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Texas Instruments CD74FCT273M
- Part No.:
- CD74FCT273M
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74FCT273M.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:835
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Product details
Overview
CD74FCT273M 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 8-bit positive-edge-triggered latching, direct active-low CLR, 48-mA sink capability per output, 70-MHz maximum clock frequency, and output voltage swing limited to 3.7 V for EMI reduction - used in buffer/shift register implementations in industrial control logic.
For engineers reviewing the CD74FCT273M datasheet, CD74FCT273M pinout, CD74FCT273M application, or CD74FCT273M equivalent, this page delivers verified functional identity, validated SOIC-20 package mapping, confirmed timing and drive specifications, and real-world use context for register-level design decisions.
Technical Context
The CD74FCT273M implements eight independent D-type flip-flops sharing a common CLK and active-low CLR input, operating on the rising edge of CLK only. Its BiCMOS output stage combines bipolar pull-down and CMOS pull-up transistors to limit VOH to ~3.7 V at VCC = 5 V, reducing ground/VCC bounce during simultaneous switching.
It supports TTL-level input thresholds (VIH = 2 V, VIL = 0.8 V), requires 3 ns data setup and 2 ns hold time relative to CLK↑, and delivers propagation delays as low as 2 ns (tpd) under CL = 50 pF. All inputs are buffered, and the device is SCR latch-up resistant per JEDEC JESD78.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | FCT BiCMOS - enables 5-V TTL compatibility with CMOS power efficiency and bipolar speed |
| Max Clock Frequency | 70 MHz - supports high-throughput data capture in synchronous bus interfaces |
| Output Sink Current | 48 mA per pin - drives multiple TTL loads or LED indicators without external buffers |
| Output Voltage Swing | 0 V to 3.7 V (VOH ≤ VCC – 1.3 V) - suppresses power-bus ringing and EMI in dense PCB layouts |
| Propagation Delay | 2–13 ns (tpd, CL = 50 pF) - ensures predictable timing margins in pipeline and register-transfer logic |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded control and instrumentation |
| Supply Voltage Range | 4.75 V to 5.25 V - tight regulation tolerance prevents false triggering in noisy 5-V rails |
Pinout & Package
CD74FCT273M is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.8 mm long, 2.65 mm max height, with 1.27 mm pitch gull-wing leads. Pin 1 is marked by a beveled corner or notch; the package is RoHS-compliant and rated MSL N/A (non-moisture-sensitive).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLR) | Asynchronous Reset Input | Active-low global reset - forces all Q outputs low regardless of CLK state; requires ≥4 ns setup before CLK↑ |
| 2–9, 11–18 (1D–8D, 1Q–8Q) | Data Inputs / Q Outputs | Eight independent D/Q pairs - each transfers D to Q on CLK↑; outputs are non-inverting and TTL-compatible |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output current; must be low-impedance for noise immunity |
| 19 (CLK) | Clock Input | Positive-edge-triggered master clock - sampling occurs at defined voltage threshold, not edge slope |
| 20 (VCC) | Power Supply | +5 V supply - powers BiCMOS core; decoupling capacitor required within 1 cm for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Output Stage | Limits VOH to 3.7 V at 5 V supply - reduces simultaneous switching noise and improves signal integrity in multi-load buses |
| 48-mA Sink Capability | Drives up to 10 standard TTL inputs or discrete LEDs directly - eliminates need for external driver stages |
| Buffered Inputs | Reduces capacitive loading and input current leakage - maintains timing predictability across temperature and voltage |
| SCR Latch-Up Resistance | Qualified per JEDEC JESD78 Class II - ensures robust operation in electrically noisy industrial environments |
| Controlled Edge Rates | Minimizes overshoot/ringing on PCB traces - supports reliable routing without termination resistors in short-run interconnects |
Applications
| Buffer/Storage Registers | Shift Registers |
|---|---|
Use Scenario: Holding parallel data from microcontroller GPIO or ADC interface prior to serial transmission or processing. IC Role / Device Role / Timing Role: Synchronous 8-bit data latch - captures and holds byte-wide signals on CLK↑ with deterministic setup/hold timing. Use Value: Enables clean separation between acquisition and processing phases; 70-MHz clock support allows real-time buffering in high-sample-rate systems. | Use Scenario: Constructing serial-out shift registers for LED matrix scanning or SPI peripheral expansion. IC Role / Device Role / Timing Role: Cascadable D-flip-flop stage - Qn connects to Dn+1, with shared CLK/CLR enabling synchronized bit-shifting. Use Value: Eliminates need for dedicated shift-register ICs; BiCMOS drive strength sustains signal integrity across 3–5 cascaded stages. |
| Pattern Generators | Industrial Control Logic |
Use Scenario: Generating fixed timing sequences for stepper motor control, PWM waveform synthesis, or test signal generation. IC Role / Device Role / Timing Role: Deterministic state-holding element - preloaded via D inputs, advanced synchronously to produce repeatable output patterns. Use Value: 2–13 ns propagation delay and 3 ns setup enable sub-15 ns minimum pattern step resolution at 5 V. | Use Scenario: Implementing safety-critical status latching in PLC I/O modules or sensor fault detection circuits. IC Role / Device Role / Timing Role: Asynchronous reset-controlled register - CLR forces known safe state (all Q = low) during power-up or fault condition. Use Value: Guaranteed low-output reset behavior independent of clock state meets IEC 61508 functional safety initialization requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F273N | Bipolar TTL (not BiCMOS); higher ICC (120 mA typical), lower IOL (20 mA), no VOH limiting | Higher power consumption and EMI; unsuitable for noise-sensitive or high-drive applications | Choose only if legacy TTL system compatibility is mandatory and drive/load requirements are minimal |
| 74AC273PC | Advanced CMOS; wider VCC range (2–6 V), lower ICC (4 µA), but IOL = 24 mA and no VOH clamping | Lower power but reduced drive strength and no EMI-suppressing output swing limitation | Select when operating below 5 V or ultra-low static power is critical, and EMI control is handled elsewhere |
Compared with SN74F273N and 74AC273PC, CD74FCT273M uniquely balances 48-mA drive, 3.7-V VOH clamping, and 70-MHz speed - making it optimal for 5-V industrial register applications where EMI, load driving, and timing precision are jointly constrained.
