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Texas Instruments SN74ABT244ADWR
- Part No.:
- SN74ABT244ADWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT244ADWR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,760
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Product details
Overview
SN74ABT244ADWR from Texas Instruments is an octal noninverting 3-state buffer/line driver IC designed for memory address, clock, and bus-oriented applications. It features two independent 4-bit channels with separate active-low output-enable (OE) inputs, high-drive capability (−32 mA IOH / 64 mA IOL), 5-V supply operation, and SOIC-20 (DW) package. Used in industrial control backplanes and data acquisition systems requiring robust signal integrity.
For engineers reviewing the SN74ABT244ADWR datasheet, SN74ABT244ADWR pinout, SN74ABT244ADWR application, or SN74ABT244ADWR equivalent, key selection criteria include its 3-state bus interface capability, latch-up immunity (>500 mA), ESD protection (>2000 V HBM), and guaranteed operation from −40°C to 85°C.
Technical Context
This BiCMOS device implements symmetrical active-low OE control per channel, enabling independent high-impedance state management for bidirectional bus isolation. Its EPIC-IIB design reduces power dissipation while maintaining TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and fast propagation delays (tPLH/tPHL ≤ 4.6 ns at 5 V).
Output ground bounce (VOLP) is specified <1 V at VCC = 5 V and TA = 25°C, and the device supports hot-swap compatibility when OE is pulled up to VCC via external resistor. Unused inputs must be held static to prevent floating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across standard 5-V logic rails with margin for ripple. |
| High-Level Output Current | −32 mA - drives heavy capacitive loads or multiple TTL inputs without signal degradation. |
| Low-Level Output Current | 64 mA - sinks current for active pull-down in bus contention scenarios. |
| Propagation Delay | ≤ 4.6 ns - enables reliable timing in high-speed address/data paths up to ~200 MHz. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - fully compatible with standard TTL and 5-V CMOS logic families. |
| ESD Protection | >2000 V HBM - meets MIL-STD-883 Method 3015 for handling robustness in manufacturing and field service. |
| Latch-Up Immunity | >500 mA - exceeds JEDEC JESD-17, preventing destructive latch-up during transient overcurrent events. |
Pinout & Package
SN74ABT244ADWR is housed in a 20-pin SOIC (DW) package measuring 12.8 mm × 7.5 mm × 2.35 mm, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls high-impedance state of respective 4-bit channel; tie to VCC via pullup for power-up safety. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for Channel 1 (pins 2,4,6,8) and Channel 2 (pins 19,13,15,17). |
| 1Y1–1Y4, 2Y1–2Y4 | Buffered outputs | Corresponding noninverted outputs (pins 18,16,14,12 and 9,7,5,3); tri-state when OE high. |
| VCC (pin 10) | Power supply | 5-V nominal supply; decoupling capacitor required near pin for noise suppression. |
| GND (pin 20) | Ground reference | Common return path for all signals and power; low-inductance connection critical for VOLP control. |
Key Features
| Feature | Design Value |
|---|---|
| State-of-the-art EPIC-IIB BiCMOS process | Reduces dynamic power vs. pure bipolar while retaining high drive strength and speed. |
| High-drive outputs | −32 mA source / +64 mA sink capability supports fan-out to ≥10 standard TTL loads. |
| Output ground bounce control | VOLP < 1 V ensures signal integrity during simultaneous switching of multiple outputs. |
| Robust reliability specs | Latch-up immunity >500 mA and ESD >2000 V HBM simplify system-level ESD design. |
| Multiple package options | DW (SOIC-20) variant offers proven manufacturability and thermal performance (θJA = 97°C/W). |
Applications
| Industrial Backplane Interface | Memory Address Buffering |
|---|---|
Use Scenario: Isolating CPU address lines from multiple peripheral modules on a shared 16-bit backplane. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing bidirectional address isolation with independent channel enables. Use Value: Prevents bus contention during module hot-swap and reduces address skew with sub-5 ns propagation delay. | Use Scenario: Driving address inputs of multiple SRAM chips in a microcontroller-based data logger. IC Role / Device Role / Timing Role: High-current address line driver ensuring clean signal edges into parallel memory inputs. Use Value: 64-mA sink capability maintains VIH/VIL margins across 8+ SRAM devices under worst-case trace capacitance. |
| Programmable Logic I/O Expansion | Legacy Bus Signal Conditioning |
