[INTERSIL 555 Precision Timer FEATURES GENERAL DESCRIPTION Timing from microseconds through hours The NE/SE 555 monalithic timing circuit is a highly stable Operates in both astable and monostable modes controller capable of producing accurate time delays, or Adjustable duty cycle oscillation. Additional terminats are provided for triggering High current output can source or sink 200mA or resetting if desired. In the time delay mode of operation, Output can drive TTL the time is precisely controlled by one externa! resistor and Temperature stability of 0.005%/C capacitor. For stable operation as an oscillator, the free run- ning frequency and the duty cycle are both accurately APPLICATIONS controlled with two external resistors and one capacitor; the circuit may be triggered and reset on falling waveforms, and the output structure can source or sink large currents or drive TTL circuits. Precision Timing Pulse Generation Sequential Timing Time Delay Generation Pulse Width Modulation Pulse Position Modulation Missing Pulse Detector BLOCK DIAGRAM PIN CONFIGURATIONS a v 8 CONTROL. (OUTLINE DRAWING JD) VOLTAGE to Pn THRESHOLD 2 S, TRIGGER , + piscHance | | FLIP-FLOP [ QuTPUT ae STAGE 1 a + : GROUND [ Dv TRIGGER [| 2 717) DISCHARGE outeuT J crouno OUTPUT (1 3 61) THRESHOLD DESEF ROL RESET 4) gD COL TAGE ORDERING INFORMATION NE555/D 0C to +70C Dice NESSSF 14 pin CERDIP (OUTLINE DRAWING TO-99) NES55N 8 pin plastic DIP vt NES555T TO-99 can GROUND (1) (7) DISCHARGE SE555/0 ~55C to +125C Dice TRIGGER Q) THRESHOLD SESS55F* 14 pin CERDIP SE555T" TO-99 can output (3) () CONTROL VOLTAGE RESET *Add /883B to order number if 883B processing is desired. 63 555 ABSOLUTE MAXIMUM RATINGS Supply Voltage Power Dissipation Operating Temperature Range INTERSIL NES5S oo c ccc ccc ccc eee eee een nee eet e nee ene ene tne ees OC to +70C A) hs So 55C to +125C Storage Temperature Range ........... 6s cece eee eee eens 65C to +150C Lead Temperature (Soldering, 10 seconds), .........-. eee rete eee eens +300 CG ELECTRICAL CHARACTERISTICS TEST CONDITIONS: Ta = 25C, V* = +5V to +15 unless otherwise specified. SE555 NESS5 PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Supply Voltage 45 - 18 45 16 Vv Supply Current Vt=5VRL=2 3 5 3 6 Vt=15VRL=2 10 12 10 16 mA Low State, Note 1 Timing Error Ra, Re = 1k to 100K initial Accuracy C = 0.1pnF Note 2 0.5 2 1, % Drift with Temperature 30 100 50 ppm/?C Drift with Supply Voltage 0.005 0.02 0.01 %/Volt Threshold Voltage 2/3 2/3 X Veco Trigger Voltage vt = 16V 48 5 .2 5 Vv vt =5V 1.45 1.67 1.9 1.67 Trigger Current 0.5 0.5 uA Reset Voltage 0.4 0.7 1.0 0.4 0.7 1.0 Vv | Reset Current 0.1 0.1 mA Threshold Current Note 3 0.1 25 0.1 25 pA Control Voltage Level vi = 15V 9.6 10 10.4 9.0 10 11 V+=5V 29 3.33 3.8 2.6 3.33 4 Output Voltage Drop (low) | V7 = 15V Isink = 10mMA 0.1 0.15 0.1 25 IsiInK = 50mMA 0.4 0.5 0.4 75 Isink = 100mMA 2.0 2.2 2.0 2.5 IsiInK = 200mMA 2.5 2.5 vt =5V v IsInK = 8MA 0.1 0.25 Isink = 5mA 25 35 Output Voltage Drop (high) Isource = 200mA 12.5 12.5 vt=15V { Isournce = 100mMA V+= 15V 13.0 13.3 12.75 13.3 vt=5V 3.0 3.3 