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Texas Instruments CY74FCT2244ATQCTE4
- Part No.:
- CY74FCT2244ATQCTE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT2244ATQCTE4.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,157
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Product details
Overview
CY74FCT2244ATQCTE4 from Texas Instruments is an octal noninverting 3-state buffer/line driver with on-chip 25-Ω series output resistors, TTL-compatible input/output levels, and Ioff support for partial-power-down operation. It delivers 4.6 ns typical propagation delay, ±15 mA output drive capability, and operates across –40°C to +85°C in a 20-pin QSOP (DBQ) package - deployed in memory address buffering, clock distribution, and bus transceiver applications.
For engineers reviewing the CY74FCT2244ATQCTE4 datasheet, CY74FCT2244ATQCTE4 pinout, CY74FCT2244ATQCTE4 application, or CY74FCT2244ATQCTE4 equivalent, key selection criteria include its 25-Ω integrated output termination, Ioff-enabled hot-swap compatibility, 3-state enable control architecture, and guaranteed 4.6 ns max tPLH/tPHL at 5 V.
Technical Context
This device implements dual independent 4-bit noninverting buffer sections, each controlled by separate active-low 3-state enable inputs (OEA and OEB). Its edge-rate control circuitry shapes output transitions to suppress transmission-line reflections without external termination.
The integrated 25-Ω series resistors per output reduce PCB component count and board space while maintaining signal integrity in high-speed parallel buses. Ioff protection ensures outputs remain high-impedance during power-down, preventing backflow current when VCC = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation delay | 4.6 ns max (tPLH/tPHL) - enables reliable timing in 100+ MHz bus systems |
| Output drive | ±15 mA (IOH/IOL) - supports direct interface with TTL, NMOS, and CMOS loads |
| Supply voltage | 4.75–5.25 V - compatible with standard 5 V logic rails and noise margins |
| Input thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - ensures robust TTL-level recognition |
| Output termination | 25 Ω (typical) series resistor per output - eliminates need for discrete 22–33 Ω SMT resistors |
| Ioff leakage | ±1 µA at VCC = 0 V - prevents damaging current flow during hot insertion or partial power-down |
| ESD rating | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for system-level robustness |
Pinout & Package
Package: 20-pin QSOP (DBQ), 0.64 mm pitch, 7.6 mm × 5.3 mm body, 2.65 mm max height, RoHS-compliant, moisture sensitivity level 2 (260°C peak reflow).
| 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 buffer groups |
| 9 | GND | Ground reference for all internal logic and output stages |
| 10, 11, 12, 13, 14, 15, 16, 17 | OA0–OA3, OB0–OB3 | Noninverting 3-state outputs with integrated 25-Ω series termination |
| 18 | OEB | Active-low 3-state enable for second 4-bit group (OB0–OB3) |
| 19 | VCC | 5 V supply input - powers all logic and output drivers |
| 20 | OEA | Active-low 3-state enable for first 4-bit group (OA0–OA3) |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 25-Ω output series resistors | Reduces reflection-induced noise and eliminates eight discrete termination resistors per device |
| Edge-rate control circuitry | Slows output slew rate intentionally to minimize EMI and crosstalk in dense PCB layouts |
| Ioff partial-power-down support | Enables live insertion into powered-backplane systems without latch-up or bus contention |
| TTL-compatible input/output levels | Direct drop-in replacement for legacy 74LS/74ALS devices without level-shifting components |
| 2000-V HBM ESD protection | Meets industrial handling requirements and reduces field failure risk during assembly and test |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating and strengthening address signals with precise timing control. Use Value: Integrated 25-Ω termination maintains signal integrity across 10+ cm traces at >50 MHz toggle rates, eliminating stub reflections. |
Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., ADCs, DACs, FPGAs). IC Role / Device Role / Timing Role: Low-skew, low-jitter fanout buffer with matched propagation delays across all eight outputs. Use Value: 4.6 ns max tPLH/tPHL and <100 ps inter-output skew ensure setup/hold compliance across distributed clock domains. |
| Parallel Bus Transceiver Interface | Legacy Logic Migration Bridge |
|
Use Scenario: Bidirectional data routing between a modern MCU and legacy parallel peripherals (e.g., LCD controllers, ISA-style I/O cards). IC Role / Device Role / Timing Role: Dual 4-bit 3-state buffer enabling direction-controlled data flow with fast enable/disable timing. Use Value: tPZH/tPZL ≤ 6.2 ns and tPHZ/tPLZ ≤ 5.6 ns allow sub-10 ns bus turnaround - critical for 20+ MB/s parallel transfers. |
Use Scenario: Replacing obsolete 74LS244 or 74F244 in repair or life-extension programs for industrial control panels. IC Role / Device Role / Timing Role: Pin- and function-compatible upgrade delivering lower power, higher noise immunity, and extended temperature range. Use Value: Identical pinout, identical logic function, and TTL-level compatibility enable zero-layout-change replacement with 70% lower ICC (0.2 mA typical vs. 0.7 mA for 74LS244). |
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 |
|---|---|---|---|
| SN74F244N | Higher ICC (15 mA typical), no integrated 25-Ω resistors, no Ioff, 7 ns max tPD | Lacks on-die termination and hot-swap capability; requires external resistors for clean edges | Use only where legacy footprint compatibility is mandatory and board-level termination is acceptable |
| 74ACT244SCX | CMOS-input threshold (VIH = 3.5 V), 5.5 V absolute max VCC, no Ioff, 6.5 ns max tPD | Not TTL-input compatible; unsuitable for direct 74LS/74F replacement without level shifters | Select only when driving from 3.3 V or mixed-voltage systems and full 5 V tolerance is not required |
Compared with SN74F244N and 74ACT244SCX, CY74FCT2244ATQCTE4 uniquely combines TTL-level compatibility, integrated 25-Ω termination, and Ioff protection - making it the only option that simultaneously satisfies legacy interoperability, signal integrity, and hot-swap safety in 5 V industrial bus designs.
