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Texas Instruments CY74FCT2244TQCT
- Part No.:
- CY74FCT2244TQCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT2244TQCT.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,137
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Product details
Overview
CY74FCT2244TQCT from Texas Instruments is an octal noninverting 3-state buffer/line driver with on-chip 25-Ω series output resistors, 6.5 ns max propagation delay at 5 V, ±15 mA output drive, and Ioff support for partial-power-down operation. It serves as a memory address driver, clock driver, or bus transceiver in TTL/CMOS/NMOS mixed-signal systems.
For engineers reviewing the CY74FCT2244TQCT datasheet, CY74FCT2244TQCT pinout, CY74FCT2244TQCT application, or CY74FCT2244TQCT equivalent, key selection criteria include 3-state bus interface capability, integrated 25-Ω termination, TTL-compatible input/output levels, and Ioff-enabled power sequencing in multi-rail systems.
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 limits slew rate to suppress transmission-line reflections without external components.
The integrated 25-Ω series output resistors are matched across all eight outputs and operate within the specified 4.75–5.25 V supply range. Ioff functionality ensures high-impedance outputs when VCC = 0 V, preventing backflow current during hot insertion or partial power-down sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | 6.5 ns max at VCC = 4.75 V - enables reliable 150+ MHz bus operation with margin |
| Output Drive | 15 mA source / 12 mA sink - drives standard TTL loads without external buffers |
| Supply Voltage Range | 4.75 V to 5.25 V - compatible with regulated 5 V logic rails and rejects ±5% supply variation |
| Input Logic Compatibility | TTL-level VIH ≥ 2.0 V, VIL ≤ 0.8 V - interfaces directly with legacy TTL, NMOS, and CMOS without level shifters |
| On-Chip Termination | 25 Ω ±20% series resistor per output - eliminates need for discrete 22–33 Ω SMT resistors, reducing BOM count and board area |
| Ioff Current | ±1 µA at VCC = 0 V, VOUT = 4.5 V - prevents damaging backfeed during power sequencing in multi-voltage systems |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for robust handling in manufacturing and field use |
Pinout & Package
Package: 20-pin QSOP (SSOP), DBQ drawing, 0.64 mm pitch, 7.4–7.6 mm width, 12.6–13.0 mm length, 2.65 mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 17, 18, 19, 20 | Data Inputs (DA0–DA3, DB0–DB3) | Noninverting inputs for two independent 4-bit channels; accept TTL/CMOS logic levels |
| 5, 6, 7, 8, 13, 14, 15, 16 | 3-State Outputs (OA0–OA3, OB0–OB3) | Buffered, terminated outputs with 25-Ω series resistance; enter high-Z when respective OE is high |
| 9 | GND | Ground reference for all internal circuitry and I/O |
| 10 | VCC | 5 V supply input; decoupling capacitor required within 10 mm of pin |
| 11 | OEA | Active-low enable for OA0–OA3 outputs; controls first 4-bit channel |
| 12 | OEB | Active-low enable for OB0–OB3 outputs; controls second 4-bit channel |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω Output Series Resistors | Reduces PCB component count and layout complexity for impedance-matched bus driving |
| Edge-Rate Control Circuitry | Controls output slew rate to minimize simultaneous switching noise (SSN) and EMI emissions |
| Ioff Partial-Power-Down Support | Enables safe hot-plug and multi-rail sequencing by disabling outputs when VCC is unpowered |
| TTL-Compatible Input/Output Levels | Eliminates level-shifting circuitry when interfacing with legacy TTL, NMOS, or 5 V CMOS logic |
| 2000-V Human-Body Model ESD Rating | Meets industrial handling requirements without additional protection circuitry |
Applications
| Memory Address Bus Driver | System Clock Distribution |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates address lines during bus contention or standby. Use Value: Integrated 25-Ω resistors suppress ringing on long traces, maintaining setup/hold timing margins at >20 MHz clock rates. |
Use Scenario: Distributing a single system clock to multiple peripherals (e.g., UART, SPI, ADC) with matched trace lengths. IC Role / Device Role / Timing Role: Low-skew, terminated line driver ensuring clean clock edges across fanout branches. Use Value: 6.5 ns max tPLH/tPHL and edge-rate control reduce jitter accumulation and maintain <1 ns inter-channel skew. |
| Backplane Data Transceiver | Legacy Interface Bridge |
|
Use Scenario: Bidirectional data transfer between a modern FPGA and legacy ISA or VME bus peripherals. IC Role / Device Role / Timing Role: Dual-channel 3-state buffer enabling direction-controlled data flow with bus isolation. Use Value: Independent OEA/OEB enables precise timing control of read/write strobes, supporting 10–15 MHz burst transfers. |
Use Scenario: Interfacing a 3.3 V microcontroller GPIO bank to 5 V industrial sensors or displays using open-collector or TTL inputs. IC Role / Device Role / Timing Role: Level-tolerant buffer translating logic states while providing drive strength and noise immunity. Use Value: 15 mA source current and 2.4 V VOH at –15 mA ensure robust HIGH-level recognition by legacy 5 V receivers. |