Use Scenario: Extending FPGA GPIO count to interface with legacy 5-V parallel peripherals (e.g., ADCs, DACs). IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening buffer between 3.3-V FPGA I/O and 5-V peripheral buses. Use Value: TTL-compatible input thresholds accept 3.3-V logic highs; high drive compensates for long PCB traces. | Use Scenario: Replacing aging 74LS244 in repair of industrial PLC I/O modules. IC Role / Device Role / Timing Role: Pin-compatible upgrade delivering faster timing, lower power, and improved noise immunity. Use Value: Identical pinout and function with 2× speed improvement and integrated ESD/latch-up protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | 3.3-V only supply (1.65–3.6 V); lower drive (−24/+24 mA); CMOS process. | Not suitable for 5-V bus interfaces; requires level translation if interfacing with 5-V peripherals. | Select when system operates entirely at 3.3 V and lower power is prioritized over drive strength. |
| SN74ACT244N | 5-V supply; TTL-compatible; higher ICC (30 mA typical); no BiCMOS power optimization. | Higher static power draw; less robust ESD (2000 V HBM same, but no latch-up spec cited). | Choose for legacy designs where ACT family qualification is mandated and BiCMOS benefits are secondary. |
Compared with SN74LVC244APWR and SN74ACT244N, the SN74ABT244ADWR uniquely balances 5-V bus compatibility, high drive, low dynamic power, and industry-leading latch-up immunity-making it optimal for industrial backplane and memory interface applications demanding reliability and signal fidelity.
Availability
SN74ABT244ADWR is available at Aetrix Electronics and suitable for industrial control backplanes, memory address buffering, programmable logic I/O expansion, and legacy bus signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SN74ABT244ADWR 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 industrial-grade product development expertise.
The SN74ABT244ADWR belongs to TI's ABT logic family, engineered for high-speed, high-drive 5-V bus interface applications where signal integrity, latch-up immunity, and system-level ESD robustness are critical.
FAQ
What is the maximum operating temperature range for the SN74ABT244ADWR?
The SN74ABT244ADWR is characterized for operation from −40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in factory automation, motor control, and outdoor instrumentation environments where thermal cycling occurs. The DW package's θJA of 97°C/W allows adequate thermal headroom at full drive load within this range.
Can the SN74ABT244ADWR be used as a direct replacement for the older SN74LS244N?
Yes, the SN74ABT244ADWR is pin-compatible and functionally equivalent to SN74LS244N, with identical pinout and noninverting 3-state behavior. However, it delivers significantly higher drive (64 mA vs. 8 mA sink), faster propagation (<4.6 ns vs. ~15 ns), lower power dissipation, and enhanced reliability (latch-up >500 mA, ESD >2000 V). No PCB changes are required for drop-in replacement.
How should unused inputs be handled on the SN74ABT244ADWR?
Unused inputs on the SN74ABT244ADWR must be held static-either tied to VCC or GND-to prevent floating. Floating inputs can cause increased ICC, unpredictable output states, or oscillation due to noise coupling. TI explicitly specifies this in the recommended operating conditions (Note 3), and failure to comply may degrade timing margins or increase power consumption.
What is the purpose of the OE pin configuration on the SN74ABT244ADWR?
The SN74ABT244ADWR has two independent active-low output-enable pins (1OE and 2OE), each controlling one 4-bit channel. When OE is low, the corresponding A→Y path is enabled; when high, outputs go high-impedance. This enables selective bus isolation-for example, allowing Channel 1 to drive while Channel 2 remains tri-stated-critical for multiplexed address/data routing in complex systems.
Does the SN74ABT244ADWR require external pull-up resistors on OE pins?
Yes, TI recommends tying OE pins to VCC through a pull-up resistor to ensure high-impedance state during power-up or power-down transients. The minimum resistor value depends on the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ. This prevents unintended output activation before system initialization completes, avoiding bus conflicts.
SN74ABT244ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ABT244ADWR FAQ
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Please submit a Request for Quotation (RFQ) for SN74ABT244ADWR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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5.How can I obtain technical support or documentation for SN74ABT244ADWR?
For technical support, including SN74ABT244ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT244ADWR requirements.
6.How does Aetrix verify that SN74ABT244ADWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT244ADWR 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 SN74ABT244ADWR meets industry standards.
7.What is the process for return or replacement of SN74ABT244ADWR?
All SN74ABT244ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT244ADWR, 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 SN74ABT244ADWR part is unused and in its original packaging.
Return procedure for SN74ABT244ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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