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Texas Instruments CD74FCT244ATE
- Part No.:
- CD74FCT244ATE
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74FCT244ATE.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:845
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Product details
Overview
CD74FCT244ATE from Texas Instruments is a BiCMOS octal noninverting buffer/line driver with 3-state outputs, designed for bus interface and data routing in 5-V TTL-compatible systems. It features dual 4-bit sections with independent active-low output-enable (OE) controls, 64-mA sink capability per output, 3.7-V limited high-level output swing, and SCR latch-up resistance. It is used in address/data bus buffering in industrial control and instrumentation systems.
For engineers reviewing the CD74FCT244ATE datasheet, CD74FCT244ATE pinout, CD74FCT244ATE application, or CD74FCT244ATE equivalent, key selection criteria include its 5-V operation, 3-state drive strength, controlled edge rates for EMI reduction, and PDIP-20 package compatibility with legacy through-hole designs.
Technical Context
The CD74FCT244ATE implements a BiCMOS process combining bipolar pull-down and CMOS pull-up transistors to limit VOH to ~3.7 V (two diode drops below VCC), reducing power-bus ringing and ground bounce during simultaneous switching. Its output stage delivers 64 mA sink current while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V).
Each of the two 4-bit sections operates independently: when OE is low, A→Y data passes transparently; when OE is high, outputs enter high-impedance state. Input/Output isolation from VCC and buffered inputs ensure noise immunity and stable power-rail behavior during power-up/down sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - Ensures robust operation across standard 5-V supply tolerances in industrial environments. |
| IOL per Output | 64 mA - Supports direct driving of heavy capacitive loads or multiple TTL inputs without external buffers. |
| VOH Limit | 3.7 V max - Reduces ΔV on VCC/GND rails during fast switching, lowering EMI and signal integrity risk. |
| tpd (A→Y) | 1.5 ns to 5.3 ns - Enables high-speed bus buffering in real-time control and data acquisition timing budgets. |
| ten / tdis | 1.5 ns to 6.5 ns - Guarantees predictable enable/disable timing for synchronized bus arbitration and multiplexing. |
| Input Clamping | VIK = –1.2 V - Provides transient overvoltage protection on inputs without external diodes. |
| ICC (max) | 80 µA - Delivers ultra-low quiescent power in standby or idle bus states. |
Pinout & Package
CD74FCT244ATE is housed in a 20-pin plastic dual in-line package (PDIP-N), 0.300-inch wide, with standard through-hole mounting and RoHS-compliant NiPdAu lead finish. Pin 1 is marked by a notch or dot at the top-left corner (top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control | Independent enables for each 4-bit section; tie to VCC via pullup for safe power-up high-Z state. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for respective output groups; TTL-compatible thresholds ensure interoperability. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | BiCMOS outputs with 64-mA sink strength and 3.7-V VOH limit to suppress rail bounce. |
| VCC (Pin 10), GND (Pin 20) | Power supply terminals | Dedicated VCC/GND pair minimizes internal supply coupling between sections; decoupling required near Pin 10. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Output Architecture | Combines bipolar sink + CMOS source for 64-mA drive with low static current and EMI-suppressing VOH clamping. |
| Controlled Edge Rates | Internal slew-rate limiting reduces harmonic content and radiated emissions in dense PCB layouts. |
| SCR Latch-Up Resistance | Process and circuit hardening prevents destructive latch-up under transient overvoltage or hot-swap conditions. |
| Input/Output Isolation from VCC | Prevents back-powering or unintended conduction paths during partial power-down sequences. |
| Buffered Inputs | High-impedance, noise-immune inputs reduce loading on upstream drivers and improve fanout margin. |
Applications
| Microcontroller Bus Interface | Industrial PLC Backplane |
|---|---|
Use Scenario: Interfacing an 8-bit microcontroller's address/data bus to external memory or peripheral ICs with different voltage or timing requirements. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer isolating MCU bus segments and enabling time-multiplexed access to shared resources. Use Value: 64-mA sink strength drives long traces and multiple TTL loads; 3.7-V VOH prevents overshoot-induced timing violations on 5-V buses. | Use Scenario: Signal conditioning and level translation between modular I/O cards and central controller in programmable logic controllers. IC Role / Device Role / Timing Role: Unidirectional line driver amplifying digital control signals across noisy industrial backplanes with EMI resilience. Use Value: Controlled edge rates and low ground bounce minimize false triggering in safety-critical control loops. |
| Test Equipment Data Routing | Legacy System Upgrade Interface |
Use Scenario: Multiplexing sensor data streams from multiple analog-to-digital converters into a single acquisition channel in automated test systems. IC Role / Device Role / Timing Role: Octal 3-state buffer enabling dynamic reconfiguration of signal paths under software control. Use Value: Independent OE pins allow precise per-section enable timing, supporting synchronized sampling windows across channels. | Use Scenario: Retrofitting modern microcontrollers into aging equipment originally designed for 74LS244 logic, preserving existing PCB layouts. IC Role / Device Role / Timing Role: Pin-compatible TTL-buffer replacement delivering higher drive strength and lower power than legacy bipolar parts. Use Value: Identical PDIP-20 footprint and logic function with improved VOL (0.55 V) and ICC (80 µA vs. >10 mA for LS), extending system uptime. |
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 | Bipolar TTL design; 15-mA sink, higher ICC (~60 mA), no VOH clamping, faster tpd but higher EMI. | Limited drive strength and higher power dissipation restrict use in high-fanout or thermally constrained designs. | Select when legacy TTL compatibility is mandatory and EMI is not critical. |
| 74ACT244PC | Advanced CMOS; 24-mA sink, rail-to-rail VOH, lower Cpd (22 pF), but no BiCMOS EMI suppression. | Higher VOH increases ground bounce risk on dense boards; unsuitable where VCC bounce must be minimized. | Prefer for low-capacitance, low-power systems with clean power distribution and minimal trace length. |
Compared with SN74F244N and 74ACT244PC, the CD74FCT244ATE uniquely balances 64-mA drive, 3.7-V VOH clamping for EMI control, and 80-µA quiescent current-making it optimal for industrial bus interfaces where reliability, noise immunity, and legacy PDIP compatibility are jointly required.
