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Texas Instruments CD74ACT244E
- Part No.:
- CD74ACT244E
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74ACT244E.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,337
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Product details
Overview
CD74ACT244E from Texas Instruments is an octal 3-state non-inverting buffer/line driver in PDIP-20 package, designed for bidirectional bus interfacing and data isolation in digital systems. It features ±24mA output drive, 5V supply operation (4.5–5.5V), active-low dual output enables (1OE, 2OE), and supports transmission-line driving at 50Ω. It is used in industrial control backplanes and microprocessor address/data bus buffering.
For engineers reviewing the CD74ACT244E datasheet, CD74ACT244E pinout, CD74ACT244E application, or CD74ACT244E equivalent, key selection criteria include its ACT-series TTL-compatible input thresholds, guaranteed 8.7ns max propagation delay at 5V, 3-state leakage <±5μA, and compatibility with FAST logic fanout requirements.
Technical Context
The CD74ACT244E 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). Its RCA Advanced CMOS process ensures SCR latch-up resistance and balanced tPLH/tPHL delays.
It operates strictly within 4.5V–5.5V VCC, with VIH ≥2.0V and VIL ≤0.8V - matching TTL logic levels - and delivers VOH ≥3.7V at -24mA and VOL ≤0.5V at +24mA across -40°C to +85°C, enabling direct interface with legacy 5V TTL and CMOS loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - ensures compatibility with standard 5V TTL/CMOS systems and stable operation under rail tolerance. |
| Output Drive | ±24mA - drives 50Ω transmission lines directly and fans out to 15 FAST ICs without external buffers. |
| Propagation Delay | Max 9.6ns (tPHL/tPLH) at 5V - enables high-speed bus buffering up to ~100MHz system clock domains. |
| Input Thresholds | VIH ≥2.0V, VIL ≤0.8V - provides full TTL-level noise immunity and seamless integration with legacy 5V logic families. |
| 3-State Leakage | ±5μA max (TA = -40°C to +85°C) - minimizes bus contention current and signal integrity risk during high-impedance state. |
| Power Dissipation Cap. | 71pF typical - determines dynamic power consumption (PD = VCC² × fi × (CPD + CL)) for thermal design at high-frequency operation. |
Pinout & Package
Packaged in 20-pin PDIP (N) with 24.33mm × 9.4mm body size, the CD74ACT244E uses through-hole mounting and supports industrial temperature range (-40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - independently disable Bank 1 (pins 2,4,6,8 → 18,16,14,12) or Bank 2 (pins 11,13,15,17 → 3,5,7,9). |
| 2,4,6,8 | 1A0–1A3 | Bank 1 inputs - accept TTL/CMOS logic signals; non-inverting path to corresponding Y outputs. |
| 11,13,15,17 | 2A0–2A3 | Bank 2 inputs - electrically isolated from Bank 1; support independent bus segment control. |
| 18,16,14,12 | 1Y0–1Y3 | Bank 1 outputs - deliver buffered, 3-state outputs synchronized to 1OE; drive heavy capacitive loads. |
| 3,5,7,9 | 2Y0–2Y3 | Bank 2 outputs - provide matched timing and drive strength to Bank 1; enable dual-bus arbitration. |
| 10 | GND | Ground reference - required for all DC biasing and noise rejection; must be low-impedance connection. |
| 20 | VCC | Positive supply - powers both banks; requires local 0.1µF bypass capacitor per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latch-up-resistant CMOS | Guarantees robust operation in noisy industrial environments without destructive latch-up events. |
| TTL-compatible input thresholds | VIH ≥2.0V / VIL ≤0.8V eliminates need for level-shifting when interfacing with legacy 5V microcontrollers or FPGAs. |
| Balanced propagation delays | tPLH and tPHL match within 0.9ns (max) - critical for skew-sensitive parallel bus applications like address/data latching. |
| ±24mA output drive | Supports direct 50Ω transmission-line termination without external resistors - reduces component count and PCB area. |
| 3-state output control | Dual independent OE pins allow selective bank isolation - essential for bidirectional bus arbitration and memory-mapped I/O. |
Applications
| Microprocessor Bus Buffering | Industrial Backplane Interface |
|---|---|
Use Scenario: Isolating and driving address/data buses between a microprocessor and multiple peripheral devices on a shared bus. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing direction-controlled signal amplification and bus contention prevention. Use Value: Enables reliable multi-drop communication with 8-bit parallel data paths while maintaining <9.6ns propagation delay and ±24mA drive capability. | Use Scenario: Interfacing modular I/O cards to a central controller in programmable logic controllers (PLCs) or CNC systems. IC Role / Device Role / Timing Role: Bidirectional line driver isolating noisy field-side signals from clean controller-side logic. Use Value: SCR-latch-up resistance and industrial temperature rating (-40°C to +85°C) ensure long-term reliability in electrically harsh factory environments. |
| Legacy System Upgrades | Test Equipment Signal Conditioning |