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 |
|---|---|---|---|
| SN74FCT244NSR | Same FCT family, SOIC-20 package, 6.5 ns speed grade, but lacks integrated 25-Ω resistors | Requires external series termination resistors for reflection control | Select when board layout allows discrete termination or cost sensitivity outweighs BOM simplification |
| 74ACT244SCX | ACT family, 5 V operation, 8.5 ns typical delay, no Ioff, higher ICC (4 mA typical) | No partial-power-down support; unsuitable for hot-swap or multi-rail sequencing | Select only in fixed-power, single-rail systems where Ioff is not required and timing margin permits slower propagation |
Compared with SN74FCT244NSR and 74ACT244SCX, CY74FCT2244TQCT uniquely combines on-die 25-Ω termination, Ioff, and 6.5 ns performance-reducing layout risk in high-speed bus designs while enabling safe power sequencing in complex embedded systems.
Availability
CY74FCT2244TQCT is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial backplanes, and legacy interface bridges requiring stable component supply and long-term manufacturability.
Supply support for CY74FCT2244TQCT 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.
CY74FCT2244TQCT belongs to TI's FCT logic family, engineered for high-speed, low-noise 5 V digital interfacing with emphasis on bus integrity, power sequencing safety, and mixed-technology compatibility.
FAQ
What is the maximum operating temperature range for CY74FCT2244TQCT?
CY74FCT2244TQCT is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in factory automation controllers, motor drives, and outdoor communication equipment where thermal stability is critical. The device maintains full electrical specifications-including 6.5 ns propagation delay and 15 mA drive-across this entire range.
Does CY74FCT2244TQCT require external pull-up or pull-down resistors on its enable inputs?
No, CY74FCT2244TQCT does not require external biasing on OEA or OEB. Its TTL-compatible inputs have defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds, and internal design ensures predictable behavior when tied directly to VCC (for disable) or GND (for enable). External resistors are unnecessary unless used for specific noise filtering in high-EMI environments.
How does the 25-Ω on-chip series resistor in CY74FCT2244TQCT improve signal integrity?
The 25-Ω on-chip series resistor in CY74FCT2244TQCT matches typical PCB trace impedances (40–70 Ω) in source-series termination configurations. By placing resistance near the driver output, it damps reflections caused by impedance discontinuities at connectors or stubs-reducing overshoot, undershoot, and ringing without adding discrete components or consuming board space.
Can CY74FCT2244TQCT be used with a 3.3 V supply?
No, CY74FCT2244TQCT is specified only for 4.75–5.25 V operation. Its internal circuitry, including TTL-compatible input thresholds and 25-Ω resistor calibration, relies on nominal 5 V supply. Using 3.3 V will result in undefined logic levels, degraded noise margins, and failure to meet propagation delay or drive strength specifications. For 3.3 V systems, consider TI's LVC or AUC families instead.
What is the purpose of the Ioff feature in CY74FCT2244TQCT, and how is it verified?
The Ioff feature in CY74FCT2244TQCT disables all outputs when VCC = 0 V, limiting reverse current to ±1 µA even if driven signals are present on I/O pins. This is verified per datasheet test condition (VCC = 0 V, VOUT = 4.5 V) and enables safe hot-plug operation and multi-rail power sequencing-critical in modular systems where boards may be inserted while host power remains active.
CY74FCT2244TQCT 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
CY74FCT2244TQCT FAQ
1.How can I place an order for CY74FCT2244TQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2244TQCT 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 CY74FCT2244TQCT reliable?
The price and inventory of CY74FCT2244TQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2244TQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT2244TQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2244TQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2244TQCT?
CY74FCT2244TQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2244TQCT 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 CY74FCT2244TQCT?
For technical support, including CY74FCT2244TQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2244TQCT requirements.
6.How does Aetrix verify that CY74FCT2244TQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT2244TQCT 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 CY74FCT2244TQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT2244TQCT?
All CY74FCT2244TQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2244TQCT, 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 CY74FCT2244TQCT part is unused and in its original packaging.
Return procedure for CY74FCT2244TQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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