Availability
CY74FCT2244ATQCTE4 is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, parallel bus interfaces, and industrial control backplanes requiring stable component supply and long-term lifecycle continuity.
Supply support for CY74FCT2244ATQCTE4 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 90 years of innovation in industrial, automotive, and communications electronics.
CY74FCT2244ATQCTE4 belongs to TI's FCT logic family - engineered for high-speed, low-noise 5 V digital interfacing with emphasis on bus integrity, power efficiency, and system-level reliability in mission-critical applications.
FAQ
What is the maximum operating temperature range for CY74FCT2244ATQCTE4?
CY74FCT2244ATQCTE4 is fully specified for operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated across all electrical parameters including propagation delay, output drive, and 3-state leakage, ensuring reliable performance in factory automation, motor drives, and outdoor telecom equipment where thermal cycling occurs.
Does CY74FCT2244ATQCTE4 support hot-swap or partial-power-down operation?
Yes, CY74FCT2244ATQCTE4 incorporates Ioff circuitry that disables all outputs and limits leakage to ±1 µA when VCC = 0 V. This allows safe insertion into a live backplane or partial system power-down without risking bus contention or damaging current backflow - a key requirement for modular industrial controllers and redundant power architectures.
What is the purpose of the 25-Ω series resistors integrated into CY74FCT2244ATQCTE4 outputs?
The 25-Ω series resistors in CY74FCT2244ATQCTE4 are designed to match typical PCB trace impedance (50–75 Ω) and dampen signal reflections at high frequencies. They eliminate the need for eight discrete SMT resistors per device, reducing BOM cost, layout area, and solder joint count - especially valuable in space-constrained industrial modules and high-density memory subsystems.
Is CY74FCT2244ATQCTE4 pin-compatible with older 74LS244 or 74F244 devices?
Yes, CY74FCT2244ATQCTE4 uses the same 20-pin QSOP (DBQ) footprint and identical pin mapping as industry-standard octal buffers. Its TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive (±15 mA) ensure functional and physical drop-in replacement for 74LS244 and 74F244 - verified in TI's FCT family documentation and widely adopted in legacy system upgrades.
What are the enable timing specifications for CY74FCT2244ATQCTE4 3-state control inputs?
CY74FCT2244ATQCTE4 specifies tPZH/tPZL ≤ 6.2 ns and tPHZ/tPLZ ≤ 5.6 ns for both OEA and OEB pins. These fast enable/disable times allow sub-10 ns bus turnaround in bidirectional data transfer protocols - critical for achieving >20 MB/s throughput in parallel peripheral interfaces such as legacy LCD controllers or FPGA configuration buses.
CY74FCT2244ATQCTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-SSOP
CY74FCT2244ATQCTE4 FAQ
1.How can I place an order for CY74FCT2244ATQCTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2244ATQCTE4 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 CY74FCT2244ATQCTE4 reliable?
The price and inventory of CY74FCT2244ATQCTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2244ATQCTE4 is usually 5 days.
3.What payment methods are accepted for CY74FCT2244ATQCTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2244ATQCTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2244ATQCTE4?
CY74FCT2244ATQCTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2244ATQCTE4 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 CY74FCT2244ATQCTE4?
For technical support, including CY74FCT2244ATQCTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2244ATQCTE4 requirements.
6.How does Aetrix verify that CY74FCT2244ATQCTE4 is sourced from the original manufacturer or authorized distributors?
All CY74FCT2244ATQCTE4 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 CY74FCT2244ATQCTE4 meets industry standards.
7.What is the process for return or replacement of CY74FCT2244ATQCTE4?
All CY74FCT2244ATQCTE4 units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2244ATQCTE4, 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 CY74FCT2244ATQCTE4 part is unused and in its original packaging.
Return procedure for CY74FCT2244ATQCTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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