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 VCC rises above the designed threshold level.
LINEAR INTEGRATED CIRCUIT
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 * Fixed140ms minimum reset pulse width * With Manual reset input * Halogen Free
ORDERING INFORMATION
Ordering Number Package UIC811G-x-AD4-R SOT-143 Note: x: Output Voltage, refer to Marking Information. Packing Tape Reel
www.unisonic.com.tw Copyright © 2010 Unisonic Technologies Co., Ltd
1 of 9
QW-R502-317.D
UIC811
MARKING INFORMATION
PACKAGE VOLTAGE CODE A : 2.63V B : 2.93V C : 3.08V D: 4.00V E: 4.38V F: 5.00V
LINEAR INTEGRATED CIRCUIT
MARKING 4 UXG 1 2 3
SOT-143
Voltage Code
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO. 1 2 3 4 PIN NAME GND RESET 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
MR
VCC
low, the reset will remain asserted, and until the MR rise high, the reset will remain140ms 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 9
QW-R502-317.D
UIC811
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
VCC
4
RESET GENERATOR Reset Threshold
2
RESET
MR
3
1
GND
FUNCTIONAL DIAGRAM
VCC
VTH
MR
tRST RESET
tRST
Reset Timing Diagram
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 9
QW-R502-317.D
UIC811
ABSOLUTE MAXIMUM RATING
PARAMETER Input Voltage Input Current (VCC, MR ) Output Current ( RESET ) Rate of Rise Power Dissipation (Ta =+70°C) Operating Temperature SYMBOL VCC IIN IOUT VCC(RR) PD
LINEAR INTEGRATED CIRCUIT
RATINGS -0.3~+6.0 20 20 100 320
UNIT V mA mA V/µs mW
-40~+85 °C TOPR °C TSTG -65~+150 Storage Temperature 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 MR Minimum Pulse Width MR to Reset Delay MR Pull-Up Resistance MR Glitch Immunity
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
TYP MAX UNIT 6 V 5 10 µA 2.55 2.63 2.70 V 140 240 560 ms 2.4 V 0.3 V 0.3 V 2.1 V 0.75 V 10 µS 0.5 10 20 100 30 µS kΩ ns
MIN 1
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 MR Minimum Pulse Width MR to Reset Delay MR Pull-Up Resistance MR Glitch Immunity
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
TYP MAX UNIT 6 V 5 10 µA 2.85 2.93 3.00 V 140 240 560 ms 2.64 V 0.3 V 0.3 V 2.31 V 0.825 V 10 µS 0.5 10 20 100 30 µS kΩ ns
MIN 1
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 9
QW-R502-317.D
UIC811
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 MR Minimum Pulse Width MR to Reset Delay MR Pull-Up Resistance MR Glitch Immunity
LINEAR INTEGRATED CIRCUIT
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
TYP MAX UNIT 6 V 5 10 µA 3.00 3.08 3.15 V 140 240 560 ms 2.64 V 0.3 V 0.3 V 2.31 V 0.825 V 10 µS 0.5 10 20 100 30 µS kΩ ns
MIN 1
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 MR Minimum Pulse Width MR to Reset Delay MR Pull-Up Resistance MR Glitch Immunity
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
TYP MAX UNIT 6 V 5 15 µA 3.89 4.00 4.10 V 140 240 560 ms 3.5 V 0.4 V 0.3 V 2.3 V 0.8 V 10 µS 0.5 10 20 100 30 µS kΩ ns
MIN 1
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 MR Minimum Pulse Width MR to Reset Delay MR Pull-Up Resistance MR Glitch Immunity
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
TYP MAX UNIT 6 V 5 15 µA 4.25 4.38 4.50 V 140 240 560 ms 3.5 V 0.4 V 0.3 V 2.3 V 0.8 V 10 µS 0.5 10 20 100 30 µS kΩ ns
MIN 1
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 9
QW-R502-317.D
UIC811
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 MR Minimum Pulse Width MR to Reset Delay MR Pull-Up Resistance MR Glitch Immunity
LINEAR INTEGRATED CIRCUIT
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
TYP MAX UNIT 6 V 25 µA 4.85 5 5.15 V 140 240 560 ms 4.55 V 0.4 V 0.3 V 2.45 V 0.8 V 10 µS 0.5 10 20 100 30 µS kΩ ns
MIN 1
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 9
QW-R502-317.D
UIC811
TYPICAL APPLICATION CIRCUIT
VCC
LINEAR INTEGRATED CIRCUIT
VCC
VCC
UTC UIC811 RESET MR RESET
µP
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 9
QW-R502-317.D
UIC811
TYPICAL CHARACTERISTICS Reset Timeout out Period
LINEAR INTEGRATED CIRCUIT
Reset Timeout out Period
CH1：MR CH2：Reset
CH1：Vcc CH2：Reset
MR to Reset Delay
CH1：MR CH2：Reset
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
8 of 9
QW-R502-317.D
UIC811
LINEAR INTEGRATED 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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
9 of 9
QW-R502-317.D
