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Texas Instruments CY74FCT574ATSOC
- Part No.:
- CY74FCT574ATSOC
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT574ATSOC.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:655
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Product details
Overview
CY74FCT574ATSOC from Texas Instruments is an 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, ±32-mA output drive, 6.5-ns maximum propagation delay, and Ioff partial-power-down support - enabling use in hot-swap and mixed-voltage interface applications such as industrial PLC backplanes and legacy TTL-compatible data buses.
For engineers reviewing the CY74FCT574ATSOC datasheet, CY74FCT574ATSOC pinout, CY74FCT574ATSOC application, or CY74FCT574ATSOC equivalent, key selection criteria include its SOIC-20 package, 5-V operation with TTL-compatible inputs, 3-state bus isolation timing, and compatibility with FCT logic families in high-noise industrial environments.
Technical Context
The CY74FCT574ATSOC implements eight independent D-type latches synchronized to the low-to-high transition of CP, with all outputs gated by a single OE input. Its edge-rate-controlled outputs reduce switching noise, while matched rise/fall times ensure clean signal integrity on shared data buses.
It supports partial-power-down via Ioff circuitry that disables outputs when VCC = 0 V, preventing backflow current. The device operates across –40°C to +85°C and is fully compatible with TTL input thresholds (VIH = 2 V, VIL = 0.8 V) and 5-V CMOS output levels (VOH = 2.4 V min at –32 mA, VOL = 0.55 V max at 64 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Type | 8-bit positive-edge-triggered D-type register with 3-state outputs |
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation in noisy 5-V industrial rails |
| Propagation Delay (tPLH/tPHL) | 2 ns (min) to 6.5 ns (max) - enables reliable 150-MHz+ bus clocking |
| Output Drive | –32 mA source / +64 mA sink - drives heavy capacitive loads and multiple TTL inputs |
| Ioff Support | Active at VCC = 0 V - prevents backfeed during hot-insertion or power sequencing |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial ambient conditions |
Pinout & Package
Package: SOIC-20 (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1 (unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low global control - places all Q outputs in high-impedance state when high |
| 2–9 (D0–D7) | Data Inputs | Independent asynchronous D inputs for each flip-flop; TTL-compatible thresholds |
| 10 (GND) | Ground Reference | Primary return path for logic and output currents; decoupling required near pin |
| 11 (VCC) | Power Supply | +5-V supply rail; requires local 0.1-µF ceramic bypass capacitor |
| 12–19 (Q0–Q7) | 3-State Outputs | Registered outputs enabled only when OE = low; high-Z when disabled |
| 20 (CP) | Clock Input | Buffered positive-edge-triggered clock; synchronizes all eight D inputs simultaneously |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Controlled Outputs | Reduces simultaneous switching noise (SSN) and EMI in dense PCB layouts |
| Matched Rise/Fall Times | Ensures symmetrical signal edges - critical for setup/hold timing margin in high-speed buses |
| TTL-Compatible Input Levels | Accepts standard TTL VIH/VIL (2 V / 0.8 V) without level-shifting circuitry |
| Flow-Through Pinout | D-inputs on left, Q-outputs on right - simplifies PCB routing and reduces layer count |
| Partial-Power-Down (Ioff) | Blocks current flow when unpowered - essential for hot-swap and multi-rail system safety |
Applications
| Industrial Data Acquisition Backplane | Legacy System Bus Interface |
|---|---|
Use Scenario: Capturing analog-to-digital converter (ADC) sample data onto a shared 8-bit parallel bus under microcontroller control. IC Role / Device Role / Timing Role: Synchronizes burst-mode ADC outputs using CP edge; isolates bus during idle cycles via OE. Use Value: Enables deterministic sampling alignment and eliminates bus contention during conversion intervals. | Use Scenario: Interfacing modern FPGA I/O banks to legacy 5-V TTL peripherals (e.g., EPROMs, parallel port controllers). IC Role / Device Role / Timing Role: Acts as bidirectional bus buffer with direction control via OE; provides level-tolerant input thresholds. Use Value: Eliminates need for discrete level shifters while maintaining full 5-V drive strength and noise immunity. |
| Programmable Logic Controller I/O Module | Test Equipment Digital Pattern Generator |
Use Scenario: Latching sensor status bits from isolated field inputs into a central scan engine running at fixed cycle time. IC Role / Device Role / Timing Role: Stores real-time I/O states on CP edge; presents them to controller via 3-state outputs gated by scan enable. Use Value: Provides atomic snapshot capture and glitch-free readout during dynamic bus arbitration. | Use Scenario: Generating precise, repeatable 8-bit stimulus patterns for IC functional testing at up to 150 MHz. IC Role / Device Role / Timing Role: Holds pattern words from test sequencer memory; outputs synchronized to test clock via CP. Use Value: Delivers sub-7-ns timing accuracy and 64-mA drive to load fixture capacitance without waveform degradation. |
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 |
|---|---|---|---|
| SN74FCT574ATSOCT | Same SOIC-20 package, identical electrical specs, but supplied in tape-and-reel (2500 pcs) instead of tube (25 pcs) | Preferred for high-volume automated assembly; same thermal and layout footprint | Select when production volume justifies reel-based placement and inventory efficiency is prioritized |
| 74AC574SCX | Higher speed (tPD = 4.5 ns typ), lower drive (–24/+24 mA), no Ioff or edge-rate control | Suitable for low-noise, low-power 3.3/5-V mixed systems but lacks industrial hot-swap capability | Choose only if Ioff and noise suppression are non-critical and faster timing margins are required |
Compared with SN74FCT574ATSOCT, CY74FCT574ATSOC offers identical functionality in tube packaging for prototyping and low-volume builds; compared with 74AC574SCX, it delivers superior bus drive, industrial ESD robustness, and safe partial-power-down - making it the preferred choice for mission-critical industrial interfaces.
