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Texas Instruments SN74ABT244ADB
- Part No.:
- SN74ABT244ADB
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT244ADB.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:464
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Product details
Overview
SN74ABT244ADB from Texas Instruments is a dual 4-bit noninverting 3-state buffer/line driver in SSOP-20 package, designed for memory address and bus interface applications. It delivers high-drive outputs (−32 mA IOH, 64 mA IOL), operates at 4.5–5.5 V, supports −40°C to 85°C industrial temperature range, and features low output ground bounce (<1 V) and robust ESD protection (>2000 V HBM).
For engineers reviewing the SN74ABT244ADB datasheet, SN74ABT244ADB pinout, SN74ABT244ADB application, or SN74ABT244ADB equivalent, this page provides verified electrical specs, validated pin functions, real-world use cases in bus buffering and clock distribution, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The SN74ABT244ADB implements two independent 4-bit noninverting buffers, each controlled by a dedicated active-low output-enable (OE) input. Its EPIC-II™ BiCMOS process enables symmetrical drive strength and fast switching-typical tPLH/tPHL = 2.6/2.9 ns at 5 V with 50-pF load.
Each buffer passes data from A inputs to Y outputs when OE is low; outputs enter high-impedance state when OE is high. To ensure defined state during power sequencing, OE must be pulled up to VCC via external resistor, sized per driver sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL and CMOS logic rails |
| Output Drive | −32 mA IOH / +64 mA IOL - sufficient to drive heavy capacitive loads and multiple TTL inputs |
| Propagation Delay | 1 ns min / 4.6 ns max (A→Y, VCC=5 V, TA=25°C) - enables high-speed bus timing budgets |
| Enable Timing | tPZL = 2.1–6.1 ns, tPHZ = 1.8–6.6 ns - ensures clean bus release and acquisition windows |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - TTL-compatible input logic levels for seamless interfacing |
| Thermal Resistance | θJA = 115°C/W (DB package) - defines maximum power dissipation under natural convection |
| ESD Rating | >2000 V HBM - meets MIL-STD-883 Method 3015 for handling robustness |
Pinout & Package
SN74ABT244ADB uses a 20-pin Shrink Small-Outline Package (SSOP-DB) with 0.65-mm lead pitch, 6.6 mm × 4.5 mm body, and 1.2-mm max height per JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls Y1–Y4 and Y1'–Y4' groups independently; must be pulled high for high-Z on power-up |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for respective 4-bit buffer sections |
| 1Y1–1Y4, 2Y1–2Y4 | Buffered outputs | 3-state outputs with high-drive capability; tolerate 5.5-V off-state voltage |
| GND (Pin 10) | Ground reference | Primary return path for all I/O and internal circuitry |
| VCC (Pin 20) | Power supply | 5-V supply rail; decoupling capacitor required within 1 cm of pin |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | Delivers −32 mA sink / +64 mA source to maintain signal integrity across long PCB traces or loaded buses |
| Low Ground Bounce | VOLP < 1 V at VCC = 5 V - minimizes noise coupling into shared ground planes during simultaneous switching |
| Latch-Up Immunity | Exceeds 500 mA per JESD-17 - prevents destructive latch-up under transient overvoltage conditions |
| 3-State Control Logic | Dedicated OE pins per 4-bit section allow selective bus arbitration without external logic |
| BiCMOS Process | EPIC-II™ architecture reduces static power vs. pure bipolar while retaining speed and drive |
Applications
| Memory Address Buffering | System Bus Interface |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs and enabling multi-drop addressing. Use Value: High drive strength ensures setup/hold timing margins are met across 10+ cm traces with 50-pF load per device. | Use Scenario: Interfacing a 16-bit data bus between an FPGA and peripheral ICs with mismatched drive capabilities. IC Role / Device Role / Timing Role: Bidirectional bus driver providing level-shifting isolation and contention control via OE signals. Use Value: Independent OE pins allow dynamic direction control and prevent bus conflicts during read/write transitions. |
| Clock Distribution | Legacy Peripheral Expansion |
Use Scenario: Fan-out of a system clock to multiple synchronous peripherals (e.g., ADCs, DACs, UARTs). IC Role / Device Role / Timing Role: Low-skew, noninverting buffer replicating clock edges with minimal jitter addition. Use Value: Propagation delay matching (tPLH ≈ tPHL) and low ground bounce preserve clock edge fidelity across fan-out paths. | Use Scenario: Adding ISA or LPC-compatible parallel I/O expansion to modern embedded controllers. IC Role / Device Role / Timing Role: TTL-compatible bus transceiver enabling legacy peripheral communication with 3.3-V or 5-V hosts. Use Value: 0.8-V/2.0-V input thresholds and 5.5-V-tolerant outputs support mixed-voltage backplane designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244ADWR | SOIC-20 package (7.5-mm width vs. DB's 4.5 mm); θJA = 97°C/W vs. 115°C/W | Preferred for through-hole prototyping or legacy board rework where SSOP footprint unavailable | Select when board space allows wider SOIC or thermal margin exceeds 20°C/W requirement |
| SN74LVC244APWR | 3.3-V only (1.65–3.6 V); lower drive (−24/+24 mA); CMOS process; 1.5-V logic thresholds | Requires level translation for 5-V systems; unsuitable for direct TTL replacement | Choose only for new 3.3-V designs prioritizing ultra-low static power and smaller TSSOP-20 footprint |
Compared with SN74ABT244ADWR, the SN74ABT244ADB offers 30% smaller PCB area and higher thermal resistance, making it optimal for space-constrained industrial modules; versus SN74LVC244APWR, it maintains full 5-V TTL compatibility and 2.7× stronger drive but consumes more quiescent current.
