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Texas Instruments 74FCT2574CTSOCTG4
- Part No.:
- 74FCT2574CTSOCTG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74FCT2574CTSOCTG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,085
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Product details
Overview
74FCT2574CTSOCTG4 from Texas Instruments is an octal edge-triggered D-type flip-flop register with 3-state outputs, 5.2 ns propagation delay (tPLH/tPHL), 25-Ω integrated output series resistors, and Ioff support for partial-power-down operation. It operates at 4.75–5.25 V, delivers ±15 mA output drive, and targets bus-oriented digital systems requiring noise-immune data latching.
For engineers reviewing the 74FCT2574CTSOCTG4 datasheet, 74FCT2574CTSOCTG4 pinout, 74FCT2574CTSOCTG4 application, or 74FCT2574CTSOCTG4 equivalent, key selection criteria include its 3-state bus interface capability, matched rise/fall times, TTL-compatible input thresholds, and SOIC-20 package with input/output separation for PCB layout optimization.
Technical Context
This device implements eight independent D-type latches triggered on the low-to-high clock (CP) transition, with synchronous storage governed by setup (1.5 ns) and hold (1 ns) timing constraints. All flip-flops share a common buffered CP and active-low output-enable (OE) control signal.
Its edge-rate control circuitry and on-die 25-Ω series termination resistors suppress transmission-line reflections, while Ioff protection disables outputs during VCC = 0 V to prevent backflow current-enabling safe hot-insertion and multi-rail system interoperability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 5.2 ns max (tPLH/tPHL), enabling 250-MHz typical switching in synchronous bus applications |
| Supply Voltage | 4.75–5.25 V, compatible with standard 5-V TTL and CMOS logic domains |
| Output Drive | ±15 mA (source/sink), sufficient to drive multiple TTL loads without external buffers |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - fully compatible with TTL input logic levels |
| Output Termination | 25 Ω series resistance per output - reduces signal reflection noise on PCB traces |
| Ioff Protection | ±1 µA max leakage at VCC = 0 V - prevents damaging current flow during partial power-down |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JESD22 standards for robust handling |
Pinout & Package
74FCT2574CTSOCTG4 is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body size, with gull-wing leads and RoHS-compliant CU NIPDAU finish (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-Low Output Enable | Controls all 8 outputs simultaneously; high = high-impedance, low = functional data output |
| 2–9 (D0–D7) | Data Inputs | Independent D-type inputs for each flip-flop; routed to one side of package for clean input routing |
| 10 (GND) | Ground Reference | Primary return path for logic and output currents; requires low-inductance PCB connection |
| 11 (VCC) | Power Supply | +5 V supply rail; decoupling capacitor required within 1 cm of this pin |
| 12–19 (O0–O7) | 3-State Outputs | Octal registered outputs with internal 25-Ω series termination; placed opposite inputs for minimized crosstalk |
| 20 (CP) | Clock Input | Buffered edge-triggered clock; low-to-high transition captures D-input states into flip-flops |
Key Features
| Feature | Design Value |
|---|---|
| Input/Output Separation | All D inputs on pins 2–9 and all O outputs on pins 12–19 - simplifies layer routing and reduces inter-layer coupling |
| Matched Edge Rates | Rise and fall times balanced to minimize ground bounce and EMI in high-speed parallel buses |
| TTL-Compatible Interface | Accepts standard TTL VIH/VIL and drives TTL loads directly - eliminates level-shifter requirements |
| Partial-Power-Down Support | Ioff circuitry ensures zero backflow current when VCC = 0 V - enables live insertion in modular backplane systems |
| Noise-Optimized Architecture | On-chip 25-Ω series resistors + edge-rate control reduce overshoot/ringing by >40% vs. non-terminated FCT variants |
Applications
| Industrial PLC Backplane | Test Equipment Data Capture |
|---|---|
Use Scenario: Latching sensor data across a 5-V parallel bus in programmable logic controller racks with hot-swap capability. IC Role / Device Role / Timing Role: Octal register synchronizing asynchronous analog-to-digital converter outputs to a centralized control clock domain. Use Value: Ioff protection prevents bus contention during module insertion/removal; 25-Ω termination maintains signal integrity over 15-cm backplane traces. | Use Scenario: Capturing parallel digital stimulus responses in automated test equipment with precise timing alignment. IC Role / Device Role / Timing Role: Edge-triggered data capture register aligning multi-bit response vectors to a master test clock edge. Use Value: 1.5 ns setup/1 ns hold time enables reliable sampling at 100+ MHz test clock rates; matched tPLH/tPHL ensures deterministic skew. |
| Legacy Bus Interface Adapter | Embedded Control Data Buffer |
Use Scenario: Bridging legacy 5-V TTL peripherals (e.g., ISA-style I/O cards) to modern microcontroller buses with voltage translation. IC Role / Device Role / Timing Role: Bidirectional bus latch providing direction-controlled data isolation between mismatched subsystems. Use Value: 3-state outputs enable shared-bus arbitration; TTL-compatible thresholds eliminate external level shifters for direct interfacing. | Use Scenario: Temporarily storing command words from an ARM Cortex-M4 core before dispatch to a motor driver ASIC. IC Role / Device Role / Timing Role: Synchronous data staging register decoupling processor write bursts from downstream timing-critical peripherals. Use Value: Low 5.2 ns propagation delay minimizes pipeline latency; ±15 mA drive strength sustains signal integrity into capacitive ASIC inputs. |
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 |
|---|---|---|---|
| CY74FCT2574ATSOCTG4 | Slower 6.5 ns propagation delay; identical pinout, package, and Ioff support | Better suited for cost-sensitive designs where 250-MHz switching is not required | Select when lower dynamic power or relaxed timing margins are acceptable |
| SN74FCT574NSR | Same function but no integrated 25-Ω termination; higher VOH (3.5 V typical); different pin mapping (inputs/outputs interleaved) | Requires external series resistors for noise control; less optimal for high-noise industrial environments | Choose only if board space allows discrete termination or legacy design reuse is mandatory |
Compared with CY74FCT2574ATSOCTG4, the 74FCT2574CTSOCTG4 offers faster timing for high-throughput bus systems; versus SN74FCT574NSR, it provides superior signal integrity via monolithic termination and input/output physical separation-reducing layout complexity and improving noise immunity without added BOM cost.
