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Texas Instruments CD74ACT244E-NG
- Part No.:
- CD74ACT244E-NG
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74ACT244E-NG.pdf
- Description:
- PROTOTYPE
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
CD74ACT244E-NG from Texas Instruments is an octal 3-state non-inverting buffer/line driver in PDIP-20 package, designed for bus interface and data routing in industrial logic systems. It features ±24mA output drive, 5V supply operation (4.5–5.5V), active-low dual output enables (1OE, 2OE), and supports 50Ω transmission-line driving with 8.7ns max propagation delay at +85°C.
For engineers reviewing the CD74ACT244E-NG datasheet, CD74ACT244E-NG pinout, CD74ACT244E-NG application, or CD74ACT244E-NG equivalent, this page delivers verified electrical specs, banked I/O architecture, thermal performance data, and real-world implementation guidance for high-reliability digital interfacing.
Technical Context
The CD74ACT244E-NG implements two independent 4-bit banks (Bank 1: pins 2,4,6,8 → 18,16,14,12; Bank 2: pins 11,13,15,17 → 3,5,7,9), each controlled by its own active-low output enable (1OE on pin 1, 2OE on pin 19). All inputs are TTL-compatible with VIH = 2.0V min and VIL = 0.8V max at VCC = 4.5–5.5V.
It uses Advanced CMOS (ACT) technology to achieve bipolar FAST-speed performance with CMOS power efficiency: typical ICC = 8μA quiescent, <160μA over full temperature range (−40°C to +85°C), and guaranteed 50Ω line drive capability up to +85°C per TI SCHS287C Rev C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V–5.5V - ensures compatibility with standard 5V TTL and CMOS logic rails without level-shifting. |
| Output Drive | ±24mA - drives 15 FAST ICs or directly terminates 50Ω transmission lines, eliminating external line drivers. |
| Propagation Delay | 8.7ns max (tPLH/tPHL) - enables reliable operation in 100+ MHz bus systems with tight timing margins. |
| Input Thresholds | VIH = 2.0V min, VIL = 0.8V max - provides robust noise immunity (>30% of VCC) against TTL-level signals. |
| 3-State Leakage | ±5μA max (IOZ) - prevents signal contention and bus corruption during high-impedance state in shared-bus applications. |
| Power Dissipation Cap. | 71pF (CPD) - used to calculate dynamic power: PD = VCC² × fi × (CPD + CL), critical for thermal design at high frequencies. |
Pinout & Package
CD74ACT244E-NG is supplied in a 20-pin plastic dual in-line package (PDIP-N), body size 24.33mm × 6.35mm, with through-hole mounting and industry-standard 0.3" wide DIP footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Bank 1 Output Enable | Active-low control: pulls all Bank 1 outputs (1Y0–1Y3) into high-Z when HIGH; enables buffering when LOW. |
| 2 (1A0) | Bank 1 Input Channel 0 | Non-inverting input for first channel of Bank 1; connects to upstream data source (e.g., microcontroller port). |
| 3 (2Y3) | Bank 2 Output Channel 3 | Non-inverting output for fourth channel of Bank 2; drives downstream load (e.g., bus line or peripheral input). |
| 10 (GND) | Ground Reference | Primary return path for all I/O and supply currents; must be low-impedance and decoupled near VCC pin. |
| 19 (2OE) | Bank 2 Output Enable | Independent active-low control for Bank 2 outputs (2Y0–2Y3); enables asynchronous bus partitioning. |
| 20 (VCC) | Positive Supply | 5V power rail; requires local 0.1μF ceramic bypass capacitor placed within 5mm of pin for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| SCR-Latch-up-resistant process | Guarantees immunity to latch-up under transient overvoltage conditions per JEDEC JESD78, enabling use in noisy industrial environments. |
| Balanced propagation delays | Ensures simultaneous edge alignment across all 8 channels (tPLH ≈ tPHL), critical for skew-sensitive parallel bus interfaces. |
| 3-State output control per bank | Allows independent bidirectional bus management-e.g., CPU writes to memory via Bank 1 while peripherals read via Bank 2. |
| TTL-compatible inputs | Accepts standard 5V TTL logic levels without external biasing, simplifying integration with legacy microcontrollers and FPGAs. |
Applications
| Industrial Bus Interface | Microcontroller I/O Expansion |
|---|---|
Use Scenario: Isolating and driving address/data buses between PLC CPU and modular I/O racks operating in electrically noisy factory settings. IC Role / Device Role / Timing Role: Acts as a unidirectional bus buffer with bank-selectable 3-state control, preventing back-driving and reducing capacitive loading on long PCB traces. Use Value: Enables clean signal integrity over 15cm+ 50Ω-controlled traces at 20MHz without repeaters, validated per TI's 50Ω transmission-line-drive test at +85°C. | Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU to drive 8-channel LED indicators and relay drivers in HVAC control panels. IC Role / Device Role / Timing Role: Provides non-inverting, high-current (±24mA) buffering between MCU pins and discrete loads, with independent bank enables for staggered activation. Use Value: Eliminates need for discrete transistors or MOSFETs per channel, reducing BOM count and PCB area while maintaining 8.7ns timing margin for real-time response. |
| Memory Address Latching | Legacy System Interfacing |
