Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UIC813
Preliminary
CMOS IC
3-PIN MICROPROCESSOR
RESET CIRCUITS

DESCRIPTION
The UTC UIC813 series are resetting circuits which can monitor
power supplies especially in microprocessor based systems.
In normal operation, the UTC UIC813 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).
There is an internal active high RESET output which has
already been guaranteed to remain asserted for at 140ms least
while VCC rises above the designed threshold level.

FEATURES
* Voltage monitor for 3V or 3.3V or 5V power supplies
* Valid RESET remains with VCC as low as 1V
* Typical supply current: 10µA
* Fixed 140ms minimum reset pulse width
* Push-Pull Reset Active High Optput.

ORDERING INFORMATION
Ordering Number
Note:
Package
UIC813G-x-AE3-5-R
SOT-23
x: Output Voltage, refer to Marking Information.
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1
GND
Pin Assignment
2
RESET
3
VCC
Packing
Tape Reel
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Preliminary
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
3
SOT23
A: 2.63V
B: 2.93V
C: 3.08V
D: 4.00V
E: 4.38V
F: 4.63V

PIN CONFIGURATION

PIN DESCRIPTION
PIN NO.
1
2
3

CMOS IC
PIN NAME
GND
RESET
VCC
3V
Voltage Code
2
Pin Code
1
DESCRIPTION
Ground
Reset Output Pin
Input of power supply
BLOCK DIAGRAM
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UIC813

Preliminary
CMOS IC
FUNCTIONAL DIAGRAM
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UIC813
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Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
-0.3~+6.0
V
RESET (push-pull)
VRESET
-0.3~(VCC+0.3)
V
Input Current, VCC
ICC
20
mA
Output Current, RESET
IOUT
20
mA
Rate of Rise
VCC(RR)
100
V/µs
Continuous Power Dissipation (TA=+70°C),
PD
360
mW
De-rate 4mW/°C Above +70°C
Operating Junction Temperature Range
TOPR
-40~+105
°C
Storage Temperature Range
TSTG
-65~+150
°C
Note: 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.

ELECTRICAL CHARACTERISTICS
(TA=-40~85°C unless otherwise note. Typical values are at TA=+25°C) (Note 1)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VCC Range
VCC
TA=0°C~+70°C
1.0
5.5
V
Supply Current
ICC
VTH+0.2V
10
30
μA
VCC=3V
UIC813-A
2.59
2.63
2.69
UIC813-B
2.88
2.93
3.00
VCC=3.3V
UIC813-C
3.02
3.08
3.15
V
Reset Threshold
VTH
UIC813-D
3.93
4.00
4.08
VCC=5V
UIC813-E
4.31
4.38
4.47
UIC813-F
4.54
4.63
4.72
Reset Threshold Tempco
VTH
30
ppm/°C
Set-up Time
TS
VCC=VTH~(VTH-100mV)
20
μs
Reset Active Timeout Period
tRST
TA=0°C~+85°C
140
320
560
ms
VCC=VTH+0.2, ISINK=1.2mA
0.3
V
RESET Output Voltage-Low
VOL
0.4
VCC=VTH+0.2, ISINK=3.2mA
RESET Output Voltage-High
VOH
1.8V<VCC<VTH-0.2, ISOURCE=150uA 0.8×VCC
V
Notes: 1. Production testing done at TA=+25°C; limits over temperature guaranteed by design.
2. Devices mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout.
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
Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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