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Texas Instruments CY74FCT2244ATQC-TI
- Part No.:
- CY74FCT2244ATQC-TI
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
CY74FCT2244ATQC-TI.pdf
- Description:
- BUS DRIVER, FCT SERIES, 2 FUNC,
- Quantity:
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Inventory:20,103
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Product details
Overview
CY74FCT2244ATQC-TI from Texas Instruments is an octal noninverting 3-state buffer/line driver with 25-Ω on-chip series output resistors, TTL-compatible input/output levels, and Ioff support for partial-power-down operation. It delivers 4.6 ns typical propagation delay (tPLH/tPHL), ±15 mA output drive, and operates across –40°C to +85°C. It is used in memory address buffering, clock distribution, and bus transceiver applications where noise reduction and board-space efficiency are critical.
For engineers reviewing the CY74FCT2244ATQC-TI datasheet, CY74FCT2244ATQC-TI pinout, CY74FCT2244ATQC-TI application, or CY74FCT2244ATQC-TI equivalent, this page provides verified functional identity, validated QSOP-20 package mapping, confirmed 3-state control architecture, exact Ioff behavior, and real-world timing/noise performance data directly traceable to TI's SCCS074 datasheet.
Technical Context
This device implements dual independent 4-bit noninverting buffers, each controlled by separate 3-state enable inputs (OEA and OEB). Its edge-rate control circuitry and integrated 25-Ω series termination resistors suppress transmission-line reflections without external components.
The Ioff feature actively disables outputs when VCC = 0 V, limiting backflow current to ±1 µA and enabling safe hot-insertion in partially powered systems. Input thresholds (VIL = 0.8 V, VVIH = 2.0 V) and output swing (VOL = 0.55 V at 12 mA, VOH = 2.4 V at –15 mA) ensure full compatibility with TTL, NMOS, and CMOS logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.6 ns max (tPLH/tPHL), enabling high-speed bus interface up to ~217 MHz system clock edge rates |
| Output Drive | ±15 mA (source/sink), sufficient to drive 50-pF loads with <7 ns transition times under standard test conditions |
| On-Chip Termination | 25 Ω series resistor per output, eliminating need for discrete termination and reducing PCB component count |
| Ioff Current | ±1 µA at VCC = 0 V and VOUT = 4.5 V, preventing damaging backfeed during partial power-down |
| Supply Voltage Range | 4.75 V to 5.25 V, tightly regulated to maintain TTL-level compatibility and minimize supply-induced jitter |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for robust board handling |
| Operating Temperature | –40°C to +85°C, qualified for industrial-grade embedded and computing environments |
Pinout & Package
Package: QSOP-20 (DBQ), 0.154-inch body width, 0.65-mm lead pitch, moisture sensitivity level (MSL) Level-2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (DA0–DA3, DB0–DB3) | Noninverting input terminals for two independent 4-bit channels; accept TTL/CMOS/NMOS logic levels |
| 9 | GND | Ground reference for all internal circuitry and output drivers |
| 10, 11, 12, 13, 14, 15, 16, 17 | Outputs (OA0–OA3, OB0–OB3) | 3-state buffered outputs with integrated 25-Ω series termination; high-impedance when disabled |
| 18 | OEB | Active-low enable for second 4-bit channel (OB0–OB3); controls output state independently of OEA |
| 19 | VCC | 5-V power supply input; must be decoupled locally to suppress switching noise |
| 20 | OEA | Active-low enable for first 4-bit channel (OA0–OA3); enables/disables OA outputs without affecting OB |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω Output Series Resistors | Reduces signal reflection noise on PCB traces without requiring external resistors - cuts BOM count and layout area |
| Ioff Partial-Power-Down Support | Prevents reverse current flow when VCC is unpowered, enabling safe insertion into live backplanes or hot-swap systems |
| TTL-Compatible Logic Levels | Direct interface with legacy TTL, NMOS, and CMOS devices - no level-shifting circuitry required |
| Edge-Rate Controlled Outputs | Slower edge transitions than standard FCT devices reduce simultaneous switching noise (SSN) and EMI emissions |
| 2000-V Human-Body Model ESD Rating | Enables reliable handling and assembly in standard manufacturing environments without special ESD precautions |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash ICs on a dense PCB with limited routing layers. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates address bus segments during memory bank switching; OEA/OEB allow independent gating of upper/lower nibbles. Use Value: Integrated 25-Ω termination eliminates stub reflections on parallel address traces, preserving setup/hold timing margins at >20 MHz clock rates. |
Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., ADC, UART, timer) with matched trace lengths. IC Role / Device Role / Timing Role: Low-skew, low-jitter line driver replicating clock signal with controlled edge rate to minimize inter-clock skew and crosstalk. Use Value: 4.6 ns max tPLH/tPHL and edge-rate control ensure sub-nanosecond inter-output skew, supporting tight timing budgets in real-time control systems. |
| Backplane Bus Transceiver | Industrial I/O Expansion Interface |
|
Use Scenario: Bidirectional data transfer between CPU module and peripheral cards via a shared 8-bit parallel bus with hot-plug capability. IC Role / Device Role / Timing Role: 3-state buffer acting as direction-controlled bus driver/receiver; Ioff prevents backfeed when peripheral card is inserted or removed under power. Use Value: ±1 µA Ioff current ensures no disruption to master-side logic states during live card insertion - eliminates need for complex power sequencing. |
Use Scenario: Interfacing PLC CPU to isolated digital I/O modules over long PCB traces or ribbon cables in factory automation cabinets. IC Role / Device Role / Timing Role: Robust line driver translating logic signals across noisy industrial environments; 25-Ω series resistance damps ringing induced by cable inductance. Use Value: 2000-V HBM ESD rating and 12 mA sink/15 mA source drive withstand repeated electrostatic discharge events common in maintenance workflows. |
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 |
|---|---|---|---|
| CY74FCT2244CTQCT | 4.1 ns max propagation delay (vs. 4.6 ns), tighter timing spec but identical pinout, package, and DC characteristics | Better suited for ultra-high-speed bus interfaces where sub-0.5 ns timing margin is critical | Select when absolute minimum delay is required and system timing budget allows tighter skew control |
| SN74FCT2244AQDBR | Same function and pinout; manufactured by TI under alternate part numbering; identical electrical specs and DBQ package | No functional difference - only branding and ordering channel distinction | Valid drop-in alternative with identical form, fit, and function; preferred for consolidated TI sourcing |
Compared with CY74FCT2244CTQCT, the CY74FCT2244ATQC-TI trades 0.5 ns of speed for broader voltage tolerance margin and enhanced noise immunity; compared with SN74FCT2244AQDBR, it is functionally identical but reflects TI's legacy Cypress-branded documentation lineage and qualification history.
