UNISONIC TECHNOLOGIES CO., LTD UIC811 CMOS IC 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 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: 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. www.unisonic.com.tw Copyright © 2012 Unisonic Technologies Co., Ltd Package Packing SOT-143 SOT-23-3 SOT-23 Tape Reel Tape Reel Tape Reel 1 of 8 QW-R502-317.H UIC811 CMOS IC MARKING INFORMATION PACKAGE VOLTAGE CODE MARKING 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 VCC SOT-23/SOT-23-3 PIN DESCRIPTION PIN NO. SOT-23 SOT-143 SOT-23-3 3 1 PIN NAME GND 2 2 RESET - 3 MR 1 4 VCC DESCRIPTION Ground This pin will fall low after the VCC’s falling below the reset threshold voltage and it also can remain asserted for at least 140ms min after VCC’s rising upon the reset threshold. Input of manual reset. A reset can be forced by a logic low on MR . As the MR 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 8 QW-R502-317.H UIC811 CMOS IC BLOCK DIAGRAM 4 VCC 2 RESET 1 GND RESET GENERATOR Reset Threshold MR 3 FUNCTIONAL DIAGRAM VCC VTH MR tRST tRST RESET Reset Timing Diagram UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 8 QW-R502-317.H UIC811 CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL VCC IIN Input Voltage Input Current (VCC, MR ) RATINGS -0.3~+6.0 20 UNIT V mA 20 mA IOUT Output Current ( RESET ) Rate of Rise VCC(RR) 100 V/µs 320 Power Dissipation SOT-143 PD mW (TA =+70°C) SOT-23/ SOT-23-3 300 Operating Temperature TOPR -40~+105 °C Storage Temperature TSTG -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) (VCC =3V, TA = 25°C, unless otherwise specified) PARAMETER Operating Voltage Range Supply Current Reset Voltage Threshold Reset Timeout Period Reset Output Voltage MR Input Threshold SYMBOL TEST CONDITIONS VCC TA =-40~+85°C ICC VCC=3.0V, no load VTH tRST VOH ISOURCE =500µA VCC = VTH min, ISINK =1.2mA VOL VCC>1V, ISINK =50µA, TA =-40~+85°C VIH VIL MIN 1 2.55 140 2.4 2.1 10 MR Minimum Pulse Width 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 MR to Reset Delay 10 MR Pull-Up Resistance 20 µS 30 100 MR Glitch Immunity kΩ ns UIC811-B (2.93V) (VCC =3.3V, TA= 25°C, unless otherwise specified) PARAMETER Operating Voltage Range Supply Current Reset Voltage Threshold Reset Timeout Period Reset Output Voltage MR Input Threshold SYMBOL TEST CONDITIONS VCC TA =-40~+85°C ICC VCC=3.3V, no load VTH tRST VOH ISOURCE =500µA VCC = VTH min, ISINK =1.2mA VOL VCC>1V, ISINK =50µA, TA =-40~+85°C VIH VIL MR Minimum Pulse Width MIN 1 2.85 140 2.64 2.31 10 0.5 MR to Reset Delay MR Pull-Up Resistance MR Glitch Immunity UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 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 10 20 100 µS 30 kΩ ns 4 of 8 QW-R502-317.H UIC811 CMOS IC ELECTRICAL CHARACTERISTICS(Cont.) UIC811-C (3.08V) (VCC =3.3V, TA= 25°C, unless otherwise specified) PARAMETER Operating Voltage Range Supply Current Reset Voltage Threshold Reset Timeout Period Reset Output Voltage MR Input Threshold SYMBOL TEST CONDITIONS VCC TA =-40~+85°C ICC VCC=3.3V, no load VTH tRST VOH ISOURCE =500µA VCC = VTH min, ISINK =1.2mA VOL VCC>1V, ISINK =50µA, TA =-40~+85°C VIH VIL MIN 1 3.00 140 2.64 2.31 10 MR Minimum Pulse Width 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 MR to Reset Delay 10 MR Pull-Up Resistance 20 µS 30 100 MR