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Texas Instruments CY74FCT574TSOCT
- Part No.:
- CY74FCT574TSOCT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT574TSOCT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,675
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Product details
Overview
CY74FCT574TSOCT 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, 5.2-ns max propagation delay, and Ioff partial-power-down support - enabling use in hot-swap and power-gated applications such as industrial PLC backplanes and embedded data acquisition interfaces.
For engineers reviewing the CY74FCT574TSOCT datasheet, CY74FCT574TSOCT pinout, CY74FCT574TSOCT application, or CY74FCT574TSOCT equivalent, key selection criteria include its SOIC-20 package, TTL-compatible input/output levels, 3.3-V typical VOH, matched rise/fall times, and edge-rate-controlled noise performance in high-density PCB layouts.
Technical Context
The CY74FCT574TSOCT implements eight independent D-type flip-flops sharing a single positive-edge-triggered clock (CP) and a common 3-state output-enable (OE) input. Its flow-through pinout simplifies PCB routing by aligning inputs on one side and outputs on the opposite side. The device uses FCT logic architecture with edge-rate control circuitry to suppress simultaneous switching noise.
It supports partial-power-down via Ioff, which disables outputs when VCC = 0 V to prevent backflow current. All inputs tolerate TTL voltage levels (VIH = 2 V min, VIL = 0.8 V max), and outputs drive standard TTL loads while maintaining CMOS-compatible thresholds under 5-V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit positive-edge-triggered D-type register with 3-state outputs |
| Propagation Delay (tPLH/tPHL) | 5.2 ns max - enables reliable operation at ≥100 MHz system clock rates |
| Output Drive Strength | 64 mA sink / 32 mA source - sufficient to drive multiple TTL loads or stub-loaded buses |
| Supply Voltage Range | 4.75 V to 5.25 V - tight tolerance ensures stable timing across industrial temperature range (–40°C to 85°C) |
| Ioff Support | Active at VCC = 0 V - prevents damaging current flow during hot-insertion or power sequencing |
| Input Compatibility | Fully TTL-compatible - accepts standard 0.8 V/2.0 V logic thresholds without level translation |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets JEDEC JESD22 requirements for robust board-level handling |
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, 2, 3, 4, 5, 6, 7, 8 | D0–D7 Data Inputs | Individual asynchronous data inputs to each of eight D-type flip-flops |
| 9 | GND | Ground reference for all internal logic and output drivers |
| 10 | VCC | +5-V supply rail; powers internal logic and output stage |
| 11–18 | O0–O7 Outputs | 3-state buffered outputs reflecting registered D-input state when OE = L |
| 19 | CP | Buffered clock input; triggers register update on low-to-high transition |
| 20 | OE | Active-low output-enable; places O0–O7 in high-impedance state when high |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input pins (D0–D7) on left side, output pins (O0–O7) on right side - reduces layer count and crosstalk in dense bus routing |
| Edge-rate controlled outputs | Controlled slew rate minimizes ground bounce and EMI in high-speed parallel interfaces |
| Matched rise/fall times | Ensures symmetrical signal integrity for bidirectional bus timing margins |
| TTL-compatible I/O | Operates directly with legacy 5-V TTL systems without level shifters or pull-ups |
| Partial-power-down (Ioff) | Enables safe insertion/removal in live backplanes and modular systems with mixed-power domains |
Applications
| Industrial Backplane Interface | Data Acquisition Bus Buffer |
|---|---|
Use Scenario: Interfacing microcontroller GPIOs to a 20-slot industrial I/O rack with shared address/data bus. IC Role / Device Role / Timing Role: Registers and isolates control signals between CPU and peripheral modules using CP-synchronized latching and OE-gated bus access. Use Value: 5.2-ns propagation delay and 64-mA drive ensure clean signal edges across 30-cm ribbon cable runs at 25-MHz burst rates. | Use Scenario: Capturing parallel ADC output (8-bit) into a buffer before serial transmission to an FPGA. IC Role / Device Role / Timing Role: Edge-triggered storage element synchronizing analog-to-digital conversion results to system clock domain. Use Value: Matched tPLH/tPHL and Ioff support allow glitch-free capture even during intermittent power cycling of sensor subsystems. |
| Programmable Logic Controller (PLC) Output Stage | Legacy System Bus Extender |
Use Scenario: Driving discrete 24-V DC output modules from a 5-V logic controller in factory automation cabinets. IC Role / Device Role / Timing Role: High-current 3-state register buffering PLC CPU writes to isolated output latch registers. Use Value: 64-mA sink capability directly drives optocoupler inputs; OE allows dynamic bus arbitration between multiple controller cards. | Use Scenario: Adding 8-bit data latching to a vintage 8086-based computer expansion slot without modifying motherboard layout. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 74LS374 with identical pinout and enhanced noise immunity. Use Value: Flow-through pinout matches original footprint; edge-rate control eliminates need for external RC damping on long ISA bus traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT374SOCT | Same FCT family, but conventional pinout (non-flow-through); 32-mA sink/source drive | Lacks optimized routing layout; lower drive limits use in low-fanout or short-trace designs | Select when board layout already accommodates traditional input/output placement and reduced drive suffices |
| 74ACT374SOIC | CMOS-based, 5-V tolerant, 24-mA drive; no Ioff or edge-rate control | Higher static power; unsuitable for hot-swap or noisy industrial environments | Prefer only in cost-sensitive, non-critical commercial applications with stable power domains |
Compared with SN74FCT374SOCT and 74ACT374SOIC, the CY74FCT574TSOCT delivers superior bus-driving capability, deterministic hot-swap safety via Ioff, and layout-friendly flow-through pin assignment - making it the optimal choice for new industrial control and data acquisition designs requiring reliability and signal integrity.
