M51945A MITSUBISHI | Alldatasheet
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MITSUBISHI <Dig./Ana. INTERFACE> M5 1945A,B/M51946A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES
DESCRIPTION
M51945.A,B/M51946A,8 are semiconductor integrated circuits PIN CONFIGURATION {TOP VIEW) designed for input voltage detection and for resetting of all types of logic circuits such as CPUs. a a [5] output Possible applications are extensive, including circuits for $ § fa] no battery checking, level detecting and waveform shaping. $$ Bono S 5 [zy ineut FEATURES 22 SUPPLY VOLTAGE © Few external parts ope . . Low threshold operating voltage (Supply voltage to keep Outline 5P5T beeen eee eee ees O.6V (TYP.) at RL = 22kQ © Sudden change in power supply has minimal effect on the ne TOz zfs) ICs weut B] BSL] surecy voutace © Wide operation range of detecting input pin. . . . Narrower nc Flo S oe [5] oureur ranges of -0.3V ~ Voc or -0.3V ~ 7V ono FB 8 By nc (Input voltage detecting type) © Suitable for high supply voltage circuit with simple circuit Outline 8P2S-A structure (M51945B, M51946B) NC: NO CONNECTION © Permits easy configuration of a circuit for protection against reverse connection or surges. (M51945B, M51946B) © Wide application range © SIL package of the same height as DIP (5-pin SIP) APPLICATION Reset circuit of Pch, Nch, CMOS, microcomputer, CPU and microcomputer, Reset of logic circuit, Battery check circuit, Switching circuit back-up voltage, Level detecting circuit, Waveform shaping circuit, Delay waveform generating circuit, DC-DC converter, Over voltage protection circuit. RECOMMENDED OPERATING CONDITION BLOCK DIAGRAM MSI945A, B MS1946A, B suPPLY SUPPLY A Built.in Loas A: Builtin Load . eu . B: Open Collector . ‘o _ 8: Open Collector ' aq 1 Ql | 3! a) GND GND MITSUBISHI Ja iees 7-1
MITSUBISHI <Dig./Ana. INTERFACE> M5 1945A,B/M51946A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES FUNCTION DIAGRAM M51945A, B M51946A, B INPUT INPUT VOLTAGE VOLIAGE t t OUTPUT " OUTPUT 4 STATE L STATE, t t ABSOLUTE MAXIMUM RATINGS (ta=25°., unless otherwise noted) Parameter Aaings ai Supp worage fo 8 v uur Sink Curent 8
2 Type (Ourpur wth constant current lo v
Vo Output voltage ype (Output with constant toad ee Vv B Type (Open collector output) 18 SP SIP 450 Po Power dissipation mw gp SOP be Sip [as x Thermal Dera Tazase o ’ ° BP SOP 3 me = 307 +85 ELECTRICAL CHARACTERISTICS (12=25%. uniess otnermse notes) M51945A M519468 M519455. M51946B Symbol Parameter Test condition Unit [as [3 [nv Vs/4T | Detecing Votage Temperature Coetieent [ j — | we | Veo | Supply Voltage Range Tas =30- +850 0 Ta=—30~ +850, Voo=7V [=0.3 | — [Vee vin | tnput votage Range v [Tax =so=sest.voo>v faa | || Type A Veo =8¥ [=| 300 | a7 Ice Circuit Current cry Type B Voc = 5V | = | 280 | 420 L reset type Voc = SV. Vin<1.2V, Isink = 4mA Vs Output Saturation Volt ———— 0.2 0.4 v sat tut Saturation Voltage H reset type Veo = 5V. Vin >1.35V, Isink = 4mA y cso Oowatna vo \\ reset ypeminmum | RL=22K@.veaisoav | — | o.67 | 0.8 | veshold Operating Voltage supply votage ore evens OPC oseration FL = 10k. vsarsoav] — | 0.85 | 0.7 | Ourut Leakage © Twe 8 [= [= [fa | put erent — type 8, Ta= —30~ +850 ee ee Type A Voo™=5V. Vo=1/2 Veo [ =ao [as | - | na | Output High Vorage Type A - [veora.2|vecmoof — fv | - Deray ti Response ume when Voe changes HL pop oat Ts | ropagaton Deray Time —e [ Fesponse ime when Vag oranges tH || 2 Ps | 712 ae MES