2.75 3.3 Rise Time of Output 100 100 Fall Time of Output 100 100 nsec NOTE 1: Supply Current when output high typically 1mA less. NOTE 2: Tested at V+ = 5V and V* = 15V. NOTE 3: This will determine the maximum value of Ra + Re for 15V operation. The maximum total R = 20 MQ. 6:4 555 TYPICAL CHARACTERISTICS NORMALIZED DELAY TIME MINIMUM PULSE WIDTH REQUIRED FOR TRIGGERING 150 : 1 125 =z ~ 100 = a 75 ad 2 = 9 2 = 25 2 t = 0 4 \ a are 0 10 20 30 40 LOWEST VOLTAGE LEVEL OF TRIGGER PULSE % Vt LOW OUTPUT VOLTAGE vs. OUTPUT SINK CURRENT 10 a 1.0 a > | 501 5 > .01 1.0 DELAY TIME vs. SUPPLY VOLTAGE 1.015 1.010 1.005 1.000 0.995 | - -- 0.990 0.985 oO 5 10 15 20 SUPPLY VOLTAGE VOLTS NORMALIZED DELAY TIME SUPPLY CURRENT vs. SUPPLY VOLTAGE 10.0 4 8.0 Ke Eso L wl 6. 5 & 4.0 > & 5 2.0 rq on 0 he , 5.0 10.0 15.0 SUPPLY VOLTAGE - VOLTS LOW OUTPUT VOLTAGE vs. OUTPUT SINK CURRENT 10 Vout - VOLTS 10 20 5.0 10 20 50 100 ISINK mA DELAY TIME vs. TEMPERATURE 1.015 1.010 1,005 1.000 0.995 0.990 0.985 -50-25 0 +25 +50 +75 +100+125 TEMPERATURE C 6-5 2.0 1.8 2 1.6 31.4 1.2 INTERSIL HIGH OUTPUT VOLTAGE vs. OUTPUT SOURCE CURRENT 425C O 1.0 +126C 2 00.8 > 1 0.6 a Loa 0.2 Vout VOLTS PROPAGATION DELAY nsec BV < vt < 15V_ 0 10 20 50 10 20 50 100 isouRCE mA LOW OUTPUT VOLTAGE vs. OUTPUT SINK CURRENT 10 = 15V 1.0 +25C > -55C OTT 25eC 01 1.0 10 100 IsINK. MA PROPAGATION DELAY vs. VOLTAGE LEVEL OF TRIGGER PULSE 300 250 200 150 100 +25C 70C 50 +125C 0 0 10 20 an 40 LOWEST VOLTAGE LEVEL OF TRIGGER PULSE % Vt 555 APPLICATION INFORMATION MONOSTABLE OPERATION ve oe ve eee ep | | < $ FL 3 Ra RESET 7 ~- TRIGGER INPUT 4 8 | f o-~4 2 7 ] | on T 3 BL oo T oorror] | SnTEee T T .01uF In this mode of operation, the timer functions as a one-shot. initially the external capacitor (C) is held discharged by a transistor inside the timer. Upon application of a negative trigger pulse to pin 2, a flip-flop is set which releases the short circuit across the external capacitor and drives the INTERSIL TIME DELAY vs. Ra, Rg AND C 100 . 0 * + = iRy + Rp) | w 1 So te O1 Oo a _q 0.01T- oO 0.001 10.100 #1 10 #100 #1 10 us us ms ms ms s $s TIME DELAY output high. The voltage across the capacitor increases exponentially with the time constant rRaC When the voltage across the capacitor equals 2/3 V . the comparator resets the flip-flop, which in turn discharges the capacitor rapidly and drives the output to its low state. ASTABLE OPERATION vt a a OuTPUT Cc . 0.01 LF I 1 2 The circuit can also be connected to trigger itself and free run as a multivibrator. The external capacitor charges through Ra and Re and discharges through Rp only: Thus the duty cycle may be precisely set by the ratio of these two resistors. In this mode of operation, the capacitor charges and dis- charges between 1/3 VV and 2/3 V~. Asin the triggered mode, FREE RUNNING FREQUENCY vs. Ra, Rp AND C 100 10 CAPACITANCE UF So 0.001 0.1 10 100) tk 10k (100k FREE RUNNING FREQUENCY Hz the charge and discharge times. and therefore the frequency are independent of the supply voltage. 146 oa: : 1 The frequency of oscillation is given by: f { Ral oRe