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Texas Instruments CY74FCT2244ATSOCT
- Part No.:
- CY74FCT2244ATSOCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT2244ATSOCT.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,395
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Product details
Overview
CY74FCT2244ATSOCT from Texas Instruments is an octal noninverting 3-state buffer/line driver with on-chip 25-Ω series output resistors, 4.6 ns maximum propagation delay (tPLH/tPHL), ±15 mA output drive capability, and Ioff partial-power-down support. It serves as a memory address driver, clock driver, or bus transmitter in TTL-compatible digital systems.
For engineers reviewing the CY74FCT2244ATSOCT datasheet, CY74FCT2244ATSOCT pinout, CY74FCT2244ATSOCT application, or CY74FCT2244ATSOCT equivalent, this page delivers verified functional identity, SOIC-20 package mapping, noise-suppressing edge-rate control, Ioff-enabled power sequencing, and direct TTL/NMOS/CMOS interface capability without external components.
Technical Context
The CY74FCT2244ATSOCT implements dual independent 4-bit noninverting buffers, each controlled by separate 3-state enable inputs (OEA and OEB). Its internal 25-Ω series termination at each output suppresses transmission-line reflections without requiring external resistors.
It features edge-rate control circuitry to reduce switching noise, supports Ioff for backflow prevention during partial power-down, and maintains full TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and output levels (VOH ≥ 2.4 V at –15 mA, VOL ≤ 0.55 V at 12 mA) across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | Max 4.6 ns (tPLH/tPHL); enables high-speed bus driving up to ~217 MHz data rate in clean transmission-line environments. |
| Output Drive | ±15 mA (IOH/–IOL); sufficient to directly drive 50-Ω transmission lines or multiple TTL loads without buffering. |
| Output Termination | 25 Ω (typical ROUT); integrated series resistor eliminates need for discrete termination, saving PCB area and BOM count. |
| Ioff Current | ±1 µA at VCC = 0 V; prevents damaging current flow from live buses into powered-down devices during hot-swap or power sequencing. |
| Supply Voltage | 4.75 V to 5.25 V; tightly regulated 5-V operation ensures compatibility with legacy TTL and mixed-voltage logic systems. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM; exceeds JEDEC 22 standards for robust handling in manufacturing and field environments. |
Pinout & Package
Package: SOIC-20 (DW package drawing), 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 | Data inputs for two independent 4-bit channels; accept TTL/NMOS/CMOS logic levels directly. |
| 9 | GND | Ground reference for all internal circuitry and output drivers. |
| 10, 11, 12, 13, 14, 15, 16, 17 | OA0–OA3, OB0–OB3 | Noninverting 3-state outputs with integrated 25-Ω series resistance; drive buses or transmission lines with minimal reflection. |
| 18 | VCC | 5-V supply input; must be decoupled locally per best practices for high-speed digital ICs. |
| 19, 20 | OEA, OEB | Active-low 3-state enable controls for Channel A (pins 10–13) and Channel B (pins 14–17); support independent channel gating. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 25-Ω output series resistors | Eliminates need for 16 discrete SMT resistors, reducing layout complexity and improving signal integrity on high-speed buses. |
| Edge-rate control circuitry | Reduces simultaneous switching noise (SSN) and EMI emissions compared to standard FCT or TTL drivers. |
| Ioff partial-power-down support | Enables safe insertion/removal in live backplanes or multi-rail systems where VCC may be sequenced independently. |
| TTL-compatible input/output levels | Direct interface with legacy 74LS, 74ALS, and modern CMOS logic without level-shifting circuitry or pull-ups. |
| Function and pinout compatibility | Drop-in replacement for industry-standard 74F244 and 74ACT244 in SOIC-20 footprint, simplifying design reuse and migration. |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or Flash memory in industrial control modules. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates CPU from memory during DMA cycles; dual enables allow interleaved access. Use Value: 4.6 ns propagation delay ensures setup/hold timing margins are maintained at 20-MHz bus clocks; 25-Ω termination minimizes address skew and glitches. |
Use Scenario: Distributing a 10–25 MHz system clock to multiple peripherals (UART, SPI, ADC) on a single PCB. IC Role / Device Role / Timing Role: Low-skew, impedance-matched line driver delivering clean clock edges to fan-out loads without overshoot or ringing. Use Value: Integrated 25-Ω series resistance matches typical PCB trace impedance, suppressing reflections that cause jitter or false triggering. |
| Legacy Bus Interface | Hot-Swappable Module Backplane |
|
Use Scenario: Interfacing ISA or LPC bus signals between x86 host and custom I/O daughterboard in test equipment. IC Role / Device Role / Timing Role: Bidirectional bus transceiver (with external direction control) providing level translation and drive strength boost. Use Value: ±15 mA drive sustains valid logic levels across long traces or high-capacitance connectors; TTL-compatible thresholds ensure interoperability. |
Use Scenario: Enabling hot-plug capability in modular PLC backplanes where modules power up/down asynchronously. IC Role / Device Role / Timing Role: Isolation buffer with Ioff protection prevents backfeeding from live backplane into unpowered module circuitry. Use Value: <1 µA Ioff current eliminates risk of latch-up or damage during insertion; dual OE pins support staggered enable sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F244N | Slower (10 ns max tPD), no on-chip termination, no Ioff, higher ICC (25 mA typical) | Lacks reflection suppression and partial-power-down; suitable only for low-frequency, non-hot-swap designs | Select when cost is primary constraint and board-level termination + power sequencing are already implemented. |
| 74ACT244SCX | Faster (3.5 ns max tPD), no integrated 25-Ω resistors, no Ioff, 5-V only, higher drive (±24 mA) | Better speed but requires external termination; not safe for partial-power-down scenarios | Choose for highest-speed point-to-point routing where layout allows discrete termination and full-power operation is guaranteed. |
Compared with SN74F244N and 74ACT244SCX, the CY74FCT2244ATSOCT uniquely combines sub-5 ns speed, built-in transmission-line matching, and Ioff safety-making it optimal for space-constrained, noise-sensitive, or hot-swap-capable industrial bus interfaces where reliability and layout simplicity are critical.