Use Scenario: Replacing obsolete TTL drivers (e.g., 74LS244) in aging instrumentation or telecom equipment. IC Role / Device Role / Timing Role: Pin-compatible upgrade delivering lower power and higher speed than LS-family equivalents. Use Value: TTL-compatible inputs and outputs eliminate redesign; 71pF CPD and 5V operation reduce dynamic power vs. bipolar alternatives. | Use Scenario: Driving calibrated test signals into high-capacitance fixtures or cable assemblies in ATE systems. IC Role / Device Role / Timing Role: Precision line driver ensuring signal integrity over 50Ω coaxial paths with minimal overshoot/ringing. Use Value: Matched VOH/VOL specs (≥3.7V / ≤0.5V at ±24mA) and low 3-state leakage (<±5μA) preserve measurement accuracy and fixture settling time. |
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 electrical specs, same PDIP-20 package, identical pinout and marking convention; manufactured by TI under alternate part numbering. | No functional difference - fully interchangeable in all designs using CD74ACT244E. | Select SN74ACT244N when sourcing from TI's current production line with updated packaging documentation. |
| 74ACT244PC | Same AC/ACT family specs but from ON Semiconductor; verified pinout and timing match; minor differences in quiescent current (ICC = 80μA max vs. 160μA). | Valid for commercial-temperature-only applications (0°C to +70°C); not rated for industrial -40°C to +85°C operation. | Choose 74ACT244PC only for cost-sensitive, non-industrial applications where extended temperature range is unnecessary. |
Compared with SN74ACT244N and 74ACT244PC, the CD74ACT244E offers guaranteed industrial temperature operation (-40°C to +85°C), TI's long-term product continuity, and documented SCR-latch-up immunity - making it the preferred choice for mission-critical embedded control systems.
Availability
CD74ACT244E is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-life availability, and RoHS-compliant through-hole assembly.
Supply support for CD74ACT244E 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 high-reliability components.
The CD74ACT244E belongs to TI's legacy logic portfolio, designed specifically for robust 5V TTL/CMOS bus interfacing in industrial, automotive, and aerospace systems requiring latch-up immunity and wide temperature operation.
FAQ
What is the maximum operating temperature range for the CD74ACT244E?
The CD74ACT244E is rated for industrial operation from -40°C to +85°C. This specification is confirmed in Section 4.2 Recommended Operating Conditions of the TI datasheet SCHS287C, and applies specifically to the CD74ACT244E (PDIP-20) variant, unlike military-grade CD54ACT244F3A which extends to +125°C.
Does the CD74ACT244E support 3.3V logic interfacing?
No, the CD74ACT244E does not support 3.3V operation. Its recommended VCC range is strictly 4.5V to 5.5V, and its input thresholds (VIH ≥2.0V, VIL ≤0.8V) are optimized for 5V TTL compatibility. Using it with 3.3V supplies risks undefined logic states and violates Absolute Maximum Ratings.
How many independent output banks does the CD74ACT244E have?
The CD74ACT244E has two independent 4-bit output banks: Bank 1 (inputs 1A0–1A3 on pins 2,4,6,8; outputs 1Y0–1Y3 on pins 18,16,14,12) and Bank 2 (inputs 2A0–2A3 on pins 11,13,15,17; outputs 2Y0–2Y3 on pins 3,5,7,9), each controlled by its own active-low enable (1OE on pin 1, 2OE on pin 19).
What is the output drive capability of the CD74ACT244E at 5V?
At VCC = 5V and TA = -40°C to +85°C, the CD74ACT244E delivers VOH ≥3.7V at -24mA sink and VOL ≤0.5V at +24mA source, as specified in Section 4.5 Electrical Characteristics: ACT Series of the TI datasheet. This enables direct 50Ω transmission-line driving without external termination.
Is the CD74ACT244E pin-compatible with the older 74LS244?
Yes, the CD74ACT244E is pin-compatible with the 74LS244 in PDIP-20 package and shares identical pin functions (e.g., 1A0–1A3, 1Y0–1Y3, 1OE, VCC, GND). However, it offers superior performance: faster propagation delay (9.6ns vs. 25ns), higher output drive (±24mA vs. ±8mA), and lower power consumption - making it a direct drop-in upgrade.
CD74ACT244E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 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 FAQ
1.How can I place an order for CD74ACT244E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT244E 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 reliable?
The price and inventory of CD74ACT244E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT244E is usually 5 days.
3.What payment methods are accepted for CD74ACT244E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT244E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT244E?
CD74ACT244E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT244E 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?
For technical support, including CD74ACT244E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT244E requirements.
6.How does Aetrix verify that CD74ACT244E is sourced from the original manufacturer or authorized distributors?
All CD74ACT244E 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 meets industry standards.
7.What is the process for return or replacement of CD74ACT244E?
All CD74ACT244E units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT244E, 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 part is unused and in its original packaging.
Return procedure for CD74ACT244E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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