MIC2786-XHYMT_技术文档

MIC2786/MIC2787

Push-Button Reset IC with Voltage

Supervisor

General Description

Features

The MIC2786/MIC2787 are low-current, ultra-small, push-

button supervisor reset ICs with an integrated supply

voltage monitor. The device features two manual reset

inputs and two reset outputs. The reset outputs are

asserted and held when the supply voltage decreases

below the factory programmed threshold voltage. Reset

will be asserted for the reset timeout delay once the supply

voltage increases above the rising threshold voltage or

when both manual reset inputs are asserted low for longer

than the setup delay time.

• 1.6V to 5.5V operating voltage

• 7.4µA supply current when /MR0, /MR1 not asserted

• 1.66V to 4.63V preset voltage threshold options

• 2.5% voltage threshold accuracy over temperature

• Asserting /MR0 and /MR1 for the setup delay time

asserts reset output for the reset timeout delay

• Programmable delay (PDY) input selects 2s, 4s or 6s

setup delay

• Factory-programmed 140ms (min.) or 240ms (min.)

The MIC2786 features integrated pull-up resistors on the

/MR0 and /MR1 inputs, while the MIC2787 requires

external pull-up resistors. The PDY input pin selects

between a 2s, 4s or 6s setup period. Factory-programmed

reset timeout delays of 140ms (min.) and 240ms (min.) are

available. An active-low, open-drain reset output (/RST)

and an active-high, push-pull reset output (RSTP) provide

flexibility when interfacing to various microcontrollers,

PMICs, or load switches.

reset timeout delay

• Integrated /MR0, /MR1 pull-up resistors (MIC2786)

• Dual reset outputs:

− Open-drain, active-low reset output (/RST)

− Push-pull, active-high reset output (RSTP)

• −40°C to +85°C ambient operating temperature range

• 8-pin 2mm x 2mm x 0.55mm Thin MLF^®package

The MIC2786/MIC2787 consume a quiescent current of

only 7.4µA and are offered in a tiny, space saving 8-pin

Thin MLF^®(2mm x 2mm x 0.55mm) package.

Applications

• Smart phones

• Tablets

• Set-top boxes (STB)

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

_________________________________________________________________________________________________________________________

Typical Application

MLF and MicroLeadFrame are registered trademarks of Amkor Technologies, Inc.

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

M9999-102711-A

October 2011

Micrel, Inc.

MIC2786/87

Ordering Information ⁽¹⁾

Nominal

Threshold

Voltage

Integrated Pull-Up

Resistors

Part Number

Marking Minimum t_RESET(ms)

Package ^(3,4)

8-Pin (2mm × 2mm) Thin MLF^®

MIC2786-XAYMT

MIC2786-YAYMT⁽²⁾

MIC2786-XBYMT⁽²⁾

MIC2786- YBYMT⁽²⁾

MIC2786- XCYMT⁽²⁾

MIC2786-YCYMT⁽²⁾

MIC2786-XDYMT⁽²⁾

MIC2786-YDYMT⁽²⁾

MIC2786-XEYMT⁽²⁾

MIC2786-YEYMT⁽²⁾

MIC2786-XFYMT⁽²⁾

MIC2786-YFYMT⁽²⁾

MIC2786-XGYMT⁽²⁾

MIC2786-YGYMT⁽²⁾

MIC2786-XHYMT⁽²⁾

MIC2786-YHYMT⁽²⁾

MIC2787-XAYMT⁽²⁾

MIC2787-YAYMT⁽²⁾

MIC2787-XBYMT⁽²⁾

MIC2787-YBYMT⁽²⁾

MIC2787-XCYMT⁽²⁾

MIC2787-YCYMT⁽²⁾

MIC2787-XDYMT

MIC2787-YDYMT⁽²⁾

MIC2787-XEYMT⁽²⁾

MIC2787-YEYMT⁽²⁾

MIC2787-XFYMT⁽²⁾

MIC2787-YFYMT⁽²⁾

MIC2787-XGYMT⁽²⁾

MIC2787-YGYMT⁽²⁾

MIC2787-XHYMT⁽²⁾

MIC2787-YHYMT⁽²⁾

Notes:

6XA

6YA

6XB

6YB

6XC

6YC

6XD

6YD

6XE

6YE

6XF

6YF

6XG

6YG

6XH

6YH

7XA

7YA

7XB

7YB

7XC

7YC

7XD

7YD

7XE

7YE

7XF

7YF

7XG

7YG

7XH

7YH

140

240

140

240

140

240

140

240

140

240

140

240

140

240

140

240

140

240

140

240

140

240

140

240

140

240

140

240

140

240

140

240

4.625

4.375

3.075

2.925

2.625

2.313

2.188

1.665

4.625

4.375

3.075

2.925

2.625

2.313

2.188

1.665

Yes

No

1. All devices available in Tape and Reel only.

2. Contact Factory for availability.

3. Thin MLF ^®▲ = Pin 1 identifier.

4. Thin MLF ^®is a Green RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.

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October 2011

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Micrel, Inc.