Availability
CD74FCT244ATE is available at Aetrix Electronics and suitable for industrial control systems, test instrumentation, and legacy hardware upgrades requiring stable component supply and long-term obsolescence management.
Supply support for CD74FCT244ATE 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 connectivity technologies, with decades of experience in industrial-grade logic and interface solutions.
The CD74FCT244ATE belongs to TI's FCT logic family, engineered for high-speed, low-noise 5-V bus interfacing in harsh industrial and instrumentation environments where EMI control and latch-up immunity are critical.
FAQ
What is the maximum output sink current specification for CD74FCT244ATE?
The CD74FCT244ATE supports up to 64 mA of output sink current per pin under recommended operating conditions (VCC = 4.75 V to 5.25 V, TA = 0°C to 70°C). This value is confirmed in the "Recommended Operating Conditions" table and verified in electrical characteristics testing at IOL = 64 mA with VOL ≤ 0.55 V. Exceeding this rating risks thermal overstress or parametric shift.
Does CD74FCT244ATE require external pull-up resistors on its OE pins?
Yes - to ensure outputs remain in high-impedance state during power-up or power-down, OE pins should be tied to VCC via an external pull-up resistor. The minimum resistance value depends on the current-sinking capability of the driving source; TI recommends calculating based on the maximum IIH (±1 µA) and desired voltage margin. Leaving OE floating may cause undefined output states and bus contention.
Is CD74FCT244ATE compatible with 3.3-V logic inputs?
No - CD74FCT244ATE is a 5-V-only device with TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), and its absolute maximum input voltage is VCC (5.25 V). Direct connection to 3.3-V logic sources risks violating VI < 0 V or VI > VCC limits unless level-shifting circuitry is used. It is not designed for mixed-voltage interfacing without external translation.
What is the thermal impedance (θJA) of the CD74FCT244ATE PDIP package?
The CD74FCT244ATE in its PDIP-20 (N) package has a junction-to-ambient thermal impedance (θJA) of 69°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC test board conditions (single-layer copper, 1 in² pad); actual board layout significantly impacts thermal performance, and derating is required above TA = 70°C.
How does the BiCMOS output structure of CD74FCT244ATE reduce electromagnetic interference?
The CD74FCT244ATE uses a BiCMOS output stage that limits VOH to approximately 3.7 V (two diode drops below VCC), which directly reduces the ΔV across power and ground rails during simultaneous switching. This suppression of power-bus ringing and VCC/GND bounce lowers broadband radiated emissions - a key EMI source in densely routed industrial PCBs - without requiring external termination or slew-rate control circuits.
CD74FCT244ATE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74FCT244ATE FAQ
1.How can I place an order for CD74FCT244ATE through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74FCT244ATE 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 CD74FCT244ATE reliable?
The price and inventory of CD74FCT244ATE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74FCT244ATE is usually 5 days.
3.What payment methods are accepted for CD74FCT244ATE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74FCT244ATE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74FCT244ATE?
CD74FCT244ATE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74FCT244ATE 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 CD74FCT244ATE?
For technical support, including CD74FCT244ATE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74FCT244ATE requirements.
6.How does Aetrix verify that CD74FCT244ATE is sourced from the original manufacturer or authorized distributors?
All CD74FCT244ATE 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 CD74FCT244ATE meets industry standards.
7.What is the process for return or replacement of CD74FCT244ATE?
All CD74FCT244ATE units undergo pre-shipment inspection (PSI). If there is an issue with CD74FCT244ATE, 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 CD74FCT244ATE part is unused and in its original packaging.
Return procedure for CD74FCT244ATE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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