MICROCHIP MIC2776 Micropower Low Voltage Supervisor Owner's Manual

Owner's Manual for MICROCHIP models including: MIC2776L-YM5-TR, MIC2776, MIC2776 Micropower Low Voltage Supervisor, Micropower Low Voltage Supervisor, Low Voltage Supervisor, Voltage Supervisor, Supervisor

MIC2776 - Micropower Low Voltage Supervisor

Low voltage, supervisor, micropower

Microchip Technology Inc.

mic2776-micropower-low-voltage-supervisor-ds20006705

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mic2776-micropower-low-voltage-supervisor-ds20006705

MIC2776
Micropower Low Voltage Supervisor

Features
· User-Adjustable Input Can Monitor Supplies as Low as 0.3V
· ±1.5% Threshold Accuracy · Separate VDD Input · Generates Power-On Reset Pulse (140 ms min.) · Manual Reset Input · Choice of Active-High, Active-Low or Open-Drain
Active-Low Reset Output · Inputs Can be Pulled Above VDD (7V abs. max.) · Open-Drain Output Can be Pulled Above VDD
(7V abs.max.) · Ultra-Low Supply Current, 3.0 A Typical · Rejects Brief Input Transients · Available in 5-Lead SOT-23 Package
Applications
· Monitoring Processor, ASIC, or FPGA Core Voltage
· Computer Systems · PDAs/Handheld PCs · Embedded Controllers · Telecommunications Systems · Power Supplies · Wireless/Cellular Systems · Networking Hardware

Package Types
MIC2776 5-Lead SOT-23 (M5) (Top View, "H" Version)

/MR GND RST

General Description
The MIC2776 is a power supply supervisor that provides undervoltage monitoring and power-on reset generation in a compact 5-lead SOT-23 package. Features include an adjustable undervoltage detector, a delay generator, a manual reset input, and a choice of active-high, active-low, or open-drain active-low reset output. The user-adjustable monitoring input is compared against a 300 mV reference. This low reference voltage allows monitoring voltages lower than those supported by previous supervisor ICs.
The reset output is 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. The 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 MIC2776 onto existing power monitoring circuitry or other supervisors. Hysteresis is included to prevent chattering due to noise. Typical supply current is a low 3.0 A.

MIC2776 5-Lead SOT-23 (M5) (Top View, "L" and "N" Versions)

/MR GND /RST

VDD

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DS20006705A-page 1

MIC2776

Typical Application Circuit

VCORE 1.0V

VI/O 2.5V R1
R2 Power_Good
Manual Reset

MIC2776L VDD /RST IN
/MR GND

MICROPROCESSOR VCORE VI/O
/RESET GND

Functional Block Diagram
VDD IPU
/MR
IN

GND

VREF

One Shot

Delay

S /Q

/RST* RST*

MIC2776

* Pinout and polarity vary by device type. See the Product Identification System section for more information.

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MIC2776

1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings
Supply Voltage (VDD) ................................................................................................................................... 0.3V to +7V Input Voltages (VIN, 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 Voltages (VIN, V/MR) ......................................................................................................................... 0.3V to +6.0V Output Voltages V/RST (N Version) ...................................................................................................................................... 0.3V to +6.0V V/RST, VRST (H and L Versions) ........................................................................................................0.3V to VDD + 0.3V

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: VDD = 3.3V; 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

IDD

3.0

µA

VDD = VIN = 3.3V; /MR, RST, /RST open

IN, Undervoltage Detector Input

Undervoltage Threshold Hysteresis Voltage
Input Current
Reset Outputs (/RST, RST)

VREF

295

300

305

mV TA = +25°C

VHYST

mV --

pA --

IIN

nA TMIN TA TMAX

Propagation Delay
Reset Pulse Width RST or /RST Output Voltage Low
RST or /RST Output Voltage High (H & L Versions Only)

tPROP

µs

VIN = (VREF(MAX) + 100 mV) to VIN = (VREF(MIN) 100 mV)

tRST

140

280

ms --

VOL

-- --

0.3

ISINK = 1.6 mA; VDD 1.6V

ISINK = 100 µA; VDD 1.2V, Note 1

0.8VDD --

ISOURCE = 500 µA; VDD 1.5V

VOH

0.8VDD

V ISOURCE = 10 µA; VDD 1.2V, Note 1

Manual Reset Inputs (/MR)

