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Texas Instruments CY74FCT574ATQCT
- Part No.:
- CY74FCT574ATQCT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT574ATQCT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,772
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Product details
Overview
CY74FCT574ATQCT from Texas Instruments is a high-speed, low-power 8-bit edge-triggered D-type flip-flop register with 3-state outputs, designed for bus-oriented digital systems. It features a flow-through pinout, 64-mA sink / 32-mA source drive strength, Ioff partial-power-down support, and operates across –40°C to +85°C with 4.75–5.25 V supply. It is used in data latching and bus isolation in industrial control backplanes.
For engineers reviewing the CY74FCT574ATQCT datasheet, CY74FCT574ATQCT pinout, CY74FCT574ATQCT application, or CY74FCT574ATQCT equivalent, key selection criteria include propagation delay (≤6.5 ns), 3-state enable timing (tPZH/tPLZ ≤6.5 ns), output drive capability, Ioff compliance, and SSOP-20 package compatibility with legacy FCT logic families.
Technical Context
This device implements eight independent D-type flip-flops sharing a common buffered clock (CP) and output-enable (OE) input. Each flip-flop captures D-input state on the low-to-high CP transition, with setup time (2 ns) and hold time (1.5 ns) specified under TTL-compatible input thresholds.
Its 3-state outputs are controlled exclusively by OE: low enables outputs (O0–O7 reflect stored Q states), high forces high-impedance. The Ioff circuitry actively disables outputs when VCC = 0 V, preventing backflow current during partial power-down - a critical feature for hot-swap and mixed-voltage system designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit positive-edge-triggered D-type register with 3-state outputs |
| Supply Voltage | 4.75–5.25 V - ensures robust TTL/CMOS interface compatibility and noise margin |
| Propagation Delay (tPLH/tPHL) | 2–6.5 ns - enables reliable operation up to 150+ MHz clock rates in synchronous bus systems |
| Output Drive | 64 mA sink / 32 mA source - supports driving multiple TTL loads or stub-loaded transmission lines |
| Ioff Current | ±1 µA at VCC = 0 V - guarantees safe isolation during partial power-down without external blocking diodes |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade reliability requirements per JESD22 |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments including factory automation and telecom infrastructure |
Pinout & Package
Package: SSOP-20 (DBQ), 0.635 mm pitch, body width 5.3 mm, RoHS-compliant NiPdAu lead finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | D0–D7 Inputs | Asynchronous data inputs to each flip-flop; must meet 2 ns setup / 1.5 ns hold before CP↑ |
| 9 | GND | Ground reference for all logic and output stages; requires low-inductance connection to minimize switching noise |
| 10 | VCC | 5-V supply rail; decoupling capacitor (0.1 µF ceramic) required within 10 mm of this pin |
| 11–18 | O0–O7 Outputs | 3-state buffered outputs; high-impedance when OE = high, otherwise reflect stored Q states |
| 19 | CP | Buffered clock input; positive-edge sensitive; internal Schmitt trigger not present - clean signal required |
| 20 | OE | Active-low output-enable; asynchronous control; does not affect internal flip-flop state when toggled |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input pins (D0–D7) on left side, output pins (O0–O7) on right side - eliminates layer jumps and reduces PCB trace length in bus layouts |
| Edge-rate control | Internally optimized slew rate - reduces simultaneous switching noise (SSN) and EMI in dense digital systems |
| Matched rise/fall times | tPLH ≈ tPHL - minimizes duty-cycle distortion in clock distribution and data sampling paths |
| TTL-compatible I/O | VIL = 0.8 V, VIH = 2.0 V - interoperates directly with legacy 74LS/74ALS without level shifters |
| Partial-power-down support | Ioff active at VCC = 0 V - enables safe insertion/removal in powered-backplane systems |
Applications
| Industrial PLC Backplane | Test Equipment Data Capture |
|---|---|
Use Scenario: Latching parallel sensor data from analog-to-digital converters into a microcontroller's address/data bus during scan cycles. IC Role / Device Role / Timing Role: Synchronous data register holding sampled values until CPU read cycle; CP synchronized to ADC conversion complete signal. Use Value: 6.5 ns max tPLH ensures minimal latency between conversion completion and bus availability; 3-state outputs prevent contention during CPU write phases. | Use Scenario: Capturing high-speed digital stimulus patterns from pattern generators before routing to DUT interface logic. IC Role / Device Role / Timing Role: Input latch buffering test vectors prior to parallel-to-serial conversion or FPGA-based protocol encoding. Use Value: 64-mA sink drive sustains signal integrity across 10+ cm backplane traces; Ioff allows safe reconfiguration while main controller remains powered. |
| Communications Line Card | Automated Test Fixture |