MITSUBISHI <Dig./Ana. INTERFACE> MS 1945A,B/M51946A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES St th enables TYPICAL CHARACTERISTICS TYPICAL CHARACTERISTICS DETECTING VOLTAGE VS. THERMAL DERATING AMBIENT TEMPERATURE (MAXIMUM RATING) (Input voltage detecting series) = ETT TTT ee set LL = 5
5 Lone _| gs —T _
: ree 2 5 of PRS esa ttt tT | | | EET TTT °9 2 50 78 100-125 1225 =2 0 20 4060 80100 AMBIENT TEMPERATURE Ta (°C) AMBIENT TEMPERATURE Ta (°C) DETECTION VOLTAGE VS. INPUT CURRENT VS. SUPPLY VOLTAGE SUPPLY VOLTAGE {Input voltage detection series) (Input voltage detecting series) 1.28 250 TTT TT] | | OFF ed ye z 20 pepo] ITT Fo | oT SCOCFE} is 2 3 —— Qt rf 5 =m Ta=25c SCOTT bees at | tf Ltt o| 4 8 12 16 2 o 4 @ 12 16 20 SUPPLY VOLTAGE Vcc (V) SUPPLY VOLTAGE Voc (V) THRESHOLD OPERATING VOLTAGE OUTPUT SATURATION VOLTAGE VS. ({L] reset type) OUTPUT SINK CURRENT
1.9 S03
< > SUPPLY VOLTAGE DETECTING “LL = 0.8 y RESET TYPE: Veo=4V__ | 7 E = EXCEPT ABOVE MENTIONED | é B02 Veo™5V" TT TR LET fe} 2 2 4 Li A\\ | 5 7 So EER =22k 2 é yy, is (| i 2 01 FZ Fa A} R= 100k a Fj B02 <a 5 {| Yo | ea Le 0 = oo 0. 02 0.4 0.6 08 1.0 o 1 2 3 4 +5 6 SUPPLY VOLTAGE Veg (V) OUTPUT SINK CURRENT Igink (mA) ¢ MITSUBISHI ELECTRIC 713
MITSUBISHI <Dig./Ana. INTERFACE> M5 1945A,B/M51946A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES CIRCUIT CURRENT VS. SUPPLY VOLTAGE (M5 1945B, M51946B) oo] TT TTT Ty zg LLL TT oq ttt TTT te 2 yee ee] fad | SEE oT eer FT 3 oop Cle h hace | | S| PLT Mesee [| % 4 8 12 16 SUPPLY VOLTAGE Vec (V) EXAMPLE OF APPLICATION CIRCUIT Reset Circuit of M5194XxX Series Voe ! 1 SUPPLY. +-O M5194Xx O OJRESET(RESET) \\ LOGIC CIRCUIT er . a) O GND Note 1. When the detecting supply voltage is 4.25V, Note 4, It is better to use the M5195XX series to cause a M51943 and M51944 are used and R, and R2 are not delay, but if the delay is caused by the M5194XX necessary. series, the delay capacitor Cd is applied between the When the voltage is anything except 4.25V, M51945 and output and GND. M1946 are used. In this case, the detecting supply Note 5. When the reset terminal in the logic circuit is of (Ri + Ro) . the low reset type, M51943 and M51945 are used and voltage is 1.28 x OE (V) approximately. The when the terminal is of the high reset type, M5194 and detecting supply voltage can be set between 2V and M51946 are used. 18V. Note 6. When a delay is necessary at both rise time and Note 2. If the M&194XX and the logic circuit share a fall time, M51945 and M51946 are used and the series common power source, typeA (built-in load type) can be resistors (Rui, Riz) are applied between the output and used whether a pull-up resister is included in the logic GND or instead of R,, and these connect the capacitor circuit or not. between the connection point and GND. The connection Note 3. The logic circuit preferably should not have a point of the capacitor is fixed according to the ratio of pull-down resistor, but if one is present, add load resistor delay at fall/rise time. R,_ to overcome the pull-down resistor. Note 7, When a negative supply voltage is used, the supply voltage side of M5194XX and the GND side are con- nected to GND and the negative supply voltage respectively. MITSUBISHI 714 oales
