MIC2776NBM5 Micrel Inc, MIC2776NBM5 Datasheet

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MIC2776NBM5

Manufacturer Part Number
MIC2776NBM5
Description
Manufacturer
Micrel Inc
Datasheet

Specifications of MIC2776NBM5

Number Of Voltage Supervisors
1
Monitored Supervisor Voltage
0.3
Reset Threshold Voltage (min)
295mV
Reset Threshold Voltage (max)
305mV
Operating Supply Voltage (min)
1.5V
Operating Supply Voltage (max)
5.5V
Package Type
SOT-23
Operating Temperature Classification
Industrial
Operating Temp Range
-40C to 85C
Pin Count
5
Mounting
Surface Mount
Lead Free Status / Rohs Status
Not Compliant

Available stocks

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Price
Part Number:
MIC2776NBM5
Manufacturer:
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800
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Quantity:
2 950
General Description
The MIC2776 is a power supply supervisor which provides
under-voltage monitoring and power-on reset generation in a
compact 5-pin SOT package. Features include an adjustable
under-voltage 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 300mV 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 140ms 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 ac-
tive at least 140ms 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 3.0µA.
Typical Application
IttyBitty™ is a trademark of Micrel, Inc.
November 2005
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Power_Good
V
V
CORE
I/O
2.5V
1.0V
Manual
Reset
R1
R2
VDD
IN
/MR
MIC2776L
/RST
GND
1
Features
• User-adjustable input can monitor supplies as low as
• ±1.5% threshold accuracy
• Separate V
• Generates power-on reset pulse (140ms min.)
• Manual reset input
• Choice of active-high, active-low or open-drain active-
• Inputs can be pulled above V
• Open-drain output can be pulled above V
• Ultra-low supply current, 3.0µA typical
• Rejects brief input transients
• IttyBitty™ SOT-23-5 package
Applications
• Monitoring processor, ASIC, or FPGA core voltage
• Computer systems
• PDAs/Hand-held PCs
• Embedded controllers
• Telecommunications systems
• Power supplies
• Wireless / cellular systems
• Networking hardware
0.3V
low reset output
max.)
Micro-Power Low Voltage Supervisor
MICROPROCESSOR
VCORE
/RESET
VI/O
DD
input
GND
MIC2776
DD
(7V abs. max.)
DD
(7V abs.
MIC2776

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MIC2776NBM5 Summary of contents

Page 1

... IttyBitty™ trademark of Micrel, 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 November 2005 Micro-Power Low Voltage Supervisor Features • User-adjustable input can monitor supplies as low as 0.3V • ...

Page 2

Ordering Information Part Number Standard Marking Pb-Free MIC2776N-BM5 UKAA MIC2776N-YM5 MIC2776H-BM5 ULAA MIC2776H-YM5 MIC2776L-BM5 UMAA MIC2776L-YM5 Pin Configuration /MR GND RST VDD SOT-23-5 (M5) “H” Version Pin Description Pin Number Pin Number MIC2776H MIC2776L ...

Page 3

Absolute Maximum Ratings Supply Voltage (V ) .......................................–0.3V to +7V DD Input Voltages ( ...............................–0.3V to +7V IN /MR RST, (/RST) Current .................................................. 20mA Storage Temperature (T ) ........................ –65°C to +150°C S ESD Rating, Note 3 ...

Page 4

Timing Diagram / RST /RST V OL MIC2776 RST RST t RST Propagation delays not shown for ...

Page 5

Functional Diagram / REF GND * Pinout and polarity vary by device type. See ordering information table. Functional Description IN, Under-Voltage Detector Input The voltage present at the IN pin is compared to the ...

Page 6

Application Information Programming the Voltage Threshold Referring to the “Typical Application Circuit”, the voltage threshold is calculated as follows × TH REF R2 where V = 0.300V REF In order to provide ...

Page 7

V CORE 1. MIC2776 I/O 676k 2.5V 5% VDD /RST 324k 1% /MR GND Manual Reset Figure 1. MIC2776 Example Design Interfacing to Processors With Bidirectional Reset Pins Some microprocessors have reset signal pins ...

Page 8

... Package Information MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. ...

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