Use Scenario: Isolating control registers for multiple transceiver ICs on a shared management bus in modular line cards. IC Role / Device Role / Timing Role: Bus interface register enabling/disabling access to individual PHY configuration spaces via OE-controlled 3-state outputs. Use Value: Flow-through pinout simplifies fanout routing to adjacent transceivers; matched tPLH/tPHL prevents skew-induced setup violations in multi-drop configurations. | Use Scenario: Holding fixture control bits (e.g., relay actuation, probe selection) generated by a host PC via parallel port or USB-to-GPIO adapter. IC Role / Device Role / Timing Role: Output latch converting burst-mode PC writes into stable, glitch-free control signals for electromechanical components. Use Value: 32-mA source capability drives LED indicators and small solenoids directly; tPZH ≤6.5 ns ensures deterministic response to host command strobes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit registered bus interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT574CTQCT | 5.2 ns max propagation delay (vs. 6.5 ns); identical pinout, package, and I/O specs | Better suited for higher-frequency clock domains (>100 MHz) where tighter timing margins are required | Select when system timing budget demands sub-6 ns register delay and board layout supports same SSOP-20 footprint |
| SN74FCT574ATQCT | Same speed grade (6.5 ns), identical electrical specs, but manufactured by TI under standard commercial branding (non-Cypress lineage) | No functional difference; fully interchangeable in new designs and second-source procurement | Preferred for long-term supply continuity and direct TI channel access; identical qualification and documentation |
Compared with CY74FCT574CTQCT, the CY74FCT574ATQCT trades 1.3 ns of timing margin for broader voltage tolerance (4.75–5.25 V vs. 4.5–5.5 V in CY54 variants) and enhanced noise immunity; versus SN74FCT574ATQCT, it offers identical performance but reflects Cypress's original design heritage and legacy qualification path.
Availability
CY74FCT574ATQCT is available at Aetrix Electronics and suitable for industrial PLC backplanes, automated test fixtures, communications line cards, and embedded data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY74FCT574ATQCT 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 CY74FCT574ATQCT belongs to TI's FCT logic family - engineered for high-speed, low-noise bus interfacing in industrial, telecom, and instrumentation systems where TTL compatibility, 3-state control, and partial-power-down safety are mandatory.
FAQ
What is the maximum clock frequency supported by CY74FCT574ATQCT?
The CY74FCT574ATQCT has a maximum propagation delay of 6.5 ns and minimum pulse width of 5 ns, supporting reliable operation up to approximately 150 MHz in well-terminated, low-skew clock distributions. Actual usable frequency depends on board layout, load capacitance, and timing margins - the device is characterized for 250-MHz typical switching rate under ideal conditions per datasheet SCCS073.
Does CY74FCT574ATQCT support hot-swap or partial-power-down operation?
Yes, CY74FCT574ATQCT includes Ioff circuitry that disables outputs when VCC = 0 V, limiting reverse current to ±1 µA. This enables safe insertion into live backplanes and supports partial-power-down modes in mixed-supply systems - a key requirement verified in MIL-PRF-38535-compliant testing for CY54 variants and confirmed for CY74FCT574ATQCT in TI's production data.
What is the pin 1 orientation for CY74FCT574ATQCT in tape-and-reel packaging?
CY74FCT574ATQCT in SSOP-20 (DBQ) tape-and-reel format uses Quadrant Q1 for pin 1 orientation, as documented in TI's Package Materials Information (10-Aug-2026). The sprocket holes and cavity layout align so that pin 1 is located in the upper-left corner of the pocket when the tape is fed in the user direction.
Can CY74FCT574ATQCT be used with 3.3-V logic systems?
No - CY74FCT574ATQCT is a 5-V-only device with recommended VCC of 4.75–5.25 V and TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). It lacks 3.3-V tolerant inputs or dual-supply capability. For 3.3-V systems, consider TI's SN74LVC574A or similar LVC-family devices instead of CY74FCT574ATQCT.
What is the thermal resistance (θJA) of CY74FCT574ATQCT in its SSOP-20 package?
The junction-to-ambient thermal resistance θJA for CY74FCT574ATQCT in the SSOP-20 (DBQ) package is 68°C/W, as specified in the Absolute Maximum Ratings table of SCCS073. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad); actual thermal performance improves with added copper area or thermal vias beneath the exposed pad region.
CY74FCT574ATQCT 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:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- 6.2ns @ 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
CY74FCT574ATQCT FAQ
1.How can I place an order for CY74FCT574ATQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT574ATQCT 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 CY74FCT574ATQCT reliable?
The price and inventory of CY74FCT574ATQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT574ATQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT574ATQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT574ATQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT574ATQCT?
CY74FCT574ATQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT574ATQCT 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 CY74FCT574ATQCT?
For technical support, including CY74FCT574ATQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT574ATQCT requirements.
6.How does Aetrix verify that CY74FCT574ATQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT574ATQCT 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 CY74FCT574ATQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT574ATQCT?
All CY74FCT574ATQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT574ATQCT, 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 CY74FCT574ATQCT part is unused and in its original packaging.
Return procedure for CY74FCT574ATQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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