NE556 SA556 - SE556 GENERAL PURPOSE DUAL BIPOLAR TIMERS .. .. . .. . LOW TURN OFF TIME MAXIMUM OPERATING FREQUENCY GREATER THAN 500kHz TIMING FROM MICROSECONDS TO HOURS OPERATES IN BOTH ASTABLE AND MONOSTABLE MODES HIGH OUTPUT CURRENT CAN SOURCE OR SINK 200mA ADJUSTABLE DUTY CYCLE TTL COMPATIBLE TEMPERATURE STABILITY OF 0.005% PER oC DESCRIPTION The NE556 dual monolithic timing circuit is a highly stable controller capable of producing accurate time delays or oscillation. In the time delay mode of operation, the time is precisely controlled by oneexternal resistor and capacitor. For a stable operation as an oscillator, the freerunningfrequencyand theduty cycle are both accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200mA. N DIP14 (Plastic Package) D SO14 (Plastic Micropackage) ORDER CODES Part Number Temperature Range o o 0 C, 70 C NE556 Pakcage N D • • o o • • o o • • SA556 –40 C, 105 C SE556 –55 C, 125 C PIN CONNECTIONS (top view) July 1998 Discharge 1 14 VCC Thres hold 2 13 Discharge Control Voltage 3 12 Thres hold Re s et 4 11 Control Voltage Output 5 10 Re s et Trigger 6 9 Output GND 7 8 Trigge r 1/9 NE556/SA556/SE556 BLOCK DIAGRAM VC C+ 5 kΩ COMP DISCHARGE THRES HOLD CONTROL VOLTAGE R FLIP-FLOP 5 kΩ Q COMP OUT 1/2 NE556 TRIGGER S INHIBIT/ RESET 5 kΩ S RESET SCHEMATIC DIAGRAM CONTROL VOLTAGE OUTPUT THRESHOLD COMPARATOR 5 VCC R2 8 30Ω R1 4.7kΩ R4 R8 1kΩ 5 kΩ R3 4 .7kΩ R12 6.8kΩ Q21 Q5 Q6 Q7 Q8 Q19 Q9 Q22 Q2 0 Ρ13 3.9 kΩ R1 1 5kΩ THRESHOLD Q1 Q2 Q3 2 Q23 R9 5 kΩ Q11 Q12 TR IGGER D2 RES ET 4 3 R14 220 Ω Q24 Q1 3 Q10 Q16 DISCHARGE D1 R17 4.7kΩ Q4 Q18 R16 100 Ω R15 4.7kΩ Q1 5 7 Q17 Q14 R5 1 0kΩ R6 1 00 kΩ R7 1 0 0kΩ R10 5 kΩ 1 G ND TR IGGER COMPARATOR FLIP FLOP ABSOLUTE MAXIMUM RATINGS Symbol Vcc Toper Tj Tstg 2/9 Parameter Value Supply Voltage Operating Free Air Temperature Range Junction Temperature Storage Temperature Range for NE556 for SA556 for SE556 Unit 18 V 0 to 70 –40 to 105 –55 to 125 °C 150 °C – 65 to 150 °C NE556/SA556/SE556 OPERATING CONDITIONS Symbol VCC Vth, Vtrig, Vcl, Vreset Parameter Supply Voltage Maximum Input Voltage SE556 NE556 - SA556 Unit 4.5 to 18 4.5 to 18 V VCC VCC V ELECTRICAL CHARACTERISTICS Tamb = +25oC, VCC = +5V to +15V (unless otherwise specified) Symbol Parameter ICC Supply Current (R L ∞) (- note 1) - (2 timers) Low State VCC = +5V VCC = +15V High State VCC = 5V VCL Vth Ith Vtrig Itrig SE556 Min. Max. 6 20 4 Timing Error (monostable) (RA = 2k to 100kΩ, C = 0.1µF) Initial Accuracy - (note 2) Drift with Temperature Drift with Supply Voltage 0.5 30 0.05 Timing Error (astable) (RA, R B = 1kΩ to 100kΩ, C = 0.1µF, VCC = +15V) Initial Accuracy - (note 2) Drift with Temperature Drift with Supply Voltage 1.5 90 0.15 Max. 10 24 6 20 4 12 30 2 100 0.2 1 50 0.1 3 0.5 2.25 150 0.3 9 2.6 10 3.33 11 4 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 0.1 0.25 0.1 0.25 5 1.67 5.2 1.9 5 1.67 5.6 2.2 0.5 0.9 0.5 2.0 0.7 1 0.7 1 V V Threshold Current - (note 3) µA V 4.8 1.45 Trigger Current (Vtrig = 0V) Reset Current % ppm/°C %/V % ppm/°C %/V 10.4 3.8 Trigger Voltage VCC = +15V VCC = +5V Unit mA 10 3.33 Reset Voltage - (note 4) 0.4 4.5 1.1 0.4 µA V mA 0.1 0.4 0.4 1 0.1 0.4 0.4 1.5 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 High Level Output Voltage VCC = +15V, IO(source) = 200mA IO(source) = 100mA IO(source) = 100mA VCC = +5V, 12.5 13.3 3.3 Vreset = +0.4V Vreset = 0V Notes : Typ. 9.6 2.9 Ireset VOH Min. Control Voltage level VCC = +15V VCC = +5V Vreset VOL NE556 - SA556 Typ. V 0.25 0.2 0.4 0.35 V 13 3 12.75 2.75 12.5 13.3 3.3 1. Supply current when output is high is typically 1mA less. 2. Tested