System Reset IC with delay Monolithic IC PST89XB Series
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1 System Reset IC with delay Monolithic IC 89XB Series Outline This IC is a reset IC for turning on/off power supply and power flicker in CPU or logic systems. This IC can change delay time by an external capacitor. Charging method of the capacitor, is current source type. Current source type can reduce temperature fluctuations in the delay time. td typ. ±6% (Ta=-40 C to 105 C), It is ideal for a wide set the operating temperature range. Features 1. Maximum supply voltage 7V 2. Detecting voltage accuracy ±1.0% 3. Low supply current 0.35µA typ. 4. Operating supply voltage 0.95 to 6.5V 5. Operating temperature -40 to +105 C 6. Reset voltage rank 1.6 to 5.2V (0.1Vstep) 7. Reset temperature coefficient ±100ppm/ C typ. 8. Current source 100nA typ. 9. Output type Open drain, CMOS Delay time (s) Delay time temperature characteristics =0.01[µF] Current source type Delay Resistance type Temperature (ºC) Packages SC-82ABB SOT-25A Applications 1. The reset of CPU and MPU and logic circuit 2. Battery voltage check 3. Back-up circuit 4. Level detector
2 Block Diagram 893Bxxx Charge current Vref : Protection Circuit 894Bxxx Charge current Vref : Protection Circuit
3 Pin Assignment SC-82ABB (TOP VIEW) SOT-25A (TOP VIEW) NC 5 Pin Description SC-82ABB SOT-25A Pin No. Pin name Functions 1 Pin 2 Pin / Voltage Detect Pin 3 Capacitor Connect Pin with Delay 4 Reset Signal Output Pin Pin No. Pin name Functions 1 Reset Signal Output Pin 2 Pin / Voltage Detect Pin 3 Pin 4 NC No Connection 5 Capacitor Connect Pin with Delay
4 Absolute Maximum Ratings (Except where noted otherwise Ta=25 C) Item Symbol Ratings Units Supply Voltage max ~+7.0 V Output Voltage 893 Series ~ max Series ~+7.0 Input Current () IDD 0~20 ma Output Current () I 0~20 ma Pin Input Voltage V ~ max V Power dissipation Pd 150 mw Operating temperature Topr - 40~+105 C Storage temperature Tstg - 65~+125 C V Recommended Operating Conditions Item Symbol Ratings Units Operating Ambient temperature Topr - 40~+105 C Operating voltage 0.95~6.5 V Model Name P S T 8 9 B a b c d e a b c d e Output Type pin charge Type Detecting Voltage Rank Package Packing Specifications 3 4 CMOS Output Open drain Output B Current source ~ 520 Setting of the detection voltage from 1.6V to 5.2V,0.1V step. U SC-82ABB M R HOUSING Halogen-free Product N SOT-25A H L HOUSING Halogen-free Product
5 Electrical Characteristics (Except where noted otherwise Ta=25 C) Item Symbol Measurement conditions Rank Min. Typ. Max. Units Circuit Reset threshold Ta=+25 C VTH 280 (Note1) Ta= 40~+85 C V Note1 : This device is tested at Ta=25 C, over temperature limits guaranteed by desigh only. Note2 : The parameter is guaranteed by design.
6 Item Symbol Measurement conditions Rank Min. Typ. Max. Units Circuit Reset threshold Ta=+25 C VTH (Note1) Ta= 40~+85 C V Note1 : This device is tested at Ta=25 C, over temperature limits guaranteed by desigh only. Note2 : The parameter is guaranteed by design.
7 Item Symbol Measurement conditions Rank Min. Typ. Max. Units Circuit Reset threshold VTH =0V VTH+1V 0V hysteresis V Note1 : This device is tested at Ta=25 C, over temperature limits guaranteed by desigh only. Note2 : The parameter is guaranteed by design.
