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Texas Instruments SN74ABT244ADBRG4
- Part No.:
- SN74ABT244ADBRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT244ADBRG4.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74ABT244ADBRG4 from Texas Instruments is an octal noninverting 3-state buffer/line driver in a 20-pin SSOP (DB) package, operating at 4.5–5.5 V with high-drive outputs (−32 mA IOH, 64 mA IOL), low propagation delay (tPLH/tPHL ≤ 4.6 ns), and robust ESD protection (>2000 V per MIL-STD-883). It enables bidirectional bus interfacing in memory address and clock distribution systems.
For engineers reviewing the SN74ABT244ADBRG4 datasheet, SN74ABT244ADBRG4 pinout, SN74ABT244ADBRG4 application, or SN74ABT244ADBRG4 equivalent, key selection criteria include 3-state output control timing (tPZL/tPHZ ≤ 6.1 ns), latch-up immunity (>500 mA), ground bounce performance (VOLP < 1 V), and compatibility with 5-V TTL/CMOS logic families in space-constrained industrial PCBs.
Technical Context
The SN74ABT244ADBRG4 implements two independent 4-bit noninverting buffer sections, each with dedicated active-low output-enable (OE) inputs. Its EPIC-II™B BiCMOS architecture delivers low power dissipation while maintaining TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and rail-to-rail output swing under load.
Each buffer supports symmetrical 3-state control: when OE is low, data passes transparently from A inputs to Y outputs; when OE is high, outputs enter high-impedance state. Power-up/down sequencing requires OE tied to VCC via pullup resistor to guarantee defined initial state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V logic rails and tolerance against supply ripple. |
| Output drive | −32 mA IOH / 64 mA IOL - drives heavy capacitive loads (e.g., long traces, multiple inputs) without signal degradation. |
| Propagation delay | tPLH/tPHL ≤ 4.6 ns @ CL = 50 pF - enables high-speed bus operation up to ~200 MHz system clock domains. |
| 3-state enable/disable | tPZL ≤ 6.1 ns, tPHZ ≤ 6.6 ns - minimizes bus contention windows during direction switching in shared-data-path systems. |
| Input threshold | VIH = 2.0 V, VIL = 0.8 V - guarantees reliable recognition of TTL-level signals across temperature (−40°C to 85°C). |
| ESD rating | >2000 V HBM - withstands handling and board assembly electrostatic events without functional impairment. |
| Latch-up immunity | >500 mA per JEDEC JESD-17 - prevents destructive latch-up during transient overvoltage or hot-swap conditions. |
Pinout & Package
SN74ABT244ADBRG4 uses a 20-pin Shrink Small-Outline Package (SSOP, DB), 7.5 mm × 5.6 mm body, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls 3-state behavior for respective 4-bit sections; must be pulled high at power-up to avoid bus contention. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for two independent 4-bit channels; accept standard TTL/CMOS logic levels. |
| 1Y1–1Y4, 2Y1–2Y4 | Buffered outputs | High-drive, 3-state outputs; sink/source capability supports fanout >10 to 5-V CMOS loads. |
| VCC (Pin 20) | Power supply | 5-V nominal supply; decoupling capacitor required within 1 cm to suppress switching noise. |
| GND (Pin 10) | Ground reference | Common return path; low-inductance connection critical for ground bounce reduction (VOLP < 1 V). |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-II™B BiCMOS process | Reduces dynamic power vs. pure bipolar while retaining TTL speed and drive strength. |
| High-impedance output control | Dedicated OE pins per 4-bit group allow independent bus segment isolation in multi-master systems. |
| Output ground bounce suppression | VOLP < 1 V at VCC = 5 V ensures signal integrity during simultaneous output switching. |
| Robust thermal design | θJA = 115°C/W (DB package) enables operation at full drive in ambient up to 85°C without derating. |
| Wide temperature range | Specified from −40°C to +85°C - suitable for industrial automation, telecom line cards, and embedded controllers. |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
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 from memory device inputs; OE synchronized with memory select strobes. Use Value: Prevents address bus contention during memory access arbitration; high drive strength maintains edge rate across 10+ cm PCB traces. | Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., ADC, DAC, FPGA config logic). IC Role / Device Role / Timing Role: Fanout buffer replicating clock signal with matched propagation delay across all outputs. Use Value: Delivers <4.6 ns skew between Y outputs, minimizing clock domain misalignment in time-critical sampling systems. |
| Bus Transceiver Interface | Legacy Peripheral Expansion |
Use Scenario: Bidirectional data transfer between a 32-bit processor bus and external I/O modules using shared data lines. IC Role / Device Role / Timing Role: Direction-controlled buffer enabling half-duplex communication; OE toggled by processor's RD/WR control logic. Use Value: Eliminates need for discrete transceivers; 64-mA sink current handles legacy TTL bus loading without external pullups. | Use Scenario: Connecting ISA-style parallel port peripherals (e.g., printers, PLC I/O) to modern microcontroller-based host boards. IC Role / Device Role / Timing Role: Level-shifting and drive-boosting interface between 3.3-V MCU GPIO and 5-V peripheral signaling standards. Use Value: TTL-compatible input thresholds accept 3.3-V logic highs; 5-V tolerant outputs drive legacy 5-V peripherals directly. |
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 input thresholds. | Not suitable for 5-V bus interfacing; requires level translation for mixed-voltage systems. | Select when system operates exclusively at 3.3 V and lower power is prioritized over drive strength. |
| SN74ACT244N | PDIP-20 package; identical 5-V operation but higher ICC (30 mA max); no RoHS compliance. | Through-hole mounting only; unsuitable for automated SMT assembly or space-constrained designs. | Select only for legacy through-hole prototyping or repair where SSOP footprint is incompatible. |
Compared with SN74LVC244APWR and SN74ACT244N, the SN74ABT244ADBRG4 uniquely balances 5-V TTL compatibility, high-current drive, SSOP packaging, and RoHS compliance-making it optimal for industrial bus buffering where signal integrity and mixed-logic interfacing are critical.
