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Texas Instruments CD74FCT273E
- Part No.:
- CD74FCT273E
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74FCT273E.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:758
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Product details
Overview
CD74FCT273E from Texas Instruments is a BiCMOS octal D-type flip-flop with asynchronous reset, designed for high-speed digital storage and synchronization in 5-V TTL-compatible systems. It features positive-edge clock triggering, 48-mA output sink capability, 3.7-V limited output swing to suppress EMI, and operation across 0°C to 70°C. Used in buffer/shift registers and pattern generators where deterministic timing and noise control are critical.
For engineers reviewing the CD74FCT273E datasheet, CD74FCT273E pinout, CD74FCT273E application, or CD74FCT273E equivalent, this page delivers verified electrical specs, package mapping, functional role in synchronous logic, and validated alternatives - all grounded in TI's SCBS737A production data sheet.
Technical Context
The CD74FCT273E implements eight independent D-type flip-flops sharing one common clock (CLK) and one active-low asynchronous clear (CLR), enabling simultaneous register reset without clock dependency. Its BiCMOS output stage combines bipolar speed with CMOS input characteristics, limiting VOH to ~3.7 V (two diode drops below VCC) to reduce ground/VCC bounce during parallel switching.
Timing is defined by strict setup (3 ns) and hold (2 ns) requirements relative to CLK↑, with guaranteed 70-MHz maximum clock frequency and propagation delays of 2–13 ns (tpd). Input isolation from VCC and SCR latch-up resistance ensure robust operation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - Ensures compatibility with standard 5-V TTL logic rails and stable operation under ±5% regulation. |
| Max Clock Frequency | 70 MHz - Supports high-throughput data latching in fast control and communication interfaces. |
| Output Sink Current | 48 mA per pin - Drives multiple TTL loads or low-impedance buses without external buffering. |
| Output Voltage Swing | 0 V to 3.7 V - Reduces power-bus ringing and EMI by clamping VOH below full VCC. |
| Propagation Delay | 2–13 ns (CL = 50 pF) - Enables precise timing alignment in synchronous state machines and pipeline stages. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded and industrial control applications. |
| Input Capacitance | 10 pF - Minimizes loading on preceding drivers and preserves signal integrity at high frequencies. |
Pinout & Package
CD74FCT273E uses a 20-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard 0.1"-grid protoboards and PCB footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Active-low asynchronous reset - forces all Q outputs low regardless of CLK state. |
| 2–9 | 1Q–8Q | Registered outputs - reflect D-input values sampled on prior CLK↑ edge. |
| 10 | GND | Ground reference - return path for all internal logic and output currents. |
| 11 | VCC | Positive supply - powers BiCMOS core; output VOH clamped to ~3.7 V. |
| 12–19 | 1D–8D | Data inputs - sampled on CLK↑; require ≥3 ns setup and ≥2 ns hold time. |
| 20 | CLK | Positive-edge-triggered clock - controls simultaneous latching of all eight D inputs. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Combines bipolar speed and CMOS input impedance for low quiescent current (<80 µA) and 48-mA drive strength. |
| Controlled output edge rates | Reduces simultaneous switching noise (SSN) and EMI generation during bus transitions. |
| Input/output isolation from VCC | Prevents supply coupling between input logic and output switching transients. |
| SCR latch-up resistance | Guarantees immunity to transient-induced parasitic thyristor conduction in noisy environments. |
| Buffered inputs | Enables fan-out to multiple downstream devices without signal degradation or timing skew. |
Applications
| Buffer/Storage Registers | Shift Registers |
|---|---|
Use Scenario: Holding parallel data from an ADC or microcontroller bus before serial transmission or processing. IC Role / Device Role / Timing Role: Synchronous data latch - captures and holds 8-bit words on CLK↑ with deterministic setup/hold margins. Use Value: Eliminates metastability risk via controlled BiCMOS timing and ensures clean, bounce-free bus driving at up to 70 MHz. | Use Scenario: Constructing 8-bit serial-in/parallel-out (SIPO) or parallel-in/serial-out (PISO) shift paths in protocol engines. IC Role / Device Role / Timing Role: Cascadable register stage - CLK and CLR shared across multiple CD74FCT273E units to enable synchronized bit-shifting. Use Value: 48-mA sink capability supports direct connection to LED arrays or termination resistors without added drivers. |
| Pattern Generators | Digital Control Sequencers |
Use Scenario: Generating fixed test vectors or waveform sequences for FPGA validation or board-level diagnostics. IC Role / Device Role / Timing Role: Deterministic state holder - outputs reflect preloaded D-values after each CLK↑, enabling repeatable timing patterns. Use Value: 3.7-V VOH limit reduces ground bounce during multi-output toggling, improving pattern fidelity in mixed-signal test setups. | Use Scenario: Managing enable/disable states of power supplies, relays, or peripheral ICs in programmable logic controllers. IC Role / Device Role / Timing Role: Synchronized control register - CLR allows immediate system-wide reset of all control outputs independent of clock phase. Use Value: Asynchronous reset guarantees known initial state at power-up or fault recovery, meeting IEC 61508 functional safety timing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F273N | F-series TTL implementation - higher ICC (120 mA typical), no BiCMOS output clamping, VOH ≈ VCC – 0.8 V. | Lacks EMI-reducing output voltage limiting; less suitable for dense, high-speed boards with strict EMC requirements. | Choose SN74F273N only if legacy TTL compatibility and higher VOH are required; verify layout for increased ground bounce. |
| 74AC273PC | Advanced CMOS - lower ICC (2 µA), rail-to-rail VOH, but only 24-mA sink capability and no BiCMOS noise suppression. | Better for ultra-low-power systems but insufficient drive strength for heavy bus loading or LED driving. | Select 74AC273PC when power budget is primary constraint and load current ≤24 mA; avoid in EMI-sensitive or high-drive scenarios. |
Compared with SN74F273N and 74AC273PC, the CD74FCT273E uniquely balances 48-mA drive, 3.7-V EMI-suppressing VOH, and BiCMOS speed/power trade-off - making it optimal for industrial control registers where noise, drive, and timing coexist as hard constraints.