Availability
CY74FCT2244ATSOCT is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, legacy bus interfacing, and hot-swappable module backplanes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY74FCT2244ATSOCT 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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The CY74FCT2244ATSOCT belongs to TI's FCT logic family, engineered to replace bipolar TTL with CMOS efficiency while preserving pinout, voltage levels, and timing behavior-targeting cost-sensitive, noise-critical, and legacy-compatible digital systems.
FAQ
What is the maximum operating temperature range for CY74FCT2244ATSOCT?
The CY74FCT2244ATSOCT is fully specified for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in programmable logic controllers, motor drives, and outdoor instrumentation where thermal stability is essential. All electrical characteristics-including propagation delay, drive strength, and Ioff-are guaranteed across this full range.
Does CY74FCT2244ATSOCT require external pull-up or pull-down resistors on its inputs?
No, CY74FCT2244ATSOCT does not require external pull-up or pull-down resistors on its inputs. Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and low input leakage (±1 µA) ensure reliable logic recognition when driven directly by TTL, CMOS, or microcontroller GPIOs. Unused inputs should still be tied to VCC or GND per datasheet recommendation to prevent floating states.
How does the 25-Ω output series resistor in CY74FCT2244ATSOCT improve signal integrity?
The 25-Ω output series resistor in CY74FCT2244ATSOCT provides source termination matched to typical PCB trace impedances (50–75 Ω), significantly reducing signal reflections, overshoot, and ringing on transmission lines longer than ~1/6 wavelength of the fastest edge. This eliminates the need for 16 discrete SMT resistors, lowers BOM cost, and improves timing margin in high-speed address or clock distribution networks.
Can CY74FCT2244ATSOCT be used in hot-swap applications?
Yes, CY74FCT2244ATSOCT supports hot-swap applications via its Ioff feature. When VCC = 0 V, the device disables all outputs and limits Ioff current to ±1 µA-even with live bus voltages up to 4.5 V applied to outputs. This prevents damaging back-current flow into unpowered circuitry, making it suitable for modular backplanes, rack-mounted I/O systems, and field-replaceable units.
Is CY74FCT2244ATSOCT pin-compatible with standard 74-series octal buffers?
Yes, CY74FCT2244ATSOCT is functionally and pinout-compatible with 74F244 and 74ACT244 in the SOIC-20 (DW) package. Pin assignments for data inputs (DA0–DA3, DB0–DB3), outputs (OA0–OA3, OB0–OB3), enables (OEA, OEB), VCC, and GND match industry-standard layouts-enabling drop-in replacement without PCB redesign, provided the 4.6 ns speed grade and Ioff functionality meet system requirements.
CY74FCT2244ATSOCT 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
- 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
CY74FCT2244ATSOCT FAQ
1.How can I place an order for CY74FCT2244ATSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2244ATSOCT 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 CY74FCT2244ATSOCT reliable?
The price and inventory of CY74FCT2244ATSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2244ATSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT2244ATSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2244ATSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2244ATSOCT?
CY74FCT2244ATSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2244ATSOCT 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 CY74FCT2244ATSOCT?
For technical support, including CY74FCT2244ATSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2244ATSOCT requirements.
6.How does Aetrix verify that CY74FCT2244ATSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT2244ATSOCT 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 CY74FCT2244ATSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT2244ATSOCT?
All CY74FCT2244ATSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2244ATSOCT, 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 CY74FCT2244ATSOCT part is unused and in its original packaging.
Return procedure for CY74FCT2244ATSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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