8 Item Symbol Measurement conditions Rank Min. Typ. Max. Units Circuit Supply Current IDD =VTH+1V Reset threshold temp. coefficient (Note1) L transfer delay time (Note2) H transfer delay time (Note2) "L" Output Current VTH/ C tphl tplh IOL1 IOL2 IOL3 IOL4 Ta=-40~+85 C =VTH+0.4V VTH-0.4V =VTH+0.4V VTH-0.4V =0.95V, VDS=0.05V =1.2V, VDS=0.5V =2.4V, VDS=0.5V VTH 2.5V =3.6V, VDS=0.5V VTH 3.7V µa 1 ±100 ppm/ C µs µs ma 3 "H" Output Current IOH1 =4.8V, VDS=0.5V VTH 4.7V 893 series only ~ ma 3 IOH2 =6.1V, VDS=0.5V 893 series only Output Leakage Current Ileak =6.5V, =6.5V 894 series only 0.1 µa 3 Pin charge Current ID =VTH+1V VDS=0V na 5 Pin Threshold Voltage VT =VTH 1.1V V 4 Pin Output Current1 I1 =0.95V VDS=0.1V µa 5 Pin Output Current2 I2 =1.5V VDS=0.5V µa 5 Note1 : This device is tested at Ta=25 C, over temperature limits guaranteed by desigh only. Note2 : The parameter is guaranteed by design.
9 Test Circuit (1) (2) IDD Note3 470k 89XX 89XX (3) (4) Note3 470k 89XX I VDS VDS 89XX (5) I 89XX VDS (6) Note3 470k Input Voltage VTH VTH+0.4V VTH- 0.4V VDS 89XX Output Voltage 100% 50% tphl tplh Note3 : 894series only
10 Timing Chart Supply Voltage VSET Release voltage (VTH+ VTH) Capacitor Voltage Pin Thereshold voltage (VT) Output Voltage Delay Time(tD) td=c 0.5 VSET / ID (s) VSET ID : Capacitor : Supply voltage : Pin Charge current 100nA. typ V VTH VTH VTH+ VTH V t tplh thl t
11 Operation Explanation Detection Voltage Refers to the voltage when the voltage of the terminal voltage switches from H level to L level when reducing the voltage. Release Voltage Refers to the voltage when the voltage of the terminal voltage switches from L level to H level when raising the voltage. Hysteresis Voltage Hysteresis voltage = release voltage - detection voltage, and refers to the difference in voltage. L Propagation Delay Time Refers to the time from when the voltage decreases below the detection voltage to when the terminal voltage switches from H level to L level, and is the response time within the reset IC when a reduction in the supply voltage is detected. H Propagation Delay Time Refers to the time from when the voltage decreases below the release voltage to when the terminal voltage switches from L level to H level, and is the response time within the reset IC when the power supply starts up. Release Delay Time Refers to the delay time for switching the terminal during the condenser charging time due to the terminal condenser and charging current within the reset IC. Configured with the time or delay until voltage stabilizes when the set power supply starts up. L Output Current Drain current of the terminal NMOS. The synchronization current that turns the NMOS ON and sets the terminal voltage to L level when < detection voltage. Select the appropriate pull-up resistance for the synchronization capability for open drain output parts. If the pull-up resistance value is too low, VDS is generated so that L level voltage 0.3V, and may not reach 0V. H Output Current The drain current of the terminal PMOS for CMOS output parts. The synchronization current that turns the PMOS ON and sets the terminal voltage to H level when > release voltage. Delay Terminal Charging Current Refers to the current for charging the condenser connected to the terminal to generate the release delay time. Delay Terminal Threshold Value Voltage Refers to the terminal voltage refers to the threshold voltage that is input into subsequent inverters to reverse the inverter output. Delay Terminal Output Current The drain current of the terminal NMOS. Refers to the current for charging the condenser connected to the terminal. As the discharge current capability is small at around several 100 µa, a delay is generated for the terminal response time corresponding to the discharge time as the terminal capacity value increases. Check operation when the delay is 1µF or more in particular. Delay Terminal The delay terminal is the current source and has a high impedance. If board leakage, condensation or other leakages occur at the terminal, logical inversion occurs at subsequent inverters and logical inversion also occurs at the terminal. The delay terminal has a high impedance and logical inversion may occur due to factors such as external noise, so using the terminal while OPEN is not recommended. Use the delay terminal by connecting it with 100 pf or more.
