74HCT221D – NXP
Monostable Multi-vibrator SOT109-1 MONOSTABLE MULTIVBTR
Stock Quantity: 42
Selling Unit: Each
| Quantity | Price (ex VAT) |
|---|---|
| 1+ | 2.92 |
| 10+ | |
| 50+ | |
| 100+ |
42 in stock
Contact us for volume pricing
- Same day shipping if ordered before 14.00 GMT
- 6 month warranty on all stock items
- All stock held and shipped from our UK warehouse
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Overview
The NXP 74HCT221D is a dual non-retriggerable monostable multivibrator, essential for generating precisely timed output pulses in digital systems. Its core functionality lies in its edge-triggered inputs (nA and nB) and the ability to define output pulse width (tW) via external components (CEXT, REXT) according to tW = 0.7 × CEXTREXT. A critical design consideration is that while the output pulse is independent of further input transitions after triggering, the stability of the generated pulse width is primarily limited by the tolerance and temperature drift of these external timing components, a common trade-off in analog timing circuits requiring high precision.
Key Features
- Dual non-retriggerable monostable multivibrator
- Edge-triggered inputs with Schmitt-trigger noise immunity on nB
- Output pulse width defined by external RC network (tW = 0.7 × CEXTREXT)
- Active LOW reset input (nRD) for pulse termination
- TTL-compatible input threshold levels
- DIP-16 package (19.3 x 7.6 x 3.3 mm)
Applications
The component is engineered for deployment in systems requiring high reliability and performance under specific operating conditions. It provides functional stability across the stated design envelope.
- Precise pulse generation for digital timing control
- Debouncing mechanical switches in control interfaces
- Creating delay circuits in sequential logic
- Generating watchdog timer reset pulses
