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Texas Instruments CY74FCT2244TSOC
- Part No.:
- CY74FCT2244TSOC
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT2244TSOC.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:825
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Product details
Overview
CY74FCT2244TSOC from Texas Instruments is an octal noninverting 3-state buffer/line driver with on-chip 25-Ω series output resistors, 6.5 ns max propagation delay, ±15 mA output drive, and Ioff partial-power-down support. It serves as a memory address driver, clock driver, or bus transmitter in TTL/CMOS/NMOS mixed-signal systems.
For engineers reviewing the CY74FCT2244TSOC datasheet, CY74FCT2244TSOC pinout, CY74FCT2244TSOC application, or CY74FCT2244TSOC equivalent, key selection criteria include 3-state bus isolation capability, integrated 25-Ω termination for reflection suppression, Ioff-enabled power sequencing, TTL-compatible input thresholds, and SOIC-20 package compatibility with legacy FCT logic designs.
Technical Context
This device implements dual independent 4-bit noninverting buffer sections (A- and B-side), each controlled by separate 3-state enable inputs (OEA and OEB). Its edge-rate control circuitry shapes output transitions to reduce EMI and overshoot without external components.
The integrated 25-Ω series resistors at each output terminal match typical PCB trace impedances, eliminating discrete termination and reducing board space. Ioff functionality ensures high-impedance outputs when VCC = 0 V, preventing backflow current during partial power-down sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | 6.5 ns max - enables reliable operation in 150 MHz bus systems with timing margin. |
| Output Drive (IOH/IOL) | –15 mA / +12 mA - sufficient to drive 50-Ω transmission lines or multiple TTL loads directly. |
| On-Chip Series Resistor | 25 Ω typ - matches common PCB trace impedance to suppress reflections without external components. |
| Ioff Current | ±1 µA at VCC = 0 V - prevents damaging backfeed current during hot-insertion or staggered power sequencing. |
| Input Voltage Thresholds | VIH = 2.0 V, VIL = 0.8 V - fully compatible with standard TTL logic levels without level-shifting. |
| Supply Voltage Range | 4.75 V to 5.25 V - tightly regulated 5-V operation with immunity to supply ripple up to ±2.5%. |
| ESD Protection | 2000-V HBM - exceeds JEDEC JESD22-A114A, supporting handling in standard assembly environments. |
Pinout & Package
Package: SOIC-20 (DW), 7.6 mm × 12.8 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, 2, 3, 4, 5, 6, 7, 8 | DA0–DA3, DB0–DB3 Inputs | A-side and B-side data inputs; TTL/CMOS-compatible with 0.8 V/2.0 V thresholds. |
| 9 | GND | Ground reference for all internal circuitry and output drivers. |
| 10 | VCC | 5-V power supply; decoupling required within 10 mm of pin per TI layout guidelines. |
| 11, 12, 13, 14, 15, 16, 17, 18 | OA0–OA3, OB0–OB3 Outputs | Noninverting 3-state outputs with integrated 25-Ω series resistors; drive capability ±12/15 mA. |
| 19 | OEB | B-side 3-state enable (active-low); controls OB0–OB3 outputs independently from A-side. |
| 20 | OEA | A-side 3-state enable (active-low); controls OA0–OA3 outputs independently from B-side. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω Output Resistors | Eliminates need for 16 discrete SMT resistors, reducing BOM count and PCB area in high-speed bus designs. |
| Edge-Rate Controlled Outputs | Reduces signal overshoot and ground bounce, enabling clean 100+ MHz clock distribution without added filtering. |
| Ioff Partial-Power-Down Support | Allows safe insertion/removal in live backplanes and enables power-gating of inactive subsystems without latch-up risk. |
| TTL-Compatible Input/Output Levels | Direct interface with legacy 74LS, 74ALS, and modern CMOS logic without level translators or pull-ups. |
| Function & Pinout Compatibility | Drop-in replacement for industry-standard FCT2244 logic family devices, preserving existing PCB layouts and firmware. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
|
Use Scenario: Driving 20-bit address buses between microcontrollers and SRAM/Flash memory in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address lines from memory array; enables multi-master arbitration via OEA/OEB control. Use Value: Integrated 25-Ω resistors suppress ringing on 10-cm traces, maintaining setup/hold margins across –40°C to 85°C industrial temperature range. |
Use Scenario: Bidirectional data buffering on RS-485 or CAN physical layer buses in factory automation nodes. IC Role / Device Role / Timing Role: Line driver/receiver interface translating MCU GPIO signals to robust differential bus levels; OEA/OEB coordinate direction control. Use Value: 6.5 ns propagation delay ensures <10 ns skew across all 8 bits, critical for deterministic 1 Mbps serial timing budgets. |
| Legacy System Clock Distribution | Test Equipment Signal Conditioning |
|
Use Scenario: Fan-out and impedance-matched distribution of 25 MHz system clocks to FPGA configuration interfaces and ADC sampling clocks. IC Role / Device Role / Timing Role: Low-skew clock buffer with 3-state disable; used to gate clock domains during power-state transitions. Use Value: Edge-rate control limits harmonic content above 500 MHz, easing EMC compliance in Class A test equipment enclosures. |
