 15

MIC2775
NOTES:

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Note the following details of the code protection feature on Microchip products: · Microchip products meet the specifications contained in their particular Microchip Data Sheet.
· Microchip believes that its family of products is secure when used in the intended manner, within operating specifications, and under normal conditions.
· Microchip values and aggressively protects its intellectual property rights. Attempts to breach the code protection features of Microchip product is strictly prohibited and may violate the Digital Millennium Copyright Act.
· Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not mean that we are guaranteeing the product is “unbreakable” Code protection is constantly evolving. Microchip is committed to continuously improving the code protection features of our products.

This publication and the information herein may be used only with Microchip products, including to design, test, and integrate Microchip products with your application. Use of this information in any other manner violates these terms. Information regarding device applications is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. Contact your local Microchip sales office for additional support or, obtain additional support at https:// www.microchip.com/en-us/support/design-help/client-supportservices.
THIS INFORMATION IS PROVIDED BY MICROCHIP “AS IS”. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE, OR WARRANTIES RELATED TO ITS CONDITION, QUALITY, OR PERFORMANCE.
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Trademarks The Microchip name and logo, the Microchip logo, Adaptec, AVR, AVR logo, AVR Freaks, BesTime, BitCloud, CryptoMemory, CryptoRF, dsPIC, flexPWR, HELDO, IGLOO, JukeBlox, KeeLoq, Kleer, LANCheck, LinkMD, maXStylus, maXTouch, MediaLB, megaAVR, Microsemi, Microsemi logo, MOST, MOST logo, MPLAB, OptoLyzer, PIC, picoPower, PICSTART, PIC32 logo, PolarFire, Prochip Designer, QTouch, SAM-BA, SenGenuity, SpyNIC, SST, SST Logo, SuperFlash, Symmetricom, SyncServer, Tachyon, TimeSource, tinyAVR, UNI/O, Vectron, and XMEGA are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
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Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, Augmented Switching, BlueSky, BodyCom, Clockstudio, CodeGuard, CryptoAuthentication, CryptoAutomotive, CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, Espresso T1S, EtherGREEN, GridTime, IdealBridge, InCircuit Serial Programming, ICSP, INICnet, Intelligent Paralleling, IntelliMOS, Inter-Chip Connectivity, JitterBlocker, Knob-on-Display, KoD, maxCrypto, maxView, memBrain, Mindi, MiWi, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PowerSmart, PureSilicon, QMatrix, REAL ICE, Ripple Blocker, RTAX, RTG4, SAM-ICE, Serial Quad I/O, simpleMAP, SimpliPHY, SmartBuffer, SmartHLS, SMART-I.S., storClad, SQI, SuperSwitcher, SuperSwitcher II, Switchtec, SynchroPHY, Total Endurance, Trusted Time, TSHARC, USBCheck, VariSense, VectorBlox, VeriPHY, ViewSpan, WiperLock, XpressConnect, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.
The Adaptec logo, Frequency on Demand, Silicon Storage Technology, and Symmcom are registered trademarks of Microchip Technology Inc. in other countries.
GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries.
All other trademarks mentioned herein are property of their respective companies.
© 2022, Microchip Technology Incorporated and its subsidiaries.
All Rights Reserved.
ISBN: 978-1-6683-1118-9

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DS20006716A-page 17

AMERICAS
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EUROPE
Austria – Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark – Copenhagen Tel: 45-4485-5910 Fax: 45-4485-2829 Finland – Espoo Tel: 358-9-4520-820 France – Paris Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 Germany – Garching Tel: 49-8931-9700 Germany – Haan Tel: 49-2129-3766400 Germany – Heilbronn Tel: 49-7131-72400 Germany – Karlsruhe Tel: 49-721-625370 Germany – Munich Tel: 49-89-627-144-0 Fax: 49-89-627-144-44 Germany – Rosenheim Tel: 49-8031-354-560 Israel – Ra’anana Tel: 972-9-744-7705 Italy – Milan Tel: 39-0331-742611 Fax: 39-0331-466781 Italy – Padova Tel: 39-049-7625286 Netherlands – Drunen Tel: 31-416-690399 Fax: 31-416-690340 Norway – Trondheim Tel: 47-7288-4388 Poland – Warsaw Tel: 48-22-3325737 Romania – Bucharest Tel: 40-21-407-87-50 Spain – Madrid Tel: 34-91-708-08-90 Fax: 34-91-708-08-91 Sweden – Gothenberg Tel: 46-31-704-60-40 Sweden – Stockholm Tel: 46-8-5090-4654 UK – Wokingham Tel: 44-118-921-5800 Fax: 44-118-921-5820

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2022 Microchip Technology Inc. and its subsidiaries 09/14/21

Documents / Resources

MICROCHIP MIC2775 Low Voltage Supervisor [pdf] Owner's Manual
MIC2775-29YM5-TR, MIC277529YM5TR, MIC2775, MIC2775 Low Voltage Supervisor, MIC2775, Low Voltage Supervisor, Voltage Supervisor, Supervisor

References

User Manual

MIC2775 Low Voltage Supervisor

Specifications

Product Information

Features:

Applications:

General Description:

Product Usage Instructions

Typical Application Circuit:

Functional Block Diagram:

Frequently Asked Questions (FAQ)

Q: What is the operating voltage range of the MIC2775?

Q: Is the MIC2775 sensitive to ESD?

Documents / Resources

References

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