UNISONIC TECHNOLOGIES CO., LTD
UIC811
MICROPROCESSOR RESET
CIRCUITS
DESCRIPTION
The UTC
UIC811
series are resetting circuits which can
monitor power supplies especially in microprocessor based
systems.
In normal operation, the UTC
UIC811
series can assert a reset
under any of the following situation: the power supply drops below
a designated reset threshold level (which is available for 3V or 3.3V
or 5V system) or
MR
is forced low.
There is an internal active low RESET output which has
already been guaranteed to remain asserted for at 140ms least
while V
CC
rises above the designed threshold level.
CMOS IC
FEATURES
* Voltage monitor for 3V or 3.3V or 5V power supplies
* Valid RESET remains with V
CC
as low as 1V
* Typical supply current: 5µA
* Fixed 140ms minimum reset pulse width
* With Manual reset input
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UIC811L-x-AD4-R
UIC811G-x-AD4-R
UIC811L-x-AE2-R
UIC811G-x-AE2-R
UIC811L-x-AE3-R
UIC811G-x-AE3-R
Note: x: Output Voltage, refer to Marking Information.
Package
SOT-143
SOT-23-3
SOT-23
Packing
Tape Reel
Tape Reel
Tape Reel
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QW-R502-317.H
UIC811
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
CMOS IC
SOT-143
A : 2.63V
B : 2.93V
C : 3.08V
D: 4.00V
E: 4.38V
F: 5.00V
SOT-23
SOT-23-3
PIN CONFIGURATION
GND
3
2
RESET
SOT-143
1
V
CC
SOT-23/SOT-23-3
PIN DESCRIPTION
PIN NO.
SOT-23
SOT-143
SOT-23-3
3
1
2
2
PIN
NAME
GND
RESET
DESCRIPTION
Ground
This pin will fall low after the V
CC
’s falling below the reset threshold voltage and
it also can remain asserted for at least 140ms min after V
CC
’s rising upon the
reset threshold.
Input of manual reset. A reset can be forced by a logic low on
MR
. As the
MR
-
1
3
4
MR
V
CC
is held low, the reset will remain asserted, and until the
MR
rise high, the
reset will remain 140ms min at least. When it is float that means it is unused.
Input of power supply.
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QW-R502-317.H
UIC811
BLOCK DIAGRAM
CMOS IC
V
CC
4
RESET
GENERATOR
Reset
Threshold
2
RESET
MR
3
1
GND
FUNCTIONAL DIAGRAM
V
CC
V
TH
MR
t
RST
RESET
t
RST
Reset Timing Diagram
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UIC811
ABSOLUTE MAXIMUM RATING
PARAMETER
Input Voltage
Input Current (V
CC
,
MR
)
SYMBOL
V
CC
I
IN
RATINGS
-0.3~+6.0
20
CMOS IC
UNIT
V
mA
20
mA
I
OUT
Output Current ( RESET )
Rate of Rise
V
CC(RR)
100
V/µs
320
Power Dissipation SOT-143
P
D
mW
(T
A
=+70°C)
SOT-23/ SOT-23-3
300
Operating Temperature
T
OPR
-40~+105
°C
Storage Temperature
T
STG
-65~+150
°C
Note: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. The device is not guaranteed to function outside its operating rating.
