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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 by a LOW signal applied to CD which also prevents trigger-
inputs complementary outputs an optional 10 kX internal ing An internal connection from CD to the input gate makes
timing resistor and an overriding Direct Clear (CD) input it possible to trigger the circuit by a positive-going signal on
When the circuit is in the quasi-stable (delay) state another CD as shown in the Truth Table For timing capacitor values
trigger applied to the inputs (per Truth Table) will cause the greater than 1000 pF the output pulse width is defined as
delay period to start again without disturbing the outputs follows
This process can be repeated indefinitely and thus the out- tw e 0 32 RXCX (1 0 a 0 7 RX)
put pulse period (Q HIGH Q LOW) can be made as long as
Where tw is in ns RX is in kX and CX is in pF
desired Alternatively a delay period can be terminated
Connection Diagram Logic Symbol
Dual-In-Line Package
TL F 10212