9602/DM9602 Dual Retriggerable, Resettable One Shots General Description Features 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. Y Y Y Y Y Y Y 70 ns to % output width range Resettable and retriggerable0% to 100% duty cycle TTL input gatingleading 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. Operation A B CLR HxL H X L LxH X H H L Trigger Trigger Reset 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. 9602/DM9602 Dual Retriggerable, Resettable One Shots June 1989 Absolute Maximum Ratings (Note) 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. 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 Recommended Operating Conditions Symbol Military Parameter VCC Supply Voltage VIH High Level Input Voltage TA e b55 C Commercial Nom Max Min Nom Max 4.5 5 5.5 4.75 5 5.25 TA e 0 C 1.9 1.7 1.8 TA e 75 C V 1.65 TA e 125 C Low Level Input Voltage V 2 TA e 25 C VIL Units Min 1.5 TA e b55 C 0.85 TA e 0 C 0.85 TA e 25 C 0.9 0.85 TA e 75 C V 0.85 TA e 125 C 0.85 IOH High Level Output Current b 0.8 b 0.8 mA IOL Low Level Output Current 16 16 mA TA Free Air Operating Temperature 75 C Electrical Characteristics Symbol Input Clamp Voltage VOH High Level Output Voltage VOL Low Level Output Voltage 125 Conditions (Note 3) 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) IIH High Level Input Current VCC e Max, VI e 4.5V IIL Low Level Input Current VCC e Max ICC Min Typ (Note 1) Max Units b 1.5 V 2.4 V MIL 0.4 COM 0.45 60 MIL VI e 0.40V V mA b 1.6 COM VI e 0.45V VCC e Min IOS 0 over recommended operating free air temperature range (unless otherwise noted) Parameter VI b 55 b 1.6 MIL VI e 0.40V b 1.24 COM VI e 0.45V b 1.41 Short Circuit Output Current VCC e Max, VOUT e 1V MIL b 25 (Notes 2 and 4) COM b 35 Supply Current VCC e Max MIL 39 45 COM 39 50 mA mA mA 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, TA e 25 C (See Section 1 for Test Waveforms and Output Load) Symbol Parameter Military Conditions Min tPLH Propagation Delay Time, Low-to-High Level Output Negative Trigger Input to True Output tPHL Propagation Delay Time, High-to-Low Level Output Negative Trigger Input To Complement Output tPW(MIN) Minimum True Output Pulse Width CL e 15 pF CX e 0 RX e 5 kX Max Commercial Min Units Max 35 40 ns 43 48 ns 90 100 100 110 ns Minimum Complement Pulse Width tPW Pulse Width RX e 10 kX CX e 1000 pF CSTRAY Maximum Allowable Wiring Capacitance Pins 2, 14 to GND RX External Timing Resistor 3.08 3.76 3.08 50 5 25 5 3.76 ms 50 pF 50 kX Logic Diagrams TL/F/6611 - 2 TL/F/6611 - 3 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: 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. Operating Rules 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. t e K RXCX 1 a R k 0.6 RX (Max) 3 TL/F/6611 - 4 Operating Rules (Continued) 7. Input Trigger Pulse Rules (See Triggering Truth Table) 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 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) 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: (5 kX s RY s 10 kX is recommended) Q1: NPN silicon transistor with hFE requirements of above equations, such as 2N5961 or 2N5962. tW e t a tPLH e K RX CX t & 0.3 RCX #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 & 0.3 CX (ns) after the initial trigger pulse (i.e., during the discharge cycle). 9. Reset OperationAn 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/6611-6 This configuration is not recommended with retriggerable operation. 5. To obtain variable pulse width by remote trimming, the following circuit is recommended: 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 - 13 TL/F/6611 - 12 FIGURE 2. Normalized Output Pulse Width vs Ambient Temperature FIGURE 1. Output Pulse Width vs Timing Resistance and Capacitance for CX k 103 pF 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 TL/F/6611 - 17 FIGURE 5. Minimum Output Pulse Width vs Ambient Temperature 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. 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