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Texas Instruments CY74FCT273TQCT
- Part No.:
- CY74FCT273TQCT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT273TQCT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,483
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Product details
Overview
CY74FCT273TQCT from Texas Instruments is an 8-bit edge-triggered D-type flip-flop register with common clock (CP) and master-reset (MR) inputs, 64-mA sink / 32-mA source drive strength, 13-ns max propagation delay, and Ioff partial-power-down support - used in synchronous data latching for industrial control bus interfaces.
For engineers reviewing the CY74FCT273TQCT datasheet, CY74FCT273TQCT pinout, CY74FCT273TQCT application, or CY74FCT273TQCT equivalent, key selection criteria include TTL-compatible input thresholds, 5-V supply operation, SSOP-20 package thermal performance, and MR-synchronized reset behavior in noise-sensitive digital systems.
Technical Context
This device implements eight independent D-type flip-flops sharing a single buffered clock and active-low master reset, operating strictly on low-to-high CP transitions with 2-ns setup and 1.5-ns hold time requirements. All outputs are synchronized to the same clock edge and forced low when MR is asserted.
It features edge-rate control circuitry to reduce switching noise, matched rise/fall times for clean signal integrity, and Ioff protection enabling safe back-drive isolation during partial power-down. Input thresholds meet standard TTL levels (VIH = 2 V, VIL = 0.8 V), ensuring interoperability with legacy logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit positive-edge-triggered D-type register with synchronous reset |
| Supply Voltage | 4.75 V to 5.25 V - ensures stable 5-V TTL/CMOS interface compatibility |
| Output Drive | 64 mA sink / 32 mA source - supports heavy capacitive loads and fanout to multiple TTL inputs |
| Propagation Delay | 2 ns (min) to 13 ns (max) - enables reliable operation up to ~30 MHz system clock rates |
| Setup/Hold Time | 2 ns setup / 1.5 ns hold - defines minimum D-input stability window before CP rising edge |
| Ioff Support | Active at VCC = 0 V - prevents current backflow during partial power-down, protecting powered subsystems |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements |
Pinout & Package
Package: 20-pin QSOP (SSOP-20, DBQ), 3.9 mm × 8.7 mm body, 0.65 mm pitch, moisture sensitivity level 2 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | D0–D7 Data Inputs | Asynchronous parallel data inputs sampled on CP rising edge |
| 9 | GND | Power ground reference for all internal logic and output drivers |
| 10, 20 | VCC | 5-V supply pins - dual connection reduces IR drop and improves noise immunity |
| 11, 12, 13, 14, 15, 16, 17, 18 | Q0–Q7 Outputs | Registered complementary outputs - high-impedance not supported; outputs always driven |
| 19 | CP | Buffered clock input - triggers simultaneous latch of all D inputs on low-to-high transition |
| 20 | MR | Active-low master reset - forces all Q outputs low regardless of CP or D state |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) and EMI in dense PCB layouts |
| Matched rise/fall times | Minimizes duty cycle distortion in clock distribution and timing-critical paths |
| TTL-compatible input thresholds | Accepts standard 5-V TTL logic levels without level-shifting circuitry |
| Ioff partial-power-down protection | Disables outputs when VCC = 0 V, preventing back-current damage in mixed-supply systems |
| High noise immunity | 200-mV input hysteresis (Vhys) suppresses false triggering from rail noise |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Latching sensor status signals from analog-to-digital converters before transmission over CAN or LIN buses. IC Role / Device Role / Timing Role: Synchronous data capture register aligning asynchronous sensor reads to a centralized system clock. Use Value: Ensures deterministic sampling timing and eliminates metastability in multi-source digital inputs. | Use Scenario: Buffering switch inputs (door locks, window controls) prior to microcontroller polling. IC Role / Device Role / Timing Role: Input debouncing and synchronization stage isolating noisy mechanical contacts from MCU GPIO. Use Value: Reduces firmware interrupt load and eliminates software-based debounce delays in real-time safety functions. |
| Test Equipment Digital Pattern Generator | Legacy Bus Interface Adapter |
Use Scenario: Holding test vector data for parallel output to device-under-test (DUT) pins. IC Role / Device Role / Timing Role: Output staging register providing glitch-free, edge-aligned stimulus patterns. Use Value: Enables precise setup/hold margin control for high-speed digital validation without FPGA overhead. | Use Scenario: Interfacing modern microcontrollers to older ISA or VMEbus peripherals requiring TTL-level strobed data. IC Role / Device Role / Timing Role: Level-translating and timing-aligning bridge between 3.3-V MCU and 5-V legacy bus logic. Use Value: Eliminates need for discrete buffer arrays while maintaining strict tSU/tH compliance for bus arbitration cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT273QDR | Same 8-bit D-register function, identical pinout, but rated for –40°C to 85°C only and lacks Ioff support | Not suitable for partial-power-down systems; requires external isolation during VCC ramp-down | Select when cost sensitivity outweighs Ioff requirement and temperature range is limited |
| 74ACT273SCX | Higher drive (24 mA source / 24 mA sink), 3.3-V compatible inputs, no Ioff, 10-ns max tPD | Requires level translation for pure 5-V TTL environments; lower noise immunity due to CMOS input thresholds | Prefer for mixed-voltage designs where ACT family logic coexists and faster timing is critical |
Compared with SN74FCT273QDR and 74ACT273SCX, CY74FCT273TQCT uniquely combines industrial temperature range (–40°C to 85°C), Ioff-enabled power sequencing, and full TTL input compatibility - making it optimal for legacy-system upgrades requiring zero-layout change and robust power management.
