Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UTC812
CMOS IC
MICROPROCESSOR RESET IC
„
DESCRIPTION
The UTC UTC812 is a microprocessor (µP) reset circuit designed
to monitor the power supplies in µP and digital systems.
The UTC UTC812 has push-pull output and active-low RESET
output.
This device provides customers with perfect system reliability and
low cost which are achieved by to no external component
requirement and adjustments when used with +5V, +3.3V, +3.0Vpowered circuits.
This circuit performs a single function: it asserts a reset signal
whenever the VCC supply voltage declines below a preset threshold,
keeping it asserted for at least 140ms after VCC has risen above the
reset threshold. Reset thresholds suitable for operation with a variety
of supply voltages are available.
The reset comparator can be used to ignore fast transients on
VCC, and outputs are guaranteed to be in the correct logic state for
VCC down to 1V.
In applications, the UTC812 is suitable for computers, controllers,
intelligent instruments, critical microprocessors, microcomputer
power monitoring, portable, or battery-powered equipments and
automotive device.
„
FEATURES
* Supply Current: 10µA
* Precision Monitoring of +5V, +3.3V, +3.0V Powered Circuits
* With the Two Configurations In The Following:
Push-Pull RESET Output
* Power-On Reset Pulse Width: 140ms (MIN.)
* Outputs Guaranteed To Be In The Correct Logic State for VCC
Down to 1V.
* Required No External Components
* Power Supply Transient Immunity
„
ORDERING INFORMATION
Ordering Number
UTC812G-X-AE2-R
Package
SOT-23-3
Packing
Tape Reel
UTC812G-X-AE2-R
(1)Packing Type
(2)Package Type
(3)Output Voltage Code
(4)Halogen Free
www.unisonic.com.tw
Copyright © 2010 Unisonic Technologies Co., Ltd
(1) R: Tape Reel
(2) AE2: SOT-23-3
(3) Refer to Marking Information
(4) G: Halogen Free
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UTC812
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CMOS IC
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
3
SOT-23-3
812 G
C : 3.08 V
2
„
Voltage Code
1
PIN CONFIGURATION
VCC
3
„
2
1
RESET
GND
PIN DESCRIPTION
PIN NO.
1
PIN NAME
GND
2
RESET
3
VCC
123
DESCRIPTION
IC Ground Pin
RESET goes low if Vcc falls below the reset threshold and remains asserted for one
reset timeout period after Vcc exceeds the reset threshold.
Power Supply Input
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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UTC812
„
CMOS IC
BLOCK DIAGRAM
VCC
+
-
Delay Circuit
RESET
VREF
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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UTC812
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CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Terminal Voltage (with respect to GND)
VCC
-0.3~6.0
V
RESET, RESET (push-pull)
-0.3~(VCC+0.3)
V
Input Current
VCC
20
mA
Output Current, RESET, RESET
20
mA
Junction Temperature
TJ
150
°C
Operating Temperature
TOPR
-40~105
°C
Storage Temperature
TSTG
-65~150
°C
Notes: 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.
„
THERMAL DATA
PARAMETER
Junction to Ambient
„
SYMBOL
θJA
RATINGS
420
UNIT
°C/W
ELECTRICAL CHARACTERISTICS (Note 1) (TA = 25℃, VCC= 3.3V, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
VCC Range
1.0
Supply Current
ICC
VCC<3.6V
Reset Threshold
VTH
3.03
Reset Threshold Tempco
VCC to Reset Delay (Note 2)
VCC= VTH to (VTH– 100mV)
Reset Active Timeout Period
VCC= VTH max
150
RESET Output Current High
IOH
3
VCC= 3.3V, VRESET = 2.8V
(push-pull active low)
Notes: 1. Production testing done at TA = +25°C; limits over temperature guaranteed by design
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TYP
10
3.08
40
7
MAX
5.5
23
3.12
550
UNIT
V
μA
V
ppm/°C
μs
ms
mA
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UTC812
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CMOS IC
TYPICAL APPLICATION CIRCUIT
VCC
VCC
VCC
UTC 812
µP
RESET
GND
RESET
INPUT
GND
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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