MIC2788 MICREL [Micrel Semiconductor], MIC2788 Datasheet

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MIC2788

Manufacturer Part Number
MIC2788
Description
Push-Button Reset IC
Manufacturer
MICREL [Micrel Semiconductor]
Datasheet
General Description
The MIC2788/MIC2789 are low-current, ultra-small, push-
button reset supervisors with long set-up delays. The
devices feature two manual reset inputs and two reset
outputs. The devices initiate a reset for the reset timeout
period when the /MR0 and /MR1 inputs are asserted low
for a period longer than the set-up delay. The two manual
reset inputs and long set-up period help to avoid
unintended system resets. Both manual reset inputs can
be tied together if a single push-button reset is desired.
The MIC2788 features integrated pull-up resistors on the
/MR0 and /MR1 inputs, while the MIC2789 requires
external pull-up resistors. The PDY input pin selects
between a 2s, 4s or 6s set-up period. Factory-programmed
reset timeout periods 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
microcontrollers, PMICs, or load switches.
The MIC2788/MIC2789 consume a quiescent current of
only 2.9µA and are offered in a tiny, space-saving 8-pin
thin MLF
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
_________________________________________________________________________________________________________________________
Typical Application
October 2011
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 •
®
(2mm x 2mm x 0.55mm) package.
flexibility
when
interfacing
to
various
Features
• 1.6V to 5.5V operating voltage
• 2.9µA supply current when /MR0, /MR1 are not
• Asserting /MR0 and /MR1 for longer than set-up delay
• Programmable delay (PDY) input selects 2.0s, 4.0s or
• Factory-programmed 140ms (min.) or 240ms (min.)
• Integrated /MR0, /MR1 pull-up resistors (MIC2788)
• Dual Reset Outputs:
• −40°C to 85°C ambient operating temperature range
• 8-pin 2mm x 2mm x 0.55mm thin MLF
Applications
• Smart phones
• MP3 players
• Portable navigation devices
• Set-top boxes (STBs)
• Tablets/pads
asserted
asserts reset output for the reset timeout period
6.0s set-up delay
reset timeout period
Open-drain active-low reset (/RST) output
Push-pull active-high reset (RSTP) output
MIC2788/MIC2789
Push-Button Reset IC
http://www.micrel.com
®
M9999-102711-A
package

Related parts for MIC2788

MIC2788 Summary of contents

Page 1

... Both manual reset inputs can be tied together if a single push-button reset is desired. The MIC2788 features integrated pull-up resistors on the /MR0 and /MR1 inputs, while the MIC2789 requires external pull-up resistors. The PDY input pin selects between a 2s set-up period ...

Page 2

... GND Supply Ground. Active-Low Manual Reset Input. The MIC2788 has an internal 65kΩ pull-up resistor to VIN while the MIC2789 requires an external pull-up resistor to VIN if used with a push-button. Pull this pin 3 /MR1 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 ...

Page 3

... Pin Function No Connect. Leave pin floating. Active-Low Manual Reset Input. The MIC2788 has an internal 65kΩ pull-up resistor to VIN while the MIC2789 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 ...

Page 4

... 250μA IN SOURCE V = 5.5V /RST 4 (2) )..................................... +1.6V to +5. .......................... –40°C to +85°C A ® 2mm × 2mm Thin MLF (θ ).............................90°C/W JA Min. Typ. 1.6 3.4 2.9 2.0 1.6 4.0 3.2 6.0 4.8 220 140 350 240 0.8 × VIN 0.8 × VIN 0.8 × VIN MIC2788/MIC2789 Max. Units V 5.5 7.5 µA 2.4 s 4.8 7.2 280 ms 480 0.3 V 0.3 0.3 V μA 0.3 M9999-102711-A ...

Page 5

... MR Programmable Setup Delay Input (PDY) Input Bias Current PDY Pin (I ) PDY October 2011 (4) (Continued) ≤ +85°C; unless noted otherwise. A Conditions MIC2788 only /MR0, /MR1 inputs; MIC2789 only PDY = V , /MR0 = /MR1 = 0V IN PDY = V , /MR0 = V or /MR1 PDY = 0V, /MR0 = /MR1 = 0V ...

Page 6

... V = 3.0V IN PDY = 0V 240 230 220 210 200 60 85 -40 -15 TEMPERATURE (°C) Reset Timeout Delay (Option X) ) vs. Temperature (PDY = V IN 250 V = 3.0V IN PDY = V IN 240 230 220 210 200 -40 -15 TEMPERATURE (°C) MIC2788/MIC2789 M9999-102711-A ...

Page 7

... INPUT VOLTAGE (V) October 2011 Setup Delay vs. Input Voltage 10.0 8.0 PDY =V 6.0 PDY = 0V 4.0 PDY =OPEN 2.0 0 INPUT VOLTAGE (V) 7 MIC2788/MIC2789 Reset Timeout Delay (Option X) vs. Input Voltage 250 240 IN 230 220 210 200 INPUT VOLTAGE (V) M9999-102711 ...

Page 8

... Micrel, Inc. Timing Diagram October 2011 8 MIC2788/MIC2789 M9999-102711-A ...

Page 9

... Micrel, Inc. Functional Diagram October 2011 9 MIC2788/MIC2789 M9999-102711-A ...

Page 10

... MOSFET structure that requires a pull-up resistor. For most applications, the pull-up voltage will be the same as the power supply that supplies V MIC2788/MIC2789. As shown in Figure possible October 2011 to tie this resistor to some other voltage, other than V thus enabling level-shifting of the /RST output. The pull- up voltage must be limited to 5 ...

Page 11

... Micrel, Inc. Typical Applications October 2011 Figure 3. MIC2788/89 Used for Interrupting System Power Figure 4. MIC2788/89 Used for Microcontroller Reset 11 MIC2788/MIC2789 M9999-102711-A ...

Page 12

... Part Number C1 GRM188R71C104KA01D R1, R2, R4 CRCW0603100KJNEA U1 MIC2788-XYMT MIC2789-XYMT Notes: 1. Murata Tel: www.murata.com. 2. Vishay Tel: www.vishay.com. 3. Micrel, Inc.: www.micrel.com. October 2011 Manufacturer Description (1) Murata 0.1µF, 16V capacitor, X7R, 0603 (2) Vishay 100k, 5% resistor, 0603 (3) Micrel, Inc. Push-Button Supervisor Reset ICs 12 MIC2788/MIC2789 Qty M9999-102711-A ...

Page 13

... Micrel, Inc. PCB Layout Recommendations October 2011 Top Layer Top Silkscreen 13 MIC2788/MIC2789 M9999-102711-A ...

Page 14

... Micrel, Inc. PCB Layout Recommendations (Continued) October 2011 Copper Layer Bottom Silkscreen 14 MIC2788/MIC2789 M9999-102711-A ...

Page 15

... Micrel, Inc. Package Information October 2011 8-Pin 2mm × 2mm Thin MLF ® 15 MIC2788/MIC2789 M9999-102711-A ...

Page 16

... Micrel, Inc. Recommended Landing Pattern October 2011 8-Pin 2mm × 2mm Thin MLF ® 16 MIC2788/MIC2789 M9999-102711-A ...

Page 17

... 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 October 2011 indemnify Micrel for any damages resulting from such use or sale. © 2011 Micrel, Incorporated. 17 MIC2788/MIC2789 http://www.micrel.com M9999-102711-A ...

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