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Texas Instruments CY74FCT2244ATQCT
- Part No.:
- CY74FCT2244ATQCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT2244ATQCT.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,748
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Product details
Overview
CY74FCT2244ATQCT 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, 4.6 ns maximum propagation delay at 5 V, ±15 mA output drive capability, and Ioff support for partial-power-down operation. It serves as a memory address driver, clock distribution buffer, or bus transceiver in high-speed digital systems.
For engineers reviewing the CY74FCT2244ATQCT datasheet, CY74FCT2244ATQCT pinout, CY74FCT2244ATQCT application, or CY74FCT2244ATQCT equivalent, key selection criteria include its 20-pin QSOP package, 3-state enable control per group, integrated termination for reflection suppression, and compatibility with TTL, CMOS, and NMOS logic families without external components.
Technical Context
This device implements dual 4-bit noninverting buffers with independent 3-state outputs (OEA/OEB), each driving four outputs with edge-rate control circuitry to reduce EMI and transmission-line noise. The internal 25-Ω series resistors are placed directly at each output terminal, eliminating discrete termination components and minimizing PCB trace discontinuities.
It operates over –40°C to +85°C with 4.75–5.25 V supply, supports Ioff to block current flow during power-down, and meets JESD22 ESD ratings including 2000-V HBM. Input thresholds align with TTL (VIL ≤ 0.8 V, VIH ≥ 2.0 V), ensuring robust interfacing across legacy and mixed-logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | Max 4.6 ns (tPLH/tPHL) at VCC = 5 V - enables reliable operation in 100+ MHz bus systems with tight timing margins. |
| Output Drive | ±15 mA (IOH/IOL) - sustains signal integrity across loaded backplanes or long traces without external drivers. |
| On-Chip Termination | 25 Ω series resistor per output - reduces reflections and ringing on controlled-impedance lines, eliminating 8 discrete resistors. |
| Ioff Support | ±1 µA max Ioff at VCC = 0 V - prevents backflow current during hot-swap or partial power-down, protecting upstream logic. |
| Logic Compatibility | TTL-input and TTL-output voltage levels - interoperates directly with 74LS, 74ALS, and standard CMOS without level shifters. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC requirements for industrial board handling and assembly environments. |
| Supply Range | 4.75–5.25 V - tightly regulated 5 V rail operation with <±5% tolerance, compatible with standard linear regulators and LDOs. |
Pinout & Package
Package: 20-pin QSOP (SSOP), DBQ drawing, 0.65 mm pitch, 7.4–7.6 mm width, 12.6–13.0 mm length, 2.65 mm max height. RoHS-compliant, NIPDAU finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | DA0–DA3 (Data Inputs A) | Noninverting inputs for first 4-bit buffer group; driven by system address/data bus or control signals. |
| 5, 6, 7, 8 | DB0–DB3 (Data Inputs B) | Noninverting inputs for second 4-bit buffer group; enables independent data path routing or dual-bus isolation. |
| 9 | GND | Ground reference for all internal circuitry and output termination; must be low-inductance connection. |
| 10, 11, 12, 13 | OA0–OA3 (Outputs A) | 3-state noninverting outputs with 25-Ω series resistor; active when OEA = L, high-Z when OEA = H. |
| 14, 15, 16, 17 | OB0–OB3 (Outputs B) | 3-state noninverting outputs with 25-Ω series resistor; active when OEB = L, high-Z when OEB = H. |
| 18 | OEB | Active-low 3-state enable for OB0–OB3; allows independent control of second buffer group for time-multiplexed bus use. |
| 19 | OEA | Active-low 3-state enable for OA0–OA3; used with OEB to partition bus segments or implement direction-controlled transceivers. |
| 20 | VCC | +5 V supply input; requires local 0.1 µF ceramic decoupling adjacent to pin for stable high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω Output Series Resistors | Eliminates need for 8 external termination resistors, reducing BOM count, PCB area, and impedance mismatch risk. |
| Dual Independent 3-State Enables (OEA/OEB) | Enables flexible bus arbitration: one group drives while other is high-Z, supporting bidirectional or split-bus topologies. |
| Edge-Rate Controlled Outputs | Slower rise/fall times than standard FCT reduce broadband EMI and crosstalk in dense layouts without sacrificing speed. |
| Ioff Partial-Power-Down Protection | Prevents damaging current flow from live bus lines into unpowered device, critical for hot-plug and modular backplane designs. |
| TTL-Compatible Voltage Thresholds | VIH ≥ 2.0 V and VIL ≤ 0.8 V ensure noise-immune interfacing with legacy TTL, LS, and ALS families without pull-ups or translators. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or Flash memory in embedded control systems. 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 compliance at 20+ MHz bus clocks; on-chip 25-Ω resistors suppress ringing on 50-Ω traces. |
Use Scenario: Bidirectional data buffering between PLC CPU and field I/O modules over extended RS-485 or parallel backplane. IC Role / Device Role / Timing Role: Dual-group 3-state driver manages direction control and signal integrity on shared data lanes. Use Value: Ioff protection prevents latch-up when I/O modules power up/down independently; TTL-level compatibility avoids level-shifter ICs. |
| Clock Distribution Network | Legacy System Logic Interface |
|
