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 1 of 5 Ver.A UTC812 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 2 of 5 Ver.A UTC812 CMOS IC BLOCK DIAGRAM VCC + - Delay Circuit RESET VREF GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 5 Ver.A UTC812 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 4 of 5 Ver.A UTC812 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 5 of 5 Ver.A