CD54HCT273F Texas Instruments Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
The CD54HCT273F is an octal D-type flip-flop with active-low reset in a 20-pin ceramic DIP package, operating at up to 16 MHz clock with TTL-compatible inputs for 5 V bus interfacing. Suited for military and high-reliability data bus latching applications with worldwide availability.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- CD54HCT273F Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $14.1359(MOQ 14)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD54HCT273F?
- Octal 8-bit D flip-flop with asynchronous master reset, capturing 8 data bits simultaneously on the positive clock edge
- HCT logic family with TTL-compatible inputs (VIH = 2.0 V) for direct interfacing to 74LS, 74F, and 74S bus drivers
- Ceramic 20-pin CDIP package rated for extended temperature ranges, suitable for military and high-reliability industrial applications
What is CD54HCT273F used for?
The CD54HCT273F is designed for 8-bit data bus latching in military-grade electronics, aerospace data acquisition systems, and high-reliability industrial controllers that require ceramic package construction for thermal stability and hermeticity. Its TTL-compatible inputs allow direct connection to legacy 8086 and Z80 processor bus interfaces without additional level translation. The octal configuration captures a full byte of data on a single clock edge, making it ideal for address latching and output port registers.
What are the specifications of CD54HCT273F?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Family | HCT |
| JESD-30 Code | R-GDIP-T20 |
| JESD-609 Code | e0 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | D FLIP-FLOP |
| Max Frequency@Nom-Sup | 16000000Hz |
| Max I(ol) | 0.004A |
| Number of Bits | 8 |
| Number of Functions | 8 |
| Output Polarity | TRUE |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.16mA |
| Prop. Delay@Nom-Sup | 45ns |
| Propagation Delay (tpd) | 45ns |
| Qualification Status | Not Qualified |
| Screening Level | 38535Q/M;38534H;883B |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 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 |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 16MHz |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Where can I find the CD54HCT273F datasheet?
CD54HCT273F Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD54HCT273F?
Compatible alternatives and drop-in replacements for CD54HCT273F:
D Flip-Flop, HCT Series, 8-Func, Positive Edge Triggered, 8-Bit, True Output, CMOS, CDIP20
Frequently Asked Questions
What maximum clock frequency does the CD54HCT273F support and which bus speeds does this cover?
The CD54HCT273F supports a maximum clock frequency of 16 MHz at 5 V with 50 pF load. This covers standard 8 MHz ISA bus, 10 MHz Z80 CPU, and 12 MHz 8051 microcontroller clock rates with margin. For faster 33 MHz or 66 MHz PCI bus applications, a faster ACT or FAST logic family flip-flop with 100–200 MHz rating would be required instead.
Why is the ceramic CDIP package of CD54HCT273F preferred over plastic PDIP in military and aerospace designs?
The ceramic CDIP package provides hermetic sealing, preventing moisture ingress that can cause corrosion and parametric drift over time. MIL-STD-883 qualification requires ceramic packaging for devices operating in humidity extremes from 0% to 100% RH over -55°C to +125°C. Plastic PDIP packages absorb moisture, causing popcorn cracking during soldering, which is unacceptable for flight-critical avionics or weapons system electronics.
How does the asynchronous active-low reset in CD54HCT273F differ from synchronous reset, and when is it essential?
The active-low master reset (MR) in CD54HCT273F clears all 8 flip-flop outputs to logic zero immediately without waiting for a clock edge. Asynchronous reset ensures the device reaches a known state within nanoseconds after power-on or fault detection, even before the system clock stabilizes. In safety-critical systems such as watchdog-triggered resets or power-fail logic, asynchronous clear guarantees deterministic initialization independent of clock availability.
How does CD54HCT273F's TTL-compatible input threshold make it interoperable with both TTL and CMOS driving sources?
The CD54HCT273F has VIH minimum of 2.0 V and VIL maximum of 0.8 V, matching the output swing of 74LS TTL which drives VOH minimum of only 2.4 V. Standard CMOS outputs driving 3.3 V logic high also exceed the 2.0 V VIH threshold, making the HCT device compatible with both 5 V TTL and 3.3 V CMOS driving sources without level shifters, simplifying mixed-technology board designs in retrofit and upgrade applications.
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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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| 17+ | $14.7105 | $250.08 |
| 22+ | $14.1359 | $310.99 |
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