These d-c triggered multivibrators feature output pulse-duration control by three methods. The basic pulse time is programmed by selection of external resistance and capacitance values (see typical application data). The '122 and 'LS122 have internal timing resistors that allow the circuits to be used with only an external capacitor, if so desired. Once triggered, the basic pulse duration may be extended by retriggering the gated low-level-active (A) or high-level-active (B) inputs, or be reduced by use of the overriding clear. Figure 1 illustrates pulse control by retriggering and early clear.
The 'LS122 and 'LS123 are provided enough Schmitt hysteresis to ensure jitter-free triggering from the B input with transition rates as slow as 0.1 millivolt per nanosecond.
The Rint is nominally 10 k
for '122 and 'LS122.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | Retriggerable Monostable Multivibrators datasheet | Dec 1, 1983 | |
| Application note | Designing With the SN74LVC1G123 Monostable Multivibrator (Rev. A) | PDF | HTML | Mar 13, 2020 | |
| Application note | Designing with the SN54/74LS123 (Rev. A) | Mar 1, 1997 |
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The 14-24-LOGIC-EVM evaluation module (EVM) is designed to support any logic device that is in a 14-pin to 24-pin D, DW, DB, NS, PW, DYY or DGV package,
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SSOP (DB) | 16 | Ultra Librarian |
| SOP (NS) | 16 | Ultra Librarian |
| SOIC (D) | 16 | Ultra Librarian |
| PDIP (N) | 16 | Ultra Librarian |
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