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Texas Instruments CY74FCT2574CTQCT
- Part No.:
- CY74FCT2574CTQCT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT2574CTQCT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,556
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Product details
Overview
CY74FCT2574CTQCT 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, 5.2 ns typical propagation delay (tPLH/tPHL), and Ioff support for partial-power-down operation. It operates at 4.75–5.25 V and is used in bus-oriented digital systems requiring noise-suppressed data latching and controlled output enable.
For engineers reviewing the CY74FCT2574CTQCT datasheet, CY74FCT2574CTQCT pinout, CY74FCT2574CTQCT application, or CY74FCT2574CTQCT equivalent, this device is selected for TTL-compatible 5 V logic interfaces where reduced transmission-line reflection noise, matched rise/fall times, and guaranteed 12 mA sink / 15 mA source drive are required in compact QSOP-20 packaging.
Technical Context
This device implements eight independent D-type flip-flops sharing a common buffered clock (CP) and active-low output-enable (OE) control. Each flip-flop captures the state of its D input on the low-to-high CP transition, with setup time (1.5 ns) and hold time (1 ns) specified at VCC = 5 V and TA = –40°C to 85°C.
Its 3-state outputs feature edge-rate control circuitry and on-die 25-Ω series termination to suppress signal reflections. The Ioff specification (±1 µA at VCC = 0 V) ensures backflow protection during partial power-down, and it maintains full TTL-level compatibility for both inputs and outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | 5.2 ns max at VCC = 5 V - enables 250-MHz system clock synchronization |
| Output Drive | 12 mA sink / 15 mA source - drives standard 50-Ω transmission lines without external buffers |
| Supply Voltage Range | 4.75–5.25 V - supports tightly regulated 5 V rail designs with ±5% tolerance |
| Input Compatibility | TTL-level VIH ≥ 2 V, VIL ≤ 0.8 V - interoperable with legacy 5 V logic families |
| Ioff Current | ±1 µA at VCC = 0 V - prevents damaging current flow during hot-insertion or partial shutdown |
| Output Series Resistance | 25 Ω typ - reduces ringing and EMI in PCB traces up to 10 cm length |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
Pinout & Package
Package: 20-pin QSOP (SSOP, DBQ), 0.65 mm pitch, 7.4 mm × 5.3 mm body, 1.2 mm height, moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Drives all 8 outputs to high-impedance when high; no effect on internal flip-flop states |
| 2–9 (D0–D7) | Data inputs | Independent asynchronous inputs latched on rising CP edge; TTL-compatible thresholds |
| 10 (GND) | Ground reference | Primary return path for all I/O and core logic; requires low-inductance connection |
| 11 (VCC) | Power supply | 5 V nominal supply; decoupling capacitor (0.1 µF) recommended within 5 mm |
| 12–19 (O0–O7) | 3-state outputs | Edge-rate controlled, 25-Ω series terminated; high-Z when OE = high |
| 20 (CP) | Buffered clock input | Rising-edge sensitive; internal buffer isolates clock load from system driver |
Key Features
| Feature | Design Value |
|---|---|
| On-die 25-Ω output series resistors | Eliminates need for external series termination resistors on PCB, reducing BOM count and layout area |
| Matched rise/fall times | Minimizes duty-cycle distortion in clock distribution and data capture paths |
| Edge-rate control circuitry | Reduces simultaneous switching noise (SSN) and radiated emissions in dense logic layouts |
| Ioff partial-power-down support | Enables safe interoperation with unpowered system sections during hot-swap or sleep-mode sequencing |
| ESD protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22-A114/A115/C101 for robust board handling |
Applications
| Industrial PLC Backplane Interface | Legacy Bus Data Latching |
|---|---|
|
Use Scenario: Isolating and synchronizing parallel data between microcontroller peripherals and legacy ISA/PCI-like backplanes operating at 5 V. IC Role / Device Role / Timing Role: Acts as a noise-immune, clock-aligned latch stage that buffers address/data bus signals before driving long trace runs. Use Value: Integrated 25-Ω termination and edge-rate control reduce signal integrity issues across 15 cm backplane traces without adding discrete components. |
Use Scenario: Capturing and holding status bits from electromechanical sensors (e.g., limit switches, relay contacts) in factory automation controllers. IC Role / Device Role / Timing Role: Provides synchronized, glitch-free sampling of slow-varying TTL-level inputs using a system clock edge. Use Value: 1.5 ns setup/1 ns hold timing allows reliable capture even with marginal clock skew in multi-board systems. |
| Telecom Line Card Data Buffering | Test Equipment Digital Pattern Generation |
|
Use Scenario: Driving multiple downstream logic loads (e.g., FPGA configuration buses, LED drivers) from a shared 5 V control bus in telecom line cards. IC Role / Device Role / Timing Role: Functions as an OE-gated, low-noise bus driver with precise timing alignment to system clocks. Use Value: 12 mA sink capability ensures clean low-level assertion across 10+ TTL loads while suppressing ground bounce. |
