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MIC2774
Dual Micro-Power Low Voltage Supervisor
General Description
The MIC2774 is a dual power supply supervisor that pro-
vides under-voltage monitoring, manual reset capability, and
power-on reset generation in a compact 5-pin SOT package.
Features include two under-voltage detectors, one fixed and
one adjustable, and a choice of reset outputs. One under-
voltage detector compares V
DD
against a fixed threshold. Ten
factory-programmed thresholds are available. The second,
user-adjustable input is compared against a 300mV reference.
This low reference voltage allows monitoring voltages lower
than those supported by previous supervisor ICs.
The reset outputs are asserted at power-on and any time
either voltage drops below the programmed threshold volt-
ages and remains asserted for 140ms (min.) after they
subsequently rise back above the threshold boundaries.
Manual reset functionality can be provided by a switch con-
nected between ground and the /MR input. A wide choice of
voltage thresholds provides for a variety of supply voltages
and tolerances. Hysteresis is included to prevent chattering
due to noise. Typical supply current is a low 3.5µA.
Features
• Monitors two independent power supplies for under-volt-
age conditions
• One fixed and one user adjustable input
• Choice of factory-programmed thresholds
• Adjustable input can monitor supplies as low as 0.3V
• Generates 140ms (minimum) power-on reset pulse
• Manual reset input
• Choice of active-high, active-low, or open-drain active-
low reset outputs
• Inputs may be pulled above V
DD
(7V abs. max.)
• Open-drain output can be pulled above V
DD
(7V abs
max.)
• /RST output valid down to 1.2V
• Ultra-low supply current, 3.5µA typical
• Rejects brief input transients
• IttyBitty™ 5-lead SOT-23 package
• Pin compatible upgrade for MAX6306/09/12
Applications
• Monitoring processor ASIC, or FAGA core and I/O volt-
ages
• PDAs, hand-held PCs
• Embedded controllers
• Telecommunications systems
• Power supplies
• Wireless / Cellular systems
• Networking hardware
Reset Output
Temperature
Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Package
SOT-23-5
SOT-23-5
SOT-23-5
Ordering Information
Part Number
Standard
MIC2774N-XXBM5
MIC2774H-XXBM5
MIC2774L-XXBM5
Notes:
1.
Marking
UGXX
(1)
UHXX
(1)
UIXX
(1)
Pb-Free
MIC2774N-XXYM5
MIC2774H-XXYM5
MIC2774L-XXYM5
Marking
UGXX
(1)
UHXX
(1)
UIXX
(1)
Open-Drain. Active-Low (/RST)
Active-High. Complementary (RST)
Active-Low. Complementary (/RST)
XX = Voltage options, see table on page 2. Underscore indicates a Pb-Free part.
Typical Application
V
CORE
1.0V
V
I/O
2.5V
R1
R2
Power_Good
er_
er_G
Manual
Reset
ese
eset
IttyBitty™ is a trademark of Micrel, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
MICROPROCESSOR
OCESSO
OCESSOR
VCORE
VI/O
MIC2774L-23
/RST
VDD
IN
/RESET
GND
/MR
GND
October 2005
1
M9999-102605
MIC2774
Micrel
Standard Voltage Options*
Voltage
Code
46
44
31
29
28
26
25
23
22
17
Typical
Application (V
DD
)
5.0V ±5%
5.0V ±10%
3.3V ±5%
3.3V ±10%
3.0V ±5%
2.85V ±5%
2.70V ±5%
2.5V ±5%
2.4V ±5%
1.8V ±5%
Nominal Threshold
Voltage (V
TH
)
4.68
4.43
3.09
2.93
2.81
2.67
2.53
2.34
2.25
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
/MR GND RST
3
2
1
/MR GND /RST
3
2
1
4
5
IN
VDD
4
5
IN
VDD
SOT-23-5 (M5)
“H” Version
SOT-23-5 (M5)
“L” and “N” Version
Pin Description
Pin Number
MIC2774H
1
Pin Number
MIC2774L
MIC2774N
Pin Name
Pin Function
RST
Digital (Output): Asserted high whenever V
IN
or V
DD
falls below the threshold
voltage. It will remain asserted for no less than 140ms after V
IN
and V
DD
return above the threshold limits.
