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Texas Instruments CY74FCT244ATSOC
- Part No.:
- CY74FCT244ATSOC
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT244ATSOC.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,865
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Product details
Overview
CY74FCT244ATSOC from Texas Instruments is an octal 3-state noninverting buffer/line driver in SOIC-20 package, designed for memory address driving, clock distribution, and bus transceiver applications. It delivers 64-mA sink / 32-mA source output drive, 4.6 ns max propagation delay (tPLH/tPHL), operates from –40°C to +85°C, and supports partial-power-down via Ioff.
For engineers reviewing the CY74FCT244ATSOC datasheet, CY74FCT244ATSOC pinout, CY74FCT244ATSOC application, or CY74FCT244ATSOC equivalent, key selection criteria include TTL-compatible input/output levels, edge-rate controlled noise performance, Ioff-enabled power-down isolation, and SOIC-20 footprint compatibility with legacy FCT logic families.
Technical Context
This device implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), each gating four outputs (OA0–OA3 and OB0–OB3). Its CMOS input structure interfaces directly with TTL, NMOS, and CMOS logic without level-shifting components.
The internal edge-rate control circuitry limits slew rate to reduce simultaneous switching noise, while the Ioff feature disables all outputs when VCC = 0 V, preventing backflow current during partial system power-down - a critical requirement in hot-swap and mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - Ensures stable operation within industrial-grade 5-V supply tolerance. |
| Max Propagation Delay | 4.6 ns (tPLH/tPHL) - Enables high-speed bus buffering up to ~217 MHz data rate in clean load conditions. |
| Output Drive | 64 mA sink / 32 mA source - Sufficient to drive 50-Ω transmission lines or multiple TTL loads without external buffers. |
| Ioff Current | ±1 µA at VCC = 0 V - Guarantees safe isolation during partial power-down, protecting powered sections from backfeed. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets robustness requirements for manufacturing handling and board-level reliability. |
| Input Compatibility | TTL-level VIH = 2 V, VIL = 0.8 V - Direct interface with legacy 5-V TTL without pull-ups or level translators. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial environments including motor control, PLCs, and telecom infrastructure. |
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 floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 8, 12, 14, 16, 18 | Input (DA0–DA3, DB0–DB3) | Noninverting data inputs for two independent 4-bit channels. |
| 3, 5, 7, 9, 13, 15, 17, 19 | Output (OA0–OA3, OB0–OB3) | 3-state buffered outputs; high-impedance when respective OE is high. |
| 10 | GND | Ground reference for all logic and power domains. |
| 20 | VCC | 5-V supply rail; decoupling capacitor required near pin for noise suppression. |
| 11 | OEA | Active-low enable for OA0–OA3 outputs; asserts low to enable channel A. |
| 19 | OEB | Active-low enable for OB0–OB3 outputs; asserts low to enable channel B. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting dV/dt - critical for signal integrity in dense PCB layouts. |
| Ioff partial-power-down support | Prevents damaging current flow between powered and unpowered system sections during hot insertion or staged boot. |
| Matched rise/fall times | Ensures symmetrical waveform edges, minimizing duty-cycle distortion in clock distribution paths. |
| TTL-compatible input thresholds | Eliminates need for external biasing or level shifters when interfacing with legacy 5-V logic families. |
| 3.3-V typical VOH | Provides margin for downstream 3.3-V CMOS inputs while maintaining full 5-V noise immunity on the same bus. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
Use Scenario: Driving 20-bit address bus from microcontroller to SRAM or Flash memory in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting buffer with dual-enable control isolates CPU from memory loading; 4.6 ns delay ensures setup/hold timing compliance at 20-MHz bus speeds. Use Value: Eliminates address skew across parallel lines and sustains signal integrity over 10-cm traces on 4-layer industrial PCBs. |
Use Scenario: Bidirectional data transfer between FPGA and legacy ISA-style peripheral cards in test equipment racks. IC Role / Device Role / Timing Role: Dual-channel 3-state line driver/receiver manages direction control via OEA/OEB; Ioff prevents backfeed when card is hot-swapped. Use Value: Enables plug-and-play expansion without system reset; edge-rate control suppresses crosstalk in shared backplane stubs. |
| Clock Distribution Network | Automated Test Equipment (ATE) |
Use Scenario: Fan-out of 5-MHz system clock to eight synchronous ADCs in data acquisition modules. IC Role / Device Role / Timing Role: Low-skew buffer replicates clock with matched tPLH/tPHL; 3.3-V VOH meets ADC input threshold while preserving 5-V noise margin. Use Value: Maintains <100-ps inter-channel skew across all eight outputs, ensuring sub-ns sampling alignment. |
Use Scenario: Signal conditioning and level translation between 5-V DUT interface and 3.3-V controller in boundary-scan test fixtures. IC Role / Device Role / Timing Role: Acts as voltage-tolerant bus isolator; TTL-compatible inputs accept open-collector DUT signals; 3-state outputs prevent contention during test vector changes. Use Value: Reduces fixture design complexity by eliminating discrete pull-up networks and enabling dynamic bus reconfiguration. |
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 |
|---|---|---|---|
| SN74FCT244ATPWR | Same SOIC-20 package, identical electrical specs, but TI's newer marking and tape-and-reel packaging (2000 pcs/reel vs. 25 pcs/tube). | No functional difference; optimized for automated SMT assembly rather than manual prototyping. | Select SN74FCT244ATPWR for high-volume production; CY74FCT244ATSOC remains preferred for low-quantity evaluation or repair. |
| 74ACT244SCX | Higher drive (24 mA source / 24 mA sink), slower speed (10 ns max delay), no Ioff or edge-rate control. | Lacks partial-power-down capability and noise mitigation - unsuitable for hot-swap or high-density routing. | Choose only if cost sensitivity outweighs noise and power-down requirements; verify layout margins for SSN. |
Compared with SN74FCT244ATPWR and 74ACT244SCX, CY74FCT244ATSOC provides superior noise immunity via edge-rate control and guaranteed Ioff isolation - essential for industrial systems requiring field-replaceable modules and mixed-voltage interoperability.
