SYSTEM RESET IC WITH DELAY CIRCUIT

Transcription

1 SYSTEM RESET IC WITH DELAY CIRCUIT GENERAL DESCRIPTION The is a system reset IC with built-in delay circuit that monitors the status of a power line, and outputs a reset signal to the microcomputer. The outputs a reset signal when fall below the detection voltage. Delay times are fixed internally and those are set in each of rising and falling. It is possible to monitor multiplex power line by combination of because output voltage is kept Low level when Pin is Low level by connecting with other. Detection voltage s default value is.v. It can be adjusted to desired voltage by the resistor divider. In addition, a hysteresis voltage can be set arbitrarily by inserting a resistor between the pin and the pin. PACKAGE OUTLINE F FEATURES High Precision Detection Voltage.% (Ta= C) Detection Voltage.V (default) and adjustable with external resistor Reset Output Logic Reset Low output when pin is detection voltage or below *If required reset low output when pin is detection voltage or more, see the NJU7295. Delay Circuit (Internal Fixed type) Rising / Falling independent setting Ultra Low Quiescent Current.7µA typ. Supply Voltage Range.5 to 5.5V External Input pin While inputting low signal, keep output Low level Adjustable Hysteresis Voltage Output Type CMOS output Package SOT PIN CONFIGURATION Pin Function. :Input Voltage pin 2. :Ground pin 3. :External Input pin 4. :Supply Voltage pin 5. :Output pin 6. :External Resistor pin for setting Hysteresis Voltage Ver

2 BLOCK DIAGRAM Delay Circuit PRODUCT CLASSFICATION Device Name Version Delay Time(Typ.) Delay Time2(Typ.) F-A A.ms ms F-B B ms ms F-C C ms ms F-D D 3 s ms ABSOLUTE MAXIMUM RATINGS (Ta= C) PARAMETER SYMBOL RATINGS UNIT Supply Voltage +7 V Input Voltage -.3 to +7 V Output Voltage -.3 to +.3 V Pin Voltage V -.3 to +.3 V Pin Input Voltage V -.3 to +.3 V Output Current I OUT 5 ma Pin Current I ma Power Dissipation P D SOT (*) 58(*2) mw Surge Current I IN_SRG ±2.5(*3) ma Operating Temperature T opr -4 to +5 C Storage Temperature T stg -4 to + C (*): Mounted on glass epoxy board. ( mm: based on EIA/JDEC standard, 2Layers) (*2): Mounted on glass epoxy board. ( mm:based on EIA/JDEC standard, 4Layers), internal Cu area: mm (*3): Permissible current range there is no logical error in and no destruction Ver.6--7

3 ELECTRICAL CHARACTERISTICS Unless otherwise noted, =3.3V, Ta= C PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Detection Voltage V DET -.%. +.% V Quiescent Current I SS No Signal A Output Current I OUT Nch, V DS =.5V Pch, V DS =.5V ma Pin Current I Nch, V DS =.5V Pch, V DS =.5V ma Average Temperature Coefficient of Detection V DET / Ta Ta= C to +85 C - - ppm/ C Voltage Pin High Level Voltage V _H.67x - V Pin Low Level Voltage V _L x V Pin Resistance R IN - M Pin Resistance R.5. - M Operating Voltage V OPL V ELECTRICAL CHARACTERISTICS (Defined by each versions) Unless otherwise noted, =3.3V, Ta= C PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT F-A ms Delay Time t d =H L F-B 7 4 ms F-C 7 4 ms F-D - 3 s F-A 7 4 ms Delay Time 2 t d2 =L H F-B 6 24 ms F-C 7 4 ms F-D 7 4 ms Ver

4 TEST CIRCUIT Quiescent Current Detection Voltage A NJU7295 V R R2 NJU7295 V Output Current Pin Current NJU7295 A A NJU7295 Pin Input Voltage Delay Time Oscilloscope etc. オシロスコープ等 ch ch2 NJU7295 NJU7295 V Minimum Operating Voltage R R2 NJU7295 RL V Ver.6--7

