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| 9602 DM9602 Dual Retriggerable Resettable One Shots June 1989 9602 DM9602 Dual Retriggerable Resettable One Shots General Description These dual resettable retriggerable one shots have two inputs per function one which is active high and one which is active low This allows the designer to employ either leading-edge or trailing-edge triggering which is independent of input transition times When input conditions for triggering are met a new cycle starts and the external capacitor is allowed to rapidly discharge and then charge again The retriggerable feature permits output pulse widths to be extended In fact a continuous true output can be maintained by having an input cycle time which is shorter than the output cycle time The output pulse may then be terminated at any time by applying a low logic level to the RESET pin Retriggering may be inhibited by either connecting the Q output to an active high input or the Q output to an active low input Features Y Y Y Y Y Y Y 70 ns to % output width range Resettable and retriggerable 0% to 100% duty cycle TTL input gating leading or trailing edge triggering Complementary TTL outputs Optional retrigger lock-out capability Pulse width compensated for VCC and temperature variations Alternate Military Aerospace device (54xxx) is available Contact a National Semiconductor Sales Office Distributor for specifications Connection Diagram Dual-In-Line Package TL F 6611 - 1 Order Number 9602DMQB 9602FMQB or DM9602N See NS Package Number J16A N16E or W16A Function Table Pin No's A HxL H X B L LxH X CLR H H L Trigger Trigger Reset Operation H e High Voltage Level L e Low Voltage Level X e Don't Care C1995 National Semiconductor Corporation TL F 6611 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage 7V Input Voltage 5 5V Operating Free Air Temperature Range b 55 C to a 125 C Military Commercial 0 C to a 70 C Storage Temperature Range b 65 C to a 150 C Note The ``Absolute Maximum Ratings'' are those values beyond which the safety of the device cannot be guaranteed The device should not be operated at these limits The parametric values defined in the ``Electrical Characteristics'' table are not guaranteed at the absolute maximum ratings The ``Recommended Operating Conditions'' table will define the conditions for actual device operation Recommended Operating Conditions Symbol VCC VIH Parameter Min Supply Voltage High Level Input Voltage TA e b55 C TA e 0 C TA e 25 C TA e 75 C TA e 125 C VIL Low Level Input Voltage TA e b55 C TA e 0 C TA e 25 C TA e 75 C TA e 125 C IOH IOL TA High Level Output Current Low Level Output Current Free Air Operating Temperature b 55 Military Nom 5 Max 55 Min 4 75 19 17 15 0 85 18 1 65 45 2 Commercial Nom 5 Max 5 25 Units V V 0 85 09 0 85 b0 8 b0 8 0 85 0 85 V mA mA C 16 125 0 16 75 Electrical Characteristics Symbol VI VOH Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage High Level Input Current Low Level Input Current over recommended operating free air temperature range (unless otherwise noted) Conditions (Note 3) Min Typ (Note 1) Max b1 5 Units V V VCC e Min II e b12 mA VCC e Min IOH e Max VIL e Max VIH e Min (Note 4) VCC e Min IOL e Max VIL e Max VIH e Min (Note 4) VCC e Max VI e 4 5V VCC e Max VCC e Min MIL VI e 0 40V COM VI e 0 45V MIL VI e 0 40V COM VI e 0 45V MIL COM MIL COM MIL COM 24 04 0 45 60 b1 6 b1 6 b 1 24 b 1 41 b 25 b 35 VOL V mA IIH IIL mA IOS ICC Short Circuit Output Current Supply Current VCC e Max VOUT e 1V (Notes 2 and 4) VCC e Max mA mA 39 39 45 50 Note 1 All typicals are at VCC e 5V TA e 25 C Note 2 Not more than one output should be shorted at a time Note 3 Unless otherwise noted RX e 10k for all tests Note 4 Ground PIN 1(15) for VOL on PIN 7(9) or VOH and IOS on PIN 6(10) and apply momentary ground to PIN 4(12) Open PIN 1(15) for VOL on PIN 6(10) or VOH and IOS on PIN 7(9) 2 Switching Characteristics VCC e 5V Symbol tPLH tPHL tPW(MIN) Parameter Propagation Delay Time Low-to-High Level Output Propagation Delay Time High-to-Low Level Output Minimum True Output Pulse Width Minimum Complement Pulse Width tPW CSTRAY RX Pulse Width Maximum Allowable Wiring Capacitance External Timing Resistor TA e 25 C (See Section 1 for Test Waveforms and Output Load) Conditions Military Min Max 35 43 90 100 RX e 10 kX CX e 1000 pF Pins 2 14 to GND 5 3 08 3 76 50 25 5 3 08 Commercial Min Max 40 48 100 ns 110 3 76 50 50 ms pF kX ns ns Units Negative Trigger Input to True Output Negative Trigger Input To Complement Output CL e 15 pF CX e 0 RX e 5 kX Logic Diagrams TL F 6611 - 2 TL F 6611 - 3 Operating Rules 1 An external resistor (RX) and external capacitor (CX) are required as shown in the Logic Diagram 2 The value of CX may vary from 0 to any necessary value available If however the capacitor has leakages approaching 3 