NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 FEATURES • • Timing From Microseconds to Hours Astable or Monostable Operation • • Adjustable Duty Cycle TTL-Compatible Output Can Sink or Source up to 200 mA DESCRIPTION/ORDERING INFORMATION These devices are precision timing circuits capable of producing accurate time delays or oscillation.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 ORDERING INFORMATION TA VTHRES MAX VCC = 15 V PACKAGE (1) PDIP – P 11.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 FUNCTIONAL BLOCK DIAGRAM VCC 8 6 THRES 2 TRIG CONT 5 ÎÎ ÎÎ ÎÎ ÎÎ ÎÎ ÎÎ ÎÎ Î Î Î RESET 4 R1 R S 1 Î Î Î Î Î Î 3 OUT 7 DISCH 1 GND Pin numbers shown are for the D, JG, P, PS, and PW packages. NOTE A: RESET can override TRIG, which can override THRES.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 Electrical Characteristics VCC = 5 V to 15 V, TA = 25°C (unless otherwise noted) PARAMETER THRES voltage level TEST CONDITIONS MIN TYP MAX MIN TYP MAX 9.4 10 10.6 8.8 10 11.2 VCC = 5 V 2.7 3.3 4 2.4 3.3 4.2 30 250 5 5.2 1.67 1.9 4.8 VCC = 15 V TA = –55°C to 125°C TRIG voltage level RESET current 3 1.45 VCC = 5 V RESET voltage level 5.6 1.1 1.67 2.2 0.9 0.7 1 0.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 Operating Characteristics VCC = 5 V to 15 V, TA = 25°C (unless otherwise noted) PARAMETER MIN Initial error of timing interval (2) Each timer, monostable (3) Temperature coefficient of timing interval Each timer, monostable (3) TYP MAX 0.5 1.5 (4) 1.5 TA = MIN to MAX astable (5) 30 TA = 25°C 0.05 MIN UNIT TYP MAX 1 3 2.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 TYPICAL CHARACTERISTICS Data for temperatures below 0°C and above 70°C are applicable for SE555 circuits only. ÏÏÏÏ ÏÏÏÏ ÏÏÏÏ ÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏ ÏÏÏÏ ÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏÏÏÏÏÏ ÏÏÏÏ ÏÏÏÏ ÏÏÏÏ ÏÏÏÏ ÏÏÏÏ ÏÏÏÏ ÏÏÏÏ LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT 4 2 1 0.7 0.4 10 7 VCC = 5 V ÏÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏÏ TA = −55°C TA = 25°C TA = 125°C 0.2 0.1 0.07 0.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 TYPICAL CHARACTERISTICS (continued) Data for temperatures below 0°C and above 70°C are applicable for SE555 circuits only.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 APPLICATION INFORMATION Monostable Operation For monostable operation, any of these timers can be connected as shown in Figure 9. If the output is low, application of a negative-going pulse to the trigger (TRIG) sets the flip-flop (Q goes low), drives the output high, and turns off Q1.
NA555, NE555, SA555, SE555 PRECISION TIMERS ÏÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏÏ www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 APPLICATION INFORMATION (continued) 10 RA = 9.1 kΩ CL = 0.01 µF RL = 1 kΩ See Figure 9 RA = 10 MΩ tw − Output Pulse Duration − s 1 Voltage − 2 V/div Input Voltage ÏÏÏÏÏÏ ÏÏÏÏÏÏ ÏÏÏÏÏÏ ÏÏÏÏÏÏ Output Voltage RA = 1 MΩ 10−1 10−2 10−3 RA = 100 kΩ RA = 10 kΩ 10−4 RA = 1 kΩ 10−5 0.001 Capacitor Voltage 0.01 0.1 1 10 100 C − Capacitance − µF Time − 0.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 APPLICATION INFORMATION (continued) Figure 13 shows typical waveforms generated during astable operation. The output high-level duration tH and low-level duration tL can be calculated as follows: + 0.693 (R ) R C A B) t + 0.693 (R C L B) 100 k H RA + 2 RB = 1 kΩ RA + 2 RB = 10 kΩ Other useful relationships are shown below. period + t ) t + 0.693 (R ) 2R ) C H L A B 1.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 APPLICATION INFORMATION (continued) Frequency Divider By adjusting the length of the timing cycle, the basic circuit of Figure 9 can be made to operate as a frequency divider. Figure 17 shows a divide-by-three circuit that makes use of the fact that retriggering cannot occur during the timing cycle. ÏÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏÏ ÏÏÏÏÏ Voltage − 2 V/div VCC = 5 V RA = 1250 Ω C = 0.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 APPLICATION INFORMATION (continued) Pulse-Width Modulation The operation of the timer can be modified by modulating the internal threshold and trigger voltages, which is accomplished by applying an external voltage (or current) to CONT. Figure 18 shows a circuit for pulse-width modulation. A continuous input pulse train triggers the monostable circuit, and a control signal modulates the threshold voltage.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 APPLICATION INFORMATION (continued) Pulse-Position Modulation As shown in Figure 20, any of these timers can be used as a pulse-position modulator. This application modulates the threshold voltage and, thereby, the time delay, of a free-running oscillator. Figure 21 shows a triangular-wave modulation signal for such a circuit; however, any wave shape could be used.
