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Texas Instruments SN74ABT2244AN
- Part No.:
- SN74ABT2244AN
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT2244AN.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:798
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Product details
Overview
SN74ABT2244AN from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and bus-oriented applications. It operates from 4.5 V to 5.5 V, supports –40°C to 85°C ambient temperature, sinks up to 12 mA per output, and features integrated 25-Ω series resistors to suppress overshoot/undershoot in high-speed digital buses.
For engineers reviewing the SN74ABT2244AN datasheet, SN74ABT2244AN pinout, SN74ABT2244AN application, or SN74ABT2244AN equivalent, key selection criteria include 3-state bus driving capability, output current rating (12 mA), propagation delay (≤4.7 ns typ), power-up high-impedance behavior, and PDIP-20 package compatibility with legacy through-hole designs.
Technical Context
This device implements two independent 4-bit noninverting buffer groups (1A→1Y and 2A→2Y), each controlled by a dedicated active-low output-enable (OE) input. Its EPIC-IIB BiCMOS process delivers low power dissipation while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and CMOS-level output drive.
The SN74ABT2244AN enters high-impedance state when VCC is between 0 and 2.1 V during power-up/down. Above 2.1 V, OE must be pulled high via external resistor to guarantee 3-state operation - minimum pullup value depends on driver sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS systems and robust noise margin |
| Output Drive | 12 mA sink per Y output - sufficient to drive multiple TTL loads or short PCB traces without external termination |
| Propagation Delay | ≤4.7 ns (tPLH/tPHL, VCC = 5 V, TA = 25°C) - enables reliable operation in 100+ MHz bus timing budgets |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - guarantees interoperability with standard TTL logic families |
| ESD Protection | >2000 V HBM, >200 V MM - exceeds MIL-STD-883 requirements for handling robustness in manufacturing and field use |
| Thermal Resistance | θJA = 67°C/W (PDIP-N) - defines maximum power dissipation limit under natural convection cooling |
Pinout & Package
SN74ABT2244AN uses a 20-pin plastic dual in-line package (PDIP-N) with 0.3-inch body width and 0.1-inch lead pitch. The package is through-hole mountable, RoHS-compliant, and rated for industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19 | Group 1 Output Enable (active-low) | Controls all four 1Y outputs; asserts high-impedance when logic high |
| 2OE, 2 | Group 2 Output Enable (active-low) | Controls all four 2Y outputs; independent of Group 1 for flexible bus partitioning |
| 1A1–1A4, 2–4,6,8 | Group 1 Data Inputs | Noninverting inputs feeding 1Y1–1Y4; TTL-compatible voltage thresholds |
| 2A1–2A4, 11,13,15,17 | Group 2 Data Inputs | Noninverting inputs feeding 2Y1–2Y4; electrically isolated from Group 1 |
| 1Y1–1Y4, 18,16,14,12 | Group 1 Buffered Outputs | 3-state outputs with integrated 25-Ω series resistance to damp signal reflections |
| 2Y1–2Y4, 9,7,5,3 | Group 2 Buffered Outputs | 3-state outputs with same internal series resistance; supports bidirectional bus isolation |
| GND, 10 | Ground Reference | Primary return path for all I/O and supply currents; requires low-impedance PCB connection |
| VCC, 20 | Power Supply | 5-V nominal supply; decoupling capacitor (0.1 µF ceramic) required within 1 cm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω series output resistors | Eliminates need for external termination components on PCB, reducing BOM count and layout area |
| High-impedance during power sequencing | Prevents bus contention at power-up/down when VCC is between 0 and 2.1 V |
| EPIC-IIB BiCMOS process | Combines bipolar speed and CMOS low static power - typical ICC = 24 mA (all outputs low) at VCC = 5.5 V |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD-17 - ensures robustness against transient overcurrent events |
| Output ground bounce (VOLP) | <1 V typical at VCC = 5 V - minimizes noise coupling into adjacent signals during switching |
Applications
| Memory Address Buffering | System Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 20-bit address lines from a microcontroller to SRAM or Flash memory in embedded control systems. IC Role / Device Role / Timing Role: Noninverting octal buffer providing fan-out expansion and level-shifting between controller and memory ICs. Use Value: Integrated 25-Ω resistors suppress ringing on long address traces, improving setup/hold timing margins without discrete termination. | Use Scenario: Isolating CPU data bus from peripheral modules (e.g., UART, ADC, GPIO expanders) in industrial PLC backplanes. IC Role / Device Role / Timing Role: Dual-group 3-state driver enabling time-multiplexed bidirectional data flow across shared bus segments. Use Value: Independent OE pins allow precise control of bus arbitration windows, preventing contention during read/write transitions. |
| Clock Distribution Network | Legacy Peripheral Interface |
