System Reset (with watchdog timer+battery back-up) MM1106 MITSUMI System Reset (with watchdog timer+battery back-up) Monolithic IC MM1106 Outline This IC combines the popular watchdog timer with a battery back-up, resulting in an IC that is easier to use. The watchdog timer has a built-in power ON reset function, and both the timer and the battery back-up section have low current consumption. Features 1. Low current consumption 2. Watchdog timer Detection voltage CT charging current 3. CS CS detection voltage Output voltage low level 4. Battery back-up Power supply switching voltage Input/output voltage difference (normal) Input/output voltage difference (back-up) Loss current (current consumption for back-up) 270µA typ. 4.2V typ. -0.24µA typ. 4.4V typ. 0.1V typ. 3.3V typ. 0.3V typ. 0.3V typ. 0.1µA typ. Package SOP-14B (MM1106XF) DIP-14A (MM1106XD) Applications 1. 2. 3. 4. 5. Fax machines Photocopiers Air conditioners Control equipment Sequencers, etc. Absolute Maximum Ratings (Ta=25°C) Item Power supply voltage Voltage applied to input pin Voltage applied to output pin VOUT output current 1 VOUT output current 2 Allowable loss Storage temperature Symbol VCC max. VIN VOUT IL1 IL2 Pd TSTG Ratings -0.3~+7 -0.3~VCC+0.3 ( =< +7) -0.3~VCC+0.3 ( <= +7) 50 120 300 -40~+125 Units V V V mA µA mW °C Note: IL1 expresses output current value from main power supply (VCC) and IL2 expresses output current value from battery (VBAT). System Reset (with watchdog timer+battery back-up) MM1106 MITSUMI Recommended Operating Conditions Item Power supply voltage RESET sink current CS sink current VOUT output current 1 VOUT output current 2 Clock input high level voltage Clock input low level voltage Clock monitoring time setting Clock rise and fall times Power supply voltage rise times Power supply voltage fall times TC pin capacitance Operating temperature Electrical Characteristics Item Consumption current RESET detection voltage Detection voltage temperature coefficient R Hysteresis voltage R CK input threshold CK input current Output voltage R H Output voltage R L Output sync current R Output source current R CT charge current CS detection voltage Detection voltage temperature coefficient C Hysteresis voltage C Output voltage C H Output voltage C L Output sync current C Output source current C Power supply switching voltage Detection voltage temperature coefficient B Hysteresis voltage B I/O voltage difference 1 (normal) I/O voltage difference 2 (backup) Symbol VCC IOLR IOLC IL1 IL2 VCKH VCKL TWD TRCK, TFCK TRVCC TFVCC CT TOP Ratings +2.5~+6.5 0~1.0 0~500 0~30 0~80 2.0< <0.4 1~1000 <100 100< 50< 0.0002~2 -25~+75 Units V mA µA mA µA V V mS µS µS µS µF °C (Except where noted otherwise, Ta=25°C, VCC=5.0V, VBAT=3.0V) Symbol ICC VSLR VSR T VHYSR VTH IIH IIL VOHR VOLR IOLR IOHR ICT1 ICT2 VSLC VSC T VHYSC VOHC VOLC IOLC IOHC VBB VBB T VHYSB VSAT1 VSAT2 Measurement conditions VCC=5.0V, IO=0µA VCC : Hi Lo Min. Typ. Max. Units 270 400 µA 4.00 4.20 4.40 V ±0.01 ±0.05 %/°C VCC : Lo Hi 0.05 0.8 0.10 1.2 VCK=5.0V 0 VCK=0V -15 -7 IRESET=-5µA 4.0 4.5 IRESET=1.0mA 0.3 VCC=3.5V, VRESET=1V 1 2 VRESET=4.5V 8 15 VTC=0.7V during watchdog timer operation -0.48 -0.24 VTC=0.7V during power ON reset operation -0.48 -0.24 VCC : Hi Lo 4.20 4.40 -------------------------------------------- -------------------------------------------- -------------------------------------------- -------------------------------------------- 