MITSUBISHI <Dig./Ana. INTERFACE> MS 1945A,B/M51946A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES Switching Circuit to Back-up Power Supply (a) (b) TO THE CIRCUIT DC POWER SUPPLY TO THE CIRCUIT Mabe tRow MADE Porw COMMERCIAL AC COMMERCIAL AC fr | ‘SUPPLY bvottace dvortace input Ro Pe ack up INPUT si9se ° 7 BACK UP O Coeur surely VOLTAGE O} M! CorpuT + SUPPLY VOLTAGE OanD Qano SWITCHING VOLTAGE =1. 25x Fit Racy) SWITCHING VOLTAGE =1,25x Pt Bay) 2 2 Level Detecting Circuit, Waveform Shaping Circuit Because the input threshold of M51945 and M51946 is little dependent on supply voltage and temperature and has hysterisis of 15mV approximately, these ICs can be used in level detecting circuits and waveform shaping circuits. (a) (b) SUPPLY ‘SUPPLY © VOLTAGE O VOLTAGE INPUT 51945 outPuT Anes Rr ineur M51945 ouTPUT o Rit O o Ris Oo INPUT 51946 51946 THRESHOLD VOLTAGE = 1.28V OGND O GND THRESHOLD VOLTAGE =1. 25% THERE (y) DC-DC Converter Step Down Regulator (a) Le (b) ue i ’ a 7 vi » Vou ‘ = La ~~ 2 ee Ss Le a Shae 1 ‘Eo: * i Sirf soe in po" ? ° a en | ° ° CF © Vour®1. 25x FsXFs (yy Vour=1. 25% FX Re (yy Re Re In (b) above, the power supply for M51946B is provided by both R; and R, (and the M51946B internal resistor) and so a high input voltage can be used. MITSUBISHI aie 7-15
MITSUBISHI <Dig./Ana. INTERFACE> M5 1945A,B/M51946A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES Over Voltage “‘Crowbar” Circuit (a) (b) TO THE CIRCUIT FUSE TO THE CIRCUIT SUPPLY SUPPLY pe QVOLTAGE R QVOLTAGE POWER be SUPPLY WITH ° o POWER O] 519458 [oO CURRENT SUPPLY LIMIT 5 Re = DETECTING VOLTAGE =1, 25 F%Fa (yy The over voltage “crowbar” circuit, using a zener diode as Veo shown below, offers lower drive capacity and decreases the capacity for di/dt of SCR. (Enough gate current is needed to turn on SCR.) Expansion of Hysteresis Using M51945B Vee G surety VOLTAGE Re Vw Rt INPUT jouTPuT O o Ch fs) Rs Q,: OFF + ON Threshold voltage = {Ra + Ba) 1 265 (vy + (Ri//Re + Ra) ~ Vsat * (Ri //R2)] R* R3 Q;: ON + OFF Threshold voltage (Ri + Ro) Ri//Ro = ta) : + ~ 2+ (Ra + Veer + Rs Vi Aye (Ry Rall Rey” (1-25(V) “(Rat Ri l/Ra+Rall Rs) ~ eoege” (Ra * Vacs + Rs * Vee!) Where Vsat; M51945B output saturation voltage Veer: Base-emitter voltage © 0.7V (Transister Q;) _ Rit Re = Ra’ Rs Rill, =p Ae Ralls =e Rs
9 MITSUBISHI
MITSUBISHI <Dig./Ana. INTERFACE> MS51945A,B/M51946A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES Application to High Supply Voltage Circuit The absolute maximum rating of supply voltage for resistors, these ICs can be used in high supply voltage M51945B, M51946B is 18V. By diving supply voltage using _ circuit. SUPPLY VOLTAGE Vee Ry CT Tsurecy i Oo} si4xB jo a, In the above figure, the voltage applied to M5194XB is as follows, The voltage range is set between 2V and 17V. Ror [a—F5 5 “Vee - (Ri//R3)* lec} + (Ri//R3)° Vee1 (Ry +R3) at Q, ONS. a. Ry + (Ry//R3) Ras (RES + Veo ~ (Ril! Rs) * lec | Ry + (Ri //R3) = Pi Rs RiIIRs = Re Vec: Circuit current of M5194XB Veer: Base-emitter voltage ~ 0.7V (Transistor Q; ) This circuit provides reverse protection (in case of reverse connection of power supply) and surge protection. smoothing commercial voltage can be applied as shown Using this application circuit, the directly rectified or below. SUPPLY Q.VOLTAGE COMMERCIAL AC POWER SUPPLY 4 ©] sis4xB = |O