ORDERING INFORMATION

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Maximilian Ray
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The LM555/I is a highly stable controller capable of producing accurate timing pulses. With monostable operation, the time delay is controlled by one external and one capacitor.

8 DIP FEATURES High Current Drive Capability (= 200mA) Adjustable Duty Cycle Temperature Stability of 0.

1 The LM555/I is a highly stable controller capable of producing accurate timing pulses. With monostable operation, the time delay is controlled by one external and one capacitor. With astable operation, the frequency and duty cycle are accurately controlled with two external resistors and one capacitor. 8 DIP FEATURES High Current Drive Capability (= 200mA) Adjustable Duty Cycle Temperature Stability of 0.005%/ C Timing From µsec To Hours Turn Off Time Less Than 2µSec 8 SOP APPLICATIONS Precision Timing Pulse Generation Time Delay Generation Sequential Timing ORDERING INFORMATION Device Package Operating Temperature LM555CN (NE555N) (KA555) 8 DIP LM555CM (KA555D) 8 SOP KA555I 8 DIP KA555ID 8 SOP 0 ~ +70 C -40 ~ +85 C BLOCK DIAGRAM Rev. C 1999 Fairchild Semiconductor Corporation

2 ABSOLUTE MAXIMUM RATINGS (T A = 25 C) Characteristic Symbol alue Unit Supply oltage CC 16 Lead Temperature (soldering 10sec) T LEAD 300 C Power Dissipation P D 600 mw Operating Temperature Range LM555C 0 ~ + 70 C T OPR LM555CI - 40 ~ + 85 C Storage Temperature Range T STG - 65 ~ C ELECTRICAL CHARACTERISTICS (T A = 25 C, CC = 5 ~ 15, unless otherwise specified) Characteristic Symbol Test Conditions Min Typ Max Unit Supply oltage CC Supply Current CC = 5, R L = 3 6 ma 1 (low stable) CC = 15, R L = ma Timing Error (Monostable) 2 Initial Accuracy Drift with Temperature Drift with Supply oltage Timing Error (astable) 2 Intial Accuracy Drift with Temperature Drift with Supply oltage Control oltage Threshold oltage I CC ACCUR t/ T t/ CC ACCUR t/ T t/ CC C TH R A = 1KΩ to 100KΩ C = 0.1µF R A = 1KΩ to 100KΩ C = 0.1µF % ppm/ C %/ % ppm/ C %/ CC = CC = CC = CC = Threshold Current I TH µa Trigger oltage TR CC = Trigger oltage TR CC = Trigger Current I TR TR = µa Reset oltage RST Reset Current I RST ma

3 ELECTRICAL CHARACTERISTICS (T A = 25 C, CC = 5 ~ 15, unless otherwise specified) Notes: Characteristic Low Output oltage High Output oltage Symbol OL OH Test Conditions CC = 15 I SINK = 10mA I SINK = 50mA Min Typ Max Unit 1. Supply current when output is high is typically 1mA less at CC = 5 2. Tested at CC = 5.0 and CC = This will determine maximum value of R A + R B for 15 operation, the max. total R = 20MΩ, and for 5 operation the max. total R = 6.7MΩ CC = 5 I SINK = 5mA CC = 15 I SOURCE = 200mA I SOURCE = 100mA CC = 5 I SOURCE = 100mA Rise Time of Output t R 100 ns Fall Time of Output t F 100 ns Discharge Leakage Current I LKG na APPLICATION CIRCUIT

4 APPLICATION NOTE The application circuit shows astable mode. Pin 6 (threshold) is tied to Pin 2 (trigger) and Pin 4 (reset) is tied to CC (Pin 8). The external capacitor C 1 of Pin 6 and Pin 2 charges through R A, R B and discharges through R B only. In the internal circuit of the LM555 one input of the upper comparator is the 2/3 CC ( R 1 =R 2=R 3, another input if it If it is connected Pin 6. As soon as charging C 1 is higher than 2/3 cc, discharge transistor Q 1 turns on and C 1 discharges to collector of transistor Q 1. Therefore, the flip-flop circuit is reset and output is low. One input of lower comparator is the 1/3 CC, discharge transistor Q 1 turn off and C 1 charges through R A and R B. Therefore, the flip-flop circuit is set and output is high. So to say, when C 1 charges through R A and R 1 output is high and when C 1 discharges through R B output is low. The charge time (output is high) T 1 is (R A+R B) C 1 and the discharge time (output is low) T 2 is (R B C 1). (I CC-1/3 n = 0.693) CC CC-2/3 CC Thus the total period time T is given by T=T 1 +T 2 = (R A +2R B) C 1. Then the frequency of astable mode is given by f = = 1 T 1.44 (R A + 2R B)C 1 The duty cycle is given by T 2 D.C = = T R B R A + 2R B If you make use of the LM556 you can make two astable modes.

5 Astable Operation The LM555 can free run as a mulitivibrator by triggering itself; refer to Fig.2. The output can swing from DD to GND and have 50 duty cycle square wave. Less than 1% frequency deviation can be observed, over a voltage range of 2 to 5. f-1/1.4rc Fig. 1. Astable Operation CC GND 1 8 CC 10KΩ / / / OUTPUT TRIGGER 2 3 LM555C 7 6 DISCHARGE THRESHOLD ALTERNATE OUTPUT CC RESET 4 5 C Monostable Operation / / / The LM555 can be used as a one-short, i.e. monostable multivibrator. Initially, because the inside discharge transistor is on state, external timing capacitor is held to GND potential. Upon application of a negative TRIGGER pulse pin 2, the intern discharge transistor is off state and the voltage across the capacitor increases with time constant T = R AC and OUTPUT goes to high state. When the voltage across the capacitor equals 2/3 CC the inner comparator is reset by THRESHOLD input and the discharge transistor goes to on state, which in turn discharges the capacitor rapidly and drives the OUTPUT to its low state. Fig. 2. Monostable Operation CC ( 18) 1 8 R A / / / TRIGGER OUTPUT 2 3 LM555C 7 6 DISCHARGE THRESHOLD RESET 4 5 CONTROL OLTAGE OPTION CAPACITOR C / / / / / /

6 TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. ACEx CoolFET CROSSOLT E 2 CMOS FACT FACT Quiet Series FAST FASTr GTO HiSeC ISOPLANAR MICROWIRE POP PowerTrench QFET QS Quiet Series SuperSOT -3 SuperSOT -6 SuperSOT -8 TinyLogic UHC CX DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant into support device or system whose failure to perform can the body, or (b) support or sustain life, or (c) whose be reasonably expected to cause the failure of the life failure to perform when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Preliminary First Production This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only.

KA239, LM339/A (KA339/A), LM2901 (KA2901), KA3302

KA239, LM339/A (KA339/A), LM2901 (KA2901), KA3302 QUAD DIFFERENTIAL COMPARATOR The LM/KA239 series consists of four independent voltage comparators designed to operate from single power supply over a wide voltage range. FEATURES Single or dual supply