Availability
SN74ABT244ADB is available at Aetrix Electronics and suitable for memory subsystems, industrial bus interfaces, clock distribution networks, and legacy peripheral expansion requiring stable component supply and long-term industrial temperature support.
Supply support for SN74ABT244ADB 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 SN74ABT244ADB belongs to TI's ABT logic family, engineered for high-speed, high-drive 5-V bus interface applications where signal integrity, noise immunity, and industrial temperature operation are critical.
FAQ
What is the recommended pull-up resistor value for OE pins on the SN74ABT244ADB?
The OE pins on the SN74ABT244ADB should be pulled up to VCC using a resistor sized to ensure reliable high-level assertion during power-up. Based on the maximum input leakage current (±1 µA) and minimum VIH (2.0 V), a 10-kΩ resistor provides sufficient margin while limiting current draw. For noisy environments, a 4.7-kΩ resistor improves noise immunity without exceeding drive capability limits.
Does the SN74ABT244ADB support hot-swap or live-insertion?
The SN74ABT244ADB does not include explicit hot-swap protection features such as power-on reset or Ioff partial-power-down mode. Its Ioff specification (±100 µA at VCC = 0 V) limits current flow when unpowered, but bus contention during insertion remains possible. For true hot-swap operation, external series resistors or dedicated hot-swap controllers are required alongside the SN74ABT244ADB.
Can the SN74ABT244ADB drive a 50-pF load at 25 MHz without signal degradation?
Yes - the SN74ABT244ADB is characterized for CL = 50 pF and achieves typical propagation delays of 2.6 ns (tPLH) and 2.9 ns (tPHL) at 5 V and 25°C. With rise/fall times under 3 ns and high drive strength, it reliably meets setup/hold timing for 25-MHz bus clocks. Layout best practices (short traces, ground plane, local decoupling) are essential to maintain signal integrity.
What is the maximum continuous output current per pin for the SN74ABT244ADB?
The SN74ABT244ADB supports up to 64 mA sink current (IOL) and −32 mA source current (IOH) per output pin under recommended operating conditions. However, total device ICC must remain within limits: 30 mA for all outputs low, 250 µA for all outputs disabled. Simultaneous switching of more than four outputs at full drive requires thermal derating per θJA = 115°C/W.
Is the SN74ABT244ADB RoHS compliant and lead-free?
Yes - the SN74ABT244ADB is RoHS compliant and lead-free, with "Green (RoHS & no Sb/Br)" eco plan, CU NIPDAU lead finish, and Level-1 moisture sensitivity rating (260°C peak reflow). The part marking "AB244A" appears on the top surface, and full compliance documentation is available via Texas Instruments' Quality & Environmental page.
SN74ABT244ADB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- 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, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74ABT244ADB FAQ
1.How can I place an order for SN74ABT244ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT244ADB 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 SN74ABT244ADB reliable?
The price and inventory of SN74ABT244ADB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT244ADB is usually 5 days.
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Once your SN74ABT244ADB 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 SN74ABT244ADB?
For technical support, including SN74ABT244ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT244ADB requirements.
6.How does Aetrix verify that SN74ABT244ADB is sourced from the original manufacturer or authorized distributors?
All SN74ABT244ADB 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 SN74ABT244ADB meets industry standards.
7.What is the process for return or replacement of SN74ABT244ADB?
All SN74ABT244ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT244ADB, 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 SN74ABT244ADB part is unused and in its original packaging.
Return procedure for SN74ABT244ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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