Digital (Output): Asserted low whenever V
IN
or V
DD
falls below the threshold
voltage. It will remain asserted for no less than 140ms after V
IN
and V
DD
return above the threshold limits. (open-drain for “N” version)
Ground
Digital (Input): Driving this pin low initiates immediate and unconditional re-
set. Assuming V
IN
and V
DD
are above the thresholds 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.
Analog (Input): The voltage on this pin is compared to the internal 300mV
reference. An under-voltage condition will trigger a reset sequence.
1
/RST
2
3
2
3
GND
/MR
4
5
4
5
IN
VDD
Analog (Input): Power supply input for internal circuitry and input to the fixed
voltage monitor. The voltage on this pin is compared against the internal
reference. An undervoltage condition will trigger a reset sequence.
M9999-102605
2
October 2005
MIC2774
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
DD
).......................................–0.3V to +7V
Input Voltages (V
IN
, V
/MR
) ...............................–0.3V to +7V
Output Voltages (V
/RST
, V
RST
) .........................–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
Symbol
I
DD
Parameter
Condition
Supply Current
Note 5;
T
A
= +25°C,
bold
values indicate –40°C ≤ T
A
≤ +85°C; unless noted
;
V
DD
= V
IN
= V
TH
+1.6%,
Note 5;
/MR, RST, /RST open
5
Min
Typ
3.5
Max
Units
µA
VDD VOLTAGE THRESHOLD
Under-Voltage Threshold On V
DD
(See Standard Voltage Options Table)
V
HYST
V
REF
I
IN
Hysteresis Voltage
Under-Voltage Threshold
Hysteresis Voltage
Input Current
T
MIN
≤ T
A
≤ T
MAX
V
IN
= (V
REF(MAX)
+ 100mV) to
V
IN
= (V
REF(MIN)
– 100mV), /MR = open;
I
SINK
= 1.6mA;
V
DD
≥ 1.6V
T
MIN
≤ T
A
≤ T
MAX
Note 5
295
IN, UNDER-VOLTAGE DETECTOR INPUT
300
3
5
10
305
mV
mV
pA
nA
µs
280
0.3
0.3
0.8V
DD
0.8V
DD
ms
V
V
V
V
V
HYST
V
TH
–1.5%
V
TH
1
V
TH
+1.5%
V
%
RST, /RST OUTPUTS
t
PROP
t
RST
V
OL
Propagation Delay
Reset Pulse Width
RST or /RST Output Voltage Low
20
140
V
OH
RST or /RST Output Voltage High
(H and L Version Only)
I
SOURCE
= 500µA;
V
DD
≥ 1.5V
I
SINK
= 100µA;
V
DD
≥ 1.2V;
Note 4
/MR INPUTS
V
IH
V
IL
t
PROP
t
MIN
I
PU
I
IN
Input High Voltage
Input Low Voltage
Propagation Delay
Minimum Input Pulse Width
Internal Pull-up Current
Input Current, /MR
I
SOURCE
= 10µA;
V
DD
≥ 1.2V;
Note 4
Note 5
Note 5
V
/MR
< (V
IL
–100mV);
Note 5
Reset Occurs, V
/MR
< V
IL
0.7V
DD
5
33
100
100
V
0.3V
DD
V
µs
ns
250
250
nA
nA
V
IM
= 0V
V
/MR
< V
IL
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
V
DD
operating range is 1.5V to 5.5V. Output is guaranteed to be asserted down to V
DD
= 1.2V.
V
DD
equals nominal “Typical Application (V
DD
)” as shown in “Standard Voltage Options Table.”
October 2005
3
M9999-102605
MIC2774
Micrel
V
DD
0V
V
IN
0V
V
/MR
V
IH
V
IL
V
OH
V
OL
V
OH
V
OL
Propagation delays not shown for clarity.
Note A.
The MIC2774 ignores very brief transients.
See “Applications Information” for details.
Timing Diagram
V
HYST
A
V
TH
A
V
HYST
V
REF
> t
MIN
A
t
RST
t
RST
t
RST
V
/RST
(ACTIVE LOW)
V
RST
(ACTIVE HIGH)
M9999-102605
4
October 2005
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