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Texas Instruments CY74FCT2574ATSOC
- Part No.:
- CY74FCT2574ATSOC
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT2574ATSOC.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:593
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Product details
Overview
CY74FCT2574ATSOC from Texas Instruments is a high-speed, low-power 8-bit edge-triggered D-type flip-flop register with 3-state outputs, 25-Ω integrated output series resistors, 12-mA sink/15-mA source drive, and Ioff support for partial-power-down operation - used in bus-oriented digital systems requiring noise-suppressed data latching and controlled output enable.
For engineers reviewing the CY74FCT2574ATSOC datasheet, CY74FCT2574ATSOC pinout, CY74FCT2574ATSOC application, or CY74FCT2574ATSOC equivalent, key selection factors include its 10 ns max propagation delay (tPLH/tPHL), 5.25 V absolute max supply rating, SOIC-20 package with input/output separation, and compatibility with TTL-level inputs and 3.3-V-typical VOH in 5-V systems.
Technical Context
This device implements eight independent D-type latches synchronized to the low-to-high transition of a common buffered clock (CP) input, with all eight outputs driven onto a shared 3-state bus via a single OE control signal. Each flip-flop stores its D-input state only when setup and hold time requirements (2 ns tsu, 1.5 ns tth) are met relative to CP↑.
The CY74FCT2574ATSOC integrates on-die 25-Ω series termination at each output to suppress transmission-line reflections, features matched rise/fall times for reduced EMI, and uses Ioff circuitry to block current backflow when VCC = 0 V - enabling safe hot-insertion and partial power-down in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit edge-triggered D-type register with 3-state outputs |
| Propagation Delay (tPLH/tPHL) | Max 10 ns at VCC = 5.25 V - enables reliable operation up to 100 MHz system clock rates |
| Output Drive | 12 mA sink / 15 mA source - sufficient to drive standard 50-Ω transmission lines and TTL loads |
| Supply Voltage Range | 4.75 V to 5.25 V - tightly regulated 5-V operation with ±5% tolerance |
| Ioff Current | ±1 µA at VCC = 0 V - prevents damaging back-current during partial power-down |
| Input Compatibility | Fully compatible with TTL logic levels (VIL ≤ 0.8 V, VIH ≥ 2.0 V) |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for board-level robustness |
Pinout & Package
Package: SOIC-20 (DW), 7.6 mm × 12.83 mm body, 2.65 mm max height, 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: drives all 8 outputs to high-Z when high; enables Q-state output when low |
| 2–9 (D0–D7) | Data Inputs | Individual asynchronous D inputs for each flip-flop; accept TTL-compatible voltage levels |
| 10 (GND) | Ground Reference | Primary return path for logic and output currents; must be low-impedance for noise control |
| 11 (VCC) | Power Supply | 5-V nominal supply; supports 4.75–5.25 V range; decoupling required near pin |
| 12–19 (O0–O7) | 3-State Outputs | Octal buffered outputs with integrated 25-Ω series resistors - reduce reflection-induced noise on PCB traces |
| 20 (CP) | Clock Input | Buffered edge-triggered clock; latches D-input states on low-to-high transition only |
Key Features
| Feature | Design Value |
|---|---|
| On-die 25-Ω output series resistors | Reduces transmission-line reflection noise without external components - simplifies layout and improves signal integrity |
| Edge-rate control circuitry | Controls slew rate to minimize simultaneous switching noise (SSN) and crosstalk in dense bus environments |
| Ioff partial-power-down support | Enables safe isolation of powered-down sections in mixed-voltage systems without risk of reverse current damage |
| Matched rise/fall times | Ensures symmetrical output transitions - critical for timing-critical applications like address/data latching |
| TTL-compatible input thresholds | Accepts standard TTL VIH/VIL levels - eliminates need for level-shifting when interfacing legacy logic |
Applications
| Microprocessor Data Bus Interface | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Latching parallel data between a microprocessor's multiplexed AD bus and peripheral devices during memory or I/O read/write cycles. IC Role / Device Role / Timing Role: Acts as an octal transparent latch/register that captures and holds data synchronously with CPU clock edges while isolating bus loading via 3-state outputs. Use Value: Enables clean separation of address and data phases using a single clock edge, with 10 ns propagation delay ensuring timing margin in 10-MHz bus systems. | Use Scenario: Buffering and isolating digital input signals from field sensors (e.g., limit switches, photoelectric sensors) before routing to a PLC's central logic unit. IC Role / Device Role / Timing Role: Provides synchronized sampling and noise-immune storage of 8 discrete inputs, with OE allowing dynamic bus arbitration across multiple I/O modules. Use Value: Integrated 25-Ω output resistors suppress ringing on long sensor cables, and Ioff allows safe hot-swap of I/O cards without powering down the entire controller. |
| Test Equipment Pattern Generator | Legacy System Bus Repeater |