Input High Voltage

VIH 0.7VDD --

V 1.5V VDD 5.5V

Input Low Voltage

VIL

-- 0.3VDD V 1.5V VDD 5.5V

Propagation Delay

tPROP

µs V/MR < VIL

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

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DS20006705A-page 3

MIC2776

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 --

VDD 0V

VIN

V/MR

VOH VOL

VRST

VOH VOL

V/RST

VOH VOL

A A

tRST tRST

tRST

>tmin tRST

FIGURE 1-1:

Propagation delays not shown for clarity. Note A. The MIC2776 ignores very brief transients.
See "Applications Information" for details.
Timing Diagram.

VHYST VREF

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MIC2776

2.0 PIN DESCRIPTIONS

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

TABLE 2-1:
Pin Number MIC2776H

PIN FUNCTION TABLE

Pin Number MIC2776L MIC2776N

Pin Name

Description

Digital (Output): Asserted high whenever VIN falls below the

RST reference voltage. It will remain asserted for no less than 140 ms

after VIN returns above the threshold limit.

Digital (Output): Asserted low whenever VIN falls below the

/RST

reference voltage. It will remain asserted for no less than 140 ms after VIN returns above the threshold limit. (Open-drain for "N"

version.)

GND Ground.

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

unconditional reset. Assuming IN is above the threshold when /MR

/MR

is released (returns high), the reset output will be de-asserted no less than 140 ms later. /MR may be driven by a logic signal or a

mechanical switch. /MR has an internal pull-up to VDD and may be left open if unused.

Analog (Input): The voltage on this pin is compared to the internal

300 mV reference. An undervoltage condition will trigger a reset

sequence.

VDD Analog (Input): Independent supply input for internal circuitry.

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DS20006705A-page 5

MIC2776
3.0 FUNCTIONAL DESCRIPTION
3.1 IN, Undervoltage Detector Input
The voltage present at the IN pin is compared to the internal 300 mV reference voltage. A reset is triggered if and when VIN falls below VREF. Typically, a resistor divider is used to scale the input voltage to be monitored such that VIN will fall below VREF as the voltage being monitored falls below the desired trip-point. Hysteresis is employed to prevent chattering due to noise.
3.2 RST, /RST Reset Output
Typically, the MIC2776 is used to monitor the power supply of intelligent circuits such as microcontrollers and microprocessors. By connecting the reset output of a MIC2776 to the reset input of a microcontrollers or microprocessor, the processor will be properly reset at power-on and during power-down and during 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 VIN drops below the threshold voltage. The reset outputs remain asserted for tRST(MIN) after VIN subsequently returns above the threshold boundary and /MR is released. A reset pulse is also generated at power-on.
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 MIC2776's automatic supervisory functions. Driving the /MR input to a logic low causes an immediate and unconditional reset to occur. Assuming VIN is within tolerance when /MR is released (returns high), the reset output 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 contacts 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 Programming the Threshold Voltage
Referring to the Typical Application Circuit, the voltage threshold is calculated as follows:

EQUATION 4-1:

VTH

R-----1----+-----R----2-R2

Where:

VREF = 0.300V

In order to provide the additional criteria needed to solve for the resistor values, the resistors can be selected such that the two resistors have a given total value, that is, R1 + R2 = RTOTAL. Imposing this condition on the resistor values provides two equations that can be solved for the two unknown resistor values. A value such as 1 M for RTOTAL is a reasonable choice because it keeps quiescent current to a generally acceptable level while not causing any measurable errors due to input bias currents. The larger the resistors, the larger the potential errors due to input bias current (IIN). The maximum recommended value of RTOTAL is 3 M.
Applying this criteria and rearranging the VTH expression to solve for the resistor values gives:

EQUATION 4-2:
R2 = -R---T---O----T---A---L---------V----R---E---FVTH
R1 = RTOTAL R2

4.2 Application Example
Figure 4-1 illustrates a hypothetical MIC2776 application in which the MIC2776 is used to monitor the core supply of a high-performance CPU or DSP. The core supply, VCORE, in this example is 1.0V ±5%. The main power rail and I/O voltage, VI/O, is 2.5V ±5%. As shown in Figure 4-1, the MIC2776 is powered by VI/O. The minimum value of VI/O is 2.5V 5% = 2.375V; the maximum is 2.5V + 5% = 2.625V. This is well within the MIC2776's power supply range of 1.5V to 5.5V.