Availability
CD74FCT273M is available at Aetrix Electronics and suitable for industrial control logic, buffer/shift register implementation, and pattern generator designs requiring stable component supply and long-term obsolescence management.
Supply support for CD74FCT273M 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The CD74FCT273M belongs to TI's FCT logic family - engineered for 5-V TTL-compatible operation with BiCMOS speed/power optimization, targeting high-reliability register and storage functions in commercial-temperature systems.
FAQ
What is the function of the CLR pin on the CD74FCT273M?
The CLR (Clear) pin on the CD74FCT273M is an asynchronous, active-low input that forces all eight Q outputs to logic low immediately, regardless of the CLK state or timing. This override function operates independently of the clock edge and is essential for system initialization or fault recovery. The CD74FCT273M requires a minimum 4 ns setup time for CLR relative to the next CLK↑ to ensure reliable reset assertion.
Does the CD74FCT273M support 3.3-V operation?
No, the CD74FCT273M is specified only for 4.75 V to 5.25 V supply operation and is not rated for 3.3-V use. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and BiCMOS output structure are optimized for 5-V TTL compatibility. Attempting to operate the CD74FCT273M at 3.3 V may result in undefined logic states, insufficient noise margin, or failure to meet timing specifications.
What is the significance of the 3.7-V output voltage limit in the CD74FCT273M?
The CD74FCT273M limits VOH to approximately 3.7 V (VCC – 1.3 V) via its BiCMOS output stage, which intentionally caps the high-level output swing. This design reduces power-bus ringing and minimizes VCC/ground bounce during simultaneous output switching - directly lowering electromagnetic interference (EMI) in densely routed PCBs. The CD74FCT273M achieves this without external components, enhancing signal integrity in noise-sensitive applications.
Can the CD74FCT273M drive standard TTL loads directly?
Yes, the CD74FCT273M can drive up to 10 standard TTL unit loads (each ≈ 1.6 mA) per output due to its 48-mA sink capability and compatible VOH/VOL levels (VOH ≥ 2.4 V, VOL ≤ 0.55 V at IOL = 48 mA). Its TTL-compatible input thresholds and 5-V supply alignment ensure seamless interfacing with legacy 74LS/74ALS devices. The CD74FCT273M eliminates level-shifting requirements in mixed-logic 5-V systems.
Is the CD74FCT273M pin-compatible with other 20-pin octal D-flip-flops like the 74LS273?
Yes, the CD74FCT273M shares identical pinout and functional assignment with industry-standard 20-pin octal D-flip-flops including the 74LS273 and SN74F273N - supporting direct replacement in existing SOIC-20 footprints. However, differences in drive strength, timing, and output voltage swing mean layout reuse is possible, but timing analysis and noise evaluation must be repeated when substituting the CD74FCT273M into LS/F-series designs.
CD74FCT273M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 10 pF
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74FCT273M FAQ
1.How can I place an order for CD74FCT273M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74FCT273M 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 CD74FCT273M reliable?
The price and inventory of CD74FCT273M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74FCT273M is usually 5 days.
3.What payment methods are accepted for CD74FCT273M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74FCT273M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74FCT273M?
CD74FCT273M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74FCT273M 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 CD74FCT273M?
For technical support, including CD74FCT273M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74FCT273M requirements.
6.How does Aetrix verify that CD74FCT273M is sourced from the original manufacturer or authorized distributors?
All CD74FCT273M 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 CD74FCT273M meets industry standards.
7.What is the process for return or replacement of CD74FCT273M?
All CD74FCT273M units undergo pre-shipment inspection (PSI). If there is an issue with CD74FCT273M, 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 CD74FCT273M part is unused and in its original packaging.
Return procedure for CD74FCT273M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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