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Texas Instruments SN74ABT244ADBR
- Part No.:
- SN74ABT244ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT244ADBR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,350
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Product details
Overview
SN74ABT244ADBR from Texas Instruments is a noninverting octal buffer/line driver with two independent 4-bit sections, 3-state outputs, and high-drive capability (−32 mA IOH, 64 mA IOL) for memory address and bus interface applications operating at 4.5–5.5 V. It features low ground bounce (<1 V VOLP), latch-up immunity (>500 mA), and ESD protection (>2000 V HBM). Designed for industrial temperature range (−40°C to 85°C), it supports dense bus-oriented systems requiring fast, robust signal buffering.
For engineers reviewing the SN74ABT244ADBR datasheet, SN74ABT244ADBR pinout, SN74ABT244ADBR application, or SN74ABT244ADBR equivalent, this page delivers verified electrical specs, package dimensions, functional truth table, real-world use cases in memory and clock distribution, and validated alternative options for sourcing continuity and design flexibility.
Technical Context
The SN74ABT244ADBR implements EPIC-II™ BiCMOS logic architecture to achieve high-speed switching (tPLH/tPHL ≤ 4.6 ns @ 5 V, CL = 50 pF) while reducing power dissipation versus standard TTL. Its dual 4-bit structure provides symmetrical active-low output-enable (OE) inputs per section, enabling independent control of Y1–Y4 and Y1–Y4 outputs.
Each buffer operates with TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max), rail-to-rail output swing (VOH ≥ 2 V @ −32 mA, VOL ≤ 0.55 V @ 64 mA), and high-impedance state control via OE. Power-up/down sequencing requires OE tied to VCC through a pullup resistor to ensure defined 3-state behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V logic systems and tolerance against supply ripple. |
| Output Drive | −32 mA IOH / 64 mA IOL - enables direct driving of heavy capacitive loads or multiple TTL inputs without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 4.6 ns @ 5 V - supports high-speed bus operation up to ~200 MHz data rates in short trace configurations. |
| Input Thresholds | VIH = 2 V min, VIL = 0.8 V max - guarantees reliable interfacing with legacy TTL and mixed-voltage logic families. |
| Thermal Resistance | θJA = 115°C/W (DB package) - defines maximum power dissipation limit under natural convection for thermal design margining. |
| ESD Rating | 2000 V HBM - meets industrial handling requirements without additional board-level protection circuitry. |
| Latch-Up Immunity | >500 mA per JESD-17 - prevents destructive current flow during transient overvoltage events on I/O pins. |
Pinout & Package
SN74ABT244ADBR uses a 20-pin Shrink Small-Outline Package (SSOP-DB) with 0.65 mm lead pitch, 6.6 mm × 4.5 mm body size, and 1.2 mm max height per JEDEC MO-153. Pin 1 is located at top-left corner with index area marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls 3-state output of respective 4-bit section; must be pulled high for high-Z during power transitions. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for each buffer channel; accept TTL-level signals with 3.5 pF typical input capacitance. |
| 1Y1–1Y4, 2Y1–2Y4 | Buffered outputs | High-drive, 3-state outputs with 7.5 pF typical load capacitance; support bus sharing and hot-swap isolation. |
| VCC, GND | Power supply | Single 5-V supply rail; decoupling capacitor required within 1 cm of VCC/GND pins to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-II™ BiCMOS process | Reduces dynamic power by >40% vs. bipolar TTL while maintaining full 5-V drive strength and speed. |
| High-current outputs | Delivers −32 mA sink/source capability - eliminates need for external drivers in memory address or data bus fanout. |
| Low ground bounce | VOLP < 1 V @ 5 V - minimizes noise coupling into adjacent signals and improves signal integrity in dense PCB layouts. |
| Robust ESD/latch-up | 2000 V HBM ESD rating and >500 mA latch-up immunity - reduces field failure risk in manufacturing and end-use environments. |
| Industrial temp range | −40°C to +85°C operation - qualified for deployment in industrial control, networking, and embedded computing equipment. |
Applications
| Memory Address Buffering | System 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 octal buffer isolating MCU address outputs and providing fanout gain to meet loading requirements of parallel memory arrays. Use Value: Enables single MCU to address >8 memory chips simultaneously while maintaining setup/hold timing margins due to sub-5 ns propagation delay. | Use Scenario: Distributing a master system clock to multiple peripheral ICs (e.g., ADCs, DACs, UARTs) across a PCB. IC Role / Device Role / Timing Role: Low-skew, high-drive clock buffer ensuring synchronized edge delivery to multiple receivers with matched trace lengths. Use Value: Prevents clock skew-induced metastability by delivering clean, high-current edges with <1 V ground bounce, critical for multi-device timing alignment. |
| Bus Transceiver Interface | Legacy TTL Signal Translation |
