MICREL MIC2754-TBM5UET, MIC2753-TBM5UDT, MIC2754-LBM5UEL, MIC2754-MBM5UEM, MIC2754-RBM5UER Datasheet
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June 1999 1 MIC2753/2754
MIC2753/2754 Micrel
MIC2753/2754
Power Supply Supervisors
Preliminary Information
General Description
The MIC2753 and MIC2754 are ultraminiature, full-featured,
power supply supervisors featuring active-high and activelow reset outputs, respectively.
The MIC2753/4 includes an undervoltage detector with a
power-on reset generator and reset output, an overvoltage
detector with a separate output for activating crowbar circuits,
and a debounced manual reset input. Typical supply current
is a low 30µA.
These devices provide a 140ms minimum reset output at
power-on and assert their reset outputs any time the input
voltage deviates beyond preset overvoltage or undervoltage
thresholds. Reset outputs remain asserted for 140ms (minimum) after the input returns to normal or after releasing the
manual reset. When an overvoltage condition is detected, the
overvoltage output is immediately activated. Hysteresis on
both thresholds prevents erratic operation due to noise.
Typical Application
Microcontroller
Manual
Reset
MIC2754
VCC
HVMR
RST
V
CC
VIN
RST IN
GND
GND
Fuse
SCR
Crowbar
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
Features
• Undervoltage and overvoltage monitor
• Separate overvoltage flag output
• Generates 140ms (minimum) power-on reset pulse
• Debounced manual reset input
• Choice of active-high (MIC2753) or
active-low (MIC2754) reset outputs
• Low 30µA typical supply current
• No external components needed
• IttyBitty™ SOT-23-5 package
Applications
• Computer systems
• Embedded controllers
• Power supplies
• Telecommunications systems
MIC2753/2754 Micrel
MIC2753/2754 2 June 1999
Pin Configuration
Part
Identification
RST
MRGND
VIN
UDx
13
45
2
HV HV
MRRST
VIN
UEx
13
45
2
GND
MIC2753
MIC2754
Voltage
Code
Pin Description
Pin No. Pin No. Pin Name Pin Function
MIC2753 MIC2754
1 RST Reset (Digital Output): Active-high output. Asserted when V
IN
falls below
V
THU
(undervoltage threshold), or rises above V
THO
(overvoltage threshold).
Deasserted no less than 140ms after VIN returns within threshold limits.
2 1 /HV High-Voltage Flag (Open-Drain Output): /HV is asserted (active low) when
the input voltage exceeds the V
THO
(overvoltage threshold). It indicates
power supply overvoltage and is intended for connection to a protection
device such as a “crowbar” circuit.
3 3 VIN Analog Input: Voltage monitor input and power supply input to the IC.
4 /RST Reset (Digital Output): Active-low digital output. This output will be asserted
whenever V
IN
falls below V
THU
(undervoltage threshold), or rises above
V
THO
(overvoltage threshold). It will be deasserted no less than 140ms after
VIN returns within the threshold limits.
4 2 GND Ground: Ground return for all IC functions.
5 5 /MR Manual Reset (Digital Input): Logic low initiates immediate, unconditional
reset. If VIN is within tolerance thresholds, when /MR is released (returns
high), the reset output(s) will be deasserted no less than 140ms later. /MR
may be driven by a CMOS or TTL logic signal or a mechanical switch.
(Switch debouncing is performed internally.) /MR has an internal pull-up to
VIN and may remain open if unused.
Ordering Information
Part Number Mark Lower Threshold Monitored Upper Threshold Reset Temperature Package
Voltage Voltage* Voltage Range
MIC2753-RBM5 UDR 2.63V 2.85V±5% 3.08V Active High –40°C to +85°C SOT-23-5
MIC2753-SBM5 UDS 2.93V 3.3V±10% 3.83V Active High –40°C to +85°C SOT-23-5
MIC2753-TBM5 UDT 3.08V 3.3V±5% 3.53V Active High –40°C to +85°C SOT-23-5
MIC2753-MBM5 UDM 4.38V 5.0V±10% 5.81V Active High –40°C to +85°C SOT-23-5
MIC2753-LBM5 UDL 4.63V 5.0V±5% 5.38V Active High –40°C to +85°C SOT-23-5
MIC2754-RBM5 UER 2.63V 2.85V±5% 3.08V Active Low –40°C to +85°C SOT-23-5
MIC2754-SBM5 UES 2.93V 3.3V±10% 3.83V Active Low –40°C to +85°C SOT-23-5
MIC2754-TBM5 UET 3.08V 3.3V±5% 3.53V Active Low –40°C to +85°C SOT-23-5
MIC2754-MBM5 UEM 4.38V 5.0V±10% 5.81V Active Low –40°C to +85°C SOT-23-5
MIC2754-LBM5 UEL 4.63V 5.0V±5% 5.38V Active Low –40°C to +85°C SOT-23-5
* Contact factory for voltages not listed.