ELECTRICAL CHARACTERISTICS
UIC811-A (2.63V)
(V
CC
=3V, T
A
= 25°C, unless otherwise specified)
PARAMETER
Operating Voltage Range
Supply Current
Reset Voltage Threshold
Reset Timeout Period
Reset Output Voltage
MR
Input Threshold
MR
Minimum Pulse Width
MR
to Reset Delay
MR
Pull-Up Resistance
MR
Glitch Immunity
SYMBOL
TEST CONDITIONS
V
CC
T
A
=-40~+85°C
I
CC
V
CC
=3.0V, no load
V
TH
t
RST
V
OH
I
SOURCE
=500µA
V
CC
= V
TH
min, I
SINK
=1.2mA
V
OL
V
CC
>1V,
I
SINK
=50µA, T
A
=-40~+85°C
V
IH
V
IL
MIN
1
2.55
140
2.4
2.1
10
10
TYP MAX UNIT
6
V
5
10
µA
2.63 2.70
V
240 560 ms
V
0.3
V
0.3
V
V
0.75
V
µS
0.5
20
100
30
µS
kΩ
ns
UIC811-B (2.93V)
(V
CC
=3.3V, T
A
= 25°C, unless otherwise specified)
PARAMETER
Operating Voltage Range
Supply Current
Reset Voltage Threshold
Reset Timeout Period
Reset Output Voltage
MR
Input Threshold
MR
Minimum Pulse Width
MR
to Reset Delay
MR
Pull-Up Resistance
MR
Glitch Immunity
SYMBOL
TEST CONDITIONS
V
CC
T
A
=-40~+85°C
I
CC
V
CC
=3.3V, no load
V
TH
t
RST
V
OH
I
SOURCE
=500µA
V
CC
= V
TH
min, I
SINK
=1.2mA
V
OL
V
CC
>1V,
I
SINK
=50µA, T
A
=-40~+85°C
V
IH
V
IL
MIN
1
2.85
140
2.64
2.31
10
10
TYP MAX UNIT
6
V
5
10
µA
2.93 3.00
V
240 560 ms
V
0.3
V
0.3
V
V
0.825 V
µS
0.5
20
100
30
µS
kΩ
ns
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UIC811
ELECTRICAL CHARACTERISTICS(Cont.)
UIC811-C (3.08V)
(V
CC
=3.3V, T
A
= 25°C, unless otherwise specified)
PARAMETER
Operating Voltage Range
Supply Current
Reset Voltage Threshold
Reset Timeout Period
Reset Output Voltage
MR
Input Threshold
MR
Minimum Pulse Width
MR
to Reset Delay
MR
Pull-Up Resistance
MR
Glitch Immunity
CMOS IC
SYMBOL
TEST CONDITIONS
V
CC
T
A
=-40~+85°C
I
CC
V
CC
=3.3V, no load
V
TH
t
RST
V
OH
I
SOURCE
=500µA
V
CC
= V
TH
min, I
SINK
=1.2mA
V
OL
V
CC
>1V,
I
SINK
=50µA, T
A
=-40~+85°C
V
IH
V
IL
MIN
1
3.00
140
2.64
2.31
10
10
TYP MAX UNIT
6
V
5
10
µA
3.08 3.15
V
240 560 ms
V
0.3
V
0.3
V
V
0.825 V
µS
0.5
20
100
30
µS
kΩ
ns
UIC811-D (4.00V)
(V
CC
=5V, T
A
= 25°C, unless otherwise specified)
PARAMETER
Operating Voltage Range
Supply Current
Reset Voltage Threshold
Reset Timeout Period
Reset Output Voltage
MR
Input Threshold
MR
Minimum Pulse Width
MR
to Reset Delay
MR
Pull-Up Resistance
MR
Glitch Immunity
SYMBOL
TEST CONDITIONS
V
CC
T
A
=-40~+85°C
I
CC
V
CC
=5.0V, no load
V
TH
t
RST
I
SOURCE
=800µA
V
OH
V
CC
= V
TH
min, I
SINK
=3.2mA
V
OL
V
CC
>1V,
I
SINK
=50µA, T
A
=-40~+85°C
V
IH
V
IL
MIN
1
3.89
140
3.5
2.3
10
10
TYP MAX UNIT
6
V
5
15
µA
4.00 4.10
V
240 560 ms
V
0.4
V
0.3
V
V
0.8
V
µS
0.5
20
100
30
µS
kΩ
ns
UIC811-E (4.38V)
(V
CC
=5V, T
A
= 25°C, unless otherwise specified)
PARAMETER
Operating Voltage Range
Supply Current
Reset Voltage Threshold
Reset Timeout Period
Reset Output Voltage
MR
Input Threshold
MR
Minimum Pulse Width
MR
to Reset Delay
MR
Pull-Up Resistance
MR
Glitch Immunity
SYMBOL
TEST CONDITIONS
V
CC
T
A
=-40~+85°C
I
CC
V
CC
=5.0V, no load
V
TH
t
RST
V
OH
I
SOURCE
=800µA
V
CC
= V
TH
min, I
SINK
=3.2mA
V
OL
V
CC
>1V,
I
SINK
=50µA, T
A
=-40~+85°C
V
IH
V
IL
MIN
1
4.25
140
3.5
2.3
10
10
TYP MAX UNIT
6
V
5
15
µA
4.38 4.50
V
240 560 ms
V
0.4
V
0.3
V
V
0.8
V
µS
0.5
20
100
30
µS
kΩ
ns
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