Availability
74FCT2574CTSOCTG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automated test equipment, legacy bus adapters, and embedded control data buffering requiring stable component supply and long-term lifecycle assurance.
Supply support for 74FCT2574CTSOCTG4 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, power efficiency, and system-level integration.
The 74FCT2574CTSOCTG4 belongs to TI's FCT logic family-designed specifically for noise-resilient, high-speed 5-V digital bus interfaces in industrial, test, and computing infrastructure applications.
FAQ
What is the maximum clock frequency supported by the 74FCT2574CTSOCTG4?
The 74FCT2574CTSOCTG4 supports a typical switching rate of 250 MHz, derived from its 5.2 ns maximum propagation delay (tPLH/tPHL) and tight 1.5 ns setup/1 ns hold timing window. This enables reliable operation in high-speed synchronous bus architectures where clock periods exceed 4 ns, provided PCB layout adheres to controlled-impedance routing and proper decoupling.
Does the 74FCT2574CTSOCTG4 require external pull-up or pull-down resistors on unused inputs?
Yes - per TI's recommended operating conditions, all unused inputs of the 74FCT2574CTSOCTG4 must be held at either VCC or GND to ensure predictable logic states and prevent floating-node-induced current leakage or oscillation. Leaving inputs unconnected may cause increased ICC, erratic output behavior, or accelerated device aging due to undefined internal node voltages.
How does the Ioff feature of the 74FCT2574CTSOCTG4 protect the system during partial power-down?
The Ioff feature in the 74FCT2574CTSOCTG4 disables all outputs when VCC = 0 V, limiting leakage current to ±1 µA regardless of signal levels applied to I/O pins. This prevents damaging reverse current flow from powered sections of the bus into the unpowered device - a critical safeguard in hot-pluggable modules, multi-rail power systems, and systems with staggered power sequencing.
Can the 74FCT2574CTSOCTG4 drive standard TTL loads directly without buffer amplification?
Yes - the 74FCT2574CTSOCTG4 delivers ±15 mA output drive (12 mA sink / 15 mA source), exceeding the ±0.4 mA requirement of standard TTL inputs. Its VOH (min 2.4 V at –15 mA) and VOL (max 0.55 V at 12 mA) meet TTL voltage thresholds, allowing direct fan-out to up to 10 standard TTL loads per output without external buffers or level translators.
What is the significance of the 25-Ω output series resistance in the 74FCT2574CTSOCTG4?
The 25-Ω on-die series resistance in the 74FCT2574CTSOCTG4 acts as source termination for transmission lines, reducing signal reflections caused by impedance mismatches on PCB traces. This improves waveform fidelity, lowers EMI emissions, and increases timing margin - particularly beneficial in point-to-multipoint bus topologies or longer (>10 cm) trace runs where unterminated drivers would exhibit overshoot, ringing, or false triggering.
74FCT2574CTSOCTG4 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:
- 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-SOIC
74FCT2574CTSOCTG4 FAQ
1.How can I place an order for 74FCT2574CTSOCTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT2574CTSOCTG4 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 74FCT2574CTSOCTG4 reliable?
The price and inventory of 74FCT2574CTSOCTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT2574CTSOCTG4 is usually 5 days.
3.What payment methods are accepted for 74FCT2574CTSOCTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT2574CTSOCTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT2574CTSOCTG4?
74FCT2574CTSOCTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT2574CTSOCTG4 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 74FCT2574CTSOCTG4?
For technical support, including 74FCT2574CTSOCTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT2574CTSOCTG4 requirements.
6.How does Aetrix verify that 74FCT2574CTSOCTG4 is sourced from the original manufacturer or authorized distributors?
All 74FCT2574CTSOCTG4 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 74FCT2574CTSOCTG4 meets industry standards.
7.What is the process for return or replacement of 74FCT2574CTSOCTG4?
All 74FCT2574CTSOCTG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT2574CTSOCTG4, 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 74FCT2574CTSOCTG4 part is unused and in its original packaging.
Return procedure for 74FCT2574CTSOCTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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