Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Features Introduction • Precision supply-voltage monitor The STCxxx family microprocessor (µP) - 4.63V (STC8xxL, STC634xL) supervisory circuits are targeted to improve reliability - 4.38V (STC8xxM, STC634xM) and accuracy of power-supply circuitry in µP systems. - 3.08V (STC8xxT, STC634xT) These devices reduce the complexity and number of - 2.93V (STC8xxS, STC634xS) components required to monitor power-supply and - 2.63V (STC8xxR, STC634xR) battery functions. - 2.32V (STC8xxZ, STC634xZ) The main functions are: - 2.20V (STC8xxY, STC634xY) 1. Asserting reset output during power-up, power- • 200ms reset pulse width down and brownout conditions for µP system; • Debounced CMOS-compatible manual-reset input 2. Detecting power failure or low-battery conditions (811, 812, 823, 825, 6342-6344) with a 1.25V threshold detector; • Reset Output Signal for Watchdog and Power 3. Watchdog functions; Abnormal, Manual Reset 4. Manual reset. • Reset Push-Pull output (STC809,811,823, 824,825,6342,6345) Applications • Reset Open-Drain output (STC803/6343) • Power-supply circuitry in µP systems • Voltage monitor for power-fail or low battery warning • Guaranteed RESET/RESET valid at VCC = 1.0V Ordering Information RESET output Part No. Push-Pull 1 2 3 4 5 6 7 8 9 10 11 12 STC803X STC809X STC810X STC811X STC812X STC823X STC824X STC825X STC6342X STC6343X STC6344X STC6345X Open-Drain √ - √ √ √ √ √ √ - √ - Manual Reset Input √ √ √ - √ √ √ - √ - √ RESET output (push-pull) - √ √ √ √ - √ √ Power Fail Detector (1.25V) √ √ √ √ Watchdog Input √ √ - Package SOT23-3 SOT23-5 SOT23-6 Suffix: X -- Monitored Voltage Suffix X Reset threshold (V) STC L 4.63 M 4.38 T 3.08 1 S 2.93 R 2.63 Z 2.32 Y 2.20 Ver1.0 Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Contents Features ....................................................................................................................................................... 1 Ordering Information .................................................................................................................................. 1 Introduction ................................................................................................................................................. 1 Block Diagram ............................................................................................................................................ 3 Marking Information ................................................................................................................................... 4 Pin Information ........................................................................................................................................... 5 Pin Configuration .............................................................................................................................. 5 Pin Description .................................................................................................................................. 6 Functional Description ................................................................................................................................ 7 Reset Output ...................................................................................................................................... 7 Watchdog Timer ................................................................................................................................ 7 Manual Reset ..................................................................................................................................... 7 Power-Fail Comparator ..................................................................................................................... 7 Recommended Operation Condition ................................................................................................. 8 Detailed Specifications ................................................................................................................................ 8 Absolute Maximum Ratings .............................................................................................................. 8 DC Electrical Characteristics ............................................................................................................. 9 AC Electrical Characteristics ........................................................................................................... 10 Mechanical Information ............................................................................................................................ 11 Notes ......................................................................................................................................................... 