M51955A MITSUBISHI | Alldatasheet
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MITSUBISHI <Dig./Ana. INTERFACE> MS 1955A,B/M51956A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES
DESCRIPTION
M51955A,B/M51956A,B are semiconductor integrated circuits PIN CONFIGURATION (TOP VIEW) ideal for detecting input voltage and resetting all types of logic circuits such as CPUs. Fe Fe OUTPUT They include a builtin delay circuit to provide a retarda- = [anc tion time (200usec typ.). B33 GND They find extensive applications, including circuits for zs input battery checking, level detecting and waveform shaping. & 3 Fy curry vourace
FEATURES
© Few external parts Outline SP5T © Low threshold operating voltage (Supply voltage to keep been erence nese O.6V (TYP,) at Ry = 22kQ @ Sudden change in power supply has minimal effect on the INPUT @_ @ [2] surrvy voutace ICs ne B] GZ as [B] ovreu? © Wide operation range of detecting input pin. ... Narrower oxofa] a a fB]ne ranges of -0.3V ~ Vec or -0.3V ~ 7V (Input voltage ~ detecting type) (M51955B, M51956B) Outline 8P2S-A © Suitable for high supply voltage circuit with simple circuit Ne: NO CONNECTION structure (M51955B, M51956B) @ Permits easy configuration of circuit for protection against reverse connection or surges. (M51955B, M51956B) © 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 Supply voltage range... 2. ee eee eee ee 2UAUIV BLOCK DIAGRAM MS51955A,B suPPLY M51956A, 8 SUPPLY A: Builtsin Losd OLTAGE A Builtin Load ee 8. Oven collar - v . 8 Open Cottector a! Beart H ' rh ; 8 input C) Y O oO QC) ourrut n c C DELAY \\ \\ DELAY ' | 1.25V CAPACITOR 1. 25 CAPACITOR nD GND ee MITSUBISHI PR ; 727
MITSUBISHI <Dig./Ana. INTERFACE) M51955A,B/M51956A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES FUNCTION DIAGRAM M51955A, B MS1956A, B INPUT INPUT VOLTAGE VOLTAGE ‘ | ‘ “ H OUTPUT OUTPUT Leo} L] STATE Po] | [ra] STATE [ia Pi — = L t™=200 sec ‘ tg=200 nsec ABSOLUTE MAXIMUM RATINGS (12=25¢. uniess omermse noted) ‘Symbol Parameter Conditions Ratings T Une Veo Supply voltage | 18 Vv Isink T Output Sink Current _ i - i 6 Toma | A Type (Output with constant curtent toad) if Veo I Vo Output voltage | ea Se ian ——_—_-- v ef Bee Open eater out ee 1 ee sit aso : Ps Power dissipation a ee P FLAT 300 | eg « | Thermat Deran Ta -25C oP st —- se | mnwse So— a 2 ee Topr Operating temperature ia —30— +85 Te —Teer__ Serene A Tsig Storage temperature | i = 40 — +125 c ELECTRICAL CHARACTERISTICS (12=250. uniess omens note) M51955A, M51956A M51955B M51956B +. | Min Typ | Max A a LO Vs___| Detecting voltage : _ veo | tes | a0 |v S Hysterisis volt i =5V | a m\\ avg [vires votage Moov ts Vs/4T _| Detecting Votage lemperature Coetticient os 0.01, 4 %/C — ee ev | Ta=—30~ +85. Vec=7V , 70.3 | = Veco | Vin | Input wotage Range Ton 7900 te Meee nO | Oey im Input Caen Vin=.25¥ Toa} 00 | 200 a ee Te AVoo=8V — 30 | sop toa _| belay Tine {Taz —20- 4850 Te} 20°F s00 fxs Vsat Output Saturation Voltage ee — — | 02 0.4 | v H reset type Voc = 5V. Vin >1,35V. Isink = 4mA. y vosnou Onceana va TCiesetigeiimun | AL=eeKa, vsatsoav | — [oar] 06] y ore Pees Operas wens __| Be nti AL= OOK. Vsars04av) — | 0.55 _ pe 8 es eee ton | Output Leakage Coren a = [= A ° " exaot * Type B, Ta= —30~ +85 _ — 1 uA eee oe ee 2 = Too | Output Load Curent [ WA ves=8¥. vo= V2 vee <~@ | =e] 0 Vor | Outout High Vokage Toe A ee=0.2fvec-008} — |v Note: Delay tme can be changed by changing delay capactor tor external deray capsctor pes (ease rele to typalcharacenisis 7-28 ae TSS