Use Scenario: Signal conditioning stage in automated test equipment (ATE) channel cards driving DUT interface cables. IC Role / Device Role / Timing Role: Level-shifting and bus-isolation buffer between controller ASIC and DUT pins; supports hot-swap calibration routines. Use Value: Ioff protection prevents backfeed into powered-down DUT sections, eliminating need for external blocking diodes or relays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT2244NSR | Same 6.5 ns speed grade and SOIC-20 package, but lacks integrated 25-Ω resistors and Ioff support. | Requires external series termination resistors; not suitable for partial-power-down systems. | Select only if board-level termination is already implemented and power sequencing is fixed. |
| 74AC244SCX | Higher 8 mA output drive, 10 ns propagation delay, no on-chip termination, and no Ioff. | Lower noise immunity on long traces; incompatible with hot-swap or staggered VCC architectures. | Choose only for cost-sensitive consumer applications where EMI and power sequencing are non-critical. |
Compared with SN74FCT2244NSR and 74AC244SCX, CY74FCT2244TSOC delivers unique value through its monolithic 25-Ω termination and Ioff-reducing component count by up to 16 parts and enabling safe operation in dynamically powered systems without redesigning layout or firmware.
Availability
CY74FCT2244TSOC is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-term lifecycle assurance, and drop-in compatibility with existing FCT logic designs.
Supply support for CY74FCT2244TSOC 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 ICs.
The CY74FCT2244TSOC belongs to TI's FCT logic family, engineered for interoperability with TTL systems while delivering lower power and enhanced noise immunity-targeting industrial control, instrumentation, and military-grade electronics.
FAQ
What is the maximum operating frequency supported by CY74FCT2244TSOC?
CY74FCT2244TSOC has a 6.5 ns maximum propagation delay, supporting reliable operation up to approximately 150 MHz in well-terminated 50-Ω systems. Actual usable frequency depends on trace length, load capacitance, and termination quality-TI recommends verifying timing margins using the switching characteristics table under worst-case VCC and temperature conditions.
Does CY74FCT2244TSOC require external pull-up or pull-down resistors on its enable inputs?
No, CY74FCT2244TSOC does not require external biasing on OEA or OEB. Its TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V) allow direct connection to microcontroller GPIOs or other logic outputs. TI specifies that unused inputs must be tied to VCC or GND-but enable pins are actively driven in normal operation and do not float.
Can CY74FCT2244TSOC be used with 3.3-V logic systems?
CY74FCT2244TSOC is specified only for 4.75 V–5.25 V operation and is not 3.3-V tolerant. Applying 3.3-V inputs may result in marginal VIH/VIL margins and undefined output behavior. For 3.3-V systems, TI recommends the SN74LVC244A or similar LVC-family buffers instead of CY74FCT2244TSOC.
How does the 25-Ω on-chip resistor in CY74FCT2244TSOC improve signal integrity?
The 25-Ω on-chip resistor in CY74FCT2244TSOC is placed in series with each output driver to match typical PCB trace impedances (50–75 Ω). This reduces signal reflections and standing waves, minimizing overshoot, undershoot, and jitter-especially on traces longer than 5 cm. It eliminates 16 discrete resistors, improving layout density and manufacturing yield.
Is CY74FCT2244TSOC pin-compatible with older 74F244 or 74LS244 devices?
CY74FCT2244TSOC is functionally and pinout-compatible with 74F244 and 74LS244 in SOIC-20 packages, sharing identical pin assignments for inputs, outputs, enables, VCC, and GND. However, it adds Ioff and edge-rate control not present in those legacy parts-so while it fits the same footprint, full benefit requires leveraging its advanced features in system design.
CY74FCT2244TSOC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 12mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CY74FCT2244TSOC FAQ
1.How can I place an order for CY74FCT2244TSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2244TSOC 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 CY74FCT2244TSOC reliable?
The price and inventory of CY74FCT2244TSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2244TSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT2244TSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2244TSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2244TSOC?
CY74FCT2244TSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2244TSOC 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 CY74FCT2244TSOC?
For technical support, including CY74FCT2244TSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2244TSOC requirements.
6.How does Aetrix verify that CY74FCT2244TSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT2244TSOC 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 CY74FCT2244TSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT2244TSOC?
All CY74FCT2244TSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2244TSOC, 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 CY74FCT2244TSOC part is unused and in its original packaging.
Return procedure for CY74FCT2244TSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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