June 1999 3 MIC2753/2754
MIC2753/2754 Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage (VIN) ...................................... –0.3V to 10V
Reset Voltage (V
RST
) ...........................–0.3V to VIN + 0.3V
Manual Reset Voltage (VMR) ............... –0.3V to VIN + 0.3V
Reset Current (I
RST
)...................................................10mA
Continuous Power Dissipation
(PD at TA = +85°C) ..............................................200mW
Storage Temperature (TS) ....................... –65°C to +150°C
ESD Rating, Note 3
Operating Ratings (Note 2)
Supply Voltage (VIN) .......................................... 1.5V to 7V
Ambient Temperature (TA).........................–40°C to +85°C
Junction Temperature (TJ) ........................................ 150°C
Manual Reset (VMR)............................................. 0V to V
IN
Thermal Resistance
(θJA)...................................................................325°C/W
Electrical Characteristics
VIN = 5.0V (L, M voltage code), VIN = 3.3V (T, S voltage code), VIN = 2.85 (R voltage code) TA = 25°C;
bold values indicate 1.5V ≤ VIN ≤ 7.0V, –40°C ≤ TA ≤ +85°C Note 4; unless noted
Symbol Parameter Condition Min Typ Max Units
V
IN
Input Supply Voltage 1.0 7.0 V
I
DD
Operating Supply Current manual reset not asserted 30 100 µA
V
THO
Overvoltage Threshold L voltage code 5.28 5.38 6.00 V
M voltage code 5.62 5.81 6.00 V
T voltage code 3.459 3.53 3.96 V
S voltage code 3.67 3.83 3.96 V
R voltage code 3.018 3.08 3.28 V
V
THU
Undervoltage Threshold L voltage code 4.50 4.63 4.75 V
M voltage code 4.25 4.38 4.50 V
T voltage code 3.00 3.08 3.15 V
S voltage code 2.85 2.93 3.00 V
R voltage code 2.55 2.63 2.70 V
V
HYST
+ Overvoltage Threshold Hysteresis –15 mV
V
HYST
– Undervoltage Threshold Hysteresis +15 mV
t
PROP(RST)
Propagation Delay VIN = V
THO (min)
– 100mV to V
THO (max)
+ 100mV 12 30 µs
VIN = V
THU (max)
+ 100mV to V
THU (min)
– 100mV 12 30 µs
t
RST
Reset Pulse Width 140 240 560 ms
MIC2753/2754 Micrel
MIC2753/2754 4 June 1999
Symbol Parameter Condition Min Typ Max Units
V
OL(RST)
Reset Output Voltage Low R/S/T voltage codes, 0.5 V
MIC2753 VIN = V
THU(max)
+ 100mV, I
SINK
= 50µA
L/M voltage codes, 0.5 V
VIN = V
THU(max)
+ 100mV, I
SINK
= 50µA
V
OH(RST)
Reset Output Voltage High R/S/T voltage codes, V
IN
–0.5 V
MIC2753 VIN = V
THU(min)
– 100mV, I
SOURCE
= 0.5mA
L/M voltage codes, V
IN
–0.8 V
VIN = V
THU(min)
– 100mV, I
SOURCE
= 1.0mA
V
OL(RST)
/Reset Output Voltage Low R/S/T voltage codes, 0.5 V
MIC2754 VIN = V
THU(min)
– 100mV, I
SINK
= 0.5mA
L/M voltage codes, 0.8 V
VIN = V
THU(min)
– 100mV, I
SINK
= 1.0mA
VIN ≥ 1.5V, IOL = 50µA 0.5 V
V
OH(RST)
/Reset Output Voltage High R/S/T voltage codes, V
IN
–0.5 V
MIC2754 VIN = V
THU(max)
+ 100mV, I
SOURCE
= 35µA
L/M voltage codes, V
IN
–0.5 V
VIN = V
THU(max)
+ 100mV, I
SOURCE
= 35µA
V
IH(/MR)
/MR Input Voltage, High 0.8 V
IN
V
V
IL(/MR)
/MR Input Voltage, Low 0.2 V
IN
V
t
PROP(/MR)
Propagation Delay V
/MR
≤ V
IL
to V
RST
≥ V
OH
1 2 µs
MIC2753
Propagation Delay V
/MR
≤ V
IL
to V
/RST
≤ V
OL
1 2 µs
MIC2754
t
/MR(min)
/MR Minimum Input Pulse Width 2.5 µs
I
PU
Pull-Up Current, /MR V
/MR
= 0V 0.2 2 µA
I
IH
Input Current, /MR V
/MR
= V
IN
0.01 µA
V
OL(/HV)
/HV Output Voltage Low VIN > V
THO(max)
, 0.5 V
I
SINK
= 0.5mA, R/S/T voltage codes V
V
IN
> V
THO(max)
, 0.8 V
I
SINK
= 1.0mA, L/M voltage codes V
t
PROP(/HV)
/HV Propagation Delay VIN = V
THO (min)
– 100mV to V
THO (max)
+ 100mV 12 30 µs
I
/HV
/HV Leakage Current VIN = V
THO (min)
– 100mV –2 +2 µA
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.
Note 4. Final test on outgoing product is performed at TA = 25°C. Device performance over –40°C ≤ TA ≤ +85°C is guaranteed by design.
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