0.20 2 1 -2 V V µA V V mA µA -0.16 µA -0.16 µA 4.60 V 0.5 ±0.01 ±0.05 %/°C VCC : Hi Lo VCC=5.0V, ICS=1µA VCC=3.5V, ICS=1µA VCC=3.5V, VCS=0.3µA VCC=5.0V, VCS=4.5V VCC : Hi Lo 0.05 4.50 0.5 50 3.15 0.10 4.65 0.1 1.0 75 3.30 0.20 0.4 3.45 V V V mA µA V ±0.01 ±0.05 %/°C VCC : Lo Hi VCC=5.0V, IO=-30mA IO=-80µA, VBAT=3.0V 0.05 0.10 0.3 0.3 0.20 0.5 0.4 V V V System Reset (with watchdog timer+battery back-up) MM1106 MITSUMI Item Symbol Measurement conditions Loss current ILOSS Reverse current External PNP transistor base-driving current Max. Units VCC=0V, IO=0µA, VBAT=3V 0.1 µA IOREV VCC=5.0V, IO=0µA, VBAT=0V 0.1 µA IBASE VCC=5.0V, VOUT=4.2V, VTB=4.3V VCC input pulse width TPI VCC CK input pulse width TCKW CK CK input cycle TCK CK Watchdog timer monitoring time 1 5.0V 4.0V tCKW or tCk Min. 2 Typ. 5 mA 8 µS 20 µS 20 µS TWD CT=0.02µF 50 100 150 mS TWR CT=0.02µF 1 2 3 mS 50 100 150 mS * Watchdog timer reset time 2 * Reset hold time for power supply rise 3 TPR VCC : Lo Hi (100µS), CT=0.02µF * --------------------------------------------- RESET delay time TPDR CS delay time TPDC -------------------------------------------- VCC : Hi Lo (50µS), CLR=15pF, RLR=22kΩ VCC : Hi Lo (50µS), CLC=15pF 10 µS 10 µS TRR CLR=15pF, RLR=22kΩ 4 µS RESET fall time TFR CLR=15pF, RLR=22kΩ 4 µS CS rise time TRC CLC=15pF 4 µS CS fall time TFC CLC=15pF 4 µS RESET rise time -------------------------------------------- Notes: 1 Monitoring time is the time from the last pulse (negative edge) of the timer clear clock pulse until reset pulse output. In other words, reset output is output if a clock pulse is not input during this time. 2 Reset time means reset pulse width. However, this does not apply to power ON reset. 3 Reset hold time is the time from when VCC exceeds detection voltage (VSHR) during power ON reset until reset release (RESET output high). 4 Watchdog timer monitoring time (TWD), watchdog timer reset time (TWR) and reset hold time (TPR) during power supply rise can be changed by varying CT capacitance. The times are expressed by the following formulae. Example : when CT=0.02µF * * * ------------------------------------------------ * . . TPR =. 100mS TPR (mS) =. 5000 CT (µF) . TWD (mS) =. 5000 CT (µF) TWD .=. 100mS TWR (mS) .=. 100 CT (µF) TWR .=. 2mS 5 The voltage range when measuring output rise and fall time is 10~90%. 6 The IC can be made to operate only as a reset IC with delay during Vcc rise by connecting the RCT pin to GND. 7 VCC rise time should be 100µS or more, and fall time should be 50µS or more. * * * System Reset (with watchdog timer+battery back-up) MM1106 MITSUMI Pin Description Pin No. Pin name 1 GND Ground 2 N.C NON CONNECT CK Clock input 3 -------------------------------------------- Function 4 RESET 5 N.C NON CONNECT 6 TC Capacitor for setting power ON delay and timer monitoring times 7 RCT Watchdog timer stop (when connected to GND); timer time adjustment 8 CS Chip select output 9 TB External power transistor drive pin 10 VBAT Back-up power supply input 11 N.C NON CONNECT 12 VOUT Back-up voltage output 13 N.C NON CONNECT 14 VCC Main power supply Reset output Note : Connect external transistor when output current is more than 50mA. Block Diagram System Reset (with watchdog timer+battery back-up) MM1106 MITSUMI Timing Chart VHYSC VSLC VHYSR VSLR VHYSB VBB VCC CK VTH CT TPR RESET CS 4.7V VOUT 2.7V 3.0V VBAT TPR TWD TWR