at VCC = +5V and VCC = +15V. 3. This will determine the maximum value of RA + RB for +15V operation the max total is R = 20MΩ and for 5V operation the max total R = 3.5MΩ. 4. Specified with trigger input high. 3/9 NE556/SA556/SE556 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter SE556 Min. NE556 - SA556 Typ. Max. 20 100 Min. Typ. Max. 20 100 Idis (off) Discharge Pin Leakage Current (output high) (Vdis = 10V) Vdis(sat) Discharge pin Saturation Voltage (output low) - (note 5) 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 - (note 6) (Vreset = VCC) 0.5 tr tf toff Notes : Unit nA mV 0.5 ns µs 5. No protection against excessive Pin 7 current is necessary, providing the package dissipation rating will not be exceeded. 6. Time mesaured from a positive going input pulse from 0 to 0.8x VCC into the threshold to the drop from high to low of the output trigger is tied to treshold. Figure 1 : Minimum Pulse Width Required for Trigering Figure 2 : Supply Current versus Supply Voltage Figure 3 : Delay Time versus Temperature Figure 4 : Low Output Voltage versus Output Sink Current 4/9 NE556/SA556/SE556 Figure 5 : Low Output Voltage versus Output Sink Current Figure 6 : Low Output Voltage versus Output Sink Current Figure 7 : High Output Voltage Drop versus Output Figure 8 : Delay Time versus Supply Voltage Figure 9 : Propagation Delay versus Voltage Level of Trigger Value 5/9 NE556/SA556/SE556 TYPICAL APPLICATION 50% DUTY CYCLE OSCILLATOR PULSE WIDTH MODULATOR VCC VCC RA 51k Ω 4 14 Rs (10) Trigg e r (13) 1 6 (8) 1/2 NE556 S E556 Output RA 4 (10) 1/2 NE556 S E556 (12) 2 Output 0.01nF C 7 (13) 1 6 (8) 22kΩ (11) 3 5 (9) 14 (12) 2 (11) 3 5 (9) C 7 MODULATION INPUT t1= 0.693 RA.C RB − 2RA t2 = [(R ARB) ⁄ (RA + R B)] CLn 2RB − RA 1 1 f= RA ti RB < t1+ t2 2 t2 t1 6/9 NE556/SA556/SE556 TONE BURST GENERATOR 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 os the monostable. It is connected as an astable and determines the frequency of the tone. Re s e t Vcc 4 +15V 14 14 RA Rt Trigge r Trigge r 5 10 6 Output Re s e t Discha rge 1 Discha rge 13 RB 1/2 NE556 S E556 1/2 NE556 S E556 12 Thre s hold 8 Trigge r Control 2 3 Thre s hold C1 Output 11 C ontrol 9 Ground 0.01 µF Ground 0.01 µ F C2 Ground T = 1.1 R t .C1 1.44 f= R A + 2R B ) C MONOSTABLE OPERATION ASTABLE OPERATION VCC VCC RL RA 4 14 14 (10) (10) 6 (8) Trigge r RL RA 4 (13) 1 (13) 1 1/2 NE556 S E556 1/2 NE556 S E556 5 (9) O utput RB (12) (12) Output 5 (9) 7 (11) 2 RL 7 3 RL (11) 10nF C 3 2 (8) 6 C 0.01nF Opera ting frequency T = 1.1 R A .C 1.44 f= R A + 2R B ) C t1 = 0.693 (RA + RB) C Output High t2 = 0.693 RBC Output Low t2 t1 7/9 NE556/SA556/SE556 PACKAGE MECHANICAL DATA 14 PINS - PLASTIC DIP Dimensions a1 B b b1 D E e e3 F i L Z 8/9 Min. 0.51 1.39 Millimeters Typ. Max. 1.65 Min. 0.020 0.055 0.5 0.25 Inches Typ. 0.065 0.020 0.010 20 0.787 8.5 2.54 15.24 0.335 0.100 0.600 7.1 5.1 0.280 0.201 3.3 1.27 Max. 0.130 2.54 0.050 0.100 NE556/SA556/SE556 PACKAGE MECHANICAL DATA 14 PINS - PLASTIC MICROPACKAGE (SO) Dimensions A a1 a2 b b1 C c1 D E e e3 F G L M S Min. Millimeters Typ. 0.1 0.35 0.19 Max. 1.75 0.2 1.6 0.46 0.25 Min. Inches Typ. 0.004 0.014 0.007 0.5 Max. 0.069 0.008 0.063 0.018 0.010 0.020 o 45 (typ.) 8.55 5.8 8.75 6.2 0.336 0.228 1.27 7.62 3.8 4.6 0.5 0.334 0.244 0.050 0.300 4.0 5.3 1.27 0.68 0.150 0.181 0.020 0.157 0.208 0.050 0.027 o 8 (max.) Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this pub lication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST log o is a trademark of STMicroelectronics 1998 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdo m - U.S.A. 9/9