Glitch Immunity kΩ ns UIC811-D (4.00V) (VCC =5V, TA= 25°C, unless otherwise specified) PARAMETER Operating Voltage Range Supply Current Reset Voltage Threshold Reset Timeout Period Reset Output Voltage MR Input Threshold SYMBOL TEST CONDITIONS VCC TA =-40~+85°C ICC VCC=5.0V, no load VTH tRST ISOURCE =800µA VOH VCC = VTH min, ISINK =3.2mA VOL VCC>1V, ISINK =50µA, TA =-40~+85°C VIH VIL MIN 1 3.89 140 3.5 2.3 10 MR Minimum Pulse Width 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 MR to Reset Delay 10 MR Pull-Up Resistance 20 µS 30 100 MR Glitch Immunity kΩ ns UIC811-E (4.38V) (VCC =5V, TA= 25°C, unless otherwise specified) PARAMETER Operating Voltage Range Supply Current Reset Voltage Threshold Reset Timeout Period Reset Output Voltage MR Input Threshold SYMBOL TEST CONDITIONS VCC TA =-40~+85°C ICC VCC=5.0V, no load VTH tRST VOH ISOURCE =800µA VCC = VTH min, ISINK =3.2mA VOL VCC>1V, ISINK =50µA, TA =-40~+85°C VIH VIL MR Minimum Pulse Width MIN 1 4.25 140 3.5 2.3 10 0.5 MR to Reset Delay MR Pull-Up Resistance MR Glitch Immunity UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 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 10 20 100 µS 30 kΩ ns 5 of 8 QW-R502-317.H UIC811 CMOS IC ELECTRICAL CHARACTERISTICS(Cont.) UIC811-F (5.0V) (VCC =5.5V, TA= 25°C, unless otherwise specified) PARAMETER Operating Voltage Range Supply Current Reset Voltage Threshold Reset Timeout Period Reset Output Voltage MR Input Threshold SYMBOL TEST CONDITIONS VCC TA =-40~+85°C ICC VCC=5.0V, no load VTH tRST VOH ISOURCE =800µA VCC = VTH min, ISINK =3.2mA VOL VCC>1V, ISINK =50µA, TA =-40~+85°C VIH VIL MR Minimum Pulse Width MIN 1 4.85 140 4.55 2.45 10 0.5 MR to Reset Delay MR Pull-Up Resistance MR Glitch Immunity UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TYP MAX UNIT 6 V 25 µA 5 5.15 V 240 560 ms V 0.4 V 0.3 V V 0.8 V µS 10 20 100 µS 30 kΩ ns 6 of 8 QW-R502-317.H UIC811 CMOS IC TYPICAL APPLICATION CIRCUIT VCC VCC VCC UTC UIC811 µP RESET RESET MR APPLICATION INFORMATION Microprocessor Reset As soon as VCC falls below the reset threshold voltage, the RESET pin is asserted. But the RESET pin can keep asserted for a period of 140ms after VCC rose above the reset threshold voltage. After a power failure the reset operation can keep the processor being reset and powers up properly. VCC Transients The UTC UIC811 series won’t cause a reset typically as this situation: a negative-going transient 125mV below the reset threshold with a duration of 20µs or less. Interfacing to Bidirectional Reset Pins Connecting a 4.7kΩ resistor in series with the UTC UIC811 series output and the µP reset pin can make the UTC UIC811 series interface with µPs with bidirectional reset pins. RESET Valid at Low Voltage As the figure below, adding a resistor which is recommended 100kΩ can ensure the RESET output remains low with VCC down to 0V. The size of the resistor should be not too large which will load the output excessively and not too small which can pull-down any stray leakage currents. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 8 QW-R502-317.H UIC811 CMOS IC TYPICAL CHARACTERISTICS Reset Timeout out Period Reset Timeout out Period CH1：MR CH1：VCC CH2：Reset CH2：Reset MR to Reset Delay CH1：MR CH2：Reset 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 8 of 8 QW-R502-317.H