MIC2786/MIC2787

Pin Configuration

MIC2786/MIC2787

8-Pin (2mm × 2mm) Thin MLF^®

Top View

Pin Description

Pin Number

Pin Name Pin Function

Active-High Push-Pull Reset Output. This output changes from low-to-high when VIN drops below the

selected reset threshold or both manual reset pins are pulled low for the setup delay period. RSTP

remains high for the reset timeout delay after VIN exceeds the reset threshold plus hysteresis voltage

or the setup delay period has elapsed.

1

2

3

RSTP

GND

/MR1

Supply Ground.

Active-Low Manual Reset Input. The MIC2786 has an internal 65kΩ pull-up resistor to VIN, while the

MIC2787 requires an external pull-up resistor to VIN if used with a push button. Pull this pin low to

assert and force a reset. Pulling both manual reset inputs low for the setup delay time causes one

reset output pulse for the reset timeout delay period. Connect to VIN if unused, do not leave floating.

Active-Low Open-Drain Reset Output. This output changes from high-to-low when VIN drops below

the selected reset threshold or both manual reset pins are pulled low for the setup delay period. /RST

remains low for the reset timeout delay after VIN exceeds the reset threshold or the setup delay has

elapsed and it requires an external pull-up resistor.

4

/RST

Programmable Delay Input with Tri-State Connection. When left open, setup delay is 2s, when

connected to GND, setup delay is 4s and when connected to VIN, setup delay is 6s.

5

6

PDY

NC

No Connect. Leave pin floating.

Active Low Manual Reset Input. The MIC2786 has an internal 65kΩ pull-up resistor to VIN, while the

MIC2787 requires an external pull-up resistor to VIN if used with a push button. Pull this pin low to

assert and force a reset. Pulling both manual reset inputs low for the setup delay time causes one

reset output pulse for the reset timeout delay period. If unused, connect to VIN; do not leave floating.

7

/MR0

Supply Voltage Pin. It is the input to the Supply Voltage monitor. When the supply voltage falls below

the reset threshold voltage, reset outputs (/RST and RSTP) are triggered immediately. When the

supply voltage rises above the reset threshold plus hysteresis voltage, the reset outputs remain

asserted for the duration of the reset timeout delay. A minimum 0.1μF decoupling ceramic capacitor

must be connected between VIN and GND close to the pins.

8

VIN

EPAD

Exposed Pad. Connect to GND.

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Micrel, Inc.

MIC2786/MIC2787

Absolute Maximum Ratings⁽¹⁾

Operating Ratings⁽²⁾

Supply Voltage (V_IN)..................................... +1.6V to +5.5V

Reset Input Voltage (/MR0, /MR1)......................... 0V to V_IN

Open Drain Reset Output (/RST)...................... 0V to +5.5V

Push-Pull Reset Output (RSTP) ............................ 0V to V_IN

Tri-State Programmable Delay (PDY).................... 0V to V_IN

Ambient Temperature (T_A) ..........................−40°C to +85°C

Junction Thermal Resistance

Supply Voltage (V_IN)..................................... −0.3V to +6.0V

Reset Input Voltage (/MR0, /MR1).......... −0.3V to V_IN+0.3V

Open Drain Reset Output (/RST)................. −0.3V to +6.0V

Push-Pull Reset Output (RSTP).............. −0.3V to V_IN+0.3V

Tri-State Programmable Delay (PDY)..... −0.3V to V_IN+0.3V

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

Junction Temperature (T_J) ........................−40°C to +150°C

Storage Temperature (Ts).........................−55°C to +150°C

ESD Rating (Human Body Model) ⁽³⁾..............................2kV

ESD Rating (Machine Model) ⁽³⁾...................................300V

2mm × 2mm Thin MLF^®(θ_JA).............................90°C/W

Electrical Characteristics⁽⁴⁾

V_IN= 3.0V, T_A= 25°C, Bold values indicate −40°C ≤ T_A≤ +85°C; unless noted otherwise.

Parameter

Conditions

Min.

1.6

Typ.

Max.

