IN1705D POWER SUPPLY CHECK MICROCIRCUIT WITH HOST PRIMARY SUPPLY MONITORING CIRCUIT IN1705D microcircuit is purposed to check power supply and to start up microcontroller and microprocessor systems. It is applied to ensure regular standard operation of the circuit when the device is switched on\off and also when there is alarm emergency dropping of supply voltage. Physically the microcircuit is made in 8-pin SO-package MS012AA. LSIIC Characteritics: • Standard supply voltage 5,0 В • Operation temperature range ТA = from -40°to +85°С • RESET signal generation when power supply is provided for regular start-up of microprocessor RESET signal generation when power supply is dropped below operation one to exclude incorrect operation of microprocessor. • RESET signal generation when reset key is pressed • Option of threshold voltage programming when RESET signal is generated Microcircuit includes: • reference voltage source • two analog comparators • guard timer • digitizer, (digital sampler) • digital delay Pins’ designation in package Functions performed • RESET signal generation by fixed supply voltage level • RESET signal generation from external RESET key • Generation of guard timer state signal Alarm interrupt of host power supply Architecture diagramme IN Reference voltage source Ucc ______ PBRST Digitizer + ____ NMI - - Digitizer + Digital delay ____ Guard timer ____ WDS RST Schmitt trigger __ ST Microcircuit pins’ purpose 1 IN1705D Pin Symbol Name Type 01 ______ PBRST 02 Ucc Supply voltage pin - 03 GND Common pin - 04 IN ____ NMI __ ST ____ RST ____ WDS Host source check 05 06 07 08 Reset form external key Input Input Non-masked interrupt Output Guard timer strobe Input Reset actibe low Output Guard timer state Output Operation temperature range Operation temperature range от -40°С до +85°С. Limiting\tolerable conditions Parameter Symbol Name Norm UСС Supply voltage UIH UIL ТA High level input voltage Low level input voltage Operation temperature range not less not more Units 4,5 5,5 V 2,0 -0,03 -40 UСС+0,3 0,5 +85 V V °С Tolerable conditions Parameter symbol UСС UIH UIL Tstg Name Norm Supply voltage High level input voltage Low level input voltage Storage temperature 2 not less not more Unit -0,5 -0,5 -60 7,0 UСС+0,5 +125 V V V °С IN1705D Microcircuit serviceability is not guaranteed when limiting conditions are applied. After limiting conditions are withdrwn the serviceability will be guaranteed in limiting tolerable condition. Static parameters Parameter symbol Nme Measurement conditons Norm not less UIL UIH IOL UOH -ILIL -ILIL -ILIL ILIH IСС UCCTP UTP Low level input voltage UСС=from 4,5 to 5,5V High level input voltage UСС=from 4,5 to 5,5V Low level output UСС=from 4,5 to current 5,5V UOL=0,4V High level output voltage UСС=from 4,5 to 5,5В IOH=-500 mkА Low level input leakage UСС=from 4,5 to current (IN) 5,5V UI =UСС or USS Low level input leakage UСС=from 4,5 to current (ST) 5,5V UI =UСС or USS Low level input leakage UСС=from 4,5 to current (PBRST) 5,5В UI =UСС orUSS High level input UСС=from 4,5 to leakage current 5,5V UI =UСС or USS Dynamic consumption UСС=from 4,5 to current 5,5V UIL= USS, UIH=UCC Source voltagewhen UСС=from 4,5 to reset signal is 5,5V UIL= USS, generated UIH=UCC IN input voltage when UСС=from 4,5 to interrupt is 5,5V UIL= USS, generatedop UIH=UCC 3 - Units not more 0,5 V V 2,0 10,0 - mА UСС-0,3 - V - 1,0 mkА 10 100 mkА 50 450 mkА - 1,0 mkА - 60 mkА 4,5 4,75 V 1,2 1,3 V IN1705D Dynamic parameters UСС= from 4,5 to 5,5V, ТA = from -40° to+85°С Parameter Name symbol tTD tPDLY tRST tRPD tRPU tIPD tPB tST not less Guard timer reflow time Setting time for reset by PBRST signal Reset hold-in time by PBRST signal Setting time for reset by UСС Hold-in time for reset by UСС Interrupt setting time for IN input Key press duration (PBRST= UIL) Strobe pulse width Norm not more Unit 1,0 - 2,2 250 s ns 130 130 150 285 8,0 285 8,0 - ms mks ms mks ns 10 - ns Time diagrammes tPB ______ PBRST tPDLY UIH UIL tRST ____ RST UOH Fig.1 - Time diagramme of generation guard timer state signal. ___ Undefined strobe Unreal strobe Real strobe ST t ST t TD MIN. ____ WDS Key initiated reset ___ RST Fig.2 - Time diagramme of generation guard timer state signal (strobed input) 4 MAX. IN1705D tF UCC UCCTP (MAX) UCCT P UCCTP (MIN) t RPD ____ RST U OL ____ WDS ____ WDS fall from UCC Fig. 3 - Time diagram of generation reset signal when power supply is dropped up to Ustrobe (power supply error) 5 IN1705D tR UCCTP (MAX) UCCTP (MIN) UCC UCCTP t RPU U OH ____ RST ____ WDS Fig. 4 - Time diagramme fo power supply connection (reset signal is reset active after power supply is transferred to stable state U IN > 1,25 B UTP (MAX) UTP ____ NMI UTP (MIN) UTP (MIN) UTP (MAX) UTP t IPD t IPD UOH U OL Fig. 5 - Time diagrammed of non-masked interrupt. 6