MICREL MIC2775-XXBM5 Datasheet
MIC2775 Micrel
RST
/RST
VDD
/MR
GND
MIC2775-17
VDD
OTHER
LOGIC
/RESET
GND
MICROPROCESSOR
Manual
Reset
1.8V
MIC2775
Micro-Power Voltage Supervisor
Advance Information
General Description
The MIC2775 is a power supply supervisor that provides
under-voltage monitoring, manual reset capability, and poweron reset generation in a compact 5-pin SOT package. Features include an under-voltage detector, a delay generator, a
manual reset input, and both active-high and active-low reset
outputs. The under-voltage detector compares VDD against
a fixed threshold. Ten factory-programmed thresholds are
available.
The reset outputs are 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. This reset output will
remain active at least 140ms after the release of /MR. The
/MR input can also be used to daisy-chain the MIC2775 onto
existing power monitoring circuitry or other supervisors.
Hysteresis is included to prevent chattering due to noise.
Typical supply current is a low 3.5µA.
Features
• Monitors power supply for under-voltage conditions
• Choice of factory-programmed thresholds
• Generates 140ms (minimum) power-on RESET pulse
• Manual reset capability
• Both active-high and active-low RESET outputs
• /RST output valid down to 1.2V
• Ultra-low supply current, 3.5µA typical
• Rejects brief input transients
• No external components
• Pin compatible upgrade for MAX825
• IttyBitty™ 5-lead SOT-23 package
Applications
• Monitoring processor core and input/output voltages
• Computer systems
• PDAs, hand-held PCs
• Embedded controllers
• Telecommunications systems
• Power supplies
Ordering Information
Part Number Marking Junction Temp. Range Package
MIC2775-XXBM5 UJXX –40°C to +85°C SOT-23-5
Typical Application
IttyBitty™ is a trademark of Micrel, Inc.
September 29, 2000 1 MIC2775
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
MIC2775 Micrel
Standard Voltage Options*
Voltage Typical Nominal Threshold
Code Application (VDD) Voltage (VTH)
46 5.0V ±5% 4.68
44 5.0V ±10% 4.43
31 3.3V ±5% 3.09
29 3.3V ±10% 2.93
28 3.0V ±5% 2.81
26 2.85V ±5% 2.67
25 2.70V ±5% 2.53
23 2.5V ±5% 2.34
22 2.4V ±5% 2.25
17 1.8V ±5% 1.69
*There are ten standard versions available with an order increment of 3000 pieces. Samples of standard versions are
normally available from stock. Contact factory for information on non-standard versions. Available in tape-and-reel only.
Pin Configuration
Pin Description
Pin Number Pin Name Pin Function
1 RST Digital (Output): Asserted high whenever V
2 GND Ground
3 /RST Digital (Output): Asserted low whenever V
4 /MR Digital (Input): Driving this pin low initiates an immediate and unconditional
5 VDD Analog (Input): Power supply input and the voltage being monitored.
GND
2
/RST
13
VDD/MR
RST
45
SOT-23-5 (M5)
falls below the reference
voltage. It will remain asserted for no less than 140ms after V
DD
above the threshold limit.
falls below the reference
DD
voltage. It will remain asserted for no less than 140ms after V
above the threshold limit.
reset. Assuming V
high), the reset output will be de-asserted no less than 140ms later. /MR
is above the threshold when /MR is released (returns
DD
may be driven by a logic signal or a mechanical switch. /MR has an internal
pull-up to VDD and may be left open if unused.
returns
DD
returns
DD
MIC2775 2 September 29, 2000
MIC2775 Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage (V
Input Voltage (V
RST, (/RST) Current .................................................. 20mA
Storage Temperature (T
) ..................................... –0.3V to +7V
DD
) ....................................... –0.3V to +7V
/MR
) ....................... –65°C to +150°C
S
Operating Ratings (Note 2)
Supply Voltage (V
Input Voltage (V
Ambient Temperature Range (T
Package Thermal Resistance (θJA) ...................... 256°C/W
) .................................. +1.5V to +5.5V
DD
) .................................... –0.3V to +6.0V
/MR
) ............. –40°C to +85°C
A
ESD Rating, Note 3 ................................................... 1.5kV
Electrical Characteristics
Note 5; TA = +25°C, bold values indicate –40°C ≤ TA ≤ +85°C; unless noted
Symbol Parameter Condition Min Typ Max Units
I
DD
Supply Current VDD = V
open, Note 5
VDD VOLTAGE THRESHOLD
V
HYST
Under-Voltage Threshold On V
Hysteresis Voltage 1%
DD
RST, /RST OUTPUTS
t
PROP
Propagation Delay VDD = VTH + 1.5% + 100mV to 20 µs
VDD = VTH – 1.5% - 100 mV
t
RST
V
OL
Reset Pulse Width 140 280 ms
RST or /RST Output Voltage Low I
SINK
VDD ≥ 1.6V
I
SINK
VDD ≥ 1.2V; Note 4
V
OH
RST or /RST Output Voltage High I
SOURCE
VDD ≥ 1.5V
I
SOURCE
VDD ≥ 1.2V; Note 4
/MR INPUT
V
IH
V
IL
t
PROP
t
MIN
I
PU
I
IN
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. VDD operating range is 1.5V to 5.5V. Output is guaranteed to be asserted down to VDD = 1.2V.
Note 5. VDD equals nominal “ Typical Application (VDD)” as shown in “Standard Voltage Options Table.”
Input High Voltage 0.7V
Input Low Voltage 0.3V
Propagation Delay From V
Minimum Input Pulse Width Reset Occurs, V
Internal Pull-up Current 100 nA
Input Current, /MR V
/MR
+1.6%, /MR, RST, /RST 3.5 µA
TH
VTH–1.5%
V
THVTH
+1.5%
= 1.6mA; 0.3 V
= 100µA; 0.3 V
= 500µA; 0.8V
= 10µA; 0.8V
< (VIL –100mV) 5 µs
/MR
< V
/MR
IL
< V
IL
DD
DD
DD
DD
33 ns
100 nA
V
V
V
V
V
V
September 29, 2000 3 MIC2775
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