DM74122

DM74122 NSC | Alldatasheet

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54122/DM74122 Retriggerable Resettable Multivibrator June 1989 54122/DM74122 Retriggerable Resettable Multivibrator General Description The ’122 features positive and negative DC level triggering inputs, complementary outputs, an optional 10 k X internal timing resistor and an overriding Direct Clear (C D) input. When the circuit is in the quasi-stable (delay) state, another trigger applied to the inputs (per Truth Table) will cause the delay period to start again, without disturbing the outputs. This process can be repeated indefinitely and thus the out- put pulse period (Q HIGH, Q LOW) can be made as long as desired. Alternatively, a delay period can be terminated by a LOW signal applied to C D, which also prevents trigger- ing. An internal connection from C D to the input gate makes it possible to trigger the circuit by a positive-going signal on C D, as shown in the Truth Table. For timing capacitor values greater than 1000 pF, the output pulse width is defined as follows: t w e 0.32 R XCX (1.0 a 0.7/RX) Where t w is in ns, R X is in k X and C X is in pF. Connection Diagram Dual-In-Line Package TL/F/10212–1 Order Number 54122DMQB, 54122FMQB or DM74122N See NS Package Number J14A, N14A or W14B Logic Symbol TL/F/10212–2 VCC e Pin 14 GND e Pin 7 NC e Pins 10 and 12 Pin Names Description A1,A 2 Trigger Inputs (Active Falling Edge) B1,B 2 Trigger Inputs (Active Rising Edge) CD Direct Clear Inputs (Active LOW) Q, Q Outputs C1995 National Semiconductor Corporation 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 b55§Ct o a125§C DM74 0 §Ct o a70§C Storage Temperature Range b65§Ct o a150§C Note: The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaran- teed. 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 Parameter 54122 DM74122 Units Min Nom Max Min Nom Max VCC Supply Voltage 4.5 5 5.5 4.75 5 5.5 V VIH High Level Input Voltage 2 2 V VIL Low Level Input Voltage 0.8 0.8 V IOH High Level Output Current b0.8 b0.8 mA IOL Low Level Output Current 16 16 mA TA Free Air Operating Temperature b55 125 b55 70 §C Recommended Operating Conditions VCC ea 5.0V, T A ea 25§C Symbol Parameter Conditions DM74 Units Min Max tw Trigger Pulse Width 40 ns RX External Timing Resistor XC Over Operating V CC and 5.0 50 kX XM Temperature Range 5.0 25 CX External Timing Capacitor No Restrictions pF Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ Max Units(Note 1) VI Input Clamp Voltage V CC e Min, I I eb 12 mA b1.5 V VOH High Level Output Voltage V CC e Min, I OH e Max, 2.4 VVIL e Max VOL Low Level Output Voltage V CC e Min, V IH e Min 0.4 V II Input Current @ Max V CC e Max, V I e 5.5V 1m AInput Voltage IIH High Level Input Current V CC e Max, V I e 2.4V Inputs 40 mA Clear 80 IIL Low Level Input Current V CC e Max, V I e 0.4V Inputs b1.6 mA Clear b3.2 IOS Short Circuit Output Current V CC e Max (Note 2) b10 b40 mA ICC Supply Current V CC e Max 28 mA Note 1: All typicals are at V CC e 5V, T A e 25§C. Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.

VCC ea 5.0V, T A ea 25§C (See Section 3 for waveforms and load configurations) Symbol Parameter Conditions CL e 15 pF UnitsRL e 400X Min Max tPLH Propagation Delay 28 nsBt oQ tPLH Propagation Delay 33 nsA to Q C X e 0 pF, R X e 5k X tPLH Propagation Delay Figure 3-1, Figure a 36 nsBt oQ tPHL Propagation Delay 40 nsA to Q tPLH Propagation Delay 40 nsCD to Q CX e 0 pF, R X e 5k X tPHL Propagation Delay Figure 3-1, Figure 3-10 27 nsCD to Q tw(out) Pulse Width at Q with Zero C X e 0 pF, R X e 5k X 65 nsTiming Capacitor Figure 3-1, Figure a tw(out) Pulse Width with External C X e 1000 pF, R X e 10 k X 3.08 3.76 msTiming Components Figure 3-1, Figure a Triggering Truth Table Inputs* Response CD A1 A2 B1 B2 L X X X X No Trigger X K L X X No Trigger X K X L X No Trigger H K H H H Trigger XX X L L No Trigger XH H L X No Trigger HL X L H Trigger L L X H H Trigger H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial *Input pins 1 and 2 are logically interchangeable, as are input pins 3 and 4.

Pulse Width vs R X and C X TL/F/10212–3 Timing Capacitor C X –pF TL/F/10212–4 FIGURE A

Physical Dimensions inches (millimeters) 14-Lead Ceramic Dual-In-Line Package (J) Order Number 54122DMQB 14-Lead Molded Dual-In-Line Package (N) Order Number DM74122N

54122/DM74122 Retriggerable Resettable Multivibrator Physical Dimensions inches (millimeters) (Continued) 14-Lead Ceramic Flat Package (W) Order Number 54122FMQB 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 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.

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