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MIC2776L-YM5-TR

P1-P3P4-P6P7-P8
November 2005 1 MIC2776
MIC2776 Micrel, Inc.
MIC2776
Micro-Power Low Voltage Supervisor
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
IN
/RST
VDD
/MR GND
MIC2776L
R1
R2
/RESET
VCORE
GND
Power_Good
V
CORE
1.0V
Manual
Reset
MICROPROCESSOR
VI/O
V
I/O
2.5V
Features
• User-adjustable input can monitor supplies as low as
0.3V
• ±1.5% threshold accuracy
• Separate V
DD
input
• Generates power-on reset pulse (140ms min.)
• Manual reset input
• Choice of active-high, active-low or open-drain active-
low reset output
• Inputs can be pulled above V
DD
(7V abs. max.)
• Open-drain output can be pulled above V
DD
(7V abs.
max.)
• 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
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
IttyBitty™ is a trademark of Micrel, Inc.
MIC2776 Micrel, Inc
MIC2776 2 November 2005
Pin Configuration
RST
VDDIN
/MR
13
4 5
2
GND
SOT-23-5 (M5)
“H” Version
/RST
VDDIN
/MR
13
4 5
2
GND
SOT-23-5 (M5)
“L” and “N” Version
Pin Description
Pin Number Pin Number Pin Name Pin Function
MIC2776H MIC2776L
MIC2776N
1 RST
Digital (Output): Asserted high whenever V
IN
falls below the reference volt-
age. It will remain asserted for no less than 140ms after V
IN
returns above
the threshold limit.
1 /RST
Digital (Output): Asserted low whenever V
IN
falls below the reference volt-
age. It will remain asserted for no less than 140ms after V
IN
returns above
the threshold limit. (open-drain for “N” version)
2 2 GND Ground
3 3 /MR Digital (Input): Driving this pin low initiates an immediate and unconditional
reset. Assuming IN is above the threshold when /MR is released (returns
high), the reset output will be de-asserted no less than 140ms later. /MR
may be driven by a logic signal or a mechanical switch. /MR has an internal
pull-up to V
DD
and may be left open if unused.
4 4 IN Analog (Input): The voltage on this pin is compared to the internal 300mV
reference. An under-voltage condition will trigger a reset sequence.
5 5 VDD Analog (Input): Independent supply input for internal circuitry.
Ordering Information
Part Number
Reset Output Temperature Range Package
Standard Marking Pb-Free Marking
MIC2776N-BM5 UKAA MIC2776N-YM5 UKAA Open-Drain, Active-Low / RST –40ºC to +85ºC SOT-23-5
MIC2776H-BM5 ULAA MIC2776H-YM5 ULAA Active-High, Complementary RST –40ºC to +85ºC SOT-23-5
MIC2776L-BM5 UMAA MIC2776L-YM5 UMAA Active-Low, Complementary /RST –40ºC to +85ºC SOT-23-5
November 2005 3 MIC2776
MIC2776 Micrel, Inc.
Absolute Maximum Ratings (Note 1)
Supply Voltage (V
DD
) .......................................–0.3V to +7V
Input Voltages (V
IN
, V
/MR
) ...............................–0.3V to +7V
RST, (/RST) Current ..................................................
20mA
Storage Temperature (T
S
) ........................ –65°C to +150°C
ESD Rating, Note 3 .................................................... 1.5kV
Operating Ratings (Note 2)
Supply Voltage (V
DD
) .................................. +1.5V to +5.5V
Input Voltages (V
IN
, V
/MR
) ............................–0.3V to +6.0V
Output Voltages
V
/RST
(N version) ......................................–0.3V to +6.0V
V
/RST
, V
RST
(H and L versions) ........ –0.3V to V
DD
+ 0.3V
Ambient Temperature Range (T
A
) .............. –40°C to +85°C
Package Thermal Resistance (
θ
JA
) ....................... 256°C/W
Electrical Characteristics
V
DD
= 3.3V; T
A
= +25°C, bold values indicate –40°C ≤ T
A
≤ +85°C; unless noted
Symbol Parameter Condition Min Typ Max Units
I
DD
Supply Current V
DD
= V
IN
= 3.3V; /MR, RST, /RST open 3.0
µA
IN, UNDER-VOLTAGE DETECTOR INPUT
V
REF
Under-Voltage Threshold T
A
= 25°C 295 300 305 mV
V
HYST
Hysteresis Voltage 3 mv
I
IN
Input Current 5 pA
T
MIN
≤ T
A
≤ T
MAX
10 nA
RESET OUTPUTS (/RST, RST)
t
PROP
Propagation Delay V
IN
= (V
REF(MAX)
+ 100mV) to 20 µs
V
IN
= (V
REF(MIN)
– 100mV)
t
RST
Reset Pulse Width 140 280 ms
V
OL
RST or /RST Output Voltage Low I
SINK
= 1.6mA; 0.3
V
V
DD
≥ 1.6V
I
SINK
= 100µA; 0.3
V
V
DD
≥ 1.2V, Note 4
V
OH
RST or /RST Output Voltage High I
SOURCE
= 500µA; 0.8V
DD
V
V
DD
≥ 1.5V
(H and L Version Only) I
SOURCE
= 10µA; 0.8V
DD
V
V
DD
≥ 1.2V, Note 4
MANUAL RESET INPUTS (/MR)
V
IH
Input High Voltage 1.5V ≤ V
DD
≤ 5.5V 0.7V
DD
V
V
IL
Input Low Voltage 1.5V ≤ V
DD
≤ 5.5V 0.3V
DD
V
t
PROP
Propagation Delay V
/MR
< V
IL
5
µs
t
MIN
Minimum Input Pulse Width Reset Occurs, V
/MR
< V
IL
33 ns
I
PU
Internal Pull-Up Current 100
nA
I
IN
Input Current, /MR V
/MR
< V
IL
100
nA
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 4. V
DD
operating range is 1.5V to 5.5V. Output is guaranteed to be asserted down to V
DD
= 1.2V.
P1-P3P4-P6P7-P8

MIC2776L-YM5-TR

Mfr. #:
Buy MIC2776L-YM5-TR
Manufacturer:
Microchip Technology / Micrel
Description:
Supervisory Circuits Adjustable Voltage Supervisor with 0.3V Threshold, Manual Reset & Active-Low Pus
Lifecycle:
New from this manufacturer.
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