54122/DM74122 Retriggerable Resettable Multivibrator General Description The ’122 features positive and negative DC level triggering inputs, complementary outputs, an optional 10 kX internal timing resistor and an overriding Direct Clear (CD) 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 output 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 CD, which also prevents triggering. An internal connection from CD to the input gate makes it possible to trigger the circuit by a positive-going signal on CD, as shown in the Truth Table. For timing capacitor values greater than 1000 pF, the output pulse width is defined as follows: tw e 0.32 RXCX (1.0 a 0.7/RX) Connection Diagram Logic Symbol Where tw is in ns, RX is in kX and CX is in pF. Dual-In-Line Package TL/F/10212 – 2 VCC e Pin 14 GND e Pin 7 NC e Pins 10 and 12 TL/F/10212 – 1 Order Number 54122DMQB, 54122FMQB or DM74122N See NS Package Number J14A, N14A or W14B Pin Names A1, A2 B1, B2 CD Q, Q C1995 National Semiconductor Corporation TL/F/10212 Description Trigger Inputs (Active Falling Edge) Trigger Inputs (Active Rising Edge) Direct Clear Inputs (Active LOW) Outputs RRD-B30M105/Printed in U. S. A. 54122/DM74122 Retriggerable Resettable Multivibrator 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 54 DM74 0§ C to a 70§ C b 65§ C to a 150§ C Storage Temperature Range Recommended Operating Conditions Symbol 54122 Parameter VCC Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage IOH High Level Output Current IOL Low Level Output Current TA Free Air Operating Temperature DM74122 Units Min Nom Max Min Nom Max 4.5 5 5.5 4.75 5 5.5 2 2 V 0.8 0.8 V b 0.8 b 0.8 mA 16 mA 70 §C 16 b 55 V 125 b 55 Recommended Operating Conditions VCC e a 5.0V, TA e a 25§ C Symbol Parameter DM74 Conditions Min tw Trigger Pulse Width RX External Timing Resistor 40 XC Over Operating VCC and Temperature Range XM CX Units Max External Timing Capacitor ns 5.0 50 5.0 25 kX No Restrictions pF Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ (Note 1) Max Units b 1.5 V VI Input Clamp Voltage VCC e Min, II e b12 mA VOH High Level Output Voltage VCC e Min, IOH e Max, VIL e Max VOL Low Level Output Voltage VCC e Min, VIH e Min 0.4 V II Input Current Input Voltage VCC e Max, VI e 5.5V 1 mA IIH High Level Input Current IIL @ Max Low Level Input Current VCC e Max, VI e 2.4V VCC e Max, VI e 0.4V IOS Short Circuit Output Current VCC e Max (Note 2) ICC Supply Current VCC e Max 2.4 Inputs 40 Clear 80 Inputs b 1.6 Clear b 3.2 b 10 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, and the duration should not exceed one second. 2 V mA mA b 40 mA 28 mA Switching Characteristics VCC e a 5.0V, TA e a 25§ C (See Section 3 for waveforms and load configurations) 54/74 Symbol Parameter Conditions CL e 15 pF RL e 400X Min tPLH Propagation Delay B to Q tPLH Propagation Delay A to Q tPLH Propagation Delay B to Q tPHL Propagation Delay A to Q tPLH Propagation Delay CD to Q CX e 0 pF, RX e 5 kX Figure 3-1, Figure a CX e 0 pF, RX e 5 kX Figure 3-1, Figure 3-10 tPHL Propagation Delay CD to Q tw(out) Pulse Width at Q with Zero Timing Capacitor CX e 0 pF, RX e 5 kX Figure 3-1, Figure a tw(out) Pulse Width with External Timing Components CX e 1000 pF, RX e 10 kX Figure 3-1, Figure a Triggering Truth Table Inputs* Response CD A1 A2 B1 B2 L X X H X K K K X L X H X X L H X X X H No Trigger No Trigger No Trigger Trigger X H L L X H X X L L L H L X H H No Trigger No Trigger Trigger Trigger X X H L 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. 3 3.08 Units Max 28 ns 33 ns 36 ns 40 ns 40 ns 27 ns 65 ns 3.76 ms Pulse Width vs RX and CX TL/F/10212 – 3 Timing Capacitor CX –pF TL/F/10212 – 4 FIGURE A 4 Physical Dimensions inches (millimeters) 14-Lead Ceramic Dual-In-Line Package (J) Order Number 54122DMQB NS Package Number J14A 14-Lead Molded Dual-In-Line Package (N) Order Number DM74122N NS Package Number N14A 5 54122/DM74122 Retriggerable Resettable Multivibrator Physical Dimensions inches (millimeters) (Continued) 14-Lead Ceramic Flat Package (W) Order Number 54122FMQB NS Package Number W14B 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. 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