MIC2776

VCORE 1.0V 5%

VI/O 2.5V 5%

R1 676k 1% R2 324k 1%

MIC2776 VDD /RST IN
/MR GND

Manual Reset

MICROPROCESSOR VCORE VI/O
/RESET GND

FIGURE 4-1:

Example Design.

Resistors R1 and R2 must be selected to correspond to the VCORE supply of 1.0V. The goal is to ensure that the core supply voltage is adequate to ensure proper operation, i.e., VCORE (1.0V 5%) = 0.950V. Because there is always a small degree of uncertainty due to the accuracy of the resistors, variations in the devices' voltage reference, etc., the threshold will be set slightly below this value. The potential variation in the MIC2776's voltage reference is specified as ±1.5%. The resistors chosen will have their own tolerance specifications. This example will assume the use of 1% accurate resistors. The potential worst-case error contribution due to input bias current can be calculated once the resistor values are chosen. If the guidelines above regarding the maximum total value of R1 + R2 are followed, this error contribution will be very small thanks to the MIC2776's very low input bias current.

To summarize, the various potential error sources are:

· Variation in VREF: Specified at ±1.5% · Resistor tolerance: Chosen by designer (typically
±1%)
· Input bias current, IIN: Calculated once resistor values are known, typically very small

Taking the various potential error sources into account, the threshold voltage will be set slightly below the minimum VCORE specification of 0.950V so that when the actual threshold voltage is at its maximum, it will not intrude into the normal operating range of VCORE. The target threshold voltage will be set as follows:

Given that the total tolerance on VTH is

EQUATION 4-3:
[VREF tolerance] + [resistor tolerance] = ±1.5% + ±1% = ±2.5%

and

VTHMAX = VCOREMIN

then VCOREMIN = VTH + 2.5%VTH = 1.025VTH

Therefore, solving for VTH results in:

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DS20006705A-page 7

MIC2776

EQUATION 4-4:

VTH

-V---C----O---R---E-----M-----I-N---- 1.025

0----.-9---5---01.025

0.9268 V

Solving for R1 and R2 using this value for VTH and the equations above yields: R1 = 676.3 k 673 k R2 = 323.7 k 324 k The resulting circuit is shown in Figure 4-1.
4.3 Input Bias Current Effects
Now that the resistor values are known, it is possible to calculate the maximum potential error due to input bias current, IIN. As shown in the Electrical Characteristics table, the maximum value of IIN is 10 nA. Note that the typical value is a much smaller 5 pA. The magnitude of the offset caused by IIN is given by:
EQUATION 4-5:
VERROR = IINMAX R1 R2
VERROR = ±1 108A 2.189 105
VERROR = ±2.189 103V
VERROR = ±2.189mV
The typical error is about three orders of magnitude lower than this--close to 1 µV. Generally, the error due to input bias can be discounted. If it is to be taken into account, simply adjust the target threshold voltage downward by this amount and recalculate R1 and R2. The resulting value will be very close to optimal. If accuracy is more important than the quiescent current in the resistors, simply reduce the value of RTOTAL to minimize offset errors.

4.4 Interfacing to Processors with Bidirectional Reset Pins
Some microprocessors have reset signal pins that are bidirectional, rather than input only. The Motorola 68HC11 family is one example. Because the MIC2776N's output is open-drain, it can be connected directly to the processor's reset pin using only the pull-up resistor normally required. See Figure 4-2.

VCC

MICROPROCESSOR

VCC

MIC2776N VDD /RST R1 IN R2 /MR GND

100k /RESET GND

FIGURE 4-2: Reset Pin.

Interfacing to Bidirectional

4.5 Transient Response
The MIC2776 is inherently immune to very short negative going glitches. Very brief transients may exceed the voltage threshold without tripping the output.
As shown in Figure 4-3, the narrower the transient, the deeper the threshold overdrive that will be ignored by the MIC2776. The graph represents the typical allowable transient duration for a given amount of threshold overdrive that will not generate a reset.

