NE556 SA556 - SE556 General-purpose dual bipolar timers Features Low turn-off time Maximum operating frequency greater than 500 kHz Timing from microseconds to hours Operates in both astable and monostable modes Output can source or sink up to 200 mA Adjustable duty cycle TTL compatible Temperature stability of 0.005% per C N DIP14 (Plastic package) D SO14 (Plastic micropackage) Description The NE556, SA556 and SE556 dual monolithic timing circuits are highly stable controllers capable of producing accurate time delays or oscillation. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor. Pin connections (top view) The circuits may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200 mA. January 2009 Rev 2 Discharge 1 14 VCC Threshold 2 13 Discharge Control Voltage 3 12 Threshold Reset 4 11 Control Voltage Output 5 10 Reset Trigger 6 9 Output GND 7 8 Trigger 1/16 www.st.com 16 Schematic diagrams 1 NE556 - SA556 - SE556 Schematic diagrams Figure 1. Block diagram VCC+ 5kW COMP THRESHOLD CONTROL VOLTAGE DISCHARGE R FLIP-FLOP Q 5kW COMP TRIGGER OUT 1/2 NE556 S INHIBIT/ RESET 5kW S RESET Figure 2. Schematic diagram CONTROL VOLTAGE OUTPUT THRESHOLD COMPARATOR 5 VCC R2 830W R1 4.7kW R3 4.7kW R4 R8 1kW 5kW R12 6.8kW Q21 Q5 Q6 Q7 Q8 Q19 Q9 Q20 Q22 R13 3.9kW R11 5kW THRESHOLD Q1 Q2 Q3 Q11 Q12 TRIGGER 2 Q23 R9 5kW D2 RESET 4 Q24 Q17 Q14 GND R5 10kW R6 100kW R7 100kW R10 5kW 1 TRIGGER COMPARATOR 2/16 Q18 Q15 7 3 R14 220W Q13 Q10 Q16 DISCHARGE D1 R17 4.7kW Q4 FLIP FLOP R16 100W R15 4.7kW NE556 - SA556 - SE556 2 Absolute maximum ratings and operating conditions Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings Symbol Parameter VCC Supply voltage IOUT Output current (sink and source) Value Unit 18 V 225 mA (1) Rthja Thermal resistance junction to ambient DIP14 SO-14 80 105 C/W Rthjc Thermal resistance junction to case (1) DIP14 SO-14 33 31 C/W Human body model (HBM)(2) (3) ESD Machine model (MM) Charged device model TLEAD Tj (CDM)(4) 150 V 1500 Latch-up immunity 200 mA Lead temperature (soldering 10 seconds) 260 C Junction temperature 150 C -65 to 150 C Storage temperature range Tstg 1000 1. Short-circuits can cause excessive heating. These values are typical and valid only for a single layer PCB. 2. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5k resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating. 3. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 ). This is done for all couples of connected pin combinations while the other pins are floating. 4. Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins. Table 2. Operating conditions Symbol Value Unit 4.5 to 16 4.5 to 16 4.5 to 18 V Maximum input voltage VCC V IOUT Output current (sink and source) 200 mA Toper Operating free air temperature range NE556 SA556 SE556 0 to 70 -40 to 105 -55 to 125 C VCC Vth, Vtrig, Vcl, Vreset Parameter Supply voltage NE556 SA556 SE556 3/16 Electrical characteristics NE556 - SA556 - SE556 3 Electrical characteristics Table 3. Tamb = +25 C, VCC = +5 V to +15 V (unless otherwise specified) SE556 Symbol Unit Min. ICC NE556 - SA556 Parameter Typ. Max. Supply current (RL ) (2 timers) Low state VCC = +5V VCC = +15V High State VCC = +5V 6 20 4 Timing error (monostable) (RA = 2k to 100k, C = 0.1F) Initial accuracy (1) Drift with temperature Drift with supply voltage 0.5 30 0.05 Timing error (astable) (RA, RB = 1k to 100k, C = 0.1F, VCC= +15V) Initial accuracy (1) Drift with temperature Drift with supply voltage 1.5 90 0.15 Min. Typ. Max. 10 24 6 20 4 12 30 mA 2 100 0.2 1 50 0.1 3 % ppm/C %/V 0.5 2.25 150 0.3 % ppm/C %/V VCL Control voltage level VCC = +15V VCC = +5V 9.6 2.9 10 3.33 10.4 3.8 9 2.6 10 3.33 11 4 V Vth Threshold voltage VCC = +15V VCC = +5V 9.4 2.7 10 3.33 10.6 4 8.8 2.4 10 3.33 11.2 4.2 V Ith Threshold current (2) 0.1 0.25 0.1 0.25 A 5 1.67 5.2 1.9 5 1.67 5.6 2.2 V 0.5 0.9 0.5 2.0 A 0.7 1 0.7 1 V mA Vtrig Trigger voltage VCC = +15V VCC = +5V Itrig Trigger current (Vtrig = 0V) (3) 4.8 1.45 Vreset Reset voltage Ireset Reset current Vreset = +0.4V Vreset = 0V 0.1 0.4 0.4 1 0.1 0.4 0.4 1.5 VOL Low level output voltage VCC = +15V IO(sink) = 10mA IO(sink) = 50mA IO(sink) = 100mA IO(sink) = 200mA IO(sink) = 8mA VCC = +5V IO(sink) = 5mA 0.1 0.4 2 2.5 0.1 0.05 0.15 0.5 2.2 0.1 0.4 2 2.5 0.3 0.25 0.25 0.75 2.5 VOH 4/16 High level output voltage IO(sink) = 200mA VCC = +15V IO(sink) = 100mA IO(sink) = 100mA VCC = +5V 0.4 4.5 1.1 13 3 12.5 13.3 3.3 0.4 0.25 0.2 12.75 2.75 12.5 13.3 3.3 V 0.4 0.35 V NE556 - SA556 - SE556 Table 3. Electrical characteristics Tamb = +25 C, VCC = +5 V to +15 V (unless otherwise specified) (continued) SE556 Symbol NE556 - SA556 Parameter Unit Min. Typ. Max. 20 Min. Typ. Max. 100 20 100 nA mV Idis(off) Discharge pin leakage current (output high) (Vdis = 10V) Vdis(sat) Discharge pin saturation voltage (output low) (4) VCC = +15V, Idis = 15mA VCC = +5V, Idis = 4.5mA 180 80 480 200 180 80 480 200 Output rise time Output fall time 100 100 200 200 100 100 300 300 Turn-off time (5) (Vreset = VCC) 0.5 tr tf toff 0.5 ns s 1. Tested at VCC = +5 V and VCC = +15 V 2. This will determine the maximum value of RA + RB for +15V operation the max total is R = 20 M and for +5 V operation the max total R = 3.5 M 3. Specified with trigger input high 4. No protection against excessive pin 7 current is necessary, providing the package dissipation rating will not be exceeded 5. Time measured from a positive going input pulse from 0 to 0.8 x VCC into the threshold to the drop from high to low of the output trigger is tied to threshold. 5/16 Electrical characteristics NE556 - SA556 - SE556 Figure 3. Minimum pulse width required for triggering Figure 4. Supply current versus supply voltage Figure 5. Delay time versus temperature Figure 6. Low output voltage versus output sink current Figure 7. Low output voltage versus output sink current Figure 8. Low output voltage versus output sink current 6/16 NE556 - SA556 - SE556 Figure 9. High output voltage drop versus output Electrical characteristics Figure 10. Delay time versus supply voltage Figure 11. Propagation delay versus voltage level of trigger value 7/16 Application information NE556 - SA556 - SE556 4 Application information 4.1 Typical application Figure 12. 