NE555

NE555 Description These devices are monolithic timing circuits capable of producing accurate time delays or oscillation. Inthe time delay mode o f operation, the timed interval is controll ed by a single external resistor and capacit or netw ork. In the astable mode of operati on, the frequency and duty cy cle may be independently controlled w i th two external resistors and a si ngle external capacitor. Features • • • • • Timing from Microseconds to Hours Astable or Monostable Operation Adjustable Duty Cy cle TTL - Compatible Output Can Sink or Source Up to 200 mA Temperature Stability of 0.005% per o C DIP-8 SOP-8 • Direct Replacement for Signetics NE555 Timer P a ck age Applications • • • • • • • Pin Configuration TOP VIEW Precision timing Pulse generation Sequential timing Time delay generation Pulse w idth modulation Pulse position modulation Missing pulse detector Internal Block Digram RESET can override TRI GGER, which can override THRESHOLD BEIJING ESTEK ELECTRONICS CO.,LTD 1 NE555 Absolute Maximum Ratings (TA=25° unless otherwise specified) C, Parameter Supply Voltage, VCC Input Voltage (control, reset, threshold and trigger) Output Current, I0 Operating Free-Air Temperature, TA Storage Temperature Range, TSTG Min 4.5 Max 16 VCC ± 200 70 +150 Units V mA ° C -65 Electrical characteristics (TA=25° VCC=+5V to +15V, unless otherwise specified) C, Parameter Operating Supply Voltage Range Threshold Voltage Level Threshold Current (Note 1) Trigger Voltage Level Trigger Current Reset Voltage Level Reset Current Discharge Leakage Current Control Voltage Level Low-level Output Voltage Test condition s (Note 2) VCC=15V VCC=5V (see Note 1) VCC=15V VCC=5V Trigger at 0V Reset at VCC Reset at 0V VCC=15V VCC=5V VCC=15V 9 2.6 IOL=10mA IOL=50mA IOL=100mA IOL=200mA IOL=5mA IOL=8mA IOL=-100mA IOL=-200mA IOL=-100mA VCC=15V VCC=5V VCC=15V VCC=5V Min 4.5 8.8 2.4 4.5 1.1 0.3 Typ 10 3.3 30 5 1.67 0.5 0.7 0.1 -0.4 20 10 3.3 0.1 0.4 2 2.5 0.25 0.3 13.3 12.5 3.3 10 3 9 2 1 5 Max 16 11.2 4.2 250 5.6 2.2 2 1 0.4 -1.5 100 11 4 0.25 0.75 2.5 0.35 0.4 Units V V nA V µA V mA nA V VCC=5V High-level Output Voltage VCC=15V VCC=5V Output Low, No Load Output High, No Load TA=25° C 12.75 2.75 Supply Current Initial Error of Timing Interval (Note 3) Temperature Coefficient TA=MIN to MAX 50 150 ppm /° C of Timing Interval 150 500 TA=25° C Supply Voltage Sensitivit y of 0.1 0.5 %/V Timing Interval 0.3 1 CL=15pF, TA=25° C Output Pulse Rise Time 100 300 ns Output Pulse Fall Time 100 300 Note 1: This parameter influences the maximum value of the timing resistors RA and RB in the circuit on Fig 1. For example, when VCC=5V, the ma ximum value is R=R A+RB=3.4 M Ω, and VCC=15V, the maximum value is 10 M Ω. Note 2: For conditions sho wn as MIN or MAX, use the appropriate value specified under recommended operating conditions. Note 3: Timing interval error is defined as the difference between the measured value and the average value of a random sample from each process run. Note 4: Values specified are for a device in a monostable circuit similar to Fig. 2, with component values as follow: RA=2KΩ to 100 KΩ, C=0.1µF. Note 5: Values specified are for a device in an astable circuit similar to Fig. 1, with component values as follow: RA, RB=1KΩ to 100 KΩ, C=0.1µF. monostable (Note 4) astable (Note 5) monostable astable monostable astable 15 6 13 5 3 13 mA % BEIJING ESTEK ELECTRONICS CO.,LTD 2 NE555 Function Table Reset Low High High High Trigger Voltage * Irrelevant < 1/3 VCC > 1/3 VCC > 1/3 VCC Threshold Voltage * Irrelevant High > 2/3 VCC < 2/3 VCC Output Low High Low Discharge Switch On Off On As previously established * Voltage levels sho wn are nominal Typical Applications Circuit Figure 1 Circuit for astable operation Figure 2. Circuit for monostable operation be evaluated for indiv idual NOTE A: Bypassing the control voltage input to ground with a capacitor may improve operation. This should applications. Ordering Information O R DER I NG NU M B E R NE555 P A C K AG E DIP - 8 / SOP - 8 M AR K I NG NE555 Address : Postalcode:100039 Tel: 86-010-58895780 / 81 / 82 / 83 / 84 Http://www.estek.com.cn Email:sales@estek.com.cn 6A06--6A07 Rm 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing Fax : 010-58895793 REV No:01-060823 BEIJING ESTEK ELECTRONICS CO.,LTD 3