Units

Power Supply Input

Supply Voltage (V_IN)

5.5

V

V_IN= 5V; /MR0, /MR1, /RST, RSTP, and PDY

open

7.9

7.4

12.5

Supply Current (I_VIN

)

µA

V_IN= 3V; /MR0, /MR1, /RST, RSTP, and PDY

open

Reset Threshold Voltage

4.533

4.509

4.288

4.266

4.625

4.375

4.718

4.741

4.463

4.484

A (falling) T_A= 25°C

A (falling) −40°C ≤ T_A≤ +85°C

B (falling) T_A= 25°C

B (falling) –40°C ≤ T_A≤ +85°C

C (falling) T_A= 25°C

3.014

2.998

2.867

2.852

2.573

2.559

2.267

2.255

2.144

2.133

1.632

1.623

3.075

2.925

2.625

2.313

2.188

1.665

3.137

3.152

2.984

2.998

2.678

2.691

2.359

2.371

2.232

2.243

1.698

1.707

C (falling) –40°C ≤ T_A≤ +85°C

D (falling) T_A= 25°C

Reset Threshold Voltage (V_TH

)

D (falling) –40°C ≤ T_A≤ +85°C

E (falling) T_A= 25°C

V

E (falling) –40°C ≤ T_A≤ +85°C

F (falling) T_A= 25°C

F (falling) –40°C ≤ T_A≤ +85°C

G (falling) T_A= 25°C

G (falling) –40°C ≤ T_A≤ +85°C

H (falling) T_A= 25°C

H (falling) –40°C ≤ T_A≤ +85°C

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Micrel, Inc.

MIC2786/MIC2787

Electrical Characteristics ⁽⁴⁾(Continued)

V_IN= 3.0V, T_A= 25°C, Bold values indicate −40°C ≤ T_A≤ +85°C; unless noted otherwise.

Parameter

Conditions

A, B

Min.

Typ.

0.5

Max.

Units

%

Hysteresis Voltage (V_HYST

Reset Time

)

C, D, E, F, G, H

1.0

%

PDY = Open

PDY = 0V

PDY = V_IN

Option X

1.6

3.2

4.8

140

240

2.0

4.0

6.0

220

350

2.4

4.8

7.2

280

480

s

Setup Delay (t_SETUP

)

s

ms

Reset Timeout Delay (t_RESET

)

Option Y

Reset Outputs (/RST, RSTP)

0.3

V_IN= 4.5V, I_SINK= 3.2mA

V_IN= 3.3V, I_SINK= 2.5mA

V_IN= 1.6V, I_SINK= 1.0mA

V_IN= 4.5V, I_SOURCE= 0.8mA

V_IN= 2.7V, I_SOURCE= 0.5mA

V_IN= 1.6V, I_SOURCE= 250μA

V_/RST= 5.5V

Reset Output Voltage Low

(/RST Output and RSTP Output) (V_OL

V

)

0.8 × V_IN

Reset Output Voltage High

V

(RSTP Output) (V_OH

)

/RST Output Leakage (I_LO

)

0.3

μA

Manual Reset Inputs (/MR0, /MR1)

Input High Voltage (V_IH)

1.2

V

Input Low Voltage (V_IL)

0.3

1.0

Internal Pull-Up Resistor (R_PU

Leakage Current /MR0, /MR1 Pin (I_MR

Programmable Setup Delay Input (PDY)

)

MIC2786 only

65

kΩ

μA

)

/MR0, /MR1 inputs; MIC2787 only

−1.0

PDY = V_IN, /MR0 = /MR1 = 0V

PDY = V_IN, /MR0 = V_INor /MR1= V_IN

PDY = 0V, /MR0 = /MR1 = 0V

+60

100

-60

μA

nA

μA

nA

Input Bias Current PDY Pin (I_PDY

)

PDY = 0V, /MR0 = V_INor /MR1 = V_IN

100

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.

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Micrel, Inc.

MIC2786/MIC2787

Typical Characteristics

Setup Delay

vs. Temperature (PDY = OPEN)

Reset Timeout Delay (Option X )

vs. Temperature (PDY = OPEN)

V_INSupply Current

vs. Temperature (PDY = OPEN)

9.0

3.0

2.5

2.0

1.5

1.0

250

240

230

220

210

200

V_IN= 3.0V

PDY = OPEN

8.2

7.4

6.6

5.8

5.0

-40

-15

10

35

60

85

-40

-15

10

35

60

85

-40

-15

10

35

60

85

TEMPERATURE (°C)

Setup Delay

Reset Timeout Delay (Option X )

vs. Temperature (PDY = 0V)

V_INSupply Current

vs. Temperature (PDY = 0V)