Use Scenario: Distributing a 25-MHz system clock to multiple synchronous peripherals (e.g., timers, PWM generators) in motor control boards. IC Role / Device Role / Timing Role: Low-skew noninverting buffer with matched propagation delays across all eight outputs. Use Value: Propagation delay variation ≤0.9 ns (tPHL–tPLH) ensures tight skew control critical for synchronous sampling accuracy. | Use Scenario: Interfacing modern microcontrollers with legacy parallel peripherals such as dot-matrix LCD controllers or stepper motor drivers. IC Role / Device Role / Timing Role: Level-translating and fan-out buffer supporting TTL-compatible input thresholds and 12-mA drive strength. Use Value: Guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V ensure reliable recognition of older peripheral logic states despite voltage droop or noise. |
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 |
|---|---|---|---|
| SN74ABT2244ADWR | SOIC-20 package (DW), same electrical specs, surface-mount only | Requires reflow assembly; unsuitable for through-hole prototyping or repair | Select when board space is constrained and automated SMT production is used |
| SN74ABT2244APWR | TSSOP-20 package (PW), identical functionality, thinner profile (1.2 mm max height) | Higher pin density; more sensitive to solder bridging and mechanical stress than PDIP | Choose for compact portable electronics where Z-height and footprint are critical |
Compared with SN74ABT2244ADWR and SN74ABT2244APWR, the SN74ABT2244AN offers direct compatibility with hand-soldered prototypes, legacy test fixtures, and through-hole production lines - its PDIP-20 footprint provides mechanical robustness and thermal mass advantageous in thermally demanding industrial environments.
Availability
SN74ABT2244AN is available at Aetrix Electronics and suitable for memory subsystem buffering, industrial bus interface design, and legacy peripheral interfacing requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT2244AN 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 SN74ABT2244AN belongs to TI's ABT logic family - engineered for high-speed 3-state bus driving in 5-V systems where signal integrity, power efficiency, and interoperability with legacy TTL interfaces are essential.
FAQ
What is the maximum operating temperature range for the SN74ABT2244AN?
The SN74ABT2244AN is characterized for operation from –40°C to +85°C. This industrial temperature range ensures reliable performance in demanding environments such as factory automation controllers, motor drives, and outdoor communication equipment where ambient temperatures exceed commercial-grade limits. The device maintains full specification compliance across this entire range without derating.
Does the SN74ABT2244AN require external pull-up resistors on its OE pins?
Yes - to guarantee high-impedance output state when VCC exceeds 2.1 V, OE pins (1OE and 2OE) must be tied to VCC through external pull-up resistors. The minimum resistor value depends on the current-sinking capability of the controlling driver; TI recommends verifying pull-up strength using the IOH specification (–24 mA min) to ensure valid logic-high levels under worst-case loading.
How does the built-in 25-Ω series resistor affect signal integrity in the SN74ABT2244AN?
The SN74ABT2244AN integrates 25-Ω series resistors at each output to dampen signal reflections caused by impedance mismatches on PCB traces. This reduces overshoot and undershoot without requiring discrete termination components, simplifying layout and improving timing margins in high-speed digital buses - especially beneficial for medium-length (≤10 cm) traces operating above 25 MHz.
Can the SN74ABT2244AN drive standard TTL loads directly?
Yes - the SN74ABT2244AN can drive up to 10 standard TTL loads per output, verified by its guaranteed 12-mA sink current (IOL) and compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). Its output voltage levels (VOL ≤ 0.8 V, VOH ≥ 2.5 V at IO = ±3 mA) meet or exceed TTL specifications, ensuring interoperability without level-shifting circuitry.
What is the purpose of the separate 1OE and 2OE control inputs in the SN74ABT2244AN?
The SN74ABT2244AN features two independent active-low output-enable inputs (1OE on pin 19, 2OE on pin 2) to provide granular control over its two 4-bit buffer groups. This allows selective activation of Group 1 (1A→1Y) and Group 2 (2A→2Y) outputs - enabling time-multiplexed bus sharing, partial system power-down, or fault-isolation strategies without affecting the entire 8-bit path.
SN74ABT2244AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- 32mA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ABT2244AN FAQ
1.How can I place an order for SN74ABT2244AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2244AN 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 SN74ABT2244AN reliable?
The price and inventory of SN74ABT2244AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2244AN is usually 5 days.
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SN74ABT2244AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT2244AN 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 SN74ABT2244AN?
For technical support, including SN74ABT2244AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2244AN requirements.
6.How does Aetrix verify that SN74ABT2244AN is sourced from the original manufacturer or authorized distributors?
All SN74ABT2244AN 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 SN74ABT2244AN meets industry standards.
7.What is the process for return or replacement of SN74ABT2244AN?
All SN74ABT2244AN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2244AN, 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 SN74ABT2244AN part is unused and in its original packaging.
Return procedure for SN74ABT2244AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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