RoHS Compliant Product

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Joleen Barnett
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1 RoHS Compliant Product Description The SMSNE555 is a highly stable timer IC that can be operated in astable mode and monostable mode. For monostable mode: time delay is controlled by one external and one capacitor. For stable mode: frequency and duty cycle are accurately controlled with two external resistors and one capacitor. Features Package Dimensions High current driver capability (=200mA) Adjustable duty cycle timing form sec to hours turn off time less than 2 sec Applications Precision timing Pulse generation Time delay generation Block Diagram and Simplified Application & Pin Configuration Ref. mm mm Ref. Min. Max. Min. Max. A L A L BSC. A b D c E e 0.65 BSC. HE Jun-2006 Rev. A Page 1 of 5

2 Absolute Maximum Ratings (Ta = 25 C) Parameter Symbol alue Units Supply oltage CC 16 Differential Input oltage I O 200 ma Input oltage T lead 300 C Power Dissipation P D 440 mw Opearting, Storage Temperature T OPR, T STG 0~70, -65~150 C Electrical Characteristics (Ta = 25 C, CC = 5 ~ 15) Parameter Symbol Test Conditions Min Typ Max Units Supply oltage CC Supply Current (Note 1) I CC CC = 5, RL = ma CC = 15, RL = ma Timing Error (monostable) Initial Accurary (Note 1) A CCUR R A = 1k ~ 100kΩ % Drift with Temperature Δt/ΔT C = 0.1 μf ppm/ C Drift with Supply oltage Δt/Δ CC %/ Timing Error (astable) Initial Accurary (Note 1) A CCUR R A = 1k ~ 100kΩ % Drift with Temperature Δt/ΔT C = 0.1 μf ppm/ C Drift with Supply oltage Δt/Δ CC %/ Control oltage Threshold oltage C TH CC = CC = CC = CC = Threshold Current (Note 3) I TH μa Trigger oltage tr CC = CC = Trigger Current I tr tr = μa Reset oltage rst Reset Current I rst μa Low Output oltage High Output oltage OL OH CC = 15, I sink = 10mA CC = 15, I sink = 50mA CC = 5, I sink = 5mA CC = 15, I sink = 200mA CC = 15, I sink = 100mA CC = 5, I sink = 100mA Reset Time of Output t R nsec Fall Time of Output t F nsec Discharge leakage Current I LKG na Note 1: Supply current when output is high typically 1 ma less at CC = 5 Note 2: Tested at CC = 5 and CC = 15. Note 3: This will determine the maximum value or RA+RB for 15 operation, the maximum total is R=20MΩ, and for 5 operation the maximum total is R=6.7MΩ. 01-Jun-2006 Rev. A Page 2 of 5

3 Characteristics Curve CC = Jun-2006 Rev. A Page 3of 5

4 01-Jun-2006 Rev. A Page 4 of 5

5 Application Circuit FLIP-FLOP SPNE555 Application Notes The application circuit shows astable mode configuration. Pin 6 (Threshold) is tied to Pin 2 (Trigger) and Pin 4 (Reset) is tied to CC (Pin 8). The external capacitor C1 of Pin 6 and Pin 2 charges through RA, RB and discharge through RB only. In the internal circuit of GSCNE555, one input of the upper comparator is at voltage of 2/3CC (R1=R2=R3), another input is connected to Pin 6. As soon as C1 is charging to higher than 2/3CC, transistor Q1 is turned ON and discharge C1 to collector voltage of transistor Q1. Therefore, the flip-flop circuit is reset and output is low. One input of lower comparator is at voltage of 1/3CC, discharge transistor Q1 turn off and C1 charges through RA and RB. Therefore, flip-flop circuit is set output high. That is, when C1 charges through RA and RB, output is high and when C1 discharge through RB, output is low. The charge time (output is high) t1 is (RA+RB) C1 and the discharge time (output is low) T2 is 0.693RB*C1. In 1 cc - cc 3 cc cc =0.693 Thus the total period time T is given by T1=0.693*(RA+RB)*C1 T2=0.693*RB*C1 T=T1+T2=0.693(RA+2RB)*C1 Then the frequency of astable mode is given by 1 f = = T 1.44 (RA+2RB)*C1 The duty cycle is given by T2 D.C. = = T RB RA+2RB 01-Jun-2006 Rev. A Page 5of 5

UNISONIC TECHNOLOGIES CO., LTD

SINGLE TIMER UNISONIC TECHNOLOGIES CO., LTD DESCRIPTION The UTC NE555 is a highly stable timer integrated circuit. It can be operated in both Astable and Monostable mode. With monostable operation, the