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Texas Instruments SN74ABT2244ADBR
- Part No.:
- SN74ABT2244ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT2244ADBR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,053
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Product details
Overview
SN74ABT2244ADBR 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, sinks up to 12 mA per output, and integrates 25-Ω series output resistors to suppress overshoot/undershoot in high-speed digital systems.
For engineers reviewing the SN74ABT2244ADBR datasheet, SN74ABT2244ADBR pinout, SN74ABT2244ADBR application, or SN74ABT2244ADBR equivalent, key selection criteria include its 20-pin SSOP (DB) package, dual 4-bit 3-state enable control (1OE/2OE), low ground bounce (<1 V typical VOLP), and compatibility with TTL-level inputs in 5-V systems.
Technical Context
This device implements two independent 4-bit noninverting buffer sections, each with dedicated active-low 3-state enable inputs (1OE and 2OE). Its EPIC-IIB BiCMOS process enables high fan-out while reducing power dissipation versus standard bipolar TTL.
The outputs feature built-in 25-Ω series termination, eliminating external resistors for impedance matching on PCB traces. During power-up/down (VCC between 0–2.1 V), outputs enter high-impedance state automatically-no external pull-up on OE required for safe initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial 5-V rail tolerances. |
| Output Sink Current | 12 mA per Y output - Sufficient to drive standard TTL loads and short PCB traces without buffering. |
| tPLH / tPHL | 1 ns to 4.7 ns (typ) - Enables reliable operation at >100 MHz data rates in point-to-point or lightly loaded buses. |
| IOZL / IOZH | ±10 µA max - Guarantees minimal leakage in 3-state mode, critical for bus contention avoidance. |
| VOLP (Ground Bounce) | <1 V typical at VCC = 5 V - Reduces noise coupling into adjacent signals and power rails during switching. |
| ESD Rating | >2000 V HBM - Meets MIL-STD-883 Class 3015, supporting robust handling in manufacturing and field environments. |
| Latch-Up Immunity | >500 mA per JEDEC JESD-17 - Prevents destructive latch-up under transient overvoltage or ESD events. |
Pinout & Package
SN74ABT2244ADBR uses a 20-pin Shrink Small-Outline Package (SSOP-DB), 7.4 mm × 5.3 mm body, 0.65 mm lead pitch, 2.0 mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low 3-state enable inputs | Independent control of first and second 4-bit buffer groups; OE ≥ 2 V disables outputs to high-Z. |
| 1A1–1A4, 2A1–2A4 | Noninverting input terminals | Eight logic inputs accepting TTL-compatible thresholds (VIH = 2 V, VIL = 0.8 V). |
| 1Y1–1Y4, 2Y1–2Y4 | Noninverting 3-state outputs | Eight buffered outputs with integrated 25-Ω series resistance - no external termination needed. |
| GND (Pin 10), VCC (Pin 11) | Power supply connections | Dedicated single GND/VCC pair minimizes supply noise coupling; decoupling recommended near Pin 10/11. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω output series resistors | Eliminates need for eight discrete 25-Ω resistors - reduces BOM count, layout area, and signal integrity risk. |
| Automatic high-impedance on power ramp | Outputs remain safely disabled when VCC is below 2.1 V - prevents bus contention during cold start or brownout. |
| Low ground bounce (VOLP < 1 V) | Minimizes simultaneous switching noise that could corrupt adjacent data lines or clock edges in dense layouts. |
| EPIC-IIB BiCMOS process | Combines bipolar speed with CMOS low static power - ICC disabled < 250 µA, enabling low-quiescent designs. |
| TTL-compatible input thresholds | VIH = 2 V / VIL = 0.8 V ensures interoperability with legacy 5-V microcontrollers, FPGAs, and ASICs. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit address bus from a microcontroller to multiple SRAM or Flash devices in a shared-memory architecture. IC Role / Device Role / Timing Role: Noninverting octal buffer providing level translation, fan-out expansion, and controlled 3-state isolation between master and slave devices. Use Value: Integrated 25-Ω output resistors suppress reflections on parallel address traces, improving setup/hold timing margins at 20+ MHz clock rates. |
Use Scenario: Bidirectional data bus isolation between a DSP and peripheral ICs (e.g., ADC, DAC, EEPROM) sharing a common 8-bit data path. IC Role / Device Role / Timing Role: Dual 4-bit buffer section used as unidirectional transmitter with independent OE control per group, preventing bus contention. Use Value: Automatic high-Z during power sequencing eliminates need for external power-good monitoring or reset-synchronized OE control. |
| Clock Distribution Network | Legacy System Bus Expansion |
Use Scenario: Distributing a system clock or strobe signal to four synchronous peripherals requiring matched skew and low jitter. IC Role / Device Role / Timing Role: Low-skew noninverting buffer with matched propagation delays (tPLH/tPHL ≤ 4.7 ns typ) across all eight outputs. Use Value: Tight delay matching (≤0.6 ns variation) maintains inter-channel skew below 1% of 20-MHz period, preserving timing integrity. |