0 mA or if stray capacitance from either terminal to ground is more than 50 pF the timing equations may not represent the pulse width obtained 3 The output pulse with (t) is defined as follows t e K RXCX 1 a where 1 for CX l 103 pF K 0 34 RX RX is in kX CX is in pF t is in ns for CX k 103 pF see Figure 1 for K vs CX see Figure 6 4 If electrolytic type capacitors are to be used the following three configurations are recommended A Use with low leakage capacitors The normal RC configuration can be used predictably only if the forward capacitor leakage at 5 0V is less than 3 mA and the inverse capacitor leakage at 1 0V is less than 5 mA over the operational temperature range ( R k 0 6 RX (Max) TL F 6611 - 4 3 Operating Rules (Continued) B Use with high inverse leakage current electrolytic capacitors The diode in this configuration prevents high inverse leakage currents through the capacitor by preventing an inverse voltage across the capacitor The use of this configuration is not recommended with retriggerable operation t 0 3 RCX 7 Input Trigger Pulse Rules (See Triggering Truth Table) TL F 6611 - 8 Input to Pin 5(11) (Pin 3(13) e HIGH) Pin 4(12) e LOW t1 t3 e Min Positive Input Pulse Width l 40 ns t2 t4 e Min Negative Input Pulse Width l 40 ns TL F 6611-5 C Use to obtain extended pulse widths This configuration can be used to obtain extended pulse widths because of the larger timing resistor allowed by beta multiplication Electrolytics with high inverse leakage currents can be used R k RX (0 7) (hFE Q1) or k 2 5 MX whichever is the lesser RX (min) k RY k RX (max) (5 kX s RY s 10 kX is recommended) Q1 NPN silicon transistor with hFE requirements of above equations such as 2N5961 or 2N5962 t 0 3 RCX TL F 6611 - 9 Input to Pin 4(12) Pin 5(11) e HIGH (Pin 3(13) e HIGH) 8 The retriggerable pulse width is calculated as shown below tW e t a tPLH e K RX CX 1 a 1 RX J a tPLH TL F 6611 - 10 The retrigger pulse width is equal to the pulse width (t) plus a delay time For pulse widths greater than 500 ns tW can be approximated as t Retriggering will not occur if the retrigger pulse comes within pulse (i e during the discharge cycle) TL F 6611-6 0 3 CX (ns) after the initial trigger This configuration is not recommended with retriggerable operation 5 To obtain variable pulse width by remote trimming the following circuit is recommended 9 Reset Operation An overriding clear (active LOW level) is provided on each one shot By applying a LOW to the reset any timing cycle can be terminated or any new cycle inhibited until the LOW reset input is removed Trigger inputs will not produce spikes in the output when the reset is held LOW TL F 6611-7 6 Under any operating condition CX and RX (min) must be kept as close to the circuit as possible to minimize stray capacitance and reduce noise pickup TL F 6611 - 11 10 VCC and Ground wiring should conform to good high frequency standards so that switching transients on VCC and Ground leads do not cause interaction between one shots Use of a 0 01 to 0 1 mF bypass capacitor between VCC and Ground located near the DM9602 is recommended For further detailed device characteristics and output performance please refer to the NSC one-shot application note AN-366 4 Typical Performance Characteristics TL F 6611 - 12 TL F 6611 - 13 FIGURE 1 Output Pulse Width vs Timing Resistance and Capacitance for CX k 103 pF FIGURE 2 Normalized Output Pulse Width vs Ambient Temperature TL F 6611 - 14 TL F 6611 - 15 FIGURE 3 Pulse Width vs Timing Resistor FIGURE 4 Normalized Output Pulse Width vs Supply Voltage TL F 6611 - 16 FIGURE 5 Minimum Output Pulse Width vs Ambient Temperature TL F 6611 - 17 FIGURE 6 Typical ``K'' Coefficient Variation vs Timing Capacitance 5 6 Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) Order Number 9602DMQB NS Package Number J16A 16-Lead Molded Dual-In-Line Package (N) Order Number DM9602N NS Package Number N16E 7 9602 DM9602 Dual Retriggerable Resettable One Shots Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 9602FMQB NS Package Number W16A LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user National Semiconductor Corporation 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018 2 A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness National Semiconductor Europe Fax (a49) 0-180-530 85 86 Email cnjwge tevm2 nsc com Deutsch Tel (a49) 0-180-530 85 85 English Tel (a49) 0-180-532 78 32 Fran ais Tel (a49) 0-180-532 93 58 Italiano Tel (a49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd 13th Floor Straight Block Ocean Centre 5 Canton Rd Tsimshatsui Kowloon Hong Kong Tel (852) 2737-1600 Fax (852) 2736-9960 National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408 National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications |
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