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M5295AP Dataheets PDF



Part Number M5295AP
Manufacturers Mitsubishi
Logo Mitsubishi
Description WATCHDOG TIMER
Datasheet M5295AP DatasheetM5295AP Datasheet (PDF)

MITSUBISHI M5295AL/P/FP WATCHDOG TIMER DESCRIPTION M5295A is a semiconductor integrated circuit which is designed for System Reset to detect +5V power supply. This IC keeps the operation microcomputer watching. When the system is abnormal,it generates Reset output until the system returns to normal states of the System. It is possible to vary the two detective voltage by connecting the resistor,so it is suitable to high quality and high performance system. PIN CONFIGURATION .

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MITSUBISHI M5295AL/P/FP WATCHDOG TIMER DESCRIPTION M5295A is a semiconductor integrated circuit which is designed for System Reset to detect +5V power supply. This IC keeps the operation microcomputer watching. When the system is abnormal,it generates Reset output until the system returns to normal states of the System. It is possible to vary the two detective voltage by connecting the resistor,so it is suitable to high quality and high performance system. PIN CONFIGURATION (TOP VIEW) 8 7 6 5 4 3 2 1 ADJ2 RST2 Vcc ADJ1 GND RST1 TC WD FEATURES •Watch Dog Timer •Power on Reset Timer •Low circuit current 0.8mA(Typ,Vcc=5V) •Wide Range of power supply Outline 8P5(AL) WD TC RST1 1 2 3 4 8 7 6 5 APPLICATION Microcomputer Systems ADJ2 RST2 Vcc ADJ1 RECOMMENDED OPERATING CONDITIONS Supply voltage...........................................4V to 15V Rated supply voltage............................................5V GND Outline 8P4(AP) 8P2S-A(AFP) BLOCK DIAGRAM 49.6k 51.2k F.F F.F + - + + - 20.4k 18.8k W.D.T F.F 20k 30k 1.24V REFERENCE VOLTAGE GENERATOR CIRCUIT 1 WD 2 TC 3 RST1 4 GND 5 ADJ1 6 Vcc 7 RST2 8 ADJ2 MITSUBISHI ELECTRIC ( 1 / 8 ) MITSUBISHI M5295AL/P/FP WATCHDOG TIMER ABSOLUTE MAXIMUM RATINGS (Ta=25°C,unless otherwise noted) Symbol Vcc VIN VOUT IOUT Pd K Topr Tstg Parameter Supply voltage Input voltage Output voltage Output current Power dissipation Thermal derating Operating temperature Storage temperature Ta≥25°C Conditions Ratings 15 -10 to +10 15 10 800(SIP)/625(DIP)/440(FP) 8(SIP)/6.25(DIP)/4.4(FP) -20 to +75 -55 to +125 Unit V V V mA mW mW/°C °C °C ELECTRICAL CHARACTERISTICS (Ta=25°C,Vcc=5V,unless otherwise noted) (1)DC FEATURES Symbol IIH IIL VIH VIL IOUT IIN VVH3(H) VVH3(L) VOL ILEAK VTH1 VTH2(H) VTH2(L) ∆VTH2 V5 V8 RST1 RST2 Icc ADJ1 voltage ADJ2 voltage RST1 on voltage RST2 on voltage Circuit current ADJ1 ADJ2 RST1 RST2 Vcc Vcc=1.2V,RL=4.7k Vcc=1.2V,RL=4.7k 0.8 Vcc detective voltage(2) Vcc Output voltage Output leak current Vcc detective voltage(1) Parameter WD input current Pin WD VIN=5V VIN=-5V WD input voltage TC output current TC input current Threshold voltage of watch dog timer WD TC TC TC RST1 RST2 Vcc IOUT=1mA VOUT=15V 4.05 4.5 4.45 0.05 1.17 1.07 4.25 4.7 4.6 0.1 1.46 1.34 VIN=1.5V VOUT=4.2V 3.7 1.7 3.3 4 2 0.1 4.3 2.3 0.5 5 4.45 4.9 4.75 0.2 1.75 1.61 0.5 0.5 1.5 Test conditions Min. 0.06 0.05 2 0.8 -1 Limits Typ. 0.15 -0.1 Max. 0.25 -0.15 Unit mA mA V V µA mA V V V µA V V V V V V V V V (2)AC FEATURES Symbol tWD Parameter Watch dog timer Pin RST1 Test conditions Min. Limits Typ. 1.1•C•R1 C=0.1µF,R1=10kΩ C=0.1µF,R1=10kΩ R1=10kΩ C=0.1µF,R1=10kΩ 40 3 20 10 0.5 1.1 0.5•C•R1 0.2 0.5 830•C 83 220 1.1 1.7 Max. Unit s ms s ms s µs µs µs µs tRST(1) Reset timer (1) RST1 tRST(2) tWD IN td1 td2 Reset timer (2) Input pulse watch Transmittal delay time RST1 WD RST1 RST2 MITSUBISHI ELECTRIC ( 2 / 8 ) MITSUBISHI M5295AL/P/FP WATCHDOG TIMER OPERATING EXPLANETION Vcc VTH2(H) VTH1 0V VTH2(L) VTH1 VTH3(H) VTH3(L) TC 0V VIN 0V RST1 0V RST2 0V tRST(1) tWD tRST(2) 12 3 4 5 6 7 8 9 10 11 1 The Vcc rises up to 0.8V,then Reset1 and 2 generate Low output,and Rising up to 4.25V,charge of C1 begins. 2 The Vcc rises up to 4.7V,then Reset2 generates high. 3 , 4 The voltage at TC pin is 2V,then Reset2 generates high,when 4V,C1 is discharged and Reset1 generates Low. 5 The voltage at TC pin falls to 2V,then Reset1 generates high unless normal clock signal is entered to WD pin,Reset1 repeats this operation. Before the voltage at TC pin reaches 4V,if normal 7 6 , clock signal is entered to WD pin,Low Reset1 is canceled. 8 , 9 In the case of entrance of abnormal signal input, as the waveform of TC pin repeats charge and discharge of Reset1 alternatively from 2V to 4V,the Reset1 repeats high and low output operation. 10 The Vcc falls to 4.6V,then Reset2 generates Low, this detective voltage has a 100mV hysteresis. 11 When Vcc goes down to 4.25V(VTH1),the status of TC pin is switched to discharge.When the potentional at TC pin is detected being VTH3(H) or VTH3(L),the status of Reset1 becomes "low". MITSUBISHI ELECTRIC ( 3/ 8 ) MITSUBISHI M5295AL/P/FP WATCHDOG TIMER TERMINOLOGY tRST1:Time required for TC pin potential to rise from 0V VTH3(L) when Vcc is being applied. tWD: Time required for TC pin potential to rise from VTH3(L) to VTH3(H). tRST2:Time required for TC pin potential to go down from VTH3(H) to VTH3(L). 2.Pin 1 (WD Pin) Input Frequency, Input Pulse Width,Charge Time and Discharge Time When input to WD pin 1 is normal,TC pin 2 output waveform is as shown below: (Vcc=5V) 4V Pin 2 xV 1.Pin 2 (TC Pin) Charge Time and Discharge Time When input to WD pin is abnormal,TC pin output waveform is as shown below: 4 •Vcc 5 TC 0V 2 •Vcc 5 t1=C•R1•in tRST(1) tRST(2) t2=1000•C•in -1 (discharge time) -3 Input 2V t1 t2 tWDIN 3 (charge time) 5-x R1 1000 2• +1 x-5 (discharge time) -3 tWD tR.


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