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Texas Instruments CY74FCT2574CTSOCT
- Part No.:
- CY74FCT2574CTSOCT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT2574CTSOCT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,160
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Product details
Overview
CY74FCT2574CTSOCT from Texas Instruments is an 8-bit edge-triggered D-type flip-flop register with 3-state outputs, designed for high-speed bus-oriented applications. It features 25-Ω output series resistors, 5.2 ns typical propagation delay (tPLH/tPHL), ±15 mA output drive, and Ioff support for partial-power-down operation. It operates at 4.75–5.25 V and is used in data buffering and synchronous bus interface circuits.
For engineers reviewing the CY74FCT2574CTSOCT datasheet, CY74FCT2574CTSOCT pinout, CY74FCT2574CTSOCT application, or CY74FCT2574CTSOCT equivalent, key selection criteria include 3-state bus contention control, TTL-compatible input thresholds, matched rise/fall times, and SOIC-20 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
This device implements eight independent D-type latches triggered on the low-to-high clock (CP) transition, with a common buffered clock and output-enable (OE) control. All inputs are on one side of the SOIC-20 package and all outputs on the opposite side - a layout optimized for PCB routing in dense bus systems.
It integrates edge-rate control circuitry and on-die 25-Ω series termination to suppress transmission-line reflections. The Ioff feature disables outputs when VCC = 0 V, preventing backflow current during partial power-down - critical for hot-swap and mixed-voltage system designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | 5.2 ns max - enables reliable 250-MHz bus operation with tight timing margins |
| Output Drive | ±15 mA - sufficient to drive standard TTL loads without external buffers |
| Supply Voltage Range | 4.75–5.25 V - tightly regulated 5-V operation compatible with legacy TTL and FCT logic families |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - fully TTL-compatible, eliminating level-shifting needs |
| Ioff Current | ±1 µA at VCC = 0 V - ensures safe isolation during partial power-down |
| Output Termination | 25 Ω series resistor - reduces signal reflection noise on PCB traces without external components |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment |
Pinout & Package
Package: SOIC-20 (DW), 7.6 mm × 12.83 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low global control: drives all 8 outputs to high-Z when high |
| 2–9 (D0–D7) | Data Inputs | Edge-triggered D inputs; sampled on rising CP edge with 1.5 ns hold time |
| 10 (GND) | Ground Reference | Primary return path for logic and output current; decoupling required near pin |
| 11 (VCC) | Power Supply | +5 V supply; requires local 0.1 µF ceramic bypass capacitor |
| 12–19 (O0–O7) | 3-State Outputs | Non-inverting registered outputs; high-Z when OE = high |
| 20 (CP) | Clock Input | Buffered rising-edge trigger; 7 ns minimum pulse width required |
Key Features
| Feature | Design Value |
|---|---|
| Matched Rise/Fall Times | Ensures minimal skew between output transitions, reducing timing jitter in synchronous buses |
| 25-Ω Output Series Resistors | Integrates impedance matching directly at die, eliminating need for 8 discrete series resistors |
| Edge-Rate Controlled Outputs | Slows edge transitions just enough to suppress EMI without compromising 250-MHz switching rate |
| TTL-Compatible Input Levels | Accepts standard TTL VIH/VIL thresholds, enabling direct interfacing with legacy 74LS/74ALS devices |
| Ioff Partial-Power-Down Support | Allows safe insertion/removal in live backplanes by disabling outputs when VCC is unpowered |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module Bus Buffer |
|---|---|
Use Scenario: Synchronizing sensor data from multiple I/O modules onto a shared 8-bit data bus in programmable logic controllers. IC Role / Device Role / Timing Role: 8-bit registered latch providing setup/hold-compliant sampling of parallel inputs under centralized clock control. Use Value: Eliminates metastability risk via 2 ns setup/1.5 ns hold margin and prevents bus contention using 3-state outputs controlled by system OE signal. | Use Scenario: Isolating microcontroller GPIOs from noisy 12 V automotive bus lines while maintaining fast response for door lock and lighting control signals. IC Role / Device Role / Timing Role: Level-translating and noise-suppressing buffer with Ioff protection during ignition transients or battery disconnect events. Use Value: 25-Ω series termination reduces radiated emissions from long harness traces, and Ioff blocks reverse current when MCU is powered down but bus remains active. |
| Test Equipment Digital Pattern Generator | Legacy Computer Memory Expansion Card |
Use Scenario: Generating precise, glitch-free 8-bit stimulus patterns synchronized to a master timing engine in automated test systems. IC Role / Device Role / Timing Role: Edge-triggered register capturing pattern data on each clock cycle with deterministic 5.2 ns propagation delay. Use Value: Matched tPLH/tPHL ensures consistent edge alignment across all 8 bits, critical for setup/hold compliance in high-speed digital ATE. | Use Scenario: Latching address/data signals between ISA-bus peripherals and older x86 CPUs operating at 8 MHz. IC Role / Device Role / Timing Role: Bus-oriented octal register providing TTL-compatible drive strength and 3-state isolation during DMA cycles. Use Value: ±15 mA output sink/source meets original ISA spec requirements, and SOIC-20 footprint matches legacy board layouts. |
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 |
|---|---|---|---|
| CY74FCT2574ATQCT | QSOP-20 package, 6.5 ns max propagation delay, same electrical specs | Higher pin density; suited for space-constrained PCBs where SOIC-20 is too large | Select when board area is limited and reflow profile supports MSL Level-2 handling |
| SN74FCT574NSR | Same SOIC-20 footprint, identical pinout, but lacks integrated 25-Ω output resistors and edge-rate control | Requires external series resistors for noise suppression; higher EMI in high-speed routing | Choose only if cost sensitivity outweighs noise performance and layout simplicity |
Compared with CY74FCT2574ATQCT, CY74FCT2574CTSOCT offers tighter timing (5.2 ns vs. 6.5 ns) and SOIC packaging for easier hand-soldering and legacy compatibility; versus SN74FCT574NSR, it delivers superior signal integrity via on-die termination and edge shaping - reducing BOM count and improving EMC robustness.