12 For the setting of the release delay time Operation of the power supply start-up 1 It raised to = 0V VSET. 2 Comparator to detect release voltage (detection voltage + hysteresis voltage) or more. 3 Discharge NMOS of the pin : ON OFF. It is charged the capacitor of the pin from delay pincharge current. 4 Capacitor of the pin is charged, the inverter detects the above "0.5 ". The threshold voltage of the inverter is the following. Pin Threshold Voltage 0.3min typ max 5 : L H, it is released from the reset. For the setting of the release delay time 89xB series A constant current source, relationship charging time of the capacitor Q=I t=c V Release delay time, it is time to be " Pin Voltage" = "the threshold voltage of the inverter" VT typ = 0.5 VSET ". It will be prompted by the following equation. td typ = C VT typ / ID = C 0.5 VSET / ID (s) : Capacitor VSET : Supply voltage ID : pin charge current 100nA typ. COMP inverter VSET Delay time Discharge NMOS C
13 89xB series release delay time TYPICAL PERFORMANCE CHARACTERISTICS 1,000 Release delay time Release delay times (ms) =0.01µF =1000pF =100pF VSET (V) VSET Delay time
14 Application Circuits 89XX RESET Logic System 894 Series only We shall not be liable for any trouble or damage caused by using this circuit. In the event a problem which may affect industrial property or any other rights of us or a third party is encountered during the use of information described in these circuit, Mitsumi Electric Co., Ltd. shall not be liable for any such problem, nor grant a license therefore. Please note that there is any possibility of circuit oscillation when resistance put in the line. Recommend 15k ohm or less for 894. Please do not put resistance for 893. TYP hysteresis voltage of 89 series is a detecting voltage During power-up, and to release reset, it is time that it has become more than the release voltage (= detection voltage + hysteresis voltage). By calculating the variation of the power supply and the detection voltage and the release voltage, please select the detecting voltage rank. In pin, please do not use from the external voltage, and current source. Between pin ~ pin, please use by connecting more than capacitor 100pF. When the terminal capacitance value is greater than or more 1µF, time of the charge and discharge, the response of the waveform is delayed. To power reduction of short-pulse, and less likely to respond. By the power supply voltage drop due to instantaneous interruption, the ack of discharge current capability of terminal, is not completely discharge, increasing again power-than release delay time of setting, it will be shorter.
15 Characteristics (2.8V) (Except where noted otherwise Ta=25 C) Detecting Voltage Supply Current Output Voltage (V) Supply Current (µa) Input Voltage (V) Input Voltage (V) Pin Charge Current Pin Output Current Pin Charge Current (na) Input Voltage (V) Pin Output Current (ma) Input Voltage (V) N-ch Output Current N-ch Output Current N-ch Output Current (ma) =2.4V =1.2V 4 =0.95V VDS (V) N-ch Output Current (ma) =2.4V =1.2V =0.95V VDS (V) Note : These are typical characteristics.
16 Detecting Voltage - Temperature Hysteresis Voltage - Temperature Detecting Voltage (V) Hysteresis Voltage (mv) "L"Output Current 1 - Temperature 0.50 "L"Output Current 2 - Temperature 5.0 "L"Output Current 1 (ma) "L"Output Current 2 (ma) "L"Output Current 3 - Temperature "L"Output Current 3 (ma) Note : These are typical characteristics.
17 Pin Charge Current - Temperature Pin Threshold Voltage - Temperature Pin Charge Current (na) Pin Threshold Voltage (V) Pin Output Current 1 - Temperature Pin Output Current 2 - Temperature Pin Output Current 1 (µa) Pin Output Current 2 (µa) Note : These are typical characteristics.
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