Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 µP Supervisor Circuits |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Features Introduction • Precision supply-voltage monitor The PT7M7xxx family microprocessor (µP) - 4.63V (PT7M7xxxL) supervisory circuits are targeted to improve reliability - 4.38V (PT7M7xxxM) and accuracy of power-supply circuitry in µP systems. - 3.08V (PT7M7xxxT) These devices reduce the complexity and number of - 2.93V (PT7M7xxxS) components required to monitor power-supply and - 2.63V (PT7M7xxxR) battery functions. - 2.32V (PT7M7xxxZ) The main functions are: - 2.20V (PT7M7xxxY) 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 (7811, 7812, 7823, 7825, 7342-7344) 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 (PT7M7809,7811,7823, 7824,7825,7342,7345) Applications • Reset Open-Drain output (PT7M7803/7343) • 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. 1 2 3 4 5 6 7 8 9 10 11 12 PT7M7803XT PT7M7809XT PT7M7810XT PT7M7811XT PT7M7812XT PT7M7823XT PT7M7824XT PT7M7825XT PT7M7342XT PT7M7343XT PT7M7344XT PT7M7345XT Push-Pull Open-Drain - √ - √ √ √ √ √ √ - √ - Manual Reset Input √ √ √ - √ √ √ - √ - √ RESET output (push-pull) - √ √ √ √ √ √ - T 3.08 S 2.93 Power Fail Detector (1.25V) √ √ √ √ Watchdog Input √ √ - Package SOT23-3 SOT23-5 SOT23-6 Suffix: X -- Monitored Voltage Suffix X Reset threshold (V) PT0109(02/03) L 4.63 M 4.38 1 R 2.63 Z 2.32 Y 2.20 Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 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 PT0109(02/03) 2 Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 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 PT0109(02/03) 3 Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 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 Part No. AA PT7M7809L AB AC AD AE Code 1 2 Part No. Code 1 2 Part No. BC PT7M7803L CE PT7M7342L PT7M7809M BD PT7M7803M CF PT7M7342M PT7M7809T BE PT7M7803T CG PT7M7342T PT7M7809S BF PT7M7803S CH PT7M7342S PT7M7809R BG PT7M7803R CI PT7M7342R PT7M7803Z AF PT7M7809Z BH CJ PT7M7342Z AG PT7M7809Y BI PT7M7803Y CK PT7M7342Y AH PT7M7810L BJ PT7M7823L CL PT7M7343L AI PT7M7810M BK PT7M7823M CM PT7M7343M AJ PT7M7810T BL PT7M7823T CN PT7M7343T AK PT7M7810S BM PT7M7823S CO PT7M7343S PT7M7810R BN PT7M7823R CP PT7M7343R PT7M7810Z BO PT7M7823Z CQ PT7M7343Z PT7M7810Y BP PT7M7823Y CR PT7M7343Y PT7M7811L BQ PT7M7824L CS PT7M7344L PT7M7811M BR PT7M7824M CT PT7M7344M AQ PT7M7811T BS PT7M7824T CU PT7M7344T AR PT7M7811S BT PT7M7824S CV PT7M7344S AS PT7M7811R BU PT7M7824R CW PT7M7344R AT PT7M7811Z BV PT7M7824Z CX PT7M7344Z AU PT7M7811Y BW PT7M7824Y CY PT7M7344Y AV PT7M7812L BX PT7M7825L CZ PT7M7345L AW PT7M7812M BY PT7M7825M DA PT7M7345M AX PT7M7812T BZ PT7M7825T DB PT7M7345T PT7M7812S CA PT7M7825S DC PT7M7345S PT7M7812R CB PT7M7825R DD PT7M7345R BA PT7M7812Z CC PT7M7825Z DE PT7M7345Z BB PT7M7812Y CD PT7M7825Y DF PT7M7345Y AL AM AN AO AP AY AZ PT0109(02/03) 4 Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 µP Supervisor Circuits |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Pin Information Pin Configuration Figure 2. Pin Configuration SOT23-3 PT7M7803 PT7M7809 PT7M7810 GND 1 VCC 2 GND 1 3 VCC RESET 2 3 RESET SOT23-5 PT7M7811 1 GND 2 NC 3 RESET PT7M7812 VCC MR 5 4 1 GND 2 NC 3 RESET PT7M7823 1 RESET 2 GND 3 MR VCC WDI VCC 5 MR 4 PT7M7824 5 4 1 RESET 2 GND 3 RESET PT7M7825 VCC WDI 5 4 1 RESET 2 GND 3 RESET VCC 5 MR 4 SOT23-6 PT7M7342 PT7M7343 PT0109(02/03) PT7M7344 PT7M7345 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 Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 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 PT0109(02/03) 6 Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 µP Supervisor Circuits |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Watchdog Timer Functional Description The PT7M7xxx 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 PT0109(02/03) PFO 7 I/O Line Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 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 7xxxL, 7xxxM 4.5 5.0 5.5 V Supply Voltage for 7xxxT, 7xxxS 3.0 3.3 5.5 V Supply Voltage for 7xxxR 2.7 3.0 5.5 V Supply Voltage for 7xxxZ, 7xxxY 2.4 2.5 5.5 V VIH Input High Voltage 0.7VCC VIL Input Low Voltage TA Operating Temperature VCC PT0109(02/03) Descr ip t ion Test C on d it ion s V 0.3VCC -40 8 85 V O C Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 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 PT7M7xxxL PT7M7xxxM PT7M7xxxT PT7M7xxxS PT7M7xxxR PT7M7xxxZ PT7M7xxxY 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 PT7M7803 and PT7M7345 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 PT7M7811/7812 10 20 30 PT7M7823/7824/7825 35 52 75 PT7M7342/7343/7344 60 µA kΩ * 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. PT0109(02/03) 9 Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 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 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 PT0109(02/03) 10 Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 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 PT0109(02/03) 11 Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 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 PT0109(02/03) 12 Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 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 PT0109(02/03) 13 Ver:1 Data Sheet PT7M7803/7809-7812/7823-7825/7342-7345 µP Supervisor Circuits |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Notes Pericom Technology Inc. Email: [email protected] Web-Site: www.pti.com.cn, www.pti-ic.com China: No. 20 Building, 3/F, 481 Guiping Road, Shanghai, 200233, China Tel: (86)-21-6485 0576 Fax: (86)-21-6485 2181 Asia Pacific: Unit 1517, 15/F, Chevalier Commercial Centre, 8 Wang Hoi Rd, Kowloon Bay, Hongkong Tel: (852)-2243 3660 Fax: (852)- 2243 3667 U.S.A.: 2380 Bering Drive, San Jose, California 95131, USA Tel: (1)-408-435 0800 Fax: (1)-408-435 1100 Pericom Technology Incorporation reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom Technology does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom Technology product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom Technology Incorporation. PT0109(02/03) 14 Ver:1