Availability
SN74ABT244ADBRG4 is available at Aetrix Electronics and suitable for industrial control systems, telecom infrastructure equipment, and embedded computing platforms requiring stable component supply and long-term manufacturability.
Supply support for SN74ABT244ADBRG4 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 heritage in high-reliability interface ICs.
The ABT logic family-including SN74ABT244ADBRG4-is engineered for high-speed, high-drive 5-V bus applications in industrial, communications, and computing systems where signal fidelity and noise immunity are essential.
FAQ
What is the maximum operating temperature range for the SN74ABT244ADBRG4?
The SN74ABT244ADBRG4 is rated for operation from −40°C to +85°C, making it suitable for industrial environments where ambient temperatures exceed consumer-grade limits. This range is validated per JEDEC JESD78 and confirmed in the device's recommended operating conditions table. The SN74ABT244ADBRG4 maintains full electrical specifications-including propagation delay and drive strength-across this entire range.
Does the SN74ABT244ADBRG4 require external pull-up resistors on its OE pins?
Yes, to ensure the outputs remain in high-impedance state during power-up or power-down, OE pins on the SN74ABT244ADBRG4 must be tied to VCC via external pull-up resistors. The minimum resistance value depends on the current-sinking capability of the driving control signal; typical values range from 4.7 kΩ to 10 kΩ. This requirement is explicitly stated in the device's functional description and prevents undefined bus states.
Can the SN74ABT244ADBRG4 interface directly with 3.3-V logic inputs?
No-the SN74ABT244ADBRG4 has TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and is designed for 5-V systems. While 3.3-V logic high (typically 2.4–3.3 V) may register as valid VIH, marginal cases near 2.0 V risk misinterpretation. For guaranteed interoperability with 3.3-V controllers, use a level translator or select a dual-supply buffer like SN74AVC244.
What is the thermal resistance (θJA) of the SN74ABT244ADBRG4 in its DB package?
The SN74ABT244ADBRG4 in the SSOP (DB) package has a junction-to-ambient thermal resistance (θJA) of 115°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC test board conditions (2-layer board, 1-in² copper pad). Actual θJA in end-user PCBs will vary based on copper area, airflow, and adjacent heat sources-but 115°C/W provides a conservative basis for thermal margining.
Is the SN74ABT244ADBRG4 pin-compatible with other members of the SN74ABT244 family?
Yes-the SN74ABT244ADBRG4 shares identical pinout, function, and timing with all SN74ABT244A variants in the DB, DW, NS, and PW packages (e.g., SN74ABT244ADBR, SN74ABT244ADWR). Differences are limited to packaging, reel quantity, and marking; electrical behavior and logic function are fully interchangeable. This allows drop-in replacement across SSOP-based designs without layout changes.
SN74ABT244ADBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
SN74ABT244ADBRG4 FAQ
1.How can I place an order for SN74ABT244ADBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT244ADBRG4 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 SN74ABT244ADBRG4 reliable?
The price and inventory of SN74ABT244ADBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT244ADBRG4 is usually 5 days.
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Once your SN74ABT244ADBRG4 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 SN74ABT244ADBRG4?
For technical support, including SN74ABT244ADBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT244ADBRG4 requirements.
6.How does Aetrix verify that SN74ABT244ADBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT244ADBRG4 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 SN74ABT244ADBRG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT244ADBRG4?
All SN74ABT244ADBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT244ADBRG4, 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 SN74ABT244ADBRG4 part is unused and in its original packaging.
Return procedure for SN74ABT244ADBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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