Availability
CY74FCT574TSOCT is available at Aetrix Electronics and suitable for industrial PLC backplanes, data acquisition bus buffers, programmable logic controller output stages, and legacy system bus extenders requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for CY74FCT574TSOCT 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 CY74FCT574TSOCT belongs to TI's FCT logic family, engineered for high-speed, low-noise, bus-oriented digital interfacing in harsh industrial environments where reliability, timing precision, and power sequencing resilience are critical.
FAQ
What is the maximum clock frequency supported by the CY74FCT574TSOCT?
The CY74FCT574TSOCT has a maximum clock pulse width (tw) of 5 ns and a typical switching rate of 250 MHz. Based on timing specifications including 5.2-ns max tPLH/tPHL and 2-ns min setup/hold times, the device reliably operates at clock frequencies up to 100 MHz in standard industrial conditions. For sustained 250-MHz operation, system-level signal integrity, load capacitance (<50 pF), and PCB layout must be rigorously controlled per TI's application guidelines for the CY74FCT574TSOCT.
Does the CY74FCT574TSOCT support hot-swap or partial-power-down operation?
Yes, the CY74FCT574TSOCT supports partial-power-down via its Ioff circuitry. When VCC = 0 V, the Ioff feature disables all outputs and limits leakage current to ±1 µA, preventing damaging backflow current from live bus lines into the unpowered device. This makes the CY74FCT574TSOCT suitable for hot-plug applications such as modular industrial backplanes and field-replaceable I/O cards where power domains are sequenced independently.
What is the pin compatibility status between CY74FCT574TSOCT and older 74LS374 devices?
The CY74FCT574TSOCT is functionally compatible with 74LS374 but not pin-for-pin identical. It uses a flow-through pinout (D0–D7 on left, O0–O7 on right) versus the LS374's interleaved arrangement. However, both share the same SOIC-20 package footprint, power/ground pin locations (pins 9/GND, 10/VCC), and CP/OE positions (pins 19/20). Board redesign is required for direct replacement, but the CY74FCT574TSOCT offers improved drive, noise immunity, and Ioff - justifying layout updates in new designs.
What are the absolute maximum ratings for CY74FCT574TSOCT supply and I/O voltages?
The CY74FCT574TSOCT has an absolute maximum supply voltage (VCC) of –0.5 V to 7 V, and absolute maximum input/output voltage range of –0.5 V to 7 V relative to GND. Exceeding these limits may cause permanent damage. Recommended operating conditions specify VCC = 4.75 V to 5.25 V, with VIH ≥ 2.0 V and VIL ≤ 0.8 V. These ratings ensure robust operation in industrial environments with transient coupling, while the 7-V absolute limit provides margin against short-duration overvoltage events on the CY74FCT574TSOCT bus lines.
How does the edge-rate control in CY74FCT574TSOCT improve system-level noise performance?
The CY74FCT574TSOCT integrates edge-rate control circuitry that limits output slew rate without external components, reducing simultaneous switching noise (SSN) and ground bounce. This design lowers radiated EMI and improves signal integrity on shared buses - especially critical in high-density industrial PCBs with multiple parallel data paths. Measured improvements include significantly suppressed ringing on 50-pF loads and >10 dB reduction in peak spectral emissions above 30 MHz compared to non-edge-controlled equivalents like standard 74FCT374 variants.
CY74FCT574TSOCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 10ns @ 5V, 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
CY74FCT574TSOCT FAQ
1.How can I place an order for CY74FCT574TSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT574TSOCT 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 CY74FCT574TSOCT reliable?
The price and inventory of CY74FCT574TSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT574TSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT574TSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT574TSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT574TSOCT?
CY74FCT574TSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT574TSOCT 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 CY74FCT574TSOCT?
For technical support, including CY74FCT574TSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT574TSOCT requirements.
6.How does Aetrix verify that CY74FCT574TSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT574TSOCT 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 CY74FCT574TSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT574TSOCT?
All CY74FCT574TSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT574TSOCT, 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 CY74FCT574TSOCT part is unused and in its original packaging.
Return procedure for CY74FCT574TSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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