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DM74122 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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DM74122 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 6 page TLF10212 June 1989 54122DM74122 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 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 CD which also prevents trigger- ing 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 032 RXCX (10 a 07RX) Where tw is in ns RX is in kX and CX is in pF Connection Diagram Dual-In-Line Package TLF10212 – 1 Order Number 54122DMQB 54122FMQB or DM74122N See NS Package Number J14A N14A or W14B Logic Symbol TLF10212 – 2 VCC e Pin 14 GND e Pin 7 NC e Pins 10 and 12 Pin Names Description A1 A2 Trigger Inputs (Active Falling Edge) B1 B2 Trigger Inputs (Active Rising Edge) CD Direct Clear Inputs (Active LOW) Q Q Outputs C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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