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Texas Instruments CY74FCT574TQCT
- Part No.:
- CY74FCT574TQCT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT574TQCT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,413
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Product details
Overview
CY74FCT574TQCT 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 common buffered clock (CP), output-enable (OE) control, 64-mA sink / 32-mA source drive strength, and Ioff partial-power-down support. Used in data latching and bus isolation within industrial control backplanes and legacy TTL-compatible logic interfaces.
For engineers reviewing the CY74FCT574TQCT datasheet, CY74FCT574TQCT pinout, CY74FCT574TQCT application, or CY74FCT574TQCT equivalent, key selection criteria include its 10 ns maximum propagation delay (tPLH/tPHL), flow-through pinout simplifying PCB routing, ±1 µA input leakage at VCC = 5.25 V, and compatibility with TTL-level inputs and outputs across –40°C to +85°C operation.
Technical Context
The CY74FCT574TQCT implements eight independent D-type flip-flops synchronized on the low-to-high transition of CP, with all outputs gated by a shared OE signal. Its Ioff circuitry disables outputs during power-down to prevent backflow current, and edge-rate control reduces switching noise.
It operates from 4.75 V to 5.25 V, supports TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max), and delivers rail-to-rail 3-state outputs with matched rise/fall times. The device is not a clock generator or oscillator - it is a synchronous storage element with combinatorial enable control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit positive-edge-triggered D-type register with 3-state outputs |
| Supply Voltage Range | 4.75 V to 5.25 V - ensures stable operation under industrial 5-V rail tolerances |
| Max Propagation Delay (CP→O) | 10 ns - enables reliable timing in 25-MHz+ synchronous buses |
| Output Drive Strength | 64 mA sink / 32 mA source - drives heavy capacitive loads and multiple TTL inputs |
| Ioff Support | Active at VCC = 0 V - prevents damaging current flow during hot-swap or partial power-down |
| Input Compatibility | Fully compatible with TTL logic levels - eliminates level-shifting in mixed-logic systems |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial handling robustness requirements |
Pinout & Package
Package: 20-pin QSOP (SSOP-DBQ), 0.154" body width, 0.65 mm pitch, 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 Data Inputs | Asynchronous parallel data inputs sampled on rising CP edge |
| 9 | GND | Ground reference for logic and power domains |
| 10 | VCC | Positive supply (4.75–5.25 V); powers internal logic and output drivers |
| 11–18 | O0–O7 3-State Outputs | Registered outputs enabled when OE = L; high-Z when OE = H |
| 19 | CP | Buffered clock input - triggers simultaneous capture of all D inputs on rising edge |
| 20 | OE | Active-low output-enable - controls bus contention without affecting internal register state |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input pins (D0–D7) on left side, output pins (O0–O7) on right side - minimizes trace crossovers and layer count in dense PCB layouts |
| Edge-rate controlled outputs | Controlled slew rate reduces simultaneous switching noise (SSN) and EMI in high-density digital systems |
| Matched rise/fall times | Ensures symmetrical timing margins and predictable setup/hold windows across temperature and voltage |
| TTL-compatible I/O | Accepts standard TTL VIH/VIL thresholds and drives TTL loads directly - no interface logic required |
| Partial-power-down Ioff | Outputs disabled at VCC = 0 V - enables safe insertion/removal in live backplane environments |
Applications
| Industrial Backplane Interface | Legacy System Bus Isolation |
|---|---|
Use Scenario: Latching sensor data from multiple analog-to-digital converters onto a shared 8-bit parallel bus in programmable logic controllers. IC Role / Device Role / Timing Role: Synchronous data register capturing parallel inputs on CP edge; OE used for bus arbitration between CPU and peripheral modules. Use Value: 10 ns tPLH and 1.5 ns tPZL ensure tight timing alignment with microcontroller strobes and eliminate bus contention during multi-master cycles. | Use Scenario: Isolating aging 8-bit microprocessor address/data buses from modern FPGA-based peripherals in retro-computing restoration projects. IC Role / Device Role / Timing Role: Bidirectional bus buffer with direction control replaced by OE gating; CP synchronizes legacy peripheral writes to FPGA memory-mapped registers. Use Value: TTL-compatible I/O and 64-mA sink capability drive long traces and vintage TTL loads without external buffers or level shifters. |
| Test Equipment Data Capture | Automated Test Fixture Control |