NA555, NE555, SA555, SE555 PRECISION TIMERS www.ti.com SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 APPLICATION INFORMATION (continued) Sequential Timer Many applications, such as computers, require signals for initializing conditions during start-up. Other applications, such as test equipment, require activation of test signals in sequence. These timing circuits can be connected to provide such sequential control.
PACKAGE OPTION ADDENDUM www.ti.
PACKAGE OPTION ADDENDUM www.ti.
MECHANICAL DATA MCER001A – JANUARY 1995 – REVISED JANUARY 1997 JG (R-GDIP-T8) CERAMIC DUAL-IN-LINE 0.400 (10,16) 0.355 (9,00) 8 5 0.280 (7,11) 0.245 (6,22) 1 0.063 (1,60) 0.015 (0,38) 4 0.065 (1,65) 0.045 (1,14) 0.310 (7,87) 0.290 (7,37) 0.020 (0,51) MIN 0.200 (5,08) MAX Seating Plane 0.130 (3,30) MIN 0.023 (0,58) 0.015 (0,38) 0°–15° 0.100 (2,54) 0.014 (0,36) 0.008 (0,20) 4040107/C 08/96 NOTES: A. B. C. D. E. All linear dimensions are in inches (millimeters).
MECHANICAL DATA MLCC006B – OCTOBER 1996 FK (S-CQCC-N**) LEADLESS CERAMIC CHIP CARRIER 28 TERMINAL SHOWN 18 17 16 15 14 13 NO. OF TERMINALS ** 12 19 11 20 10 A B MIN MAX MIN MAX 20 0.342 (8,69) 0.358 (9,09) 0.307 (7,80) 0.358 (9,09) 28 0.442 (11,23) 0.458 (11,63) 0.406 (10,31) 0.458 (11,63) 21 9 22 8 44 0.640 (16,26) 0.660 (16,76) 0.495 (12,58) 0.560 (14,22) 23 7 52 0.739 (18,78) 0.761 (19,32) 0.495 (12,58) 0.560 (14,22) 24 6 68 0.938 (23,83) 0.
MECHANICAL DATA MPDI001A – JANUARY 1995 – REVISED JUNE 1999 P (R-PDIP-T8) PLASTIC DUAL-IN-LINE 0.400 (10,60) 0.355 (9,02) 8 5 0.260 (6,60) 0.240 (6,10) 1 4 0.070 (1,78) MAX 0.325 (8,26) 0.300 (7,62) 0.020 (0,51) MIN 0.015 (0,38) Gage Plane 0.200 (5,08) MAX Seating Plane 0.010 (0,25) NOM 0.125 (3,18) MIN 0.100 (2,54) 0.021 (0,53) 0.015 (0,38) 0.430 (10,92) MAX 0.010 (0,25) M 4040082/D 05/98 NOTES: A. All linear dimensions are in inches (millimeters). B.
MECHANICAL DATA MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999 PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 14 PINS SHOWN 0,30 0,19 0,65 14 0,10 M 8 0,15 NOM 4,50 4,30 6,60 6,20 Gage Plane 0,25 1 7 0°– 8° A 0,75 0,50 Seating Plane 0,15 0,05 1,20 MAX PINS ** 0,10 8 14 16 20 24 28 A MAX 3,10 5,10 5,10 6,60 7,90 9,80 A MIN 2,90 4,90 4,90 6,40 7,70 9,60 DIM 4040064/F 01/97 NOTES: A. B. C. D. All linear dimensions are in millimeters.
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