9.0

8.2

7.4

6.6

5.8

5.0

4.5

4.0

3.5

3.0

250

240

230

220

210

200

V_IN= 3.0V

PDY = 0V

V_IN= 3.0V

PDY = 0V

V_IN= 3.0V

PDY = 0V

-15

10

35

60

-40

-15

10

35

60

-40

-15

10

35

60

TEMPERATURE (°C)

Setup Delay

Reset Timeout Delay (Option X )

vs. Temperature (PDY = V_IN)

V_INSupply Current

vs. Temperature (PDY = V_IN)

7.0

6.5

6.0

5.5

5.0

9.0

8.2

7.4

6.6

5.8

5.0

250

240

230

220

210

200

V_IN= 3.0V

PDY = V_IN

V_IN= 3.0V

PDY = V_IN

V_IN= 3.0V

PDY = V_IN

-15

10

35

60

-40

-15

10

35

60

-40

-15

10

35

60

TEMPERATURE (°C)

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Micrel, Inc.

MIC2786/MIC2787

Typical Characteristics (Continued)

Setup Delay

vs. Input Voltage

Reset Timeout Delay (Option X )

vs. Input Voltage

V_INSupply Current

vs. Input Voltage

9.8

9.0

8.2

7.4

6.6

5.8

10.0

8.0

6.0

4.0

2.0

0.0

250

240

230

220

210

200

/MR0 = NOT ASSERTED

/MR1 = NOT ASSERTED

PDY = V_IN

PDY = 0V

PDY = OPEN

0

1

2

3

4

5

6

0

1

2

3

4

5

6

0

1

2

3

4

5

6

INPUT VOLTAGE (V)

Normalized Reset Threshold

vs. Temperature

1.060

1.040

1.020

1.000

0.980

0.960

0.940

0.920

-40

-15

10

35

60

85

TEMPERATURE (°C)

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Micrel, Inc.

MIC2786/MIC2787

Timing Diagram

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Micrel, Inc.

MIC2786/MIC2787

Functional Diagram

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Micrel, Inc.

MIC2786/MIC2787

Application Information

Dual Manual Reset Inputs (/MR0, /MR1)

The /MR0, /MR1 input pins have integrated pull-up

resistors for the MIC2786 but require external pull-up

resistors for the MIC2787. A recommended value is

100kΩ to keep the current consumption low when the

push-button switches are pressed. The behavior of the

reset outputs is independent of the order in which the

/MR0, /MR1 inputs are driven low. If both inputs are low

for a setup delay time, only one reset pulse, of width

t_RESET, is generated. Keeping both inputs low for a

longer time does not generate additional reset output

pulses.

Design and Product Advantages

The MIC2786/MIC2787 are voltage supervisor reset ICs

with dual manual reset inputs and long manual reset

setup delay times. The dual manual reset inputs and

long manual reset setup delay times help protect against

accidental system resets in applications such as smart

phones, personal navigation devices, MP3 players, and

set-top boxes (STB).

The MIC2786/MIC2787 assert and hold a reset when the

supply voltage decreases below the factory-programmed

threshold voltage. Reset is asserted for a fixed reset

timeout delay once the supply voltage increases above

the rising threshold voltage or when both manual reset

inputs are asserted low for longer than the setup delay

time.

Reset Outputs (/RST and RSTP)

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

MOSFET structure that requires a pull-up resistor to an

external voltage. For most applications, the pull-up

voltage will be the same as the power supply that

supplies V_INto the MIC2786/MIC2787. As shown in

Figure 1, it is possible to tie this resistor to some other

voltage, other than V_IN, thus enabling level-shifting of the

/RST output. The pull-up voltage must be limited to 5.5V

or less to avoid damage to the MIC2786/MIC2787. The

pull-up resistor must be small enough to supply current

to the inputs and leakage paths that are driven by the

/RST output (a recommended value is 100kΩ). Leave

floating if the /RST pin is unused.

The MIC2786/MIC2787 feature manual reset setup

delay times of 2s, 4s or 6s, which are selected by the tri-

state programmable delay input pin (PDY). They are

available with factory-programmed reset timeout delays

of 140ms (min.) or 240ms (min.). Both the MIC2786 and

MIC2787 feature an active-low, open-drain reset output

(/RST) and an active-high, push-pull reset output

(RSTP). This allows flexibility for interfacing with different

microprocessors, PMICs, and load-switches. The

MIC2786 features 65kΩ pull-up resistors on the /MR0

and /MR1 inputs to provide ease when connecting to

push-button inputs. The MIC2787 does not provide pull-

up resistors on the manual reset inputs and is intended

for directly interfacing to logic outputs.

