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Texas Instruments CY74FCT244CTQC
- Part No.:
- CY74FCT244CTQC
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
CY74FCT244CTQC.pdf
- Description:
- BUS DRIVER, FCT SERIES
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Inventory:1,392
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Product details
Overview
CY74FCT244CTQC from Texas Instruments is an octal 3-state buffer/line driver IC designed for memory address, clock, and bus-oriented signal transmission in TTL- and CMOS-compatible systems. It features 4.1 ns maximum propagation delay, 64 mA sink / 32 mA source output drive, Ioff partial-power-down support, and edge-rate control for noise reduction.
For engineers reviewing the CY74FCT244CTQC datasheet, CY74FCT244CTQC pinout, CY74FCT244CTQC application, or CY74FCT244CTQC equivalent, key selection criteria include 3-state bus isolation capability, 5 V supply compatibility, matched rise/fall times, and QSOP-20 packaging for high-density PCB layouts.
Technical Context
This device implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), supporting bidirectional bus interfacing without external logic. Each half drives four outputs with TTL-compatible input thresholds and 3.3 V typical VOH under load.
The architecture integrates edge-rate control circuitry to limit slew rate and suppress simultaneous switching noise, while Ioff protection disables outputs and blocks backflow current when VCC = 0 V - enabling safe hot-insertion and partial-power-down operation in mixed-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | Max 4.1 ns (tPLH/tPHL) at VCC = 5 V, CL = 50 pF - enables high-speed address/data bus timing in legacy 5 V systems. |
| Output Drive | 64 mA sink / 32 mA source per output - sufficient to drive multiple TTL loads or terminated transmission lines. |
| Supply Voltage | 4.75 V to 5.25 V - tightly regulated 5 V operation compatible with standard logic rails and avoids overvoltage stress. |
| Ioff Current | ±1 µA at VCC = 0 V - prevents damaging back-current during power sequencing or board hot-swap events. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures reliable recognition of TTL-level inputs without level-shifting components. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for robust handling in manufacturing and field environments. |
| Package | QSOP-20 (DBQ), 0.154" body width - surface-mount footprint optimized for automated assembly and space-constrained industrial control boards. |
Pinout & Package
Package: QSOP-20 (DBQ), 0.635 mm pitch, 7.2 mm × 5.3 mm body, RoHS-compliant green finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OEA) | Output Enable A | Active-low control for first 4 drivers (OA0–OA3); asserts high-impedance state when high. |
| 2 (DA0) | Data Input A0 | Noninverting input for buffer OA0; accepts TTL/CMOS logic levels directly. |
| 3 (OA0) | Output A0 | Noninverting buffered output driven by DA0; supports 3-state when OEA = high. |
| 4 (DA1) | Data Input A1 | Noninverting input for buffer OA1; electrically identical to DA0. |
| 5 (OA1) | Output A1 | Noninverting buffered output driven by DA1; shares OEA control with OA0–OA3. |
| 6 (DA2) | Data Input A2 | Noninverting input for buffer OA2; part of A-side 4-bit group. |
| 7 (OA2) | Output A2 | Noninverting buffered output driven by DA2; 3-state enabled by OEA. |
| 8 (DA3) | Data Input A3 | Noninverting input for buffer OA3; completes A-side data path. |
| 9 (OA3) | Output A3 | Noninverting buffered output driven by DA3; final A-side output. |
| 10 (GND) | Ground | Reference return for all signals and power; must be low-impedance connection to system ground plane. |
| 11 (VCC) | Supply Voltage | +5 V power rail; bypassing with 0.1 µF ceramic capacitor near pin is mandatory for noise immunity. |
| 12 (OEB) | Output Enable B | Active-low control for second 4 drivers (OB0–OB3); independent of OEA for flexible bus partitioning. |
| 13 (OA0) | Output B0 | Noninverting buffered output driven by DB0; 3-state enabled by OEB. |
| 14 (DB0) | Data Input B0 | Noninverting input for buffer OB0; forms B-side 4-bit group with DB1–DB3. |
| 15 (OA1) | Output B1 | Noninverting buffered output driven by DB1; shares OEB control with OB0–OB3. |
| 16 (DB1) | Data Input B1 | Noninverting input for buffer OB1; electrically identical to DB0. |
| 17 (OA2) | Output B2 | Noninverting buffered output driven by DB2; completes B-side output set. |
| 18 (DB2) | Data Input B2 | Noninverting input for buffer OB2; part of B-side data path. |
| 19 (OA3) | Output B3 | Noninverting buffered output driven by DB3; final B-side output, 3-state via OEB. |
| 20 (DB3) | Data Input B3 | Noninverting input for buffer OB3; completes B-side 4-bit input group. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting slew rate - critical for stable signal integrity on shared buses. |
| Ioff partial-power-down | Enables safe operation during VCC ramp-up/down or hot-swap by disabling outputs and blocking reverse current flow. |
| Matched rise/fall times | Ensures symmetrical waveform edges - minimizes duty-cycle distortion in clock distribution applications. |
| TTL/CMOS input compatibility | Accepts standard 5 V logic thresholds without external biasing - simplifies interface with legacy microcontrollers and FPGAs. |
| 3.3 V typical VOH | Provides margin for driving 3.3 V inputs in mixed-voltage systems while maintaining full 5 V noise immunity. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or EPROM devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates address bus segments during memory access arbitration. Use Value: 4.1 ns propagation delay ensures setup/hold timing margins are met across temperature and voltage extremes. | Use Scenario: Interfacing PLC CPU modules with distributed I/O racks over extended parallel control buses. IC Role / Device Role / Timing Role: Bidirectional line driver/receiver with independent OEA/OEB enables selective segment enablement and fault containment. Use Value: 64 mA sink capability drives long traces with capacitive loading while edge-rate control suppresses EMI in noisy factory environments. |
| Legacy System Clock Distribution | Test Equipment Signal Conditioning |
