LM_LM555 - www.fairchildsemi.com LM555 Single Timer...

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©2011 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.4 Features • High Current Drive Capability (200mA) • Adjustable Duty Cycle • Temperature Stability of 0.005%/ ° C • Timing From μ Sec to Hours • Turn off Time Less Than 2 μ Sec Applications • Precision Timing • Pulse Generation • Time Delay Generation • Sequential Timing Description The LM555 is a highly stable controller capable of produc- ing accurate timing pulses. With a monostable operation, the time delay is controlled by one external resistor and one capacitor. With an astable operation, the frequency and duty cycle are accurately controlled by two external resistors and one capacitor. 8-DIP 8-SOIC 1 1 Internal Block Diagram F/F OutPut Stage 1 7 5 2 3 4 6 8 RR R Comp. Comp. Discharging Tr. Vref Vcc Discharge Threshold Control Voltage GND Trigger Output Reset LM555 Single Timer
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LM555 2 Absolute Maximum Ratings (T A = 25 ° C) Parameter Symbol Value Unit Supply Voltage V CC 16 V Lead Temperature (Soldering 10sec) TLEAD 300 ° C Power Dissipation P D 600 mW Operating Temperature Range (LM555) T OPR 0 ~ +70 ° C Storage Temperature Range TSTG -65 ~ +150 ° C
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LM555 3 Electrical Characteristics (TA = 25 ° C, VCC = 5 ~ 15V, unless otherwise specified) Notes: 1. When the output is high, the supply current is typically 1mA less than at VCC = 5V. 2. Tested at VCC = 5.0V and VCC = 15V. 3. This will determine the maximum value of RA + RB for 15V operation, the max. total R = 20M Ω , and for 5V operation, the max. total R = 6.7M Ω. 4. These parameters, although guaranteed, are not 100% tested in production. Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage VCC -4 . 5 - 1 6 V Supply Current (Low Stable) (Note1) ICC V CC = 5V, R L = -36m A V CC = 15V, R L = -7 . 5 1 5m A Timing Error (Monostable) Initial Accuracy (Note2) Drift with Temperature (Note4) Drift with Supply Voltage (Note4) ACCUR Δ t/ Δ T Δ t/ Δ VCC RA = 1k Ω to100k Ω C = 0.1 μ F -1 . 0 50 0.1 3.0 0.5 % ppm/ ° C %/V Timing Error (Astable) Intial Accuracy (Note2) Drift with Temperature (Note4) Drift with Supply Voltage (Note4) ACCUR Δ t/ Δ T Δ t/ Δ VCC RA = 1k Ω to 100k Ω C = 0.1 μ F - 2.25 150 0.3 -% ppm/ ° C %/V Control Voltage VC V CC = 15V 9.0 10.0 11.0 V V CC = 5 V 2 . 63 . 3 34 . 0 V Threshold Voltage V TH VCC = 15V - 10.0 - V V CC = 5V - 3.33 - V Threshold Current (Note3) I TH - - 0.1 0.25 μ A Trigger Voltage V TR VCC = 5V 1.1 1.67 2.2 V V CC = 15V 4.5 5 5.6 V Trigger Current I TR V TR = 0V 0.01 2.0 μ A Reset Voltage VRST - 0.4 0.7 1.0 V Reset Current I RST - 0.1 0.4 mA Low Output Voltage V OL V CC = 15V I SINK = 10mA I SINK = 50mA -0 . 0 6 0.3 0.25 0.75 V V VCC = 5V ISINK = 5mA . 0 5 0 . 3 5 V High Output Voltage VOH V CC = 15V I SOURCE = 200mA I SOURCE = 100mA 12.75 12.5 13.3 -V V V CC = 5V I SOURCE = 100mA 2.75 3.3 - V Rise Time of Output (Note4) tR - 0 0- n s Fall Time of Output (Note4) t F - 0 n s Discharge Leakage Current I LKG - -2 0 1 0 0n A
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LM555 4 Application Information Table 1 below is the basic operating table of 555 timer: When the low signal input is applied to the reset terminal, the timer output remains low regardless of the threshold voltage or the trigger voltage. Only when the high signal is applied to the reset terminal, the timer's output changes according to threshold voltage and trigger voltage.
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This note was uploaded on 08/05/2011 for the course ECE 209 taught by Professor Staff during the Fall '08 term at Ohio State.

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LM_LM555 - www.fairchildsemi.com LM555 Single Timer...

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