100

200

300

RESET COMP. OVERDRIVE, VREFVIN (mV)

FIGURE 4-3: Response.

Typical Input Transient

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4.6 Ensuring Proper Operation at Low Supply
At levels of VDD below 1.2V, the MIC2776L's /RST output driver cannot turn on sufficiently to produce a valid logic low on the /RST output. In this situation, other 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 MIC2776L 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 leakage current and pull-down current. The resistor's value is not critical, however. See Figure 4-4.
The statements above also apply to the MIC2776H's RST output. That is, to ensure valid RST signal levels at 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 4-5.

VCC
R1 R2
Manual Reset

MICROPROCESSOR VCC

MIC2776L VDD /RST IN
/MR GND

/RESET GND
100k Rpull-down

FIGURE 4-4: 1.2V.

MIC2776L Valid /RST Below

VCC
R1 R2
Manual Reset

MIC2776H
VDD RST IN

MICROPROCESSOR VCC
100k Rpull-up
RESET GND

/MR GND

FIGURE 4-5: 1.2V.

MIC2776H Valid RST Below

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MIC2776
DS20006705A-page 9

MIC2776

5.0 PACKAGING INFORMATION 5.1 Package Marking Information

5-Lead SOT-23* (Front)

Example

XXXX

ULAA

5-Lead SOT-23* (Back)
NNN

Example
DW4

Note: The Marking Code for the H version is ULAA; the marking code for the L version is UMAA; the marking code for the N version is UKAA.

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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MIC2776

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DS20006705A-page 11

MIC2776
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MIC2776

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DS20006705A-page 13

MIC2776
NOTES:

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APPENDIX A: REVISION HISTORY
Revision A (August 2022)
· Converted Micrel document MIC2776 to Microchip data sheet DS20006705A.
· Minor text changes throughout.

MIC2776

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DS20006705A-page 15

MIC2776
NOTES:

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MIC2776

PRODUCT IDENTIFICATION SYSTEM

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

Part Number

-X

-XX

Examples:

Device

Reset Output

Temp. Range

Package

Media Type

Device:

MIC2776:

Micropower Low Voltage Supervisor

Reset Output:

N = H = L =

Open-Drain, Active-Low /RST Active-High, Complementary RST Active-Low, Complementary /RST

Temperature Range:

Y = 40°C to +85°C

Package:

M5 = 5-Lead SOT-23

a) MIC2776N-YM5-TR: b) MIC2776H-YM5-TR: c) MIC2776L-YM5-TR: d) MIC2776N-YM5-TX:

MIC2776, Open-Drain, ActiveLow /RST, 40°C to +85°C Temp. Range, 5-Lead SOT-23, 3,000/Reel
MIC2776, Active-High, Complementary RST, 40°C to +85°C Temp. Range, 5-Lead SOT-23, 3,000/Reel
MIC2776, Active-Low, Complementary /RST, 40°C to +85°C Temp. Range, 5-Lead SOT-23, 3,000/Reel
MIC2776, Open-Drain, ActiveLow /RST, 40°C to +85°C Temp. Range, 5-Lead SOT-23, 3,000/Reel Reversed

Media Type:

TR = 3,000/Reel TX = 3,000/Reel Reversed

e) MIC2776L-YM5-TX:

MIC2776, Active-Low, Complementary /RST, 40°C to +85°C Temp. Range, 5-Lead SOT-23, 3,000/Reel Reversed

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.

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DS20006705A-page 17

MIC2776
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.

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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.
AgileSwitch, APT, ClockWorks, The Embedded Control Solutions Company, EtherSynch, Flashtec, Hyper Speed Control, HyperLight Load, Libero, motorBench, mTouch, Powermite 3, Precision Edge, ProASIC, ProASIC Plus, ProASIC Plus logo, Quiet- Wire, SmartFusion, SyncWorld, Temux, TimeCesium, TimeHub, TimePictra, TimeProvider, TrueTime, and ZL are registered trademarks of Microchip Technology Incorporated in the U.S.A.
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: 978-1-6683-0993-3

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DS20006705A-page 19

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

MIC2776 - Micropower Low Voltage Supervisor

Low voltage, supervisor, micropower

Microchip Technology Inc.

mic2776-micropower-low-voltage-supervisor-ds20006705

References