Use Scenario: Capturing parallel status bits from DUT (device under test) during functional validation in ATE systems. IC Role / Device Role / Timing Role: High-speed latch sampling DUT outputs at precise clock edges; 3-state outputs allow multiplexing multiple DUT channels onto a single acquisition bus. Use Value: 250-MHz typical switching rate and 2 ns minimum setup time support sub-10 ns sampling resolution in deterministic test sequences. | Use Scenario: Controlling 8-channel relay banks or LED indicators via microcontroller GPIO expansion in production line test fixtures. IC Role / Device Role / Timing Role: Output register holding steady-state control signals; OE used for safe power-up sequencing and fault-safe shutdown. Use Value: Ioff protection prevents backfeed into unpowered relay driver ICs during fixture maintenance, enhancing system safety and reliability. |
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 |
|---|---|---|---|
| CY74FCT374TQCT | Different pinout: inputs and outputs interleaved (not flow-through); identical electrical specs and function | Requires PCB layout revision due to non-flow-through pin assignment; same timing and drive capability | Select only if redesigning for space-constrained layouts where interleaved I/O improves routing density |
| SN74FCT574QCT | Same pinout and function; lower drive (32-mA sink / 12-mA source); 12 ns max tPLH | Suitable for lighter loads and lower-speed buses; higher noise immunity due to slower edge rates | Choose when driving ≤4 TTL loads per output and timing budget allows ≥12 ns propagation delay |
Compared with CY74FCT374TQCT, CY74FCT574TQCT's flow-through pinout reduces PCB layer count and signal skew; compared with SN74FCT574QCT, it delivers 2× stronger output drive and 2 ns faster propagation - critical for high-fanout or high-frequency bus applications.
Availability
CY74FCT574TQCT is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus isolation, automated test fixture control, and high-reliability data capture systems requiring stable component supply and long-term lifecycle support.
Supply support for CY74FCT574TQCT 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 for industrial, automotive, and communications markets.
The CY74FCT574TQCT belongs to TI's FCT logic family - engineered for high-speed, low-noise, TTL-compatible bus interfacing in mission-critical industrial and military-grade systems.
FAQ
What is the maximum clock frequency supported by CY74FCT574TQCT?
CY74FCT574TQCT supports a typical switching rate of 250 MHz, with guaranteed timing up to 100 MHz based on its 10 ns maximum propagation delay (tPLH/tPHL) and 2 ns setup time (tsu). For reliable operation at 100 MHz, ensure CP pulse width ≥7 ns and maintain clean power delivery with local decoupling.
Does CY74FCT574TQCT require external pull-up resistors on its 3-state outputs?
No, CY74FCT574TQCT does not require external pull-ups on its 3-state outputs. When OE is high, outputs enter high-impedance mode with leakage ≤±10 µA (IOZL/IOZH). Pull-ups are only needed if bus termination or default logic state is required in system-level design - not by the device itself.
Can CY74FCT574TQCT operate with a 3.3-V supply?
No, CY74FCT574TQCT is specified only for 4.75 V to 5.25 V operation. Its TTL-compatible inputs and output drive architecture require 5-V rails. For 3.3-V systems, consider TI's 74LVC574 or SN74AVC574 families, which are not drop-in replacements for CY74FCT574TQCT.
What is the purpose of the Ioff specification in CY74FCT574TQCT?
The Ioff specification in CY74FCT574TQCT defines the maximum leakage current (±1 µA) when VCC = 0 V and outputs are driven externally. This enables safe partial-power-down operation - for example, powering down the register while other bus components remain active - without risking reverse current damage to the device or upstream drivers.
How does the flow-through pinout of CY74FCT574TQCT improve PCB layout?
The flow-through pinout of CY74FCT574TQCT places D0–D7 on pins 1–8 (left side) and O0–O7 on pins 11–18 (right side), enabling straight-through trace routing from controller to peripheral. This eliminates layer jumps and vias between inputs and outputs, reducing signal skew, crosstalk, and layout complexity in high-density 8-bit bus designs.
CY74FCT574TQCT 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
CY74FCT574TQCT FAQ
1.How can I place an order for CY74FCT574TQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT574TQCT 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 CY74FCT574TQCT reliable?
The price and inventory of CY74FCT574TQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT574TQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT574TQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT574TQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT574TQCT?
CY74FCT574TQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT574TQCT 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 CY74FCT574TQCT?
For technical support, including CY74FCT574TQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT574TQCT requirements.
6.How does Aetrix verify that CY74FCT574TQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT574TQCT 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 CY74FCT574TQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT574TQCT?
All CY74FCT574TQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT574TQCT, 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 CY74FCT574TQCT part is unused and in its original packaging.
Return procedure for CY74FCT574TQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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