Availability
CY74FCT574ATSOC is available at Aetrix Electronics and suitable for industrial automation, legacy system upgrades, and test equipment requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for CY74FCT574ATSOC 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 for industrial, automotive, and communications markets.
The CY74FCT574ATSOC belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible bus interfacing in harsh industrial environments where reliability, drive strength, and power sequencing safety are mandatory.
FAQ
What is the maximum clock frequency supported by the CY74FCT574ATSOC?
The CY74FCT574ATSOC has a typical switching rate of 250 MHz and a maximum clock pulse width (tw) of 5 ns, supporting reliable operation up to approximately 150 MHz in real-world bus applications with proper layout and termination. Its 6.5-ns maximum propagation delay and 2-ns minimum setup/hold times enable robust timing margins at these frequencies. The CY74FCT574ATSOC datasheet specifies timing under worst-case conditions across temperature and voltage, ensuring design confidence.
Does the CY74FCT574ATSOC support hot-swap or partial-power-down operation?
Yes, the CY74FCT574ATSOC includes Ioff circuitry that actively disables outputs when VCC = 0 V, preventing damaging backflow current during hot-insertion or power sequencing events. This feature is explicitly characterized in the datasheet with Ioff ≤ ±1 µA at VCC = 0 V and VOUT = 4.5 V. The CY74FCT574ATSOC is therefore qualified for use in modular backplanes and redundant power systems where live component replacement is required.
What are the absolute maximum ratings for the CY74FCT574ATSOC?
The CY74FCT574ATSOC has an absolute maximum supply voltage of –0.5 V to 7 V, input/output voltage range of –0.5 V to 7 V, and maximum DC output sink current of 120 mA per pin. Exceeding these limits may cause permanent damage. The SOIC-20 package has a thermal impedance θJA of 58°C/W. These ratings are defined in the official Texas Instruments datasheet SCCS073 and apply regardless of operating mode or OE state.
How does the CY74FCT574ATSOC differ from the CY74FCT574CTSOC?
The CY74FCT574ATSOC and CY74FCT574CTSOC share identical SOIC-20 packaging and pinout but differ in speed grade: CY74FCT574ATSOC has a 6.5-ns maximum propagation delay and is rated for 150-MHz operation, while CY74FCT574CTSOC achieves 5.2 ns and supports up to 190 MHz. Both use the same FCT core, Ioff, and 3-state architecture. The CY74FCT574ATSOC is optimized for cost-sensitive industrial applications where moderate speed suffices.
Is the CY74FCT574ATSOC pin-compatible with older 74LS574 or 74ALS574 devices?
No, the CY74FCT574ATSOC is not pin-compatible with 74LS574 or 74ALS574. While it matches their logical function and 20-pin SOIC footprint, the pin assignments differ: CY74FCT574ATSOC uses a flow-through layout (D0–D7 on pins 2–9, Q0–Q7 on pins 12–19), whereas LS/ALS variants place outputs adjacent to inputs. Direct replacement requires PCB redesign. The CY74FCT574ATSOC is functionally and electrically compatible with other FCT-family registers like CY74FCT374T but not legacy bipolar TTL packages.
CY74FCT574ATSOC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 7.2ns @ 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-SOIC
CY74FCT574ATSOC FAQ
1.How can I place an order for CY74FCT574ATSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT574ATSOC 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 CY74FCT574ATSOC reliable?
The price and inventory of CY74FCT574ATSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT574ATSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT574ATSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT574ATSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT574ATSOC?
CY74FCT574ATSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT574ATSOC 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 CY74FCT574ATSOC?
For technical support, including CY74FCT574ATSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT574ATSOC requirements.
6.How does Aetrix verify that CY74FCT574ATSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT574ATSOC 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 CY74FCT574ATSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT574ATSOC?
All CY74FCT574ATSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT574ATSOC, 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 CY74FCT574ATSOC part is unused and in its original packaging.
Return procedure for CY74FCT574ATSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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