14 STC 2 Ver1.0 Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Block Diagram Figure 1. Block Diagram WDI Watchdog Transition Detector Watchdog Timer V cc Timebase for Reset & Watchdog MR Reset Generator Vcc RESET (RESET) V RST PFI PFO 1.25V STC 3 Ver1.0 Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Marking Information 1 2 3 4 C od e Descr ip t ion 12 Part Number 3 Year 4 Work Week Part Number Code Code 1 2 AA AB AC AD AE Code 1 2 Part No. Code 1 2 Part No. STC809L BC STC803L CE STC6342L STC809M BD STC803M CF STC6342M STC809T BE STC803T CG STC6342T STC809S BF STC803S CH STC6342S STC809R BG STC803R CI STC6342R STC803Z AF STC809Z BH 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 STC810R BN STC823R CP STC6343R STC810Z BO STC823Z CQ STC6343Z STC810Y BP STC823Y CR STC6343Y STC811L BQ STC824L CS STC6344L 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 STC812S CA STC825S DC STC6345S STC812R CB STC825R DD STC6345R BA STC812Z CC STC825Z DE STC6345Z BB STC812Y CD STC825Y DF STC6345Y AL AM AN AO AP AY AZ STC Part No. 4 Ver1.0 Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pin Information Pin Configuration Figure 2. Pin Configuration SOT23-3 STC803 STC809 STC810 GND 1 VCC 2 GND 1 3 VCC RESET 2 3 RESET SOT23-5 STC811 1 GND 2 NC 3 RESET STC812 VCC MR 5 4 STC823 1 RESET 2 GND 3 MR 1 GND 2 NC 3 RESET VCC 5 MR 4 STC824 VCC WDI 5 4 1 RESET 2 GND 3 RESET STC825 VCC WDI 5 4 1 RESET 2 GND 3 RESET VCC 5 MR 4 SOT23-6 STC6342 STC6343 STC STC6344 STC6345 1 VCC RESET 6 1 VCC RESET 6 1 VCC RESET 6 2 GND MR 5 2 GND MR 5 2 GND RESET 5 3 PFI PFO 4 3 PFI PFO 4 3 PFI PFO 4 5 Ver1.0 Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pin Description Table 2. Pin Description P in Na me Typ e Descr ip t ion MR I Ma n u a l-R eset : (C MO S). Active low. Pull low to force a reset. Reset remains asserted for the duration of the Reset Timeout Period after MR transitions from low to high. Leave unconnected or connected to VCC if not used. Vcc Power Power Su p p ly: Reset is asserted when VCC drops below the Reset Threshold Voltage (VRST). Reset remains asserted until VCC rises above VRST and keep asserted for the duration of the Reset Timeout Period (tRS) once VCC rises above VRST. GND Ground G r ou n d R efer en ce for all signals PFI I Power -Fa il Volt a ge Mon it or I n p u t . When PFI <VPFT , PFO goes low. Connect PFI to GND or Vcc when not used. PFO O Power -Fa il O u t p u t : it gets low and sinks current when PFI is less than 1.25V; otherwise PFO stays high. WDI I Watchdog Input (CMOS). If WDI remains high or low for the duration of the watchdog timeout period (tWD), the internal watchdog timer trigger a reset output. Floating WDI or connecting WDI to a highimpedance three-state buffer disables the watchdog feature. The internal watchdog timer clears whenever reset is asserted or WDI occurs a rising or falling edge. RESET O Act ive-L ow R eset O u t p u t (P u sh -P u ll or O p en -Dr a in ). It goes low when Vcc is below the reset threshold. It remains low for about 200ms after one of the following occurs: Vcc rises above the reset threshold (VRST), the watchdog triggers a reset, or MR goes from low to high. RESET O T h e inver se of R E SE T, active high. Whenever RESET is high, RESET is low. NC - No con n ect ion STC 6 Ver1.0 Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Watchdog Timer Functional Description The STC823/824 watchdog circuit monitors the µP’s activity. If the µP does not toggle the watch-dog input (WDI) within 1.6s, reset asserts. As long as reset is asserted or the WDI input is toggled, the watchdog timer will stay clear and will not count. As soon as reset is released, the timer will start counting. WDI input pulses as short as 50ns can be detected. Disable the watchdog function by leaving WDI unconnected or by three-stating driver connected to WDI. Reset Output A microprocessor’s (µP’s) reset input starts the µP in a known state. Whenever the µP is in an unknown state, it should be held in reset. The supervisory circuits assert reset during powerup and prevent code execution errors during power-down or brownout conditions. On power-up, once Vcc reaches about 1.0V, RESET is a guaranteed logic low of 0.4V or less. As Vcc rises, RESET stays low. When Vcc rises above the reset threshold, an internal timer releases RESET after about 200ms. RESET pulses low whenever Vcc drops below the reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated reset pulse, the pulse continues for at least another 200ms. On powerdown, once Vcc falls below the reset threshold, RESET stays low and is guaranteed to be 0.4V or less until Vcc drops below 1.0V. Fig 4 shows the timing relationship. Manual Reset The manual-reset input (MR) allows reset to be triggered by a push button switch. MR has an internal pullup resistor, so it can be left open when not used. Power-Fail Comparator The power-fail comparator can be used for various purposes because its output and noninverting input are not internally connected. The inverting input is internally connected to a 1.25V reference. The active-high