SA - SE GENERAL PURPOSE DUAL BIPOLAR TIMERS. LOW TURN OFF TIME MAXIMUM OPERATING FREQUENCY GREATER THAN 00kHz. TIMING FROM MICROSECONDS TO HOURS. OPERATES IN BOTH ASTABLE AND MONOSTABLE MODES HIGH OUTPUT CURRENT CAN SOURCE OR SINK 00mA ADJUSTABLE DUTY CYCLE. TTL COMPATIBLE TEMPERATURE STABILITY OF 0.00% PER o C N DIP (Plastic Package) D SO (Plastic Micropackage) DESCRIPTION The 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 00mA. ORDER CODES Part Temperature Pakcage Number Range N D 0 o C, 70 o C SA 0 o C, 0 o C SE o C, o C PIN CONNECTIONS (top view) Discharge Thres hold Discharge Control Voltage Threshold Reset Control Voltage 0 Reset Trigger 9 GND 7 8 Trigger July 998 /9
/SA/SE BLOCK DIAGRAM + kω THRESHOLD CONTROL VOLTAGE COMP R DISCHARGE FLIP-FLOP kω Q TRIGGER COMP S INHIBIT/ RESET OUT / kω RESET S SCHEMATIC DIAGRAM THRESHOLD COMPARATOR CONTROL VOLTAGE OUTPUT R.7kΩ R 80Ω R.7kΩ R kω kω R8 R.8kΩ Q Q Q7 Q8 Q9 Q9 Q0 Q Ρ Q THRESHOLD Q Q Q Q Q Q R9 kω R kω D R7.7kΩ Q.9 kω D R 0Ω Q TRIGGER Q0 Q Q Q8 R 00Ω R.7kΩ RESET DISCHARGE 7 Q Q7 GND Q R 0kΩ R 00kΩ R7 00kΩ R0 kω TRIGGER COMPARATOR FLIP FLOP ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit Vcc Supply Voltage 8 V T oper Operating Free Air Temperature Range for for SA for SE 0to70 0 to 0 to Tj Junction Temperature 0 C T stg Storage Temperature Range to 0 C C /9
/SA/SE OPERATING CONDITIONS Symbol Parameter SE - SA Unit Supply Voltage. to 8. to 8 V V th,v trig,v cl,v reset Maximum Input Voltage V ELECTRICAL CHARACTERISTICS Tamb = + o C, VCC = +V to +V (unless otherwise specified) Symbol I CC VCL Vth Notes : Parameter Supply Current (R L ) (- note ) - ( timers) Low State = +V VCC = +V High State VCC = V Timing Error (monostable) (RA =k to 00kΩ, C = 0.µF) Initial Accuracy - (note ) Drift with Temperature Drift with Supply Voltage Timing Error (astable) (RA, RB=kΩto 00kΩ, C = 0.µF, VCC = +V) Initial Accuracy - (note ) Drift with Temperature Drift with Supply Voltage Control Voltage level VCC = +V VCC = +V Threshold Voltage VCC = +V VCC = +V SE - SA Min. Typ. Max. Min. Typ. Max. 9..9 9..7. Supply current when output is high is typically ma less.. Tested at = +V and = +V.. This will determine the maximum value of RA +RB for +V operation the max total is R = 0MΩ and for V operation the max total R =.MΩ.. Specified with trigger input high. 0 0. 0 0.0. 90 0. 0. 0. 0 00 0. 0..8 0. 9. 8.8. 0 0 0.. 0 0. 0. 0. 0 0... Unit ma % ppm/ C %/V % ppm/ C %/V I th Threshold Current - (note ) 0. 0. 0. 0. µa V trig Trigger Voltage = +V = +V.8. I trig Trigger Current (V trig = 0V) 0. 0.9 0..0 µa Vreset Reset Voltage - (note ) 0. 0.7 0. 0.7 V I reset VOL VOH Reset Current V reset = +0.V Vreset = 0V Low Level Voltage = +V, I O(sink) = 0mA I O(sink) = 0mA IO(sink) = 00mA IO(sink) = 00mA VCC = +V, IO(sink) = 8mA IO(sink) = ma High Level Voltage VCC = +V, IO(source) = 00mA IO(source) = 00mA VCC = +V, IO(source) = 00mA.7 0. 0. 0. 0.. 0. 0.0.....9 0. 0. 0.. 0. 0....7.7.7 0. 0. 0. 0.. 0. 0...... 0.. 0. 0.7. 0. 0. V V V ma V V /9
