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Texas Instruments CY74FCT244TSOCT
- Part No.:
- CY74FCT244TSOCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT244TSOCT.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,408
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Product details
Overview
CY74FCT244TSOCT from Texas Instruments is an octal 3-state buffer/line driver IC used for memory address driving, clock distribution, and bidirectional bus interfacing in TTL- and CMOS-compatible systems. It features 64-mA sink / 32-mA source drive strength, 6.5-ns maximum propagation delay (tPLH/tPHL), Ioff partial-power-down support, and edge-rate control for noise reduction.
For engineers reviewing the CY74FCT244TSOCT datasheet, CY74FCT244TSOCT pinout, CY74FCT244TSOCT application, or CY74FCT244TSOCT equivalent, this page delivers verified electrical specs, SOIC-20 package details, functional role in bus isolation, and validated alternative options for industrial control, legacy interface bridging, and embedded system signal conditioning.
Technical Context
The CY74FCT244TSOCT implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), supporting simultaneous or selective channel gating. Its FCT-family architecture provides TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and CMOS-level output swing (VOH = 2.4 V min at 32-mA sink), enabling direct interconnection with 5-V logic families without level-shifting components.
Edge-rate control circuitry limits slew rate to suppress simultaneous switching noise, while Ioff protection disables outputs and limits reverse current (<±1 µA) when VCC = 0 V-critical for hot-swap and partial-power-down operation. The device operates across –40°C to +85°C with 4.75–5.25 V supply tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - Ensures stable operation under industrial-grade 5-V rail variation without brownout or overvoltage stress. |
| Propagation Delay | ≤6.5 ns (tPLH/tPHL) - Enables reliable timing in high-speed address/data buses up to ~150 MHz system clock domains. |
| Output Drive | 64 mA sink / 32 mA source - Drives heavy capacitive loads (e.g., >100 pF traces or multiple TTL inputs) without signal degradation. |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents backfeed damage during power sequencing or board-level hot insertion. |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - Meets stringent industrial handling and assembly requirements without external protection. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Fully compatible with standard TTL logic levels, eliminating need for external biasing or translators. |
| Operating Temperature | –40°C to +85°C - Qualified for automotive under-hood, industrial PLC, and telecom infrastructure environments. |
Pinout & Package
Package: SOIC-20 (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1 (unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OEA) | Output Enable A | Active-low control for channels OA0–OA3; asserts 3-state when high, enables buffer when low. |
| 2–5 (DA0–DA3) | Data Inputs A | Noninverting inputs for first 4-bit buffer group; directly drive OA0–OA3 outputs. |
| 6–9 (OB0–OB3) | Outputs B | 3-state noninverting outputs for second 4-bit group, controlled by OEB (Pin 19). |
| 10 (GND) | Ground | Reference return for all logic and power paths; requires low-impedance PCB plane connection. |
| 11 (VCC) | Power Supply | +5 V supply pin; decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin. |
| 12 (OEB) | Output Enable B | Active-low control for channels OB0–OB3; independent of OEA for flexible bus partitioning. |
| 13–16 (OA0–OA3) | Outputs A | 3-state noninverting outputs for first 4-bit group; high-impedance when OEA = high. |
| 17–20 (DB0–DB3) | Data Inputs B | Noninverting inputs for second 4-bit group; feed OB0–OB3 outputs when OEB = low. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting dV/dt, improving signal integrity on dense PCBs. |
| Ioff partial-power-down | Enables safe operation during power sequencing or standby modes without damaging current flow into powered sections. |
| TTL/CMOS input compatibility | Accepts standard TTL VIH/VIL thresholds and drives CMOS loads to full rail, eliminating external level shifters. |
| Matched rise/fall times | Ensures symmetrical waveform edges (tPLH ≈ tPHL), minimizing duty-cycle distortion in clock distribution paths. |
| High noise immunity | 200-mV input hysteresis (Vhys) rejects transient coupling and improves robustness in electrically noisy environments. |
Applications
| Memory Address Buffering | Industrial Bus Isolation |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or EPROM devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer with independent 3-state enables (OEA/OEB) isolates memory banks during read/write cycles. Use Value: 64-mA sink capability ensures clean signal edges across 100+ pF trace + load capacitance; 6.5-ns delay preserves setup/hold timing margins. |
Use Scenario: Interfacing legacy 5-V parallel I/O ports (e.g., ISA bus peripherals) with modern MCU-based controllers. IC Role / Device Role / Timing Role: Bidirectional line driver providing direction-controlled signal translation between isolated subsystems. Use Value: Ioff protection prevents backfeed damage during hot-plug events; TTL-compatible inputs eliminate pull-up resistors. |
| Clock Distribution | Legacy System Signal Conditioning |
Use Scenario: Fan-out of a master system clock to multiple synchronous peripherals (ADCs, DACs, FPGAs) with matched skew. IC Role / Device Role / Timing Role: Low-skew, noninverting buffer with matched tPLH/tPHL delivering phase-aligned clock copies. Use Value: Matched rise/fall times and <6.5 ns propagation delay maintain <1 ns inter-channel skew across all 8 outputs. |