Availability
CY74FCT2574CTSOCT is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and test equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for CY74FCT2574CTSOCT 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 integration.
The CY74FCT2574CTSOCT belongs to TI's FCT logic family - engineered for high-speed, low-noise 5-V digital interfacing in industrial and communications infrastructure where signal integrity and bus contention control are critical.
FAQ
What is the maximum clock frequency supported by CY74FCT2574CTSOCT?
CY74FCT2574CTSOCT supports a typical switching rate of 250 MHz, validated by its 5.2 ns maximum propagation delay (tPLH/tPHL) and 7 ns minimum clock pulse width (tw). This allows reliable operation in high-speed bus applications up to 200 MHz with standard PCB trace lengths and 50 pF load, assuming proper termination and decoupling per TI's layout guidelines.
Does CY74FCT2574CTSOCT require external pull-up or pull-down resistors on unused inputs?
Yes - per TI's recommended operating conditions, all unused inputs of CY74FCT2574CTSOCT must be held at VCC or GND to ensure predictable logic states and prevent increased ICC current or oscillation. Floating inputs can cause excessive power consumption and erratic behavior due to internal input hysteresis and noise susceptibility.
How does the Ioff feature of CY74FCT2574CTSOCT protect the device during partial power-down?
The Ioff feature in CY74FCT2574CTSOCT disables all outputs when VCC = 0 V, limiting leakage current to ±1 µA even with valid input/output voltages applied. This prevents damaging backflow current through the device during hot-swap or mixed-rail power sequencing - a requirement for systems like modular PLCs or telecom line cards where subsystems power up/down independently.
Can CY74FCT2574CTSOCT drive standard TTL loads directly?
Yes - CY74FCT2574CTSOCT provides ±15 mA output drive (12 mA sink, 15 mA source), exceeding standard TTL fan-out requirements. Its VOH (min 2.4 V at –15 mA) and VOL (max 0.55 V at 12 mA) meet TTL voltage thresholds, and its 4.75–5.25 V supply range aligns with legacy 5-V TTL systems, enabling direct interconnection without level shifters or buffers.
Is the pinout of CY74FCT2574CTSOCT compatible with CY74FCT574T-based designs?
Yes - CY74FCT2574CTSOCT is functionally and pinout-compatible with CY74FCT574T and other FCT-family octal D-type registers. Its SOIC-20 pin assignment (inputs on left, outputs on right) matches industry-standard layout conventions, allowing drop-in replacement in existing designs to improve noise performance via integrated 25-Ω termination and edge-rate control.
CY74FCT2574CTSOCT 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:
- 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-SOIC
CY74FCT2574CTSOCT FAQ
1.How can I place an order for CY74FCT2574CTSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2574CTSOCT 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 CY74FCT2574CTSOCT reliable?
The price and inventory of CY74FCT2574CTSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2574CTSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT2574CTSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2574CTSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2574CTSOCT?
CY74FCT2574CTSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2574CTSOCT 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 CY74FCT2574CTSOCT?
For technical support, including CY74FCT2574CTSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2574CTSOCT requirements.
6.How does Aetrix verify that CY74FCT2574CTSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT2574CTSOCT 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 CY74FCT2574CTSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT2574CTSOCT?
All CY74FCT2574CTSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2574CTSOCT, 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 CY74FCT2574CTSOCT part is unused and in its original packaging.
Return procedure for CY74FCT2574CTSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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