5 FUNCTION DESCRIPTION () Basic Operation Input Voltage () Detection Voltage (V DET) Output Voltage () Release Voltage * (V DET) *In case of not setting the hysteresis voltage. () When input voltage falls below the detection voltage V DET, after the delay time which is fixed for each version, the output voltage is switched from High level to Low level. (2) In the state of is below the release voltage V DET, the reset state is maintained. The default release voltage V DET is same as detection voltage V DET, although can be set the hysteresis by inserting a resistor between the pin and the pin. Delay Time (t d) Delay Time2 (t d2) (3) When increases and it reaches release voltage V DET, after the delay time which is fixed for each version, is switched from Low level to High level. Ver

6 TYPICAL APPLICATION R, R2 : Adjust the detection voltage by resistor divider R R2 CIN Delay Circuit CIN : Setting the hysteresis voltage : To prevent malfunction due to noise (Recommend about pf to pf) :The input logic signals from other power line Adjusting of Detection Voltage The Detection voltage of is fixed as.v (typ.) internally, although it can be adjusted to a desired Detection Voltage by connecting external resistor (R,R2) to a pin. When adjusting to a desired Detection Voltage, it's necessary to consider pin resistance R IN. ( MΩ typ.) Setting of Hysteresis Voltage The doesn't have the Hysteresis Voltage between the Release Voltage and Detecting Voltage in default. It's able to set the Hysteresis Voltage optionally by connecting dividing resistor between the - pin. Detection Voltage VDET R( R2 RIN RIN) VDET R2 R ( VDD VDET ) Hysteresis Voltage = R VDD Release Voltage = Detection Voltage + Hysteresis Voltage External input pin If inputs the logic signal from other power line into the pin, it can be kept the status of the output "Low level" and ignoring the status of detection voltage V DET. When inputs a low level signal into the pin, is kept low level. It is useful for manual reset function. If do not use the External input, the pin should be connected to or Open Ver.6--7

7 TYPICAL =3.3V Detection Voltage vs Temperature Detection Voltage :V DET [V] Quiescent Current :I SS [μa] C No Signal Quiescent Current vs Supply Voltage Quiescent Current :I SS [μa] =3.3V No Signal Queiscent Current vs Temperature Supply Voltage : [V] Pin Resistance :R IN [MΩ] Pin Resistance vs Temperature Pin Resistance R [MΩ] Pin Resistance vs Temperature Ver

8 .5 -A Delay Time vs Supply Voltage.5 -A Delay Time vs Temperature Delay time :t d C =H L Delay Time :t d =3.3V =H L.. Supply Voltagge : [V] 4 C =H L -B/C Delay Time vs Supply Voltage 4 =3.3V =H L -B/C Delay Time vs Temperature Delay Time :t d [ms] 9 8 Delay Time :t d [ms] Supply Voltage : [V] 6 C =H L -D Delay Time vs Supply Voltage =3.3V =H L -D Delay Time vs Temperature Delay Time :t d [ s] 35 3 Delay Time :t d [ s] 35 3 Supply Voltage : [V] Ver.6--7

9 4 C =L H -A/C/D Delay Time2 vs Supply Voltage 4 =3.3V =L H -A/C/D Delay Time 2 vs Temperature Delay Time2 :t d2 [ms] 9 8 Delay Time2 :t d2 [ms] Supply Voltage : [V] 6 Delay time2 :t d2 [ms] C =L H -B Delay Time2 vs Supply Voltage Supply Voltage : [V] Delay Time2 :t d2 [ms] =3.3V =L H -B Delay time2 vs Temperature DS =.5V Nch Output Current vs Temperature DS =.5V Pch Output Current vs Temperature Nch Output Current :I OUT [ma] 5 Pch Output Current :I OUT [ma] 5 Ver

10 3 Nch Current vs Temperature 3 Pch Current vs DS DS =.5V Nch Current :I [ma] 5 Pch Current :I [ma] 5 [CAUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. - - Ver.6--7