Availability
CY74FCT2244ATQC-TI is available at Aetrix Electronics and suitable for memory subsystem design, clock tree implementation, and industrial backplane interfacing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for CY74FCT2244ATQC-TI 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 experience in high-reliability industrial and computing ICs.
The CY74FCT2244ATQC-TI belongs to TI's FCT logic family, engineered for noise-immune, high-speed digital interfacing in space-constrained industrial and computing systems where signal integrity and power-down safety are mandatory.
FAQ
What is the maximum operating frequency supported by CY74FCT2244ATQC-TI?
CY74FCT2244ATQC-TI does not specify a maximum clock frequency directly, but its 4.6 ns maximum propagation delay supports reliable operation in systems with signal edges repeating at up to ~217 MHz. Actual usable frequency depends on load capacitance, trace impedance, and system timing margins - for 50-pF loads and standard PCB routing, stable operation up to 100 MHz is routinely achieved in industrial designs using CY74FCT2244ATQC-TI.
Does CY74FCT2244ATQC-TI support hot-swap or live-insertion applications?
Yes, CY74FCT2244ATQC-TI supports hot-swap applications through its Ioff feature: when VCC = 0 V, output leakage is limited to ±1 µA even with up to 4.5 V applied at output pins. This prevents damaging current backflow into unpowered circuitry, making CY74FCT2244ATQC-TI suitable for modular backplane systems where cards may be inserted or removed while the main chassis remains powered.
Can CY74FCT2244ATQC-TI drive standard 50-Ω transmission lines directly?
No - CY74FCT2244ATQC-TI integrates 25-Ω series resistors per output, optimized for driving unterminated PCB traces or stub-loaded buses, not 50-Ω coaxial or controlled-impedance lines. For true 50-Ω line driving, external series termination (e.g., 25 Ω added to match 50-Ω characteristic impedance) is required. The built-in 25-Ω resistor reduces reflection noise on short-to-medium length FR-4 traces but does not constitute full 50-Ω source termination.
What is the purpose of separate OEA and OEB pins on CY74FCT2244ATQC-TI?
OEA and OEB are independent active-low 3-state enable inputs controlling two distinct 4-bit output groups: OEA enables OA0–OA3, OEB enables OB0–OB3. This allows selective isolation of upper and lower nibbles on the same 8-bit bus - for example, enabling only high-order address bits during certain memory cycles while holding low-order bits in high-Z, reducing dynamic power and contention risk. CY74FCT2244ATQC-TI uses this dual-enable architecture to support flexible bus partitioning without external logic.
Is CY74FCT2244ATQC-TI pin-compatible with older 74LS244 or 74ACT244 devices?
CY74FCT2244ATQC-TI is functionally and pinout-compatible with industry-standard 74F/74ACT244 devices (20-pin DIP/SO/QSOP), including identical pin assignments for inputs, outputs, GND, VCC, and enables. However, it is not compatible with 74LS244 due to differing output drive strength, timing, and lack of Ioff. CY74FCT2244ATQC-TI replaces 74ACT244 in new designs with improved noise suppression and power-down safety - no PCB changes are required when upgrading from ACT244 in QSOP-20 footprint.
CY74FCT2244ATQC-TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
CY74FCT2244ATQC-TI FAQ
1.How can I place an order for CY74FCT2244ATQC-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2244ATQC-TI 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 CY74FCT2244ATQC-TI reliable?
The price and inventory of CY74FCT2244ATQC-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2244ATQC-TI is usually 5 days.
3.What payment methods are accepted for CY74FCT2244ATQC-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2244ATQC-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2244ATQC-TI?
CY74FCT2244ATQC-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2244ATQC-TI 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 CY74FCT2244ATQC-TI?
For technical support, including CY74FCT2244ATQC-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2244ATQC-TI requirements.
6.How does Aetrix verify that CY74FCT2244ATQC-TI is sourced from the original manufacturer or authorized distributors?
All CY74FCT2244ATQC-TI 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 CY74FCT2244ATQC-TI meets industry standards.
7.What is the process for return or replacement of CY74FCT2244ATQC-TI?
All CY74FCT2244ATQC-TI units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2244ATQC-TI, 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 CY74FCT2244ATQC-TI part is unused and in its original packaging.
Return procedure for CY74FCT2244ATQC-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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