50% duty cycle oscillator VCC 4 6 (8) 14 (10) Rs (13) 1 1/2 NE556 SE556 Output RA 51kW 22kW (12) 2 (11) 3 5 (9) 0.01nF C 7 t1 = 0.693 RA.C t2 RB - 2RA t2 = [(RARB)/(RA+RB)]CLn --------------------------2RB - RA t1 1 f = ----------------- RB < --- RA ti t1 + t2 2 t1 Figure 13. Pulse width modulator VCC RA 4 Trigger 6 (8) 14 (10) (13) 1 1/2 NE556 SE556 Output (12) 2 (11) 3 5 (9) C 7 MODULATION INPUT 8/16 NE556 - SA556 - SE556 Application information Figure 14. Tone burst generator Reset Rt Vcc 4 5 10 Output Reset Trigger Trigger 6 Discharge 1 13 Ground 12 Threshold 8 Trigger Output 3 Threshold 11 Control 9 Ground 0.01mF t RB 1/2 NE556 SE556 Control T = 1.1 R RA Discharge 1/2 NE556 SE556 2 C1 +15V 14 14 .C1 f= 0.01mF 1.44 C2 Ground R A + 2R B ) C For a tone burst generator the first timer is used as a monostable and determines the tone duration when triggered by a positive pulse at pin 6. The second timer is enabled by the high output or the monostable. It is connected as an astable and determines the frequency of the tone. Figure 15. Monostable operation VCC RL RA 4 (10) 6 (8) Trigger 14 (13) 1 1/2 NE556 SE556 (12) Output 5 (9) RL 7 (11) 2 3 10nF C T = 1.1 R A .C 9/16 Application information NE556 - SA556 - SE556 Figure 16. Astable operation VCC RL RA 4 14 (10) 5 (9) Output (13) 1 1/2 NE556 SE556 RB (12) RL 7 (11) (8) 3 6 2 C 0.01nF Operating frequency f= 1.44 R A + 2R B ) C t1 = 0.693 (RA + RB) C output high t2 = 0.693 RBC output low t2 t1 10/16 NE556 - SA556 - SE556 5 Package information Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. 11/16 Package information 5.1 NE556 - SA556 - SE556 DIP14 package information Figure 17. DIP14 package mechanical drawing Table 4. DIP14 package mechanical data Dimensions Millimeters Inches Ref. Min. Typ. A Typ. Max. 0.21 A1 0.38 A2 2.92 3.30 4.95 0.11 0.13 0.19 b 0.36 0.46 0.56 0.014 0.018 0.022 b2 1.14 1.52 1.78 0.04 0.06 0.07 c 0.20 0.25 0.36 0.007 0.009 0.01 D 18.67 19.05 19.69 0.73 0.75 0.77 E 7.62 7.87 8.26 0.30 0.31 0.32 E1 6.10 6.35 7.11 0.24 0.25 0.28 0.015 e 2.54 0.10 e1 15.24 0.60 eA 7.62 0.30 L 12/16 Min. 5.33 eB Note: Max. 10.92 2.92 3.30 3.81 0.43 0.11 0.13 0.15 D and E1 dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.25 mm. NE556 - SA556 - SE556 5.2 Package information SO-14 package information Figure 18. SO-14 package mechanical drawing Table 5. SO-14 package mechanical data Dimensions Millimeters Inches Ref. Min. Typ. Max. Min. Max. A 1.35 1.75 0.05 0.068 A1 0.10 0.25 0.004 0.009 A2 1.10 1.65 0.04 0.06 B 0.33 0.51 0.01 0.02 C 0.19 0.25 0.007 0.009 D 8.55 8.75 0.33 0.34 E 3.80 4.0 0.15 0.15 e 1.27 0.05 H 5.80 6.20 0.22 0.24 h 0.25 0.50 0.009 0.02 L 0.40 1.27 0.015 0.05 k ddd Note: Typ. 8 (max.) 0.10 0.004 D and F dimensions do not include mold flash or protrusions. Mold flash or protrusions must not exceed 0.15 mm. 13/16 Ordering information 6 NE556 - SA556 - SE556 Ordering information Table 6. Order codes Part number Temperature range NE556N Package Packing Marking DIP14 Tube NE556N SO-14 Tube or tape & reel NE556 DIP14 Tube SA556N SO-14 Tube or tape & reel SA556 DIP14 Tube SE556N SO-14 Tube or tape & reel SE556 0C, +70C NE556D/DT SA556N -40C, +105C SA556D/DT SE556N -55C, + 125C SE556D/DT 14/16 NE556 - SA556 - SE556 7 Revision history Revision history Table 7. Document revision history Date Revision 01-Jun-2003 1 Initial release. 2 Document reformatted. Added IOUT value in Table 1: Absolute maximum ratings and Table 2: Operating conditions. Added ESD tolerance, latch-up tolerance, Rthja and Rthjcin Table 1: Absolute maximum ratings. Updated Section 5.1: DIP14 package information and Section 5.2: SO-14 package information. 27-Jan-2009 Changes 15/16 NE556 - SA556 - SE556 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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