Availability
CY74FCT273TQCT is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and test equipment digital pattern generation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY74FCT273TQCT 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The FCT logic family, including CY74FCT273TQCT, was designed for high-noise industrial and automotive environments requiring TTL compatibility, robust ESD tolerance, and seamless integration with legacy 5-V systems.
FAQ
What is the maximum clock frequency supported by CY74FCT273TQCT?
CY74FCT273TQCT has a maximum propagation delay of 13 ns and minimum pulse width of 6 ns on both CP and MR inputs. Based on these timing parameters, the device supports reliable operation up to approximately 30 MHz in typical 5-V systems with proper layout and load management. Actual usable frequency depends on board-level signal integrity, capacitive loading, and setup/hold margin adherence - CY74FCT273TQCT is not characterized for guaranteed operation above 30 MHz.
Does CY74FCT273TQCT support 3.3-V logic inputs?
No, CY74FCT273TQCT does not support direct 3.3-V logic inputs. Its input thresholds are specified for TTL compatibility: VIH = 2.0 V (min) and VIL = 0.8 V (max) at VCC = 5 V. While a 3.3-V high signal may exceed VIH in many cases, it falls outside guaranteed operational range per datasheet specifications. For reliable 3.3-V interfacing, level-shifting circuitry or a 3.3-V–compatible alternative like 74LVC273 should be used alongside CY74FCT273TQCT.
Can CY74FCT273TQCT outputs drive LEDs directly?
Yes, CY74FCT273TQCT outputs can drive LEDs directly in sink configuration: each output provides up to 64 mA sink current, sufficient for standard indicator LEDs with appropriate series resistors. For example, with VCC = 5 V and LED forward voltage ~2 V, a 47 Ω resistor limits current to ~64 mA. However, sustained 64-mA operation across multiple outputs increases total ICC and thermal load - derating is recommended for continuous-duty applications. CY74FCT273TQCT does not support high-side (source) LED driving above 32 mA per pin.
Is CY74FCT273TQCT pin-compatible with CY54FCT273T?
No, CY74FCT273TQCT is not pin-compatible with CY54FCT273T. CY74FCT273TQCT uses a 20-pin QSOP (DBQ) package, while CY54FCT273T is specified for D- or L-package variants (SOIC-20 and LCCC-20). Although both share identical logic functionality and pin numbering convention (e.g., Pin 1 = D0, Pin 19 = CP), physical land patterns, thermal pads, and mounting dimensions differ. Board redesign is required to substitute CY74FCT273TQCT for CY54FCT273T or vice versa.
What is the purpose of the Ioff feature in CY74FCT273TQCT?
The Ioff feature in CY74FCT273TQCT disables all outputs when VCC = 0 V, preventing damaging current backflow from powered system traces into the unpowered IC. This enables safe partial-power-down operation - for example, when CY74FCT273TQCT resides on a peripheral board that loses power while host logic remains active. Ioff ensures no reverse current exceeds ±1 µA per pin, protecting both CY74FCT273TQCT and upstream drivers during power sequencing events.
CY74FCT273TQCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
- Max Propagation Delay @ V, Max CL:
- 13ns @ 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Iq):
- 200 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
CY74FCT273TQCT FAQ
1.How can I place an order for CY74FCT273TQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT273TQCT 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 CY74FCT273TQCT reliable?
The price and inventory of CY74FCT273TQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT273TQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT273TQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT273TQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT273TQCT?
CY74FCT273TQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT273TQCT 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 CY74FCT273TQCT?
For technical support, including CY74FCT273TQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT273TQCT requirements.
6.How does Aetrix verify that CY74FCT273TQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT273TQCT 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 CY74FCT273TQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT273TQCT?
All CY74FCT273TQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT273TQCT, 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 CY74FCT273TQCT part is unused and in its original packaging.
Return procedure for CY74FCT273TQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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