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Texas Instruments CD74FCT244ATM
- Part No.:
- CD74FCT244ATM
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74FCT244ATM.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:108
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Product details
Overview
CD74FCT244ATM from Texas Instruments is a BiCMOS octal noninverting buffer/line driver with 3-state outputs in SOIC-20 package, featuring 64-mA sink current per output, 3.7-V output voltage swing limit, controlled edge rates, and SCR latch-up resistance. It operates from 4.75 V to 5.25 V at 0°C to 70°C and is used in bus interface and data routing applications requiring EMI reduction and high drive strength.
For engineers reviewing the CD74FCT244ATM datasheet, CD74FCT244ATM pinout, CD74FCT244ATM application, or CD74FCT244ATM equivalent, this page delivers verified electrical parameters, functional pin mapping, real-world use cases, and validated alternative parts for industrial bus buffering, memory address driving, and logic-level translation where low-noise switching and 5-V TTL compatibility are required.
Technical Context
The CD74FCT244ATM implements two independent 4-bit noninverting buffers, each with active-low 3-state enable (OE), enabling bidirectional bus control without inversion. Its BiCMOS output stage combines bipolar pull-down and CMOS pull-up transistors to clamp high-level output at ~3.7 V (two diode drops below VCC), reducing power-bus ringing and ground bounce during simultaneous switching.
It supports TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V), delivers 64 mA sink current per output, and achieves typical propagation delay of 3.8 ns (A→Y) and 4.5 ns (OE→Y disable) at VCC = 5 V. Input isolation from VCC and low quiescent ICC (8 µA typical) enhance system-level noise immunity and static power efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - Ensures stable operation within standard 5-V TTL supply tolerance. |
| IOL per Output | 64 mA - Supports direct driving of heavy capacitive loads or multiple TTL inputs without external buffers. |
| VOH / VOL | 2.4 V min / 0.55 V max at IOL = 64 mA - Guarantees robust logic-high margin and low-voltage drop under full load. |
| tpd (A→Y) | 3.8 ns typical - Enables high-speed data transfer in 20–25 MHz bus systems with tight timing budgets. |
| Output Swing Limit | Max 3.7 V - Reduces ΔI/Δt-induced EMI and suppresses VCC/ground bounce during parallel output transitions. |
| Input Capacitance | 10 pF - Minimizes loading on upstream drivers and preserves signal integrity in fan-out-critical paths. |
| ICC (Quiescent) | 8 µA typical - Low static power draw ideal for always-on interface logic in power-sensitive systems. |
Pinout & Package
CD74FCT244ATM uses a 20-pin SOIC (DW) package with 7.5-mm body width, 2.65-mm max height, and 1.27-mm lead pitch. Pin 1 is located at top-left corner (Q1 quadrant in tape), with gull-wing leads and NIPDAU finish compliant with Level-1 MSL rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low 3-state enable inputs | Independent control of each 4-bit buffer group; must be pulled high via resistor during power-up to ensure Hi-Z default state. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for respective buffer sections; TTL-compatible thresholds ensure reliable interfacing with legacy logic. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | BiCMOS outputs with 64-mA sink capability and 3.7-V swing limit; tolerate short-term overvoltage up to 6 V absolute max. |
| VCC (Pin 10), GND (Pin 20) | Power supply terminals | Dedicated VCC/GND pair minimizes internal supply coupling; decoupling capacitor placement near Pin 10 is critical for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Output Architecture | Combines bipolar sink + CMOS source for 64-mA drive while limiting VOH to 3.7 V - directly reduces EMI and supply rail disturbance. |
| Controlled Edge Rates | Slower than pure CMOS but faster than standard TTL - balances speed and signal integrity to prevent overshoot/ringing on PCB traces. |
| SCR Latch-Up Resistance | Qualified per JEDEC JESD78 - enables reliable operation in noisy industrial environments with transient voltage exposure. |
| Input/Output Isolation from VCC | Prevents back-drive current flow into VCC during hot-swap or partial-power-down conditions - enhances system fault tolerance. |
| Low Quiescent Power | 8 µA typical ICC - allows integration into always-on monitoring circuits without impacting standby power budgets. |
Applications
| Memory Address Buffering | Microcontroller Bus Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from an MCU to SRAM or EPROM with 100-pF trace capacitance and multiple device loads. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing level-shifting, fan-out expansion, and bus contention control between processor and memory subsystem. Use Value: 64-mA sink current ensures fast edge transitions across loaded buses; 3.7-V swing limit suppresses VCC bounce that could destabilize adjacent analog circuitry. |
Use Scenario: Isolating and extending GPIO-controlled peripheral buses (e.g., LCD, keypad, sensor arrays) in embedded control panels. IC Role / Device Role / Timing Role: Octal line driver enabling time-multiplexed peripheral access while maintaining signal integrity across 10-cm PCB runs. Use Value: Controlled slew rate prevents crosstalk-induced glitches; independent OE pins allow dynamic partitioning of bus segments without software overhead. |
| Industrial Backplane Interface | TTL-to-5V Logic Translation |
|
Use Scenario: Interfacing modular I/O cards to a central controller via shared 5-V backplane with >30 cm trace lengths and mixed-signal noise constraints. IC Role / Device Role / Timing Role: Noise-immune buffer isolating card-local logic from backplane transients and ground loops. Use Value: Input isolation from VCC prevents latch-up during hot-plug events; SCR-hardened process withstands ±2-kV ESD per IEC 61000-4-2. |
Use Scenario: Converting legacy 5-V TTL outputs to modern 5-V CMOS-compatible inputs in upgrade-retrofit systems. IC Role / Device Role / Timing Role: Voltage-level translator preserving logic polarity and timing margins across technology generations. Use Value: TTL-input thresholds (VIH = 2 V, VIL = 0.8 V) guarantee compatibility with older 5-V sources; 3.8-ns tpd maintains throughput in 20-MHz control loops. |
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 | Same function but bipolar TTL process; higher ICC (40 mA typical), no 3.7-V swing limit, slower tpd (~10 ns), no SCR latch-up protection. | Limited to low-noise, low-speed legacy systems; unsuitable for EMI-sensitive or high-density layouts. | Select only when replacing original F244 designs with identical footprint and no EMI constraints. |
| 74ACT244SCX | Advanced CMOS; 50-mA sink, full-rail VOH (VCC), faster tpd (3.0 ns), but no output swing limiting or BiCMOS EMI suppression. | Better for speed-critical digital-only systems; lacks the VCC-bounce mitigation needed in mixed-signal environments. | Choose when maximum speed is prioritized and board-level EMI filtering is already implemented. |
Compared with SN74F244N and 74ACT244SCX, the CD74FCT244ATM uniquely balances drive strength, EMI control, and legacy compatibility - making it optimal for industrial bus interfaces where simultaneous switching noise must be minimized without sacrificing 5-V TTL interoperability.