Use Scenario: Generating stable, jitter-controlled parallel stimulus patterns for IC functional testing at up to 200 MHz. IC Role / Device Role / Timing Role: Serves as a deterministic, low-skew pattern register synchronized to tester master clock. Use Value: 5.2 ns propagation delay variation < 1 ns across channels enables sub-nanosecond inter-channel skew control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT2374CTQCT | Identical electrical specs but input/output pins interleaved (D/O alternating); different pinout layout | Requires PCB redesign due to non-matching pin assignment; same timing and drive strength | Select only if existing layout uses interleaved I/O arrangement or space constraints favor alternate routing |
| SN74FCT574NSR | Same function but SOIC-20 package; no integrated 25-Ω series resistors; higher VOH (3.5 V typ) | Lacks on-die termination - external resistors needed for noise-critical traces; larger footprint | Prefer when cost sensitivity outweighs noise performance, or when SOIC-20 is already standardized in design |
Compared with CY74FCT2574CTQCT, CY74FCT2374CTQCT offers identical functionality but demands layout changes due to pinout mismatch, while SN74FCT574NSR trades integrated termination and QSOP compactness for lower unit cost and SOIC availability - making CY74FCT2574CTQCT optimal for noise-sensitive, space-constrained 5 V bus interfaces.
Availability
CY74FCT2574CTQCT is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, telecom line card buffering, and test equipment digital pattern generation requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for CY74FCT2574CTQCT 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, industrial qualification, and long-term product availability.
CY74FCT2574CTQCT belongs to the FCT logic family designed specifically for noise-resilient, high-speed 5 V TTL-compatible digital interfacing in industrial and communications infrastructure equipment.
FAQ
What is the maximum clock frequency supported by CY74FCT2574CTQCT?
CY74FCT2574CTQCT is characterized for 250-MHz typical switching rate and has a minimum CP pulse width of 4 ns, enabling reliable operation up to 125 MHz in synchronous systems with margin. Its 5.2 ns propagation delay and tight timing parameters ensure stable data capture at these frequencies under industrial temperature conditions.
Does CY74FCT2574CTQCT require external pull-up or pull-down resistors on unused inputs?
Yes - per TI's recommended operating conditions, all unused inputs of CY74FCT2574CTQCT must be held at VCC or GND to prevent floating nodes that could cause excessive ICC current, logic instability, or increased EMI. This applies to D0–D7, CP, and OE if not actively driven.
Can CY74FCT2574CTQCT be used in mixed-voltage systems with 3.3 V controllers?
No - CY74FCT2574CTQCT is strictly a 5 V device with VCC range 4.75–5.25 V and TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V). While it can accept 3.3 V logic-high signals (≥2 V), it cannot be powered from 3.3 V and will not drive 3.3 V–tolerant inputs safely without level-shifting.
How does the 25-Ω output series resistance in CY74FCT2574CTQCT improve signal integrity?
The 25-Ω on-die series resistor in CY74FCT2574CTQCT forms a controlled impedance match with typical 50-Ω PCB traces, reducing signal reflections at the driver end. This lowers overshoot, undershoot, and ringing - especially critical for trace lengths >5 cm - without requiring external resistors or layout adjustments.
Is CY74FCT2574CTQCT pin-compatible with CY74FCT574T-series devices?
No - CY74FCT2574CTQCT is functionally compatible but not pin-compatible with CY74FCT574T. The CY74FCT2574CTQCT places all D inputs on pins 2–9 and all O outputs on pins 12–19, whereas CY74FCT574T uses interleaved I/O. Direct replacement requires PCB redesign.
CY74FCT2574CTQCT 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:
- 250 MHz
- Max Propagation Delay @ V, Max CL:
- 5.2ns @ 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-SSOP
CY74FCT2574CTQCT FAQ
1.How can I place an order for CY74FCT2574CTQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2574CTQCT 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 CY74FCT2574CTQCT reliable?
The price and inventory of CY74FCT2574CTQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2574CTQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT2574CTQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2574CTQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2574CTQCT?
CY74FCT2574CTQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2574CTQCT 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 CY74FCT2574CTQCT?
For technical support, including CY74FCT2574CTQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2574CTQCT requirements.
6.How does Aetrix verify that CY74FCT2574CTQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT2574CTQCT 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 CY74FCT2574CTQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT2574CTQCT?
All CY74FCT2574CTQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2574CTQCT, 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 CY74FCT2574CTQCT part is unused and in its original packaging.
Return procedure for CY74FCT2574CTQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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