STC809 ETC1
Document overview
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- PDF pages: 13
Technical content
Features
- Precision supply-voltage monitor - 4.63V (STC8xxL, STC634xL) - 4.38V (STC8xxM, STC634 xM) - 3.08V (STC8xxT, STC634xT) - 2.93V (STC8xxS, STC634xS) - 2.63V (STC8xxR, STC634xR) - 2.32V (STC8xxZ, STC634xZ) - 2.20V (STC8xxY, STC634xY) 200ms reset pulse width Debounced CMOS-compatible manual-reset input (811, 812, 823, 825, 6 342-6344) Reset Output Signal for Watchdog and Power Abnormal, Manual Reset Reset Push-Pull output (STC809,811,823, 824,825,6 342,6345) Reset Open-Drain output (STC803/6 343) V oltage monitor for power-fail or low battery warning Guaranteed RESET/RESET valid at VCC = 1.0V Introduction The STCxxx family microprocessor (µP) supervisory circuits are targeted to improve reliability and accuracy of power-supply circuitry in µP systems. These devices reduce the complexity and number of components required to monitor power-supply and battery functions. The main functions are: 1. Asserting reset output during powe r-up, pow er- down and brownout conditions for µP system; 2. Detecting power failure or low-battery conditions with a 1.25V threshold detector; 3. Watchdog functions; 4. Manual reset.
Applications
Power-supply circuitry in µP systems
Ordering Information
Suffix: X -- Monitored V oltage Suffix X L M T S R Z Y RESET output Part No. Push-Pull Open-Drain RESET output (push-pull) Manual Reset Input Power Fail Detector (1.25V) Watchdog Input Package SOT23-3 SOT23-5 SOT23-6
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µµµµµP Supervisor Circuits STC Ver1.0
Contents
Figure 1. Block Diagram
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µµµµµP Supervisor Circuits STC Ver1.0 Marking Information edoCe doC edoC edoCe doCn oitpircseDn oitpircseD noitpircseD noitpircseDn oitpircseD 21r ebmuNtraP 3r aeY 4k eeWkroW Part Number Code Code 1 2 Part No. Code 1 2 Part No. Code 1 2 Part No. AA STC809L BC STC803L CE STC6342L AB STC809M BD STC803M CF STC6342M AC STC809T BE STC803T CG STC6342T AD STC809S BF STC803S CH STC6342S AE STC809R BG STC803R CI STC6342R AF STC809Z BH STC803Z CJ STC6342Z AG STC809Y BI STC803Y CK STC6342Y AH STC810L BJ STC823L CL STC6343L AI STC810M BK STC823M CM STC6343M AJ STC810T BL STC823T CN STC6343T AK STC810S BM STC823S CO STC6343S AL STC810R BN STC823R CP STC6343R AM STC810Z BO STC823Z CQ STC6343Z AN STC810Y BP STC823Y CR STC6343Y AO STC811L BQ STC824L CS STC6344L AP STC811M BR STC824M CT STC6344M AQ STC811T BS STC824T CU STC6344T AR STC811S BT STC824S CV STC6344S AS STC811R BU STC824R CW STC6344R AT STC811Z BV STC824Z CX STC6344Z AU STC811Y BW STC824Y CY STC6344Y AV STC812L BX STC825L CZ STC6345L AW STC812M BY STC825M DA STC6345M AX STC812T BZ STC825T DB STC6345T AY STC812S CA STC825S DC STC6345S AZ STC812R CB STC825R DD STC6345R BA STC812Z CC STC825Z DE STC6345Z BB STC812Y CD STC825Y DF STC6345Y 1 2 3 4
Figure 2. Pin Configuration
3 VCC
Table 2. Pin Description t(doireP SR Vecno) CC Vevobasesir TSR .
Vcc drops below the reset threshold, i.e. brownout condition. 1.0V . Fig 4 shows the timing relationship. toggled, the watchdog timer will stay clear and will not count. input pulses as short as 50ns can be detected. or by three-stating driver connected to WDI. can be left open when not used. Figure 3. Typical Application Circuit
Table 3. DC Electrical Characteristics tended periods may affect reliability.
Table 4. DC Electrical Characteristics
- V alid for both RESET and RESET. VRN is nominal reset threshold voltage.
** WDI is internally serviced within the watchdog period if WDI is left unconnected.
Table 5. AC Electrical Characteristics Figure 4. Watchdog Timing Diagram
Figure 5. SOT23-3
Figure 6. SOT23-5
Figure 7. SOT23-6