Use Scenario: Bidirectional data bus isolation between processor and peripheral modules using separate OE controls. IC Role / Device Role / Timing Role: Dual-section 3-state buffer allowing independent enable/disable of upstream/downstream data paths on shared bus segments. Use Value: Supports hot-plug capability and fault containment - disabling one section prevents contention while other remains active. | Use Scenario: Interfacing modern microcontrollers with legacy TTL-based peripherals (e.g., 74LS-series logic, older display controllers). IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening buffer converting CMOS-level outputs to robust TTL-compatible signals. Use Value: Ensures reliable logic recognition at receiver inputs despite voltage drop across long traces, thanks to 64 mA IOL and 2 V VIH minimum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244ADWR | Same logic function and specs, but in SOIC-DW package (7.5 mm × 12.8 mm, 1.75 mm height) instead of SSOP-DB (4.5 mm × 6.6 mm, 1.2 mm height). | Requires PCB layout change due to larger footprint and different lead pitch (1.27 mm vs. 0.65 mm); better thermal performance (θJA = 97°C/W). | Select when board space allows larger package and higher thermal margin is prioritized over density. |
| SN74LVC244APWR | Lower voltage operation (1.65–3.6 V), lower drive (−24 mA / 24 mA), and CMOS input structure - not pin-compatible; requires level-shifting for 5-V systems. | Suitable only for 3.3-V or mixed-voltage designs; incompatible with pure 5-V buses without translation. | Choose only for new low-voltage designs; not a drop-in replacement for SN74ABT244ADBR in existing 5-V infrastructure. |
Compared with SN74ABT244ADWR and SN74LVC244APWR, the SN74ABT244ADBR uniquely balances ultra-compact SSOP packaging, full 5-V TTL compatibility, and industrial-grade drive strength - making it optimal for space-constrained, legacy-bus-critical applications where pin-for-pin replacement and proven reliability are mandatory.
Availability
SN74ABT244ADBR is available at Aetrix Electronics and suitable for memory subsystems, industrial bus interfaces, clock distribution networks, and legacy TTL interoperability applications requiring stable component supply and long-term production continuity.
Supply support for SN74ABT244ADBR 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 logic families.
The SN74ABT244ADBR belongs to TI's ABT logic series - engineered for high-speed, high-drive 5-V bus interface applications where signal integrity, noise immunity, and industrial temperature operation are essential.
FAQ
What is the operating temperature range for SN74ABT244ADBR?
The SN74ABT244ADBR is specified for industrial operation from −40°C to +85°C. This range is confirmed in the "recommended operating conditions" table of the official SCBS099J datasheet and applies specifically to the DB-package variants including SN74ABT244ADBR. It is not rated for extended military or automotive temperature ranges.
Does SN74ABT244ADBR support true 3-state outputs?
Yes, SN74ABT244ADBR provides true 3-state (high-impedance) outputs controlled by its active-low OE inputs. When OE is high, both Y-output groups enter high-Z mode with leakage current ≤ ±10 µA (IOZH/IOZL) and off-state supply current ≤ 250 µA - verified in the "electrical characteristics" section of the SCBS099J datasheet.
What is the maximum output current capability of SN74ABT244ADBR?
SN74ABT244ADBR delivers −32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) at VCC = 4.5 V, per the "recommended operating conditions" table. These values are measured under defined test conditions and represent guaranteed minimum drive strength for robust bus loading.
Is SN74ABT244ADBR RoHS compliant and lead-free?
Yes, SN74ABT244ADBR is RoHS compliant and lead-free, with "Green (RoHS & no Sb/Br)" eco plan and "CU NIPDAU" lead finish. This is documented in TI's Packaging Information tables, confirming compliance with EU RoHS Directive 2011/65/EU and absence of bromine/antimony flame retardants.
How does SN74ABT244ADBR differ from SN74ABT244A?
SN74ABT244ADBR is a specific packaging variant of SN74ABT244A - it uses the SSOP-DB package (20-pin, 0.65 mm pitch), whereas SN74ABT244A is the generic part number covering multiple packages (DB, DW, PW, NS, N). All electrical specs, timing, and functionality are identical across these variants per TI's datasheet revision history.
SN74ABT244ADBR 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:
- 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
SN74ABT244ADBR FAQ
1.How can I place an order for SN74ABT244ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT244ADBR 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 SN74ABT244ADBR reliable?
The price and inventory of SN74ABT244ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT244ADBR is usually 5 days.
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SN74ABT244ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT244ADBR 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 SN74ABT244ADBR?
For technical support, including SN74ABT244ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT244ADBR requirements.
6.How does Aetrix verify that SN74ABT244ADBR is sourced from the original manufacturer or authorized distributors?
All SN74ABT244ADBR 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 SN74ABT244ADBR meets industry standards.
7.What is the process for return or replacement of SN74ABT244ADBR?
All SN74ABT244ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT244ADBR, 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 SN74ABT244ADBR part is unused and in its original packaging.
Return procedure for SN74ABT244ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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