Use Scenario: Fan-out and impedance-matched distribution of 50-MHz system clock to multiple FPGA configuration pins and peripheral ICs. IC Role / Device Role / Timing Role: Low-skew, terminated line driver maintaining signal fidelity across 10+ cm PCB traces. Use Value: 25-Ω series termination matches typical FR-4 trace impedance, reducing overshoot and jitter accumulation in multi-load networks. |
Use Scenario: Interfacing modern microcontrollers with legacy 74LS-based peripheral cards in test equipment or avionics upgrades. IC Role / Device Role / Timing Role: Voltage- and timing-transparent bridge replacing obsolete 74LS244 with identical pinout and logic behavior. Use Value: Identical TTL input thresholds and 15-mA drive match LS family loading; 4.6 ns delay meets or exceeds LS244 performance. |
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 |
|---|---|---|---|
| SN74FCT2244ATSOCT | Same electrical specs and pinout, but in SOIC-20 (DW) package instead of QSOP-20 (DBQ); thermal resistance θJA = 58°C/W vs. 68°C/W. | Preferred where board space permits larger SOIC footprint and hand-soldering or legacy reflow profiles are used. | Select SN74FCT2244ATSOCT if PCB layout accommodates wider SOIC body and higher thermal mass improves reliability under sustained load. |
| 74AC244SCX | CMOS-based, 3.3 V only, no built-in termination, 6.5 ns max tPD, ±24 mA drive; lacks Ioff and HBM ESD rating. | Suitable for low-voltage, low-noise applications but requires external 33-Ω series resistors and cannot support partial power-down. | Choose 74AC244SCX only in new 3.3 V-only designs with full power domain control; avoid in mixed-voltage or hot-swap systems. |
Compared with CY74FCT2244ATQCT, SN74FCT2244ATSOCT offers better thermal performance in SOIC but occupies more PCB area, while 74AC244SCX provides higher drive strength at lower voltage yet adds design complexity through external termination and lacks Ioff safety.
Availability
CY74FCT2244ATQCT is available at Aetrix Electronics and suitable for industrial automation controllers, embedded memory subsystems, and legacy-system upgrade programs requiring stable component supply and long-term obsolescence management.
Supply support for CY74FCT2244ATQCT 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 logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The CY74FCT2244ATQCT belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible interface bridging in mission-critical industrial, telecom, and computing infrastructure.
FAQ
What is the maximum operating temperature range for CY74FCT2244ATQCT?
The CY74FCT2244ATQCT is rated for continuous operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and supports deployment in industrial enclosures, automotive under-hood auxiliary systems, and outdoor communications equipment without derating.
Does CY74FCT2244ATQCT require external pull-up or pull-down resistors on its enable pins?
No, CY74FCT2244ATQCT does not require external pull-up or pull-down resistors on OEA or OEB. Its TTL-compatible inputs have defined thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and all unused inputs must be tied to VCC or GND per datasheet Note 2 - direct connection suffices without resistive biasing.
Can CY74FCT2244ATQCT be used with a 3.3 V supply?
No, CY74FCT2244ATQCT is specified only for 4.75–5.25 V operation. Applying 3.3 V violates recommended operating conditions and results in undefined logic thresholds, degraded noise margins, and unreliable 3-state control - use 74AC244 or 74LVC244 for 3.3 V systems.
How does the 25-Ω on-chip resistor in CY74FCT2244ATQCT improve signal integrity?
The 25-Ω series resistor in CY74FCT2244ATQCT is placed directly at each output pin to dampen signal reflections on PCB traces with characteristic impedance near 50 Ω. This reduces overshoot, undershoot, and ringing without requiring external components, preserving timing margins in high-speed address or data buses.
Is CY74FCT2244ATQCT pin-compatible with the original 74LS244?
Yes, CY74FCT2244ATQCT is functionally and pin-compatible with 74LS244 in the same 20-pin package, sharing identical pin assignments for inputs, outputs, enables, VCC, and GND. However, it delivers faster timing (4.6 ns vs. 15–20 ns), higher drive (±15 mA vs. ±8 mA), and added features like Ioff and on-chip termination.
CY74FCT2244ATQCT 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:
- 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:
- 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
CY74FCT2244ATQCT FAQ
1.How can I place an order for CY74FCT2244ATQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2244ATQCT 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 CY74FCT2244ATQCT reliable?
The price and inventory of CY74FCT2244ATQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2244ATQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT2244ATQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2244ATQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2244ATQCT?
CY74FCT2244ATQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2244ATQCT 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 CY74FCT2244ATQCT?
For technical support, including CY74FCT2244ATQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2244ATQCT requirements.
6.How does Aetrix verify that CY74FCT2244ATQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT2244ATQCT 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 CY74FCT2244ATQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT2244ATQCT?
All CY74FCT2244ATQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2244ATQCT, 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 CY74FCT2244ATQCT part is unused and in its original packaging.
Return procedure for CY74FCT2244ATQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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