Availability
CY74FCT244ATSOC is available at Aetrix Electronics and suitable for industrial control systems, automated test equipment, and legacy bus interface designs requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for CY74FCT244ATSOC 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 connectivity solutions for industrial, automotive, and communications markets.
CY74FCT244ATSOC belongs to the FCT logic family - engineered for high-speed, low-noise 5-V TTL-compatible interfacing with enhanced power-down safety and backward compatibility to legacy bipolar logic.
FAQ
What is the maximum operating temperature range for CY74FCT244ATSOC?
CY74FCT244ATSOC is rated for continuous operation from –40°C to +85°C ambient temperature. This industrial-grade thermal specification ensures reliable performance in programmable logic controllers, motor drives, and outdoor telecom enclosures where ambient temperatures exceed commercial-grade limits. The SOIC-20 package's 58°C/W θJA enables adequate thermal dissipation under typical 10-mA average load conditions.
Does CY74FCT244ATSOC support partial-power-down mode?
Yes, CY74FCT244ATSOC supports partial-power-down mode via its Ioff feature. When VCC = 0 V, the outputs enter high-impedance state with leakage current limited to ±1 µA, preventing damaging current backflow from powered system sections into the unpowered IC. This capability is explicitly verified per JESD78 and is critical for hot-swap applications and multi-rail power sequencing.
What is the propagation delay of CY74FCT244ATSOC at 5 V supply?
CY74FCT244ATSOC has a maximum propagation delay (tPLH/tPHL) of 4.6 ns at VCC = 4.75 V to 5.25 V, TA = –40°C to +85°C, with CL = 50 pF and RL = 500 Ω. This value is measured from input transition (50% point) to output transition (50% point) under standard load conditions defined in TI's SCCS071 datasheet - enabling reliable timing closure in 20-MHz synchronous bus designs.
Can CY74FCT244ATSOC drive TTL loads directly?
Yes, CY74FCT244ATSOC is fully compatible with TTL input and output logic levels. Its VIH = 2 V and VIL = 0.8 V thresholds match standard TTL, and its 64-mA sink / 32-mA source drive exceeds TTL's 16-mA sink requirement. No external pull-ups or level shifters are needed when interfacing with 74LS, 74ALS, or other 5-V TTL families - simplifying legacy system upgrades.
What package type is used for CY74FCT244ATSOC?
CY74FCT244ATSOC uses the SOIC-20 (DW) package: 7.5 mm × 12.8 mm body, 1.27 mm lead pitch, 2.65 mm max height, with NiPdAu lead finish and MSL Level-1 rating. This surface-mount package is compatible with standard reflow profiles (peak 260°C), supports automated placement, and maintains pinout compatibility with industry-standard 20-pin SOIC footprints used across FCT, LS, and ACT logic families.
CY74FCT244ATSOC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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
CY74FCT244ATSOC FAQ
1.How can I place an order for CY74FCT244ATSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT244ATSOC 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 CY74FCT244ATSOC reliable?
The price and inventory of CY74FCT244ATSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT244ATSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT244ATSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT244ATSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT244ATSOC?
CY74FCT244ATSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT244ATSOC 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 CY74FCT244ATSOC?
For technical support, including CY74FCT244ATSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT244ATSOC requirements.
6.How does Aetrix verify that CY74FCT244ATSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT244ATSOC 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 CY74FCT244ATSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT244ATSOC?
All CY74FCT244ATSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT244ATSOC, 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 CY74FCT244ATSOC part is unused and in its original packaging.
Return procedure for CY74FCT244ATSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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