MS1841P MITSUBISHI | Alldatasheet
Document overview
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Technical content
DESCRIPTION
The M51841 P /M5E555P monolithic timing circuit is a highly stable controller capable of producing accurate time delays, or oscillation. Additional terminals are provided for triggering or resetting, if desired. In the time delay mode, the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, both the free running frequency and the duty cycle are accurately controlled by two external resistors and capacitor. The circuit will trigger and reset on falling waveforms, and the output structure can source or sink up to 200mA or drive TTL circuits.
FEATURES
- Timing from microseconds through minutes
- Operates in both astable and monostable modes
- Adjustable duty cycle
- High current output can source or sink 200mA
- Output can drive TTL
- Temperature stability of 0.005% per °c
- Normally on and normally off output
- Interchangeable with the signetics NE555 in pin configu ration and characteristics
APPLICATIONS
- Precision timing
- Pulse generation
- Sequential timing
- Time delay generation SINGLE TIMER PIN CONFIGURATION (TOP VIEW)
7 DISCHARGE
5 CONTROL VOLTAGE
8-pin plastic 01 L package
- Pulse width modulation RECOMMENDED OPERATING CONDITIONS
- Pulse position modulation
- Missing pulse detector BLOCK DIAGRAM Vee CONTROL VOLTAGE 5 }----t---t SUB GND R s
- MITSUBISHI RESET 2-203
ABSOLUTE MAXIMUM RATINGS (Ta=25t, unless otherwise noted) Symbol Parameter Conditions Limits Vee Supply voltage 18
10 Output current 200
Topr Operating ambient temperature ~20- + 75 T8tg Storage temperature -40-+125 ELECTRICAL CHARACTERISTICS (Ta=25t, unless otherwise noted) Symbol Parameter Test conditions Vee Supply voltage Vcc=5V, No load lee Circuit current Vee=15V. No load Vee=5V VeNT Control voltage Vee=15V VTH Threshold voltage ITH Threshold current VT T rigger vol tage IT Trigger current VR Reset vol tage IR Reset current Vee=5V,l sink=5mA Vee=15V, Isink =10mA VOL Low output voltage Vee=15V,l sink=50mA Vee=15V,l sink=100mA Vee=5V, Isource=100mA VOH High output voltage Vee=15V,lsource";'100mA TYPICAL CHARACTERISTICS 1.0 0.8 z 0.6 c::> .... <0: eo 0.4 <n <n a:: ~ 0.2 2-204 THERMAL DERATING (MAXIMUM RATING) " "- "" '"" '~, 25 50 75 100 125 AMBIENT TEMPERATURE Ta ("C) ;;;: .... ~ a: a: ::0 u t:: ::0 U U
- . MITSUBISHI Limits Min Typ Max 4.5 16 3 6 10 15 2.6 3.3 4 9 10 11 ~3Vee 0.1 0.25 lhVee 0.5 1.0 0.7 1.0 0.1 0.25 0.35 0.1 0.25 0.4 0.75 2.0 2.5 2.75 3.3 12.75 13.3 SUPPLY VOLTAGE VS CIRCUIT CURRENT 0 5 7.5. 10 12.5 15 SUPPLY VOLTAGE Vee (V) Unit V mA mW Unit V mA mA V V V J.lA V J.lA V mA V V V V V V
2.5 6 2.0 > b o w 1.5 <.:J ~ 1.0 ~ >- 6 o. 5 I <.:J I ...J w <.:J >-...J HIGH OUTPUT VOLTAGE VS OUTPUT SOURCE CURRENT VCC=15V II ~a-7 SoC 1-1-~ r::. I-' T a =2S"C I I I Ta=-20"C 10 10 2 10 3 OUTPUT SOURCE CURRENT I SOURCE (rnA) LOW OUTPUT VOLTAGE VS OUTPUT SINK CURRENT ~ o. --Ta=7S"C
1 I I-I '" ,
-::J 0 ...J 0.0 1 T a -25"C Ta 20"C IIII 3 5 7 10 3 57102 3 5 7 10 3 OUTPUT SINK CURRENT I SINK, (rnA) PROPAGATION DELAY VS LOWEST VOLTAGE LEVEL OF TRIGGER PULSE 2S0.-----.,--"""7--,----, 00 ~»1/3VCC GND ...J w o ><t <.:J it LOWEST VOLTAGE LEVEL OF TRIGGER PULSE VT (xVCC) ...J w <.:J >-...J > >- ~ o. >-::J 0 5 '" 0 3 ...J MITSUBISHI LINEAR ICs MS1841P/MSESSSP SINGLE TIMER LOW OUTPUT VOLTAGE VS OUTPUT SINK CURRENT VCC= S V +~ I 120"~ rr Ta 25"C Ta -7S"C IL 1 0.0 1 3 5 7 10 3 5 710 2 "' .s 40 I b w ~ ::::> 20 tL :;; ::::> ~ 10 z a a a a a OUTPUT SINK CURRENT I SINK (rnA) MINIMUM PULSE WIDTH VS LOWEST VOLTAGE LEVEL OF TRIGGER PULSE >l/3Vc; Vcc=sJ ~ GND I t- 'lVcc=lJV ~ 'P 00 0.1 0.2 0.3 0.4 LOWEST VOLTAGE LEVEL OF TRIGGER PULSE VT (xVccl 0.5
- MITSUBISHI .... ELECTRIC 2-205
In this mode operation, timer function an one·shot. The external capacitor is initially held discharged by a transistor internal to the timer. Applying a negative trigger pulse to Pin ® sets theflip·flop, driving the output high and releasing the short·circuit across the external capacitor. The voltage across the capacitor increases with the time constant r = RaoCa to 2/3 Vee, where the comparator resets the flip·flop and discharges the external capacitor. The output is now in the low state. The circuit triggering Monostable multivibrator Vcc RESET Ra RL 4 8 7 3 OUTPUT M51841P M5E555P '---6 '1'"' r 2 1 TRIGGER 7 'rr ,uF Astable operation With the circuit connected as shown and it will trigger itself and free run as a multi vibrator. The external capacitor charges· through Ra and Rb and discharges through Rb only. Through the duty cycle is set by the ratio of these two resistors, and the capacitor charges and discharges between 1/3 Vee and 2/3 Vee. Charge and discharge times, and therefore frequency, are independent of supply voltage. The free running fre· Astable multivibrator r M51841P M5E555P 3t-----oOUTPUT MITSUBISHI LINEAR ICs MS1841P/MSESSSP SINGLE TIMER takes place when the negative going trigger pulse reaches 1/3 Vee and the circuit stays in the output high state until the set time elapses. The time the output remains in the high state is 1.1 Ra· Ca and can be determined by the graph. A negative pulse applied to Pin @ during the timing cycle over again beginning on the positive going edge of the reset· pulse. If reset function is not used, Pin @) should be connected to Vee to avoid false resetting. The delay time is given by: td = 1.1 Rae. TIME DELAY VS R a, C a CAPACITANCE Ca (,u F) quency versus R a, Rb and C a is shown in the graph. The charge time (output high) is given by: t1 = 0.693 (Ra + Rb)·C a and discharge time (output low) by: t2 = 0.693 Rb 0 C a Through the free running frequency is given by: f = 1/(tl+ t2) = 1.44/ {(R a +2R b)oCa} and the duty cycle by: D = Rb/(Ra + 2R b) FREE RUNNING FREQUENCY VS Ra. Rb and Ca '" () OJ U Z <t u 10' 10 2 FREE RUNNING FREQUENCY f (Hz) 2-206 • MITSUBISHI .... ELECTRIC