Use Scenario: Fan-out and level-shifting of system clocks (e.g., 8 MHz, 16 MHz) to multiple peripheral chips in retro-computing hardware. IC Role / Device Role / Timing Role: Low-skew clock buffer with matched rise/fall times preserves duty cycle integrity for synchronous logic. Use Value: Matched tPLH/tPHL (≤0.5 ns variation) prevents clock skew-induced metastability in multi-chip timing domains. | Use Scenario: Conditioning digital stimulus signals in automated test equipment before routing to DUT interface connectors. IC Role / Device Role / Timing Role: 3-state buffer isolates test pattern generators from DUT backdrive during measurement phases. Use Value: Ioff protection prevents damage when DUT powers up/down independently, ensuring long-term reliability in production test fixtures. |
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 |
|---|---|---|---|
| SN74FCT244CTSOCT | Same logic function and electrical specs; SOIC-20 package instead of QSOP-20 - 2.4 mm wider body, 1.27 mm pitch. | Preferred where board real estate allows larger SOIC footprint and hand-soldering or legacy reflow profiles are used. | Select for ease of prototyping or compatibility with existing SOIC-based PCB footprints. |
| 74AC244SCX | Higher speed (3.5 ns max), lower drive (24 mA sink), no Ioff or edge-rate control; 2 V to 6 V supply range. | Suitable for newer 3.3 V systems but lacks partial-power-down safety and noise suppression features. | Choose only if higher speed is critical and system-level power sequencing is fully controlled. |
Compared with SN74FCT244CTSOCT and 74AC244SCX, CY74FCT244CTQC delivers superior noise immunity via edge-rate control and guaranteed safe hot-swap behavior through Ioff - making it the preferred choice for industrial control and legacy 5 V bus architectures requiring robustness over raw speed.
Availability
CY74FCT244CTQC is available at Aetrix Electronics and suitable for industrial control systems, legacy computing upgrades, and test equipment requiring stable component supply with long-term lifecycle assurance.
Supply support for CY74FCT244CTQC 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 markets.
The CY74FCT244CTQC belongs to TI's FCT logic family, engineered for high-speed, low-noise 5 V bus interfacing in mission-critical industrial and computing applications where reliability and signal integrity are paramount.
FAQ
What is the maximum operating temperature range for CY74FCT244CTQC?
The CY74FCT244CTQC is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade temperature range ensures reliable performance in programmable logic controllers, motor drives, and factory automation equipment exposed to wide thermal swings. The device maintains specified propagation delay, drive strength, and Ioff behavior across this full range when powered within its 4.75 V to 5.25 V supply window.
Does CY74FCT244CTQC support hot-swap or partial-power-down operation?
Yes, CY74FCT244CTQC includes Ioff circuitry that actively disables outputs and limits reverse current to ±1 µA when VCC = 0 V. This feature enables safe insertion/removal in live backplanes and supports partial-power-down modes in multi-rail systems. Unlike standard buffers, CY74FCT244CTQC prevents damaging backflow through powered-down sections - a critical requirement in modular industrial controllers and telecom line cards.
What package type is used for CY74FCT244CTQC and what are its key mechanical attributes?
CY74FCT244CTQC uses the QSOP-20 (DBQ) package: 20-pin, 0.635 mm lead pitch, 7.2 mm × 5.3 mm body size, 1.75 mm max height. Its narrow 0.154" width saves PCB area versus SOIC, while gull-wing leads support automated optical inspection and high-yield reflow. The green RoHS-compliant finish and MSL Level-2 rating ensure compatibility with standard SMT assembly lines.
How does the edge-rate control in CY74FCT244CTQC improve system noise performance?
CY74FCT244CTQC integrates internal edge-rate control to limit output slew rate, reducing simultaneous switching noise (SSN) and electromagnetic interference (EMI). This design lowers peak current transients during logic transitions, minimizing ground bounce and crosstalk on densely routed PCBs - especially beneficial in shared address/data buses within industrial HMIs and instrumentation systems where signal integrity directly impacts measurement accuracy.
Can CY74FCT244CTQC interface directly with both TTL and CMOS logic families?
Yes, CY74FCT244CTQC features TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and CMOS-compatible output voltage levels (VOH ≈ 3.3 V, VOL ≤ 0.55 V at full load), enabling direct interconnection with 5 V TTL, NMOS, and CMOS devices without level shifters or pull-up resistors. Its 5 V supply and robust noise margins make it ideal for bridging legacy logic families in system upgrades and mixed-technology designs.
CY74FCT244CTQC 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:
- -
CY74FCT244CTQC FAQ
1.How can I place an order for CY74FCT244CTQC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT244CTQC 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 CY74FCT244CTQC reliable?
The price and inventory of CY74FCT244CTQC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT244CTQC is usually 5 days.
3.What payment methods are accepted for CY74FCT244CTQC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT244CTQC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT244CTQC?
CY74FCT244CTQC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT244CTQC 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 CY74FCT244CTQC?
For technical support, including CY74FCT244CTQC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT244CTQC requirements.
6.How does Aetrix verify that CY74FCT244CTQC is sourced from the original manufacturer or authorized distributors?
All CY74FCT244CTQC 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 CY74FCT244CTQC meets industry standards.
7.What is the process for return or replacement of CY74FCT244CTQC?
All CY74FCT244CTQC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT244CTQC, 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 CY74FCT244CTQC part is unused and in its original packaging.
Return procedure for CY74FCT244CTQC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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