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| 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 * Operation temperature range A = from -40to +85 * 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 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 Pins' designation in package Architecture diagramme IN Reference voltage source Ucc ______ PBRST __ ST + - Digitizer ____ NMI + Digitizer Digital delay ____ RST Schmitt trigger Guard timer ____ WDS Microcircuit pins' purpose 1 IN1705D Pin 01 02 03 04 05 06 07 08 Symbol ______ PBRST Ucc GND IN ____ NMI __ ST ____ RST ____ WDS Name Reset form external key Supply voltage pin Common pin Host source check Non-masked interrupt Guard timer strobe Reset actibe low Guard timer state Type Input Input Output Input Output Output Operation temperature range Operation temperature range -40 +85. Limiting\tolerable conditions Parameter Symbol U UIH UIL A Name Norm not less Supply voltage High level input voltage Low level input voltage Operation temperature range 4,5 2,0 -0,03 -40 not more 5,5 U+0,3 0,5 +85 Units V V V Tolerable conditions Parameter symbol U UIH UIL Tstg Name Norm not less Supply voltage High level input voltage Low level input voltage Storage temperature -0,5 -0,5 -60 not more 7,0 U+0,5 +125 Unit V V V 2 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 UIL UIH IOL UOH Nme Measurement conditons not less U=from 4,5 to 5,5V High level input voltage U=from 4,5 to 5,5V Low level output U=from 4,5 to current 5,5V UOL=0,4V High level output voltage U=from 4,5 to 5,5 IOH=-500 mk Low level input leakage U=from 4,5 to current (IN) 5,5V UI =U or USS Low level input leakage U=from 4,5 to current (ST) 5,5V UI =U or USS Low level input leakage U=from 4,5 to current (PBRST) 5,5 UI =U orUSS High level input U=from 4,5 to leakage current 5,5V UI =U or USS Dynamic consumption U=from 4,5 to current 5,5V UIL= USS, UIH=UCC Source voltagewhen U=from 4,5 to reset signal is 5,5V UIL= USS, generated UIH=UCC IN input voltage when U=from 4,5 to interrupt is 5,5V UIL= USS, generatedop UIH=UCC Low level input voltage 2,0 10,0 U-0,3 Norm not more 0,5 Units V V m V -ILIL - 1,0 mk -ILIL 10 100 mk -ILIL 50 450 mk ILIH - 1,0 mk I - 60 mk UCCTP 4,5 4,75 V UTP 1,2 1,3 V 3 IN1705D Dynamic parameters U= from 4,5 to 5,5V, A = from -40 to+85 Parameter Name symbol tTD tPDLY tRST tRPD tRPU tIPD tPB tST Guard timer reflow time Setting time for reset by PBRST signal Reset hold-in time by PBRST signal Setting time for reset by U Hold-in time for reset by U Interrupt setting time for IN input Key press duration (PBRST= UIL) Strobe pulse width Norm not more 2,2 250 285 8,0 285 8,0 Unit s ns ms mks ms mks ns ns not less 1,0 130 130 150 10 Time diagrammes ______ PBRST UIL tPB tPDLY UIH tRST ____ RST UOH Fig.1 - Time diagramme of generation guard timer state signal. ___ Unreal strobe Real strobe Undefined strobe ST t ST ____ WDS Key initiated reset t TD MIN. MAX. ___ RST Fig.2 - Time diagramme of generation guard timer state signal (strobed input) 4 IN1705D UCC UCCTP (MAX) UCCT P tF UCCTP (MIN) ____ RST t RPD 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 UTP (MIN) UTP (MIN) UTP (MAX) UTP ____ NMI t IPD t IPD UOH U OL Fig. 5 - Time diagrammed of non-masked interrupt. 6 |
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