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DM74122 Dataheets PDF



Part Number DM74122
Manufacturers National Semiconductor
Logo National Semiconductor
Description Retriggerable Resettable Multivibrator
Datasheet DM74122 DatasheetDM74122 Datasheet (PDF)

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 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.

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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 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) Where tw is in ns RX is in kX and CX is in pF Connection Diagram Dual-In-Line Package Logic Symbol TL F 10212 – 2 TL F 10212 – 1 Order Number 54122DMQB 54122FMQB or DM74122N See NS Package Number J14A N14A or W14B VCC e Pin 14 GND e Pin 7 NC e Pins 10 and 12 Pin Names A1 A2 B1 B2 CD Q Q Description Trigger Inputs (Active Falling Edge) Trigger Inputs (Active Rising Edge) Direct Clear Inputs (Active LOW) Outputs C1995 National Semiconductor Corporation TL F 10212 RRD-B30M105 Printed in U S A 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 VCC VIH VIL IOH IOL TA Parameter Min Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Free Air Operating Temperature b 55 54122 Nom 5 Max 55 Min 4 75 2 08 b0 8 DM74122 Nom 5 Max 55 Units V V 08 b0 8 45 2 V mA mA C 16 125 b 55 16 70 Recommended Operating Conditions VCC e a 5 0V Symbol tw RX Parameter Trigger Pulse Width External Timing Resistor XC XM CX External Timing Capacitor Conditions TA e a 25 C DM74 Min 40 Max ns 50 25 pF kX Units Over Operating VCC and Temperature Range 50 50 No Restrictions Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL II IIH.


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