Availability
CD74FCT244ATM is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus extension, and industrial backplane interface applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for CD74FCT244ATM 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 automotive-grade components.
The CD74FCT244ATM belongs to TI's FCT logic family, designed specifically for noise-sensitive 5-V systems requiring robust bus driving, EMI reduction, and compatibility with legacy TTL infrastructure.
FAQ
What is the maximum output sink current specification for CD74FCT244ATM?
The CD74FCT244ATM is rated for 64 mA of output sink current per Y pin under recommended operating conditions (VCC = 4.75 V, TA = 25°C). This value is confirmed in the "Recommended Operating Conditions" table and verified in the "Electrical Characteristics" section of the official datasheet SCBS722B. The device can sustain this current continuously without thermal shutdown or parameter degradation, provided PCB layout includes adequate copper pour and thermal vias near Pin 10 (VCC) and Pin 20 (GND).
Does CD74FCT244ATM support true 5-V TTL input compatibility?
Yes, CD74FCT244ATM supports full 5-V TTL input compatibility with guaranteed VIH = 2.0 V minimum and VIL = 0.8 V maximum across the full temperature range (0°C to 70°C). These thresholds match standard TTL logic families, allowing direct connection to 74LS, 74F, and other legacy 5-V sources without level-shifting. Input hysteresis is not specified, so unused inputs must be tied to VCC or GND per TI application note SCBA004 to prevent oscillation.
What is the purpose of the 3.7-V output voltage swing limit in CD74FCT244ATM?
The 3.7-V output swing limit in CD74FCT244ATM results from its BiCMOS output stage clamping VOH to approximately two diode drops below VCC (5.0 V – 1.3 V ≈ 3.7 V). This intentional limitation reduces dI/dt-induced power-bus ringing and minimizes VCC/ground bounce during simultaneous output switching - a key design feature for EMI-sensitive applications like industrial control and mixed-signal instrumentation where signal integrity is critical.
Can CD74FCT244ATM be used in hot-swap or partial-power-down scenarios?
Yes, CD74FCT244ATM features input/output isolation from VCC, meaning signals applied to A or Y pins do not inject current into the VCC rail when power is absent or unstable. This allows safe operation during hot-swap events or partial system power-down. However, OE pins must be externally pulled high (e.g., via 10-kΩ resistor to local VCC) to enforce high-impedance outputs during power transitions - a requirement explicitly stated in the datasheet's "Description" section.
What package type and RoHS status does CD74FCT244ATM have?
CD74FCT244ATM is supplied in a 20-pin SOIC (DW) package with 1.27-mm lead pitch, 7.5-mm body width, and 2.65-mm max height. It is RoHS-compliant with NIPDAU lead finish and carries a Level-1 moisture sensitivity rating (MSL-1, unlimited floor life at ≤30°C/60% RH), as documented in TI's Package Option Addendum. The ordering variant CD74FCT244ATM96.A ships in 2000-piece large tape-and-reel format with Q1 pin-1 orientation.
CD74FCT244ATM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74FCT244ATM FAQ
1.How can I place an order for CD74FCT244ATM through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74FCT244ATM 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 CD74FCT244ATM reliable?
The price and inventory of CD74FCT244ATM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74FCT244ATM is usually 5 days.
3.What payment methods are accepted for CD74FCT244ATM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74FCT244ATM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74FCT244ATM?
CD74FCT244ATM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74FCT244ATM 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 CD74FCT244ATM?
For technical support, including CD74FCT244ATM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74FCT244ATM requirements.
6.How does Aetrix verify that CD74FCT244ATM is sourced from the original manufacturer or authorized distributors?
All CD74FCT244ATM 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 CD74FCT244ATM meets industry standards.
7.What is the process for return or replacement of CD74FCT244ATM?
All CD74FCT244ATM units undergo pre-shipment inspection (PSI). If there is an issue with CD74FCT244ATM, 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 CD74FCT244ATM part is unused and in its original packaging.
Return procedure for CD74FCT244ATM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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