Use Scenario: Driving multiplexed address lines to SRAM or EPROM in retro-computing restoration projects using 5V-only logic families. IC Role / Device Role / Timing Role: Serves as address latch driver with precise 3-state timing (tPZL/tPLZ = 12.2ns max), synchronizing with 74ACT373 enable edges. Use Value: Matches propagation delay and setup/hold timing of ACT-family latches, ensuring glitch-free address transitions and eliminating race conditions. | Use Scenario: Bridging communication between modern FPGA development boards and vintage 5V TTL peripherals (e.g., parallel printers, stepper motor controllers). IC Role / Device Role / Timing Role: Functions as a level-translation and fanout buffer, accepting FPGA LVCMOS33 outputs (with pull-up) and delivering robust 5V TTL-compatible signals. Use Value: Leverages TTL-input thresholds (VIH=2.0V) to reliably interpret 3.3V logic highs without external resistors, while sourcing 24mA to drive legacy 5V inputs. |
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 |
|---|---|---|---|
| SN74ACT244N | Identical pinout, AC/ACT logic family, same 4.5–5.5V operation and ±24mA drive; TI second-source part with identical parametric specs. | No functional difference; qualified for same industrial temperature range (−40°C to +85°C) and RoHS-compliant packaging. | Select SN74ACT244N when requiring TI's current-production branded variant with extended lifecycle support and documented obsolescence planning. |
| 74VHC244N | Lower drive (±8mA), wider supply range (2–5.5V), higher propagation delay (11.5ns max), and different input thresholds (VIH=3.5V @ 5V). | Suitable only for low-noise, low-speed (<10MHz) 5V systems where fanout and line-drive capability are not required. | Choose 74VHC244N only if supply voltage flexibility (down to 2V) or ultra-low ICC (<2μA) is prioritized over speed and drive strength. |
Compared with SN74ACT244N, CD74ACT244E-NG offers identical performance but differs in packaging (PDIP vs. PDIP with alternate marking) and qualification history; versus 74VHC244N, it delivers 3× higher output current and 25% faster timing-critical for noise-immune, high-fanout bus designs.
Availability
CD74ACT244E-NG is available at Aetrix Electronics and suitable for industrial automation, embedded control, and legacy system refurbishment requiring stable component supply, long-term manufacturability, and full temperature-range validation (−40°C to +85°C).
Supply support for CD74ACT244E-NG 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 expertise in high-reliability industrial and automotive-grade components.
The CD74ACT244E-NG belongs to TI's legacy Advanced CMOS (ACT) logic family, engineered for drop-in replacement of bipolar TTL in noise-sensitive, power-constrained industrial control systems while maintaining pin-for-pin compatibility and timing predictability.
FAQ
What is the maximum operating temperature for CD74ACT244E-NG?
The CD74ACT244E-NG is rated for operation from −40°C to +85°C, meeting industrial temperature requirements. This range is confirmed in Section 4.2 of the TI SCHS287C datasheet, and applies specifically to the CD74-series (commercial/industrial grade), unlike the CD54-series which extends to −55°C to +125°C.
Does CD74ACT244E-NG support 3.3V logic inputs?
Yes, CD74ACT244E-NG accepts 3.3V logic inputs reliably: its VIH(min) = 2.0V at VCC = 4.5–5.5V, providing 1.3V noise margin above a 3.3V high-level signal. However, it does not operate from a 3.3V supply-VCC must be 4.5–5.5V per recommended conditions.
Can CD74ACT244E-NG drive a 50Ω transmission line directly?
Yes, CD74ACT244E-NG is explicitly characterized for 50Ω transmission-line driving per TI SCHS287C Section 4.5 footnote (2): it delivers ±24mA output current sufficient to terminate and drive 50Ω lines at +85°C, validated with 75Ω capability at +125°C.
What is the function of pins 1 and 19 on CD74ACT244E-NG?
Pins 1 (1OE) and 19 (2OE) are active-low output enable inputs controlling separate 4-bit banks. When LOW, they enable the corresponding bank's outputs (1Y0–1Y3 or 2Y0–2Y3); when HIGH, those outputs enter high-impedance state-enabling bidirectional bus arbitration without external logic.
Is CD74ACT244E-NG pin-compatible with CD74AC244E?
Yes, CD74ACT244E-NG is pin-compatible with CD74AC244E: both are 20-pin PDIP devices with identical pin functions and physical layout. However, CD74AC244E operates from 1.5–5.5V and has lower drive (±24mA only at 5V), while CD74ACT244E-NG is optimized for 4.5–5.5V with guaranteed ±24mA across temperature.
CD74ACT244E-NG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74ACT244E-NG FAQ
1.How can I place an order for CD74ACT244E-NG through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT244E-NG 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 CD74ACT244E-NG reliable?
The price and inventory of CD74ACT244E-NG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT244E-NG is usually 5 days.
3.What payment methods are accepted for CD74ACT244E-NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT244E-NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT244E-NG?
CD74ACT244E-NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT244E-NG 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 CD74ACT244E-NG?
For technical support, including CD74ACT244E-NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT244E-NG requirements.
6.How does Aetrix verify that CD74ACT244E-NG is sourced from the original manufacturer or authorized distributors?
All CD74ACT244E-NG 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 CD74ACT244E-NG meets industry standards.
7.What is the process for return or replacement of CD74ACT244E-NG?
All CD74ACT244E-NG units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT244E-NG, 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 CD74ACT244E-NG part is unused and in its original packaging.
Return procedure for CD74ACT244E-NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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