Availability
CD74FCT273E is available at Aetrix Electronics and suitable for buffer/shift registers, pattern generators, digital sequencers, and industrial control logic requiring stable component supply across extended product lifecycles.
Supply support for CD74FCT273E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of expertise in high-reliability logic families and industrial-grade qualification.
The CD74FCT273E belongs to TI's FCT (Fast CMOS Technology) logic series - engineered for 5-V systems needing TTL-compatible speed, BiCMOS efficiency, and robust noise immunity in commercial-temperature applications.
FAQ
What is the maximum clock frequency supported by the CD74FCT273E?
The CD74FCT273E supports a maximum clock frequency of 70 MHz under recommended operating conditions (VCC = 4.75 V to 5.25 V, TA = 0°C to 70°C, CL = 50 pF). This rating is guaranteed by TI's SCBS737A datasheet and reflects worst-case propagation delay (tpd ≤ 13 ns) across all eight flip-flops. The CD74FCT273E achieves this performance using BiCMOS circuitry that combines bipolar switching speed with CMOS input efficiency.
Does the CD74FCT273E have true 5-V output swing, or is it limited?
The CD74FCT273E does not provide full 5-V output swing: its VOH is limited to approximately 3.7 V (two diode drops below VCC) due to its BiCMOS output stage design. This intentional limitation reduces power-bus ringing and ground/VCC bounce during simultaneous output switching - a key EMI mitigation feature confirmed in TI's SCBS737A datasheet. The CD74FCT273E maintains VOL ≤ 0.55 V at 48-mA sink current.
Can the CD74FCT273E be used in place of the SN74F273N without layout changes?
No - while the CD74FCT273E and SN74F273N share identical PDIP-20 pinout and logic function, they differ electrically: the CD74FCT273E has BiCMOS output clamping (VOH ≈ 3.7 V), lower ICC, and improved noise immunity, whereas the SN74F273N uses standard TTL outputs (VOH ≈ 3.4 V, higher ICC). System-level validation of timing margins, bus loading, and EMI behavior is required before substitution. The CD74FCT273E is not a drop-in replacement without analysis.
What is the purpose of the "buffered inputs" specification for the CD74FCT273E?
Buffered inputs in the CD74FCT273E refer to internal input-stage amplification that isolates the external signal node from internal capacitance and switching transients. This design improves noise rejection, enables reliable fan-out to multiple downstream loads, and stabilizes setup/hold timing margins - especially critical given the CD74FCT273E's 3 ns setup requirement. TI's SCBS737A datasheet confirms buffered inputs as a core BiCMOS advantage over unbuffered logic families.
Is the CD74FCT273E suitable for automotive applications?
The CD74FCT273E is characterized for 0°C to 70°C operation and is not qualified to AEC-Q100 automotive standards. Its datasheet specifies commercial temperature range only, and TI lists it under general-purpose logic - not automotive-grade variants. For automotive use, designers must select AEC-Q100-qualified equivalents (e.g., CD74HC273-Q1) or perform full qualification testing. The CD74FCT273E remains appropriate for industrial, computing, and communications equipment within its rated temperature envelope.
CD74FCT273E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 70 MHz
- Max Propagation Delay @ V, Max CL:
- 7ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 48mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74FCT273E FAQ
1.How can I place an order for CD74FCT273E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74FCT273E on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CD74FCT273E reliable?
The price and inventory of CD74FCT273E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74FCT273E is usually 5 days.
3.What payment methods are accepted for CD74FCT273E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74FCT273E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74FCT273E?
CD74FCT273E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74FCT273E order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CD74FCT273E?
For technical support, including CD74FCT273E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74FCT273E requirements.
6.How does Aetrix verify that CD74FCT273E is sourced from the original manufacturer or authorized distributors?
All CD74FCT273E products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD74FCT273E meets industry standards.
7.What is the process for return or replacement of CD74FCT273E?
All CD74FCT273E units undergo pre-shipment inspection (PSI). If there is an issue with CD74FCT273E, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CD74FCT273E part is unused and in its original packaging.
Return procedure for CD74FCT273E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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