MITSUBISHI <Dig./Ana. INTERFACE> MS1955A,B/M51956A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES TYPICAL CHARACTERISTICS TYPICAL CHARACTERISTICS DETECTING VOLTAGE VS. THERMAL DERATING AMBIENT TEMPERATURE {MAXIMUM RATING) (Input voltage detecting series) “ EEL TTT Bow ST | € ee ee a seat LL ‘ P| domsh _| gre aan : Pee Cec 3 2 i e | | | e SD 3 1,23] | TES LT tT i Ss, 5 25 50 75 100 125 ear) —20 0 20 40 60 80 100 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 PTT TT FFT si” ; AS ee | q 20 PET] Pees CTE] ied LE g Fa — 5 2 ia 1,23] 2 50) Ta=85'C Ga. vat | tt Lit 0 4 8 12 16 20 0 4 8 12 16 20 SUPPLY VOLTAGE Vee (V) SUPPLY VOLTAGE Vec (V) DELAY TIME VS. AMBIENT TEMPERATURE THRESHOLD OPERATING ‘VOLTAGE (M5195XX, Built-in capacitor type) ({L] reset type) 350 1.0) 300 Po Lt | tt ty a .= : Pit Sot LL | | fee] : = 200 | ce g 06 2 eee Z | | LAN peer F sol SOL 2 oa A\\\\ | Z 100 2 / RL =100k 9 [| | tt yy g 02 it LE Z| Wea ° 0 SS AMBIENT TEMPERATURE Ta (°C) SUPPLY VOLTAGE Voc (V) J MITSUBISHI f ELECTRIC 7-29
MITSUBISHI <Dig./Ana. INTERFACE> MS 195SA,B/MS1956A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES OUTPUT LOAD CURRENT VS. OUTPUT SATURATION VOLTAGE VS. OUTPUT VOLTAGE OUTPUT SINK CURRENT (M519XXA) zo - EEE EEL : »s Ae ca 0.2| a) Sees 8 a_i g Spee] vos TO veri] = 3-7 S , eC TC 3 eee : . “COOP a, ttt tt ttt | o 1 2 3 4 5 6 0 4 8 i216 OUTPUT SINK CURRENT Isink {im} OUTPUT VOLTAGE Vo (Vi CIRCUIT CURRENT VS. SUPPLY VOLTAGE (M51957B, M5 1958B) oot |] TEE TT Ty - ELE TT Te 5 of fn | OCT tere © ool Lex EFT a er soxmse| | 2 oop | | Pewee] | oe COrrEror SUPPLY VOLTAGE Vee {V) ¢ MITSUBISHI 7-30 W ELECTRIC :
MITSUBISHI <Dig./Ana. INTERFACE> MS 195SA,B/M51956A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES EXAMPLE OF APPLICATION CIRCUIT M5195XX Series Reset Circuit Voc SUPPLY t SUPPLY @ VOLTAGE 3 Ro © VOLTAGE M51955x | RESET O- O O74 RESET( RESET) omer OGno O6np Note 1. When the detecting supply voltage is 4.25V, Note 3. If M5195XX and the logic circuit have a common M51951, MS1952, M51953 and M51954 are used. In power supply, type A (built-in load type) can be applied the case, Ry and Ry are not necessary. whether a pull-up resister is included in the logic circuit When the voltage is anything except 4.25V, M51955, or not. M51956, M51957 and MS1958 are used. In this case, Note 4. The logic circuit preferably should not have a pull- 4 4 Ri + R down resistor, but if one is present, add load resistor RL th I 5 x te iv ‘ . the detecting supply voltage Is 1.28 x >I to overcome the pull-down resistor. approximately. The detecting supply voltage can be set. — Note 5. When the reset terminal in the logic circuit is of between 2V and 15V. the low reset type, M51951, M51953, M51955 and Note 2. When the delay time is short, M51951, M51952, 51957 are used and when the terminal is of the high M51955 and M51956 are available. These ICs have a reset type, M51952, M51954, M51956 and M51958 are delay capacity and the delay time is about 200us. used. If a longer delay time is necessary, M51953, M51954, = Note 6. When a negative supply voltage is used, supply M51957 and M51958 are used. In the case, the delay voltage side of M5195XX and the GND side are con- time is about 0.34 x Cd(pF) usec. nected to negative supply voltage respectively.
9 MITSUBISHI
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MITSUBISHI <Dig./Ana. INTERFACE> MS1955A,B/M51956A,B VOLTAGE DETECTING, SYSTEM RESETTING IC SERIES Application to High Supply Voltage Circuit The absolute maximum rating of supply voltage for using resistors, these ICs can be used in high supply voltage M51955B, M51956B is 18V. By dividing supply voltage circuit. SUPPLY VOLTAGE Vee Ri [> [surrey gm Q VOLTAGE Re | ~ Ea i} Oo oO Qa i In the above figure, the voltage applied to M5195XB is as follows, The voltage range is set between 2V and 17V. fs ee ee - slo] + (Ri//R3)°V, ary ON: Rp + (Ry//R3) Ro * (a * Veo -(Ri//R3) * leo at Q, OFF: — Ra Rg) Ra + (Ri//Ra) = Pit Rs Rill = RR Vee: Circuit current of M5195XB Vee): Base-emitter voltage ~ 0.7V (Transistor Q;) This circuit provides reverse protection (in case of Using the application circuit, the directly rectified or reverse connection of power supply) and surge protection. smoothing commercial voltage can be applied as shown below. SUFPLY. Q VOLTAGE COMMERCIAL AC POWER SUPPLY +h Oo © d MITSUBISHI 732 ate MESURS ;