Use Scenario: Adding ISA or PC/104-compatible I/O expansion to modern embedded controllers using 5-V tolerant logic interfaces. IC Role / Device Role / Timing Role: Octal line driver translating 3.3-V FPGA outputs to full 5-V TTL levels while driving capacitive bus loads up to 50 pF. Use Value: 12-mA sink capability ensures reliable low-level assertion across long backplane traces with multiple stubs. |
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 |
|---|---|---|---|
| SN74ABT2240ADBR | Inverting outputs (vs. noninverting in SN74ABT2244ADBR); identical pinout, specs, and package. | Requires logic inversion in upstream signal path; unsuitable where polarity must be preserved (e.g., address mirroring). | Select when system-level logic already accounts for inversion or when complementary buffering is needed alongside SN74ABT2244ADBR. |
| SN74LVC244APWR | 3.3-V only operation (1.65–3.6 V), lower drive (24 mA sink), different pinout (TSSOP-20 PW vs. DB), no integrated series resistors. | Not pin-compatible; requires redesign of termination, power, and level-shifting for 5-V systems. | Choose only for new 3.3-V designs prioritizing lower power and smaller footprint - not a drop-in replacement. |
Compared with SN74ABT2244ADBR, SN74ABT2240ADBR offers identical form-factor and electrical behavior except output polarity, making it a direct functional alternative where inversion is acceptable; SN74LVC244APWR targets modern low-voltage systems but demands full schematic and layout revision due to voltage, pinout, and termination differences.
Availability
SN74ABT2244ADBR is available at Aetrix Electronics and suitable for memory subsystems, industrial bus interfaces, clock distribution networks, and legacy 5-V embedded control systems requiring stable component supply and long-term manufacturability.
Supply support for SN74ABT2244ADBR 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 5-V logic families.
The SN74ABT2244ADBR belongs to TI's ABT-series advanced biCMOS logic line, engineered for high-speed, low-noise 5-V bus interfacing in industrial, computing, and communications equipment.
FAQ
What is the operating temperature range for SN74ABT2244ADBR?
The SN74ABT2244ADBR is characterized for industrial operation from –40°C to +85°C. This range is validated per the datasheet's recommended operating conditions and applies specifically to the DB-package variant (SN74ABT2244ADBR), not the military-grade SN54ABT2244A.
Does SN74ABT2244ADBR require external pull-up resistors on its OE pins?
SN74ABT2244ADBR does not require external pull-ups on 1OE or 2OE for safe power-up behavior: outputs enter high-impedance when VCC is below 2.1 V. However, to guarantee high-Z above 2.1 V, OE must be actively driven or pulled to VCC - minimum resistor value depends on driver sink capability.
Is SN74ABT2244ADBR pin-compatible with SN74ABT2244ADW?
Yes - SN74ABT2244ADBR (SSOP-DB) and SN74ABT2244ADW (SOIC-DW) share identical 20-pin functional pinout and logic behavior. Mechanical dimensions and soldering profiles differ, but PCB layout can reuse the same netlist and signal routing; only footprint and stencil must be updated.
What is the maximum capacitive load SN74ABT2244ADBR can drive reliably?
SN74ABT2244ADBR switching characteristics are specified with CL = 50 pF. While it can drive higher capacitance, propagation delay increases linearly beyond this point; for loads >70 pF, verify timing margins using the measured tPLH/tPHL vs. CL curves in the datasheet's Figure 1.
How does the integrated 25-Ω series resistor in SN74ABT2244ADBR improve signal integrity?
The 25-Ω series resistor in each SN74ABT2244ADBR output matches typical PCB trace impedance (50–75 Ω) in source-series termination configurations, reducing edge overshoot/undershoot by damping reflections - eliminating need for eight discrete resistors and associated layout complexity.
SN74ABT2244ADBR 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, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74ABT2244ADBR FAQ
1.How can I place an order for SN74ABT2244ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2244ADBR 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 SN74ABT2244ADBR reliable?
The price and inventory of SN74ABT2244ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2244ADBR is usually 5 days.
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SN74ABT2244ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT2244ADBR 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 SN74ABT2244ADBR?
For technical support, including SN74ABT2244ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2244ADBR requirements.
6.How does Aetrix verify that SN74ABT2244ADBR is sourced from the original manufacturer or authorized distributors?
All SN74ABT2244ADBR 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 SN74ABT2244ADBR meets industry standards.
7.What is the process for return or replacement of SN74ABT2244ADBR?
All SN74ABT2244ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2244ADBR, 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 SN74ABT2244ADBR part is unused and in its original packaging.
Return procedure for SN74ABT2244ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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