MIC2776N-BM5 Micrel Inc, MIC2776N-BM5 Datasheet

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MIC2776N-BM5

Manufacturer Part Number
MIC2776N-BM5
Description
Manufacturer
Micrel Inc
Datasheet

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Part Number:
MIC2776N-BM5TR
Manufacturer:
NICHICON
Quantity:
5 928
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 sup-
ported 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
active 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.
September 29, 2000
MIC2776
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
Ordering Information
Part Number
MIC2776N-BM5
MIC2776H-BM5
MIC2776L-BM5
Power_Good
V
V
CORE
I/O
2.5V
1.0V
Manual
Reset
Marking
UMAA
UKAA
ULAA
R1
R2
VDD
IN
/MR
Active-Low, Complementary /RST
Active-High, Complementary RST
MIC2776L
Open-Drain, Active-Low /RST
/RST
GND
1
Reset Output
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
Advance Information
input
GND
MIC2776
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
DD
(7V abs. max.)
DD
(7V abs.
SOT-23-5
SOT-23-5
SOT-23-5
Package
MIC2776
Micrel

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MIC2776N-BM5 Summary of contents

Page 1

... 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. Ordering Information Part Number MIC2776N-BM5 MIC2776H-BM5 MIC2776L-BM5 Typical Application V CORE V ...

Page 2

... GND RST VDD SOT-23-5 (M5) “H” Version Pin Description Pin Number Pin Number Pin Name MIC2776H MIC2776L MIC2776N MIC2776 Pin Function RST Digital (Output): Asserted high whenever V voltage. It will remain asserted for no less than 140ms after V above the threshold limit. /RST Digital (Output): Asserted low whenever V voltage ...

Page 3

MIC2776 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 ...

Page 4

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

Page 5

MIC2776 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 ...

Page 6

MIC2776 Application Information Programming the Voltage Threshold Referring to the “Typical Application Circuit”, the voltage threshold is calculated as follows × REF R2 where V = 0.300V REF In order to ...

Page 7

... Some microprocessors have reset signal pins that are bidi- rectional, 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 2. ...

Page 8

... TEL This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. MIC2776 1.75 (0.069) 3 ...

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