CD54HC221F3A Texas Instruments Inductor (Ceramic Dual-In-Line Packages) In Stock
Texas Instruments CD54HC221F3A is a dual non-retriggerable monostable multivibrator with 50 pF load capacitance and 5.2 mA output current in a 16-pin ceramic DIP package, operating across military temperature range. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD54HC221F3A Datasheet PDF
- Category
- Inductor
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual non-retriggerable monostable multivibrator with positive and negative edge triggering and active-LOW clear for precise one-shot pulse generation in 2 independent channels
- HC-family logic with 50 pF load capacitance and 5.2 mA output sink current, operating from 2 V to 6 V supply across military temperature range -55°C to +125°C
- 16-pin ceramic hermetic DIP (GDIP) package with external RC timing network for adjustable pulse widths from nanoseconds to seconds in high-reliability defense and aerospace applications
Applications
The CD54HC221F3A is used in military and aerospace digital systems for generating precise timing pulses, debounced trigger signals, and one-shot outputs required in data acquisition strobe circuits and control sequencing. Its dual independent channels allow two separate monostable timing functions in a single ceramic 16-pin DIP, reducing component count in ruggedized avionics and weapons control electronics. The external RC timing network and non-retriggerable operation make it suitable for watchdog timeout generation and pulse stretching in harsh-environment industrial control modules.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | NON-RETRIGGERABLE |
| Family | HC/UH |
| JESD-30 Code | R-GDIP-T16 |
| JESD-609 Code | e0 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | MONOSTABLE MULTIVIBRATOR |
| Max I(ol) | 0.0052A |
| Number of Bits | 2 |
| Number of Data/Clock Inputs | 2 |
| Number of Functions | 2 |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.16mA |
| Propagation Delay (tpd) | 315ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 4.5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How is the pulse width of the CD54HC221F3A determined and what RC component range is typically used?
The output pulse width of the CD54HC221F3A is set by an external resistor and capacitor connected to the REXT/CEXT pins, following the relationship t = K × R × C where K is approximately 0.7 for HC-family monostables. Resistor values from 5 kohm to 100 Mohm and capacitor values from 10 pF to 100 µF can be used, enabling pulse widths spanning nanoseconds to tens of seconds at supply voltages from 2 V to 6 V.
What does non-retriggerable operation mean for the CD54HC221F3A in a digital control circuit?
Non-retriggerable means that once the CD54HC221F3A output pulse begins timing, additional trigger pulses during the timing interval are ignored and do not extend the output pulse. The output remains HIGH for the RC-determined period regardless of subsequent trigger edges, producing a fixed-duration pulse useful for generating precise strobe signals and timeout pulses in embedded control applications at 2 V to 6 V supply.
What output drive capability does the CD54HC221F3A provide for logic-level loads in a ceramic-packaged design?
Each monostable output of the CD54HC221F3A can sink up to 5.2 mA and source a similar current into a 50 pF capacitive load. This drive level is sufficient to directly interface with HC and AHC-family logic gate inputs and short trace lengths up to approximately 10 cm at 5 V supply, covering most internal board-level interconnect requirements in 16-pin ceramic GDIP military circuit designs.
When should the CD54HC221F3A be chosen over a 74HC221 in a procurement for avionics equipment?
The CD54HC221F3A should be specified for avionics when the design requires operation from -55°C to +125°C with a hermetic ceramic package (GDIP-16) that meets MIL-spec moisture and shock resistance requirements, as opposed to the commercial 74HC221 which is rated only from 0°C to +70°C in a plastic package. Defense procurement standards for DO-254 or MIL-PRF-38535 compliance require the CD54 military prefix and ceramic hermetic construction.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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