/SA/SE ELECTRICAL CHARACTERISTICS (continued) Symbol I dis(off) V dis(sat) tr t f Notes : Parameter Discharge Pin Leakage Current (output high) (V dis = 0V) Discharge pin Saturation Voltage (output low) - (note ) VCC = +V, Idis = ma VCC = +V, Idis =.ma Rise Time Fall Time SE - SA Min. Typ. Max. Min. Typ. Max.. No protection against excessive Pin 7 current is necessary, providing the package dissipation rating will not be exceeded.. 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. Unit 0 00 0 00 na toff Turn off Time - (note ) (Vreset = VCC) 0. 0. µs 80 80 00 00 80 00 00 00 80 80 00 00 80 00 00 00 mv ns Figure : Minimum Pulse Width Required for Trigering Figure : Supply Current versus Supply Voltage Figure : Delay Time versus Temperature Figure : Low Voltage versus Sink Current /9
/SA/SE Figure : Low Voltage versus Sink Current Figure : Low Voltage versus Sink Current Figure 7 : High Voltage Drop versus Figure 8 : Delay Time versus Supply Voltage Figure 9 : Propagation Delay versus Voltage Level of Trigger Value /9
/SA/SE TYPICAL APPLICATION 0% DUTY CYCLE OSCILLATOR PULSE WIDTH MODULATOR (8) (0) / SE () () R s kω RA kω Trigger (0) (8) / SE () () R A (9) () 7 0.0nF C (9) () 7 C MODULATION INPUT t = 0.9 R A.C t = [(RARB) (RA + RB)] CLn RB RA RB RA f = t + t R B < R A ti t t /9
/SA/SE 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. The second timer is enabledby the high output os the monostable. It is connected as an astable and determines the frequency of the tone. R t Reset Vcc R A +V Trigger 0 Discharge Trigger Reset Discharge / SE Control / SE R B Threshold 8 Trigger Control Threshold 9 C Ground 0.0µF Ground 0.0µF C T=.R.C t f=. R + R ) C B A Ground MONOSTABLE OPERATION ASTABLE OPERATION Trigge r R L (0) (8) / SE () RA R L (0) () / (9) SE RA R B R L (9) 7 () () 0nF C R L () () (8) 7 0.0nF C T=.R.C A Operating frequency f=. R + R ) C B A t = 0.9 (R A +R B ) C High t = 0.9 R B C Low t t 7/9
/SA/SE PACKAGE MECHANICAL DATA PINS - PLASTIC DIP Dimensions Millimeters Inches Min. Typ. Max. Min. Typ. Max. a 0. 0.00 B.9. 0.0 0.0 b 0. 0.00 b 0. 0.00 D 0 0.787 E 8. 0. e. 0.00 e. 0.00 F 7. 0.80 i. 0.0 L. 0.0 Z.7. 0.00 0.00 8/9
/SA/SE PACKAGE MECHANICAL DATA PINS - PLASTIC MICROPACKAGE (SO) Dimensions Millimeters Inches Min. Typ. Max. Min. Typ. Max. A.7 0.09 a 0. 0. 0.00 0.008 a. 0.0 b 0. 0. 0.0 0.08 b 0.9 0. 0.007 0.00 C 0. 0.00 c o (typ.) D 8. 8.7 0. 0. E.8. 0.8 0. e.7 0.00 e 7. 0.00 F.8.0 0.0 0.7 G.. 0.8 0.08 L 0..7 0.00 0.00 M 0.8 0.07 S 8 o (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 publication 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 logo is a trademark of STMicroelectronics 998 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
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