RESET output is simply the inverse of the RESET output, and is guaranteed to be valid with Vcc down to 1.0V. Figure 3. Typical Application Circuit IN DC Linear Regulator µP Vcc RESET µP Supervisory Circuit PFI WDI RESET MR Interrupt Vcc STC PFO 7 I/O Line Ver1.0 Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Detailed Specifications Absolute Maximum Ratings Storage Temperature ....................................................... -65oC to +150oC Ambient Temperature with Power Applied ....................... -40oC to +85oC Supply Voltage to Ground Potential (Vcc to GND) ........... -0.3V to +7.0V DC Input Voltage (All inputs except Vcc and GND) ..... -0.3V to VCC+0.3V DC Output Current (All outputs) .................................................... 20mA Power Dissipation ........................................................................ 320mW (Depend on package) Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Recommended Operation Condition Table 3. DC Electrical Characteristics Sym Min Typ Ma x Un it Supply Voltage for xxxL, xxxM 4.5 5.0 5.5 V Supply Voltage for 3.0 3.3 5.5 V Supply Voltage for xxxR 2.7 3.0 5.5 V Supply Voltage for xxxZ, xxxY 2.4 2.5 5.5 V VIH Input High Voltage 0.7VCC VIL Input Low Voltage TA Operating Temperature VCC STC Descr ip t ion Test C on d it ion s xxT, xxxS V 0.3VCC -40 8 85 Ver1.0 V O C Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- DC Electrical Characteristics Table 4. DC Electrical Characteristics (Vcc=VRN+5% to 5.5V, TA= -40~85”C, unless otherwise noted) Symbol Description Test Conditions VCC Operating Voltage Range ICC Supply Current Vcc = 5V, No load VIH Input High Voltage Pin: MR, WDI VIL Input Low Voltage Pin: MR, WDI Min Typ 1.0 Unit 5.5 V 50 µA 0.7 Vcc STCxxxL STCxxxM STCxxxT STCxxxS STCxxxR STCxxxZ STCxxxY VRST Reset Threshold Voltage (Note 1) TA= -40 ~ 85”C VRTH Reset Threshold Hysteresis(Note 1) Vcc varies between VRN±5% VOH Output High Voltage Vcc ≥ 4.5V Vcc ≥ 2.7V Vcc ≥ 1.8V Vcc ≥ 4.5V Vcc ≥ 2.7V Vcc ≥ 1.2V 20 Max Isource=800µA Isource=500µA Isource=150µA Isink=3.2mA Isink=1.2mA Isink=100µA VOL Output Low Voltage ILKG Open-Drain Output Leakage Current VCC > VTH(MAX) for STC803 and STC6343 VPFT PFI Input Threshold VPFI varies from 1.5V and 1.0V IPFI PFI Input Leakage Current IWDI Average WDI Input Current (Note 2) r MR pull-up resistor (internal) VRN-2.5% 4.514 4.271 3.003 2.857 2.564 2.262 2.145 V VRN 4.63 4.38 3.08 2.93 2.63 2.32 2.20 0.3 Vcc V VRN+2.5% 4.746 4.490 3.157 3.003 2.696 2.378 2.255 V 70 mV Vcc-1.5 0.8 Vcc 0.8 Vcc 1.20 WDI connected to VCC: 5.5V V 1.25 120 0.4 0.3 0.3 V 1 µA 1.30 V ±25 nA 160 WDI connected to GND -20 -15 STC811/7812 10 20 30 STC823/824/825 35 52 75 STC6342/6343/6344 60 * Valid for both RESET and RESET. VRN is nominal reset threshold voltage. ** WDI is internally serviced within the watchdog period if WDI is left unconnected. STC 9 Ver1.0 µA kΩ Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- AC Electrical Characteristics Table 5. AC Electrical Characteristics Sym Descr ip t ion Test C on d it ion s Min Typ Ma x Un it s tRS Reset Pulse Width MR from low to High 140 200 280 ms tWD Watchdog Timeout Period WDI and MR tied to VCC, VCC > VRN + 5% 1.12 1.6 2.25 s tMR MR Pulse Width tMD MR to RESET Delay tWP WDI Pulse Width µs 1 VCC = 5.0V 250 50 ns Figure 4. Watchdog Timing Diagram V CC V RST V RST tR S tW D tR S tR S RESET RESET tW P tM D WDI tM R MR STC 10 ns Ver1.0 Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Mechanical Information Figure 5. SOT23-3 0.075 1.90 BSC 0.059 1.50 0.068 1.75 0.102 2.60 0.118 3.00 0o - 10o Datum “A” 0037 0.95 BSC 0.004 0.10 0.023 0.60 0.014 0.35 0.019 0.50 0.110 2.80 0.118 3.00 0.057 1.45 MAX SEATING PLANE 0.000 0.00 0.005 0.15 X.XX Denotes Dimensions X.XX In Millimeters Notes: 1)Controlling dimensions in millimeters 2)Ref: EIAJ SC-74A 3)Foot length is measured at flat portion of foot, reference to Datum A STC 11 Ver1.0 Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Figure 6. SOT23-5 0.075 1.90 BSC 0.059 1.50 0.068 1.75 0.102 2.60 0.118 3.00 0o - 10o Datum “A” 0037 0.95 BSC 0.004 0.10 0.023 0.60 0.014 0.35 0.019 0.50 0.110 2.80 0.118 3.00 0.057 1.45 MAX SEATING PLANE 0.000 0.00 0.005 0.15 X.XX Denotes Dimensions X.XX In Millimeters Notes: 1)Controlling dimensions in millimeters 2)Ref: EIAJ SC-74A 3)Foot length is measured at flat portion of foot, reference to Datum A STC 12 Ver1.0 Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 µP Supervisor Circuits -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Figure 7. SOT23-6 0.075 1.90 BSC 0.059 1.50 0.068 1.75 0.102 2.60 0.118 3.00 0o - 10o Datum “A” 0037 0.95 BSC 0.004 0.10 0.023 0.60 0.014 0.35 0.019 0.50 0.110 2.80 0.118 3.00 0.057 1.45 MAX SEATING PLANE 0.000 0.00 0.005 0.15 X.XX Denotes Dimensions X.XX In Millimeters Notes: 1)Controlling dimensions in millimeters 2)Ref: EIAJ SC-74A 3)Foot length is measured at flat portion of foot, reference to Datum A STC 13 Ver1.0