June 1999
1
MIC2753/2754
MIC2753/2754
Micrel
MIC2753/2754
Power Supply Supervisors
Final Information
General Description
The MIC2753 and MIC2754 are ultraminiature, full-featured,
power supply supervisors featuring active-high and active-
low 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 30
A.
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 (mini-
mum) 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
HV
MR
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 30
A typical supply current
No external components needed
IttyBittyTM 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
MR
GND
VIN
UDx
1
3
4
5
2
HV
HV
MR
RST
VIN
UEx
1
3
4
5
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 V
IN
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
V
IN
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 V
IN
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 (V
IN
) ...................................... 0.3V to 10V
Reset Voltage (V
RST
) ........................... 0.3V to V
IN
+ 0.3V
Manual Reset Voltage (V
MR
) ............... 0.3V to V
IN
+ 0.3V
Reset Current (I
RST
) ................................................... 10mA
Continuous Power Dissipation
(P
D
at T
A
= +85
C) .............................................. 200mW
Storage Temperature (T
S
) ....................... 65
C to +150
C
ESD Rating, Note 3
Operating Ratings
(Note 2)
Supply Voltage (V
IN
) .......................................... 1.5V to 7V
Ambient Temperature (T
A
) ......................... 40
C to +85
C
Junction Temperature (T
J
) ........................................ 150
C
Manual Reset (V
MR
) ............................................. 0V to V
IN
Thermal Resistance
(
JA
) ................................................................... 325
C/W
Electrical Characteristics
V
IN
= 5.0V (L, M voltage code), V
IN
= 3.3V (T, S voltage code), V
IN
= 2.85 (R voltage code) T
A
= 25
C;
bold values indicate 1.5V
V
IN
7.0V, 40
C
T
A
+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
A
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
V
IN
= V
THO (min)
100mV to V
THO (max)
+ 100mV
12
30
s
V
IN
= V
THU (max)
+ 100mV to V
THU (min)
100mV
12
30
s
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
V
IN
= V
THU(max)
+ 100mV, I
SINK
= 50
A
L/M voltage codes,
0.5
V
V
IN
= V
THU(max)
+ 100mV, I
SINK
= 50
A
V
OH(RST)
Reset Output Voltage High
R/S/T voltage codes,
V
IN
0.5
V
MIC2753
V
IN
= V
THU(min)
100mV, I
SOURCE
= 0.5mA
L/M voltage codes,
V
IN
0.8
V
V
IN
= V
THU(min)
100mV, I
SOURCE
= 1.0mA
V
OL(RST)
/Reset Output Voltage Low
R/S/T voltage codes,
0.5
V
MIC2754
V
IN
= V
THU(min)
100mV, I
SINK
= 0.5mA
L/M voltage codes,
0.8
V
V
IN
= V
THU(min)
100mV, I
SINK
= 1.0mA
V
IN
1.5V, I
OL
= 50
A
0.5
V
V
OH(RST)
/Reset Output Voltage High
R/S/T voltage codes,
V
IN
0.5
V
MIC2754
V
IN
= V
THU(max)
+ 100mV, I
SOURCE
= 35
A
L/M voltage codes,
V
IN
0.5
V
V
IN
= V
THU(max)
+ 100mV, I
SOURCE
= 35
A
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
s
MIC2753
Propagation Delay
V
/MR
V
IL
to V
/RST
V
OL
1
2
s
MIC2754
t
/MR(min)
/MR Minimum Input Pulse Width
2.5
s
I
PU
Pull-Up Current, /MR
V
/MR
= 0V
0.2
2
A
I
IH
Input Current, /MR
V
/MR
= V
IN
0.01
A
V
OL(/HV)
/HV Output Voltage Low
V
IN
> 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
V
IN
= V
THO (min)
100mV to V
THO (max)
+ 100mV
12
30
s
I
/HV
/HV Leakage Current
V
IN
= V
THO (min)
100mV
2
+2
A
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 T
A
= 25
C. Device performance over 40
C
T
A
+85
C is guaranteed by design.
June 1999
5
MIC2753/2754
MIC2753/2754
Micrel
Typical Characteristics
0
20
40
60
80
100
-40 -20
0
20
40
60
80 100
SUPPLY CURRENT (
A)
TEMPERATURE (
C)
Supply Current
vs. Temperature
1V
3V
4V
5V
2V
V
IN
= 6V
No Load; L, M
voltage codes
0
1
2
3
4
5
6
7
8
9
10
-40 -20
0
20
40
60
80 100
RESET DELAY (
s)
TEMPERATURE (
C)
Power-Down Reset Delay
vs. Temperature
L, M voltage codes
150
200
250
300
-40 -20
0
20
40
60
80 100
RESET PULSE WIDTH (ms)
TEMPERATURE (
C)
Power-Up Reset Timeout
vs. Temperature
0.990
0.995
1.000
1.005
1.010
-40 -20
0
20
40
60
80 100
NORMALIZED THRESHOLD
TEMPERATURE (
C)
Normalized Reset Threshold
vs. Temperature
20
25
30
35
40
45
50
-40 -20
0
20
40
60
80 100
RESET DELAY (ns)
TEMPERATURE (
C)
Manual Reset Delay
vs. Temperature
L, M voltage codes
0
10
20
30
40
-40 -20
0
20
40
60
80 100
OVERVOLTAGE DELAY (
s)
TEMPERATURE (
C)
Overvoltage Delay
vs. Temperature
10mV
20mV
100mV
Overdrive = 200mV
L, M voltage codes
0
10
20
30
40
50
-40 -20
0
20
40
60
80 100
UNDERVOLTAGE DELAY (
s)
TEMPERATURE (
C)
Undervoltage Delay
vs. Temperature
20mV
Overdrive = 10mV
L, M voltage codes
0.990
0.995
1.000
1.005
1.010
-40 -20
0
20
40
60
80 100
THRESHOLD
TEMPERATURE (
C)
Normalized Overvoltage
Threshold vs. Temperature
20
60
100
140
180
220
260
300
-40 -20
0
20
40
60
80 100
PULL-UP CURRENT (nA)
TEMPERATURE (C)
MR Pull-up Current
vs. Temperature
2.85V
3.3V
5.0V
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