Use Scenario: Generating precise, synchronized 8-bit stimulus patterns for IC functional testing or PCB boundary-scan validation. IC Role / Device Role / Timing Role: Functions as a deterministic pattern register whose outputs are updated only on CP↑, enabling repeatable, jitter-free waveform generation. Use Value: 2 ns minimum setup time and matched edge rates ensure sub-nanosecond timing repeatability - critical for high-speed digital test vector accuracy. | Use Scenario: Isolating and regenerating aging 5-V TTL bus segments in retrofitted avionics or telecom backplanes where signal integrity has degraded due to trace length or connector wear. IC Role / Device Role / Timing Role: Serves as a noise-suppressing bus repeater with 3-state capability, allowing bidirectional segment isolation and signal regeneration without adding latency. Use Value: On-chip 25-Ω termination eliminates need for discrete resistors, reducing BOM count and PCB area while restoring signal fidelity on marginal interconnects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit registered buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT2574TSOC | Slower speed grade: 10 ns max tPLH/tPHL vs. 6.5 ns for CY74FCT2574ATSOC; identical pinout, package, and DC specs | Suitable for cost-sensitive designs where 250-MHz switching rate is not required; lower dynamic power at same frequency | Select CY74FCT2574TSOC if system clock ≤ 50 MHz and budget constraints outweigh timing margin needs. |
| SN74FCT574NSR | Different pinout (inputs/outputs interleaved); no integrated 25-Ω series resistors; higher ICCD (0.12 mA/MHz vs. 0.06 mA/MHz) | Lacks on-die termination - requires external resistors for reflection control; less suitable for noise-critical bus interfaces | Choose SN74FCT574NSR only when legacy board layout mandates pin-compatible replacement without redesign. |
Compared with CY74FCT2574TSOC, the CY74FCT2574ATSOC delivers tighter timing (6.5 ns vs. 10 ns propagation) for higher-frequency bus operation; versus SN74FCT574NSR, it provides superior noise suppression via integrated termination and lower dynamic power, but requires attention to its input/output side-separated pinout during layout.
Availability
CY74FCT2574ATSOC is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for CY74FCT2574ATSOC 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, with over 50 years of innovation in high-reliability digital interface components.
The CY74FCT2574ATSOC belongs to TI's FCT logic family - engineered for noise-immune, high-speed 5-V bus interfacing in industrial, telecom, and computing systems where signal integrity and power-down safety are critical.
FAQ
What is the maximum clock frequency supported by CY74FCT2574ATSOC?
The CY74FCT2574ATSOC has a typical switching rate of 250 MHz and a maximum propagation delay of 6.5 ns (tPLH/tPHL). Based on this, the device supports reliable operation up to approximately 100 MHz in synchronous bus applications, assuming adequate setup/hold margins and proper PCB layout. The 6.5 ns spec applies under recommended operating conditions (VCC = 4.75–5.25 V, TA = –40°C to 85°C).
Does CY74FCT2574ATSOC support hot-swap or partial-power-down operation?
Yes, CY74FCT2574ATSOC includes Ioff circuitry that disables outputs and limits current to ±1 µA when VCC = 0 V. This feature allows safe insertion or removal of the device in live backplanes and enables partial-power-down modes in multi-rail systems without risk of damaging back-current - a key requirement for industrial and telecom applications.
How does the 25-Ω output series resistor in CY74FCT2574ATSOC improve system performance?
The integrated 25-Ω output series resistor in CY74FCT2574ATSOC reduces transmission-line reflection noise on PCB traces and cables by matching typical trace impedances. This eliminates the need for external series resistors, lowers BOM count, saves board space, and improves signal integrity - especially in high-speed, long-run bus applications such as PLC I/O modules or test equipment interfaces.
Is CY74FCT2574ATSOC pin-compatible with CY74FCT574T or CY74FCT2374T?
CY74FCT2574ATSOC is functionally compatible with CY74FCT574T but has a different pinout: all inputs (D0–D7) are on one side (pins 2–9), all outputs (O0–O7) on the opposite side (pins 12–19). It is identical to CY74FCT2374T except for this physical arrangement - meaning direct PCB replacement requires layout verification, not blind substitution.
What are the absolute maximum ratings for CY74FCT2574ATSOC?
CY74FCT2574ATSOC 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 sink current per output of 120 mA. Exceeding these values may cause permanent damage. Recommended operating conditions specify VCC = 4.75–5.25 V, TA = –40°C to 85°C, and all unused inputs tied to VCC or GND for reliable operation.
CY74FCT2574ATSOC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 250 MHz
- Max Propagation Delay @ V, Max CL:
- 10ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 12mA
- 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
CY74FCT2574ATSOC FAQ
1.How can I place an order for CY74FCT2574ATSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2574ATSOC 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 CY74FCT2574ATSOC reliable?
The price and inventory of CY74FCT2574ATSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2574ATSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT2574ATSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2574ATSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2574ATSOC?
CY74FCT2574ATSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2574ATSOC 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 CY74FCT2574ATSOC?
For technical support, including CY74FCT2574ATSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2574ATSOC requirements.
6.How does Aetrix verify that CY74FCT2574ATSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT2574ATSOC 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 CY74FCT2574ATSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT2574ATSOC?
All CY74FCT2574ATSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2574ATSOC, 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 CY74FCT2574ATSOC part is unused and in its original packaging.
Return procedure for CY74FCT2574ATSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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