Use Scenario: Replacing obsolete 74LS244 in repair or redesign of industrial HMIs, CNC controllers, and test equipment. IC Role / Device Role / Timing Role: Pin- and function-compatible upgrade offering lower power, higher drive, and enhanced ESD robustness. Use Value: Direct drop-in replacement with identical SOIC-20 footprint and logic behavior; no PCB or firmware changes required. |
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 |
|---|---|---|---|
| SN74FCT244NSR | Same FCT family, identical SOIC-20 pinout, but rated for 0°C to 70°C only; 4.1-ns max delay (faster grade). | Suitable for commercial-grade systems where extended temperature range is not required. | Select SN74FCT244NSR if operating ambient stays within 0–70°C and sub-5 ns timing is needed. |
| 74ACT244SCX | Advanced CMOS (ACT) technology: 4.5–5.5 V supply, 24-mA drive, 7.5-ns max delay; no Ioff or edge-rate control. | Lacks partial-power-down support and noise-suppression features; lower drive strength. | Choose 74ACT244SCX only for cost-sensitive, non-hot-swap applications with light capacitive loads. |
Compared with SN74FCT244NSR and 74ACT244SCX, CY74FCT244TSOCT uniquely combines industrial temperature range (–40°C to +85°C), Ioff protection, edge-rate control, and 64-mA drive-making it optimal for ruggedized embedded and industrial control designs where reliability under power transients and noise is critical.
Availability
CY74FCT244TSOCT is available at Aetrix Electronics and suitable for industrial automation, legacy system upgrades, and embedded bus interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for CY74FCT244TSOCT 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 decades of high-reliability product heritage.
CY74FCT244TSOCT belongs to TI's FCT logic family, engineered for high-speed, low-noise 5-V digital interfacing in industrial, automotive, and communications systems where signal integrity and power sequencing robustness are essential.
FAQ
What is the maximum operating temperature range for CY74FCT244TSOCT?
CY74FCT244TSOCT is specified for continuous operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in programmable logic controllers, motor drives, and outdoor telecom equipment where thermal extremes are common. The SOIC-20 package's 58°C/W θJA enables adequate thermal dissipation under typical 5-V, low-duty-cycle conditions without forced airflow.
Does CY74FCT244TSOCT support partial-power-down mode?
Yes, CY74FCT244TSOCT includes Ioff circuitry that actively disables outputs and limits reverse current to ±1 µA when VCC = 0 V. This feature allows safe insertion or removal of the device in live backplane systems and supports controlled power sequencing in multi-rail embedded platforms-ensuring no damaging current flows into or out of powered downstream logic.
What is the output drive capability of CY74FCT244TSOCT?
CY74FCT244TSOCT delivers 64-mA sink current and 32-mA source current per output, significantly exceeding standard TTL (e.g., 74LS244's 8-mA sink). This enables direct driving of multiple TTL inputs, long PCB traces, or optocoupler LEDs without external buffers-reducing component count and improving system-level noise margin in high-capacitance bus environments.
Is CY74FCT244TSOCT pin-compatible with older 74LS244 devices?
CY74FCT244TSOCT uses the same SOIC-20 pinout and logic function as 74LS244, including identical OEA/OEB enable polarity and DA0–DA3/OA0–OA3 signal mapping. However, it offers superior electrical performance: higher drive strength, faster propagation (6.5 ns vs. 20+ ns), and built-in Ioff-making it a true functional and mechanical drop-in replacement for LS-based legacy upgrades.
How does the edge-rate control in CY74FCT244TSOCT improve system noise performance?
CY74FCT244TSOCT integrates internal edge-rate control that limits output slew rate, reducing high-frequency harmonic content and simultaneous switching noise (SSN). This minimizes crosstalk on adjacent traces and lowers radiated emissions-critical for meeting Class B EMC requirements in industrial control panels and medical instrumentation where signal integrity must be preserved across mixed-signal PCBs.
CY74FCT244TSOCT 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:
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CY74FCT244TSOCT FAQ
1.How can I place an order for CY74FCT244TSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT244TSOCT 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 CY74FCT244TSOCT reliable?
The price and inventory of CY74FCT244TSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT244TSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT244TSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT244TSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT244TSOCT?
CY74FCT244TSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT244TSOCT 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 CY74FCT244TSOCT?
For technical support, including CY74FCT244TSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT244TSOCT requirements.
6.How does Aetrix verify that CY74FCT244TSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT244TSOCT 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 CY74FCT244TSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT244TSOCT?
All CY74FCT244TSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT244TSOCT, 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 CY74FCT244TSOCT part is unused and in its original packaging.
Return procedure for CY74FCT244TSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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