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

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

from multiple sources. By tying the pull-up resistor to

some other voltage, the MIC2786/MIC2787 can monitor

one voltage while level-shifting the /RST output to some

other voltage.

Supply Bypass Capacitor

A 0.1µF input bypass capacitor must be placed from V_IN

(Pin 8) to GND (Pin 2).

The RSTP pin is a push-pull output that is driven to V_IN.

It cannot be level-shifted to another voltage. It is an

inverted signal of /RST.

Programmable Delay Input (PDY)

The MIC2786/MIC2787 has a programmable setup

delay time, t_SETUPthat is set via a tri-state logic

configuration. The PDY pin is intended to be connected

to the V_INsupply voltage, ground or left floating.

PDY Configuration

t_SETUP

2s

OPEN

GND

V_IN

4s

6s

Figure 1. MIC2786/MIC2787 Used in Multiple Supply

System

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Micrel, Inc.

MIC2786/MIC2787

Asserting /RST and RSTP Outputs

a) When Functioning as a Manual Reset

The reset outputs /RST and RSTP are asserted when

the setup delay time, t_SETUP, is exceeded while the /MR0,

/MR1 pins are driven low. Both the reset outputs remain

asserted for a factory-programmed reset timeout delay

time t_RESET. Two options are available with 140ms or

240ms minimum t_RESETduration. The /RST pin is driven

active low while the RSTP pin is driven active high for

the t_RESETduration. The reset outputs are undefined for

V_IN< 1.6V.

Figure 3. Voltage Monitor Function

V_INTransients

The MIC2786/MIC2787 is relatively immune to small

negative-going V_INglitches below the reset threshold. As

shown in Figure 4, the overdrive voltage is the difference

between the threshold voltage and the minimum point of

the V_INglitch. Typically, an overdrive of 100mV, with

duration of 20μs or less will not cause a reset.

Figure 2. Manual Reset Function

b) When Functioning as a Voltage Monitor

The /RST pin is asserted whenever V_INfalls below the

reset threshold voltage, V_TH(V_IN< V_TH). The V_INpin

circuitry includes hysteresis to prevent /RST or RSTP pin

chattering due to noise. The /RST pin remains asserted

for the duration of the reset timeout delay (t_RESET) after

V_INhas risen above the reset threshold voltage plus the

hysteresis. The reset function ensures a microprocessor

is properly reset and powers up in a known condition

after a power failure. /RST remains valid with V_INas low

as 1.6V. The RSTP output is a compliment of the /RST

output.

Figure 4. V_INTransient

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Micrel, Inc.

MIC2786/MIC2787

Typical Applications

Figure 5. MIC2786/MIC2787 Used for Interrupting System Power

Figure 6. MIC2786/MIC2787 Used for Microcontroller Reset

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Micrel, Inc.

MIC2786/MIC2787

Evaluation Board Schematic

Bill of Materials

Item

Part Number

Manufacturer Description

Qty.

1

C1

GRM188R71C104KA01D

CRCW0603100KJNEA

MIC2786-XDYMT

MIC2787-XDYMT

Murata⁽¹⁾

Vishay⁽²⁾

0.1µF, 16V capacitor, X7R, 0603

100k, 5% resistor, 0603

R1, R2, R4

3

U1

Micrel, Inc.⁽³⁾

Push-Button Reset IC with Supply Voltage Supervisor

1

Notes:

1. Murata Tel: www.murata.com.

2. Vishay Tel: www.vishay.com.

3. Micrel, Inc.: www.micrel.com.

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Micrel, Inc.

MIC2786/MIC2787

PCB Layout Recommendations

Top Layer

Top Silkscreen

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Micrel, Inc.

MIC2786/MIC2787

PCB Layout Recommendations (Continued)

Copper Layer

Bottom Silkscreen

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Micrel, Inc.

MIC2786/MIC2787

Package Information

8-Pin 2mm × 2mm Thin MLF^®

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Micrel, Inc.

MIC2786/MIC2787

Recommended Landing Pattern

Red circle indicates Thermal Via. Size should be .300mm − .350mm in diameter and it should be connected to GND

plane for maximum thermal performance.

8-Pin 2mm × 2mm Thin MLF^®

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.

M9999-102711-A

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型号：	MIC2786-XHYMT
厂家：	MICREL SEMICONDUCTOR
描述：	Push-Button Reset IC with Voltage Supervisor 按钮复位IC与电压监控器监控
文件